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* [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3
@ 2016-04-06 11:19 Mel Gorman
  2016-04-06 11:20 ` [PATCH 01/27] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone) Mel Gorman
                   ` (20 more replies)
  0 siblings, 21 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:19 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

This is the latest version of a series that moves LRUs from the zones
to the node that is based upon 4.6-rc1. Conceptually, this is simple but
there are a lot of details. Some of the broad motivations for this are;

1. The residency of a page partially depends on what zone the page was
   allocated from.  This is partially combatted by the fair zone allocation
   policy but that is a partial solution that introduces overhead in the
   page allocator paths.

2. Currently, reclaim on node 0 behaves slightly different to node 1. For
   example, direct reclaim scans in zonelist order and reclaims even if
   the zone is over the high watermark regardless of the age of pages
   in that LRU. Kswapd on the other hand starts reclaim on the highest
   unbalanced zone. A difference in distribution of file/anon pages due
   to when they were allocated results can result in a difference in 
   again. While the fair zone allocation policy mitigates some of the
   problems here, the page reclaim results on a multi-zone node will
   always be different to a single-zone node.
   it was scheduled on as a result.

3. kswapd and the page allocator scan zones in the opposite order to
   avoid interfering with each other but it's sensitive to timing.  This
   mitigates the page allocator using pages that were allocated very recently
   in the ideal case but it's sensitive to timing. When kswapd is allocating
   from lower zones then it's great but during the rebalancing of the highest
   zone, the page allocator and kswapd interfere with each other. It's worse
   if the highest zone is small and difficult to balance.

4. slab shrinkers are node-based which makes it harder to identify the exact
   relationship between slab reclaim and LRU reclaim.

The reason we have zone-based reclaim is that we used to have
large highmem zones in common configurations and it was necessary
to quickly find ZONE_NORMAL pages for reclaim. Today, this is much
less of a concern as machines with lots of memory will (or should) use
64-bit kernels. Combinations of 32-bit hardware and 64-bit hardware are
rare. Machines that do use highmem should have relatively low highmem:lowmem
ratios than we worried about in the past.

Conceptually, moving to node LRUs should be easier to understand. The
page allocator plays fewer tricks to game reclaim and reclaim behaves
similarly on all nodes. 

It was tested on a UMA (16 cores single socket) and a NUMA machine (48
cores, 2 sockets). In most cases, only the UMA results are presented as
the NUMA machine takes an excessive amount of time to complete tests.

There may be an obvious difference in the number of
allocations from each zone as the fair zone allocation policy is removed
towards the end of the series. In cases where the working set exceeds memory,
the differences will be small but on small workloads it'll be very obvious.
For example, these are the allocation stats on a workload that is doing small
amounts of dd.

                             4.6.0-rc1   4.6.0-rc1
                               vanilla  nodelru-v3
DMA allocs                           0           0
DMA32 allocs                   1961196           0
Normal allocs                  3355799     5247180
Movable allocs                       0           0

The key reason why this is not a problem is that kswapd will sleep if any
applicable zone for a classzone is free. If it tried to balance all zones
then there would be excessive reclaim.

bonnie
------

This was configured to do an IO test with a working set 2*RAM using the
ext4 filesystem.  For both machines, there was no significant performance
difference between them but this is the result for the UMA machine

bonnie
bonnie
                                           4.6.0-rc1                   4.6.0-rc1
                                             vanilla               nodelru-v3r10
Hmean    SeqOut Char            53306.32 (  0.00%)        79027.86 ( 48.25%)
Hmean    SeqOut Block           87796.15 (  0.00%)        87881.69 (  0.10%)
Hmean    SeqOut Rewrite         35996.31 (  0.00%)        36355.59 (  1.00%)
Hmean    SeqIn  Char            38789.17 (  0.00%)        76356.20 ( 96.85%)
Hmean    SeqIn  Block          105315.39 (  0.00%)       105514.07 (  0.19%)
Hmean    Random seeks             329.80 (  0.00%)          334.36 (  1.38%)
Hmean    SeqCreate ops              4.62 (  0.00%)            4.62 (  0.00%)
Hmean    SeqCreate read             4.62 (  0.00%)            4.62 (  0.00%)
Hmean    SeqCreate del            599.29 (  0.00%)         1580.23 (163.68%)
Hmean    RandCreate ops             5.00 (  0.00%)            5.00 (  0.00%)
Hmean    RandCreate read            5.00 (  0.00%)            4.62 ( -7.69%)
Hmean    RandCreate del           629.51 (  0.00%)         1634.55 (159.66%)

           4.6.0-rc1   4.6.0-rc1
             vanillanodelru-v3r10
User         2049.02     1078.82
System        294.25      181.00
Elapsed      6960.58     6021.58

Note that the massive gains shown here are possible an anomaly. It has been noted
that in some cases, bonnie gets an artifical boost due to dumb reclaim luck. There
is no guarantee this result would be reproducible on the same machine let alone
any other machine. That said, the VM stats are interesting;

However, the overall VM stats are interesting


                             4.5.0-rc3   4.5.0-rc3
                          mmotm-20160209   nodelru-v2
Swap Ins                            14           0
Swap Outs                          873           0
DMA allocs                           0           0
DMA32 allocs                  38259888    36320496
Normal allocs                 64762073    66488556
Movable allocs                       0           0
Allocation stalls                 3584           0
Direct pages scanned            736769           0
Kswapd pages scanned          77818637    78836064
Kswapd pages reclaimed        77782378    78812260
Direct pages reclaimed          736548           0
Kswapd efficiency                  99%         99%
Kswapd velocity              11179.907   13092.256
Direct efficiency                  99%        100%
Direct velocity                105.849       0.000

The series does not swap the workload and it never stalls on direct reclaim. There
is a slight increase in kswapd scans but it's offset by the elimination of direct
scans and the overall scanning velocity is not noticably higher. While it's not
reported here, the overall IO stats and CPU usage over time are very similar. kswapd
CPU usage is slightly elevated but (0.5% usage to roughly 1.2% usage over time) but
that is acceptable given the lack of direct reclaim.

tiobench
--------

tiobench is a flawed benchmark but it's very important in this case. tiobench
benefited from a bug prior to the fair zone allocation policy that allowed
old pages to be artificially preserved. The visible impact was that performance
exceeded the physical capabilities of the disk. With this patch applied the results are

tiobench Throughput
tiobench Throughput
                                         4.6.0-rc1             4.6.0-rc1
                                           vanilla            nodelru-v3
Hmean    PotentialReadSpeed        85.84 (  0.00%)       86.20 (  0.42%)
Hmean    SeqRead-MB/sec-1          84.48 (  0.00%)       84.60 (  0.14%)
Hmean    SeqRead-MB/sec-2          75.69 (  0.00%)       75.44 ( -0.34%)
Hmean    SeqRead-MB/sec-4          77.35 (  0.00%)       77.62 (  0.35%)
Hmean    SeqRead-MB/sec-8          68.29 (  0.00%)       68.58 (  0.43%)
Hmean    SeqRead-MB/sec-16         62.82 (  0.00%)       62.72 ( -0.15%)
Hmean    RandRead-MB/sec-1          0.93 (  0.00%)        0.88 ( -4.69%)
Hmean    RandRead-MB/sec-2          1.11 (  0.00%)        1.08 ( -3.20%)
Hmean    RandRead-MB/sec-4          1.52 (  0.00%)        1.48 ( -2.86%)
Hmean    RandRead-MB/sec-8          1.70 (  0.00%)        1.70 ( -0.26%)
Hmean    RandRead-MB/sec-16         1.96 (  0.00%)        1.91 ( -2.49%)
Hmean    SeqWrite-MB/sec-1         83.01 (  0.00%)       83.07 (  0.07%)
Hmean    SeqWrite-MB/sec-2         77.80 (  0.00%)       78.20 (  0.52%)
Hmean    SeqWrite-MB/sec-4         81.68 (  0.00%)       81.72 (  0.05%)
Hmean    SeqWrite-MB/sec-8         78.17 (  0.00%)       78.41 (  0.31%)
Hmean    SeqWrite-MB/sec-16        80.08 (  0.00%)       80.08 (  0.01%)
Hmean    RandWrite-MB/sec-1         1.17 (  0.00%)        1.17 ( -0.03%)
Hmean    RandWrite-MB/sec-2         1.02 (  0.00%)        1.06 (  4.21%)
Hmean    RandWrite-MB/sec-4         1.02 (  0.00%)        1.04 (  2.32%)
Hmean    RandWrite-MB/sec-8         0.95 (  0.00%)        0.97 (  1.75%)
Hmean    RandWrite-MB/sec-16        0.95 (  0.00%)        0.96 (  0.97%)

Note that the performance is almost identical allowing us to conclude that
the correct reclaim behaviour granted by the fair zone allocation policy
is preserved.

stutter
-------

stutter simulates a simple workload. One part uses a lot of anonymous
memory, a second measures mmap latency and a third copies a large file.
The primary metric is checking for mmap latency.

stutter
                             4.6.0-rc1             4.6.0-rc1
                               vanilla            nodelru-v3
Min         mmap     13.4442 (  0.00%)     13.6705 ( -1.68%)
1st-qrtle   mmap     38.0442 (  0.00%)     37.7842 (  0.68%)
2nd-qrtle   mmap     78.5109 (  0.00%)     40.3648 ( 48.59%)
3rd-qrtle   mmap     86.7806 (  0.00%)     46.2499 ( 46.70%)
Max-90%     mmap     89.7028 (  0.00%)     86.5790 (  3.48%)
Max-93%     mmap     90.6776 (  0.00%)     89.5367 (  1.26%)
Max-95%     mmap     91.1678 (  0.00%)     90.3138 (  0.94%)
Max-99%     mmap     92.0036 (  0.00%)     93.2003 ( -1.30%)
Max         mmap    167.0073 (  0.00%)     94.5935 ( 43.36%)
Mean        mmap     68.7672 (  0.00%)     48.9853 ( 28.77%)
Best99%Mean mmap     68.5246 (  0.00%)     48.5354 ( 29.17%)
Best95%Mean mmap     67.5540 (  0.00%)     46.7102 ( 30.86%)
Best90%Mean mmap     66.2798 (  0.00%)     44.3547 ( 33.08%)
Best50%Mean mmap     50.7730 (  0.00%)     37.1298 ( 26.87%)
Best10%Mean mmap     35.8311 (  0.00%)     33.6910 (  5.97%)
Best5%Mean  mmap     34.0159 (  0.00%)     31.4259 (  7.61%)
Best1%Mean  mmap     22.1306 (  0.00%)     24.8851 (-12.45%)

           4.6.0-rc1   4.6.0-rc1
             vanillanodelru-v3r10
User            1.51        0.97
System        138.03      122.58
Elapsed      2420.90     2394.80

The VM stats in this case were not that intresting and are very roughly comparable.

Page allocator intensive workloads showed few differences as the cost
of the fair zone allocation policy does not dominate from a userspace
perspective but a microbench of just the allocator shows a difference

                                           4.6.0-rc1                   4.6.0-rc1
                                             vanilla                 nodelru-v3
Min      total-odr0-1               725.00 (  0.00%)           697.00 (  3.86%)
Min      total-odr0-2               559.00 (  0.00%)           527.00 (  5.72%)
Min      total-odr0-4               459.00 (  0.00%)           436.00 (  5.01%)
Min      total-odr0-8               403.00 (  0.00%)           391.00 (  2.98%)
Min      total-odr0-16              329.00 (  0.00%)           366.00 (-11.25%)
Min      total-odr0-32              365.00 (  0.00%)           355.00 (  2.74%)
Min      total-odr0-64              297.00 (  0.00%)           348.00 (-17.17%)
Min      total-odr0-128             752.00 (  0.00%)           344.00 ( 54.26%)
Min      total-odr0-256             385.00 (  0.00%)           379.00 (  1.56%)
Min      total-odr0-512             899.00 (  0.00%)           414.00 ( 53.95%)
Min      total-odr0-1024            763.00 (  0.00%)           530.00 ( 30.54%)
Min      total-odr0-2048            982.00 (  0.00%)           469.00 ( 52.24%)
Min      total-odr0-4096            928.00 (  0.00%)           526.00 ( 43.32%)
Min      total-odr0-8192           1007.00 (  0.00%)           768.00 ( 23.73%)
Min      total-odr0-16384           375.00 (  0.00%)           366.00 (  2.40%)

This series is not without its hazards. There are at least three areas
that I'm concerned with even though I could not reproduce any problems in
that area.

1. Reclaim/compaction is going to be affected because the amount of reclaim is
   no longer targetted at a specific zone. Compaction works on a per-zone basis
   so there is no guarantee that reclaiming a few THP's worth page pages will
   have a positive impact on compaction success rates.

2. The Slab/LRU reclaim ratio is affected because the frequency the shrinkers
   are called is now different. This may or may not be a problem but if it
   is, it'll be because shrinkers are not called enough and some balancing
   is required.

3. The anon/file reclaim ratio may be affected. Pages about to be dirtied are
   distributed between zones and the fair zone allocation policy used to do
   something very similar for anon. The distribution is now different but not
   necessarily in any way that matters but it's still worth bearing in mind.

 Documentation/cgroup-v1/memcg_test.txt    |   4 +-
 Documentation/cgroup-v1/memory.txt        |   4 +-
 arch/s390/appldata/appldata_mem.c         |   2 +-
 arch/tile/mm/pgtable.c                    |  18 +-
 drivers/base/node.c                       |  73 +--
 drivers/staging/android/lowmemorykiller.c |  12 +-
 fs/fs-writeback.c                         |   4 +-
 fs/fuse/file.c                            |   8 +-
 fs/nfs/internal.h                         |   2 +-
 fs/nfs/write.c                            |   2 +-
 fs/proc/meminfo.c                         |  14 +-
 include/linux/backing-dev.h               |   2 +-
 include/linux/memcontrol.h                |  30 +-
 include/linux/mm_inline.h                 |   4 +-
 include/linux/mm_types.h                  |   2 +-
 include/linux/mmzone.h                    | 156 +++---
 include/linux/swap.h                      |  13 +-
 include/linux/topology.h                  |   2 +-
 include/linux/vm_event_item.h             |  14 +-
 include/linux/vmstat.h                    | 112 +++-
 include/linux/writeback.h                 |   2 +-
 include/trace/events/vmscan.h             |  40 +-
 include/trace/events/writeback.h          |  10 +-
 kernel/power/snapshot.c                   |  10 +-
 kernel/sysctl.c                           |   4 +-
 mm/backing-dev.c                          |  14 +-
 mm/compaction.c                           |  24 +-
 mm/filemap.c                              |  14 +-
 mm/huge_memory.c                          |  14 +-
 mm/internal.h                             |  11 +-
 mm/memcontrol.c                           | 235 ++++-----
 mm/memory-failure.c                       |   4 +-
 mm/memory_hotplug.c                       |   7 +-
 mm/mempolicy.c                            |   2 +-
 mm/migrate.c                              |  35 +-
 mm/mlock.c                                |  12 +-
 mm/page-writeback.c                       | 119 ++---
 mm/page_alloc.c                           | 293 +++++------
 mm/page_idle.c                            |   4 +-
 mm/rmap.c                                 |  15 +-
 mm/shmem.c                                |  12 +-
 mm/swap.c                                 |  66 +--
 mm/swap_state.c                           |   4 +-
 mm/util.c                                 |   4 +-
 mm/vmscan.c                               | 838 ++++++++++++++----------------
 mm/vmstat.c                               | 367 ++++++++++---
 mm/workingset.c                           |  53 +-
 47 files changed, 1473 insertions(+), 1218 deletions(-)

-- 
2.6.4

^ permalink raw reply	[flat|nested] 30+ messages in thread

* [PATCH 01/27] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone)
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 02/27] mm, vmstat: Add infrastructure for per-node vmstats Mel Gorman
                   ` (19 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

ac->classzone_idx is determined by the index of the preferred zone and cached
to avoid repeated calculations. wake_all_kswapds() should use it instead of
using zone_idx() within a loop.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 59de90d5d3a3..2643d10dee98 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3049,7 +3049,7 @@ static void wake_all_kswapds(unsigned int order, const struct alloc_context *ac)
 
 	for_each_zone_zonelist_nodemask(zone, z, ac->zonelist,
 						ac->high_zoneidx, ac->nodemask)
-		wakeup_kswapd(zone, order, zone_idx(ac->preferred_zone));
+		wakeup_kswapd(zone, order, ac->classzone_idx);
 }
 
 static inline int
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 02/27] mm, vmstat: Add infrastructure for per-node vmstats
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
  2016-04-06 11:20 ` [PATCH 01/27] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone) Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 03/27] mm, vmscan: Move lru_lock to the node Mel Gorman
                   ` (18 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

VM statistic counters for reclaim decisions are zone-based. If the kernel
is to reclaim on a per-node basis then we need to track per-node statistics
but there is no infrastructure for that. The most notable change is that
the old node_page_state is renamed to sum_zone_node_page_state.  The new
node_page_state takes a pglist_data and uses per-node stats but none exist
yet. There is some renaming such as vm_stat to vm_zone_stat and the addition
of vm_node_stat and the renaming of mod_state to mod_zone_state. Otherwise,
this is mostly a mechanical patch with no functional change. There is a
lot of similarity between the node and zone helpers which is unfortunate
but there was no obvious way of reusing the code and maintaining type safety.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 drivers/base/node.c    |  72 +++++++------
 include/linux/mmzone.h |  13 +++
 include/linux/vmstat.h |  89 ++++++++++++++--
 mm/page_alloc.c        |  10 +-
 mm/vmstat.c            | 278 +++++++++++++++++++++++++++++++++++++++++++++----
 mm/workingset.c        |   9 +-
 6 files changed, 401 insertions(+), 70 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 560751bad294..efb81da250a8 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -74,16 +74,16 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(i.totalram),
 		       nid, K(i.freeram),
 		       nid, K(i.totalram - i.freeram),
-		       nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
-				node_page_state(nid, NR_ACTIVE_FILE)),
-		       nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
-				node_page_state(nid, NR_INACTIVE_FILE)),
-		       nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
-		       nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
-		       nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
-		       nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
-		       nid, K(node_page_state(nid, NR_UNEVICTABLE)),
-		       nid, K(node_page_state(nid, NR_MLOCK)));
+		       nid, K(sum_zone_node_page_state(nid, NR_ACTIVE_ANON) +
+				sum_zone_node_page_state(nid, NR_ACTIVE_FILE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_INACTIVE_ANON) +
+				sum_zone_node_page_state(nid, NR_INACTIVE_FILE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_ACTIVE_ANON)),
+		       nid, K(sum_zone_node_page_state(nid, NR_INACTIVE_ANON)),
+		       nid, K(sum_zone_node_page_state(nid, NR_ACTIVE_FILE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_INACTIVE_FILE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_UNEVICTABLE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
 
 #ifdef CONFIG_HIGHMEM
 	n += sprintf(buf + n,
@@ -115,28 +115,28 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       "Node %d AnonHugePages:  %8lu kB\n"
 #endif
 			,
-		       nid, K(node_page_state(nid, NR_FILE_DIRTY)),
-		       nid, K(node_page_state(nid, NR_WRITEBACK)),
-		       nid, K(node_page_state(nid, NR_FILE_PAGES)),
-		       nid, K(node_page_state(nid, NR_FILE_MAPPED)),
-		       nid, K(node_page_state(nid, NR_ANON_PAGES)),
+		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
+		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
+		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
+		       nid, K(sum_zone_node_page_state(nid, NR_FILE_MAPPED)),
+		       nid, K(sum_zone_node_page_state(nid, NR_ANON_PAGES)),
 		       nid, K(i.sharedram),
-		       nid, node_page_state(nid, NR_KERNEL_STACK) *
+		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
-		       nid, K(node_page_state(nid, NR_PAGETABLE)),
-		       nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
-		       nid, K(node_page_state(nid, NR_BOUNCE)),
-		       nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
-		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
-				node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
-		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_UNSTABLE_NFS)),
+		       nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK_TEMP)),
+		       nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE) +
+				sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
+		       nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE)),
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-		       nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
+		       nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE))
 			, nid,
-			K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
+			K(sum_zone_node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
 			HPAGE_PMD_NR));
 #else
-		       nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
+		       nid, K(sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
 #endif
 	n += hugetlb_report_node_meminfo(nid, buf + n);
 	return n;
@@ -155,12 +155,12 @@ static ssize_t node_read_numastat(struct device *dev,
 		       "interleave_hit %lu\n"
 		       "local_node %lu\n"
 		       "other_node %lu\n",
-		       node_page_state(dev->id, NUMA_HIT),
-		       node_page_state(dev->id, NUMA_MISS),
-		       node_page_state(dev->id, NUMA_FOREIGN),
-		       node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
-		       node_page_state(dev->id, NUMA_LOCAL),
-		       node_page_state(dev->id, NUMA_OTHER));
+		       sum_zone_node_page_state(dev->id, NUMA_HIT),
+		       sum_zone_node_page_state(dev->id, NUMA_MISS),
+		       sum_zone_node_page_state(dev->id, NUMA_FOREIGN),
+		       sum_zone_node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
+		       sum_zone_node_page_state(dev->id, NUMA_LOCAL),
+		       sum_zone_node_page_state(dev->id, NUMA_OTHER));
 }
 static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
 
@@ -168,12 +168,18 @@ static ssize_t node_read_vmstat(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	int nid = dev->id;
+	struct pglist_data *pgdat = NODE_DATA(nid);
 	int i;
 	int n = 0;
 
 	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
 		n += sprintf(buf+n, "%s %lu\n", vmstat_text[i],
-			     node_page_state(nid, i));
+			     sum_zone_node_page_state(nid, i));
+
+	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+		n += sprintf(buf+n, "%s %lu\n",
+			     vmstat_text[i + NR_VM_ZONE_STAT_ITEMS],
+			     node_page_state(pgdat, i));
 
 	return n;
 }
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index c60df9257cc7..ed62672375bf 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -162,6 +162,10 @@ enum zone_stat_item {
 	NR_FREE_CMA_PAGES,
 	NR_VM_ZONE_STAT_ITEMS };
 
+enum node_stat_item {
+	NR_VM_NODE_STAT_ITEMS
+};
+
 /*
  * We do arithmetic on the LRU lists in various places in the code,
  * so it is important to keep the active lists LRU_ACTIVE higher in
@@ -269,6 +273,11 @@ struct per_cpu_pageset {
 #endif
 };
 
+struct per_cpu_nodestat {
+	s8 stat_threshold;
+	s8 vm_node_stat_diff[NR_VM_NODE_STAT_ITEMS];
+};
+
 #endif /* !__GENERATING_BOUNDS.H */
 
 enum zone_type {
@@ -698,6 +707,10 @@ typedef struct pglist_data {
 	struct list_head split_queue;
 	unsigned long split_queue_len;
 #endif
+
+	/* Per-node vmstats */
+	struct per_cpu_nodestat __percpu *per_cpu_nodestats;
+	atomic_long_t		vm_stat[NR_VM_NODE_STAT_ITEMS];
 } pg_data_t;
 
 #define node_present_pages(nid)	(NODE_DATA(nid)->node_present_pages)
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 73fae8c4a5fb..533680126b21 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -106,20 +106,38 @@ static inline void vm_events_fold_cpu(int cpu)
 		zone_idx(zone), delta)
 
 /*
- * Zone based page accounting with per cpu differentials.
+ * Zone and node-based page accounting with per cpu differentials.
  */
-extern atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
+extern atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS];
+extern atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS];
 
 static inline void zone_page_state_add(long x, struct zone *zone,
 				 enum zone_stat_item item)
 {
 	atomic_long_add(x, &zone->vm_stat[item]);
-	atomic_long_add(x, &vm_stat[item]);
+	atomic_long_add(x, &vm_zone_stat[item]);
+}
+
+static inline void node_page_state_add(long x, struct pglist_data *pgdat,
+				 enum node_stat_item item)
+{
+	atomic_long_add(x, &pgdat->vm_stat[item]);
+	atomic_long_add(x, &vm_node_stat[item]);
 }
 
 static inline unsigned long global_page_state(enum zone_stat_item item)
 {
-	long x = atomic_long_read(&vm_stat[item]);
+	long x = atomic_long_read(&vm_zone_stat[item]);
+#ifdef CONFIG_SMP
+	if (x < 0)
+		x = 0;
+#endif
+	return x;
+}
+
+static inline unsigned long global_node_page_state(enum node_stat_item item)
+{
+	long x = atomic_long_read(&vm_node_stat[item]);
 #ifdef CONFIG_SMP
 	if (x < 0)
 		x = 0;
@@ -161,33 +179,49 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 }
 
 #ifdef CONFIG_NUMA
-
-extern unsigned long node_page_state(int node, enum zone_stat_item item);
+extern unsigned long sum_zone_node_page_state(int node,
+						enum zone_stat_item item);
+extern unsigned long node_page_state(struct pglist_data *pgdat,
+						enum node_stat_item item);
 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
 
 #else
 
-#define node_page_state(node, item) global_page_state(item)
+#define sum_zone_node_page_state(node, item) global_node_page_state(item)
+#define node_page_state(node, item) global_node_page_state(item)
 #define zone_statistics(_zl, _z, gfp) do { } while (0)
 
 #endif /* CONFIG_NUMA */
 
 #define add_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, __d)
 #define sub_zone_page_state(__z, __i, __d) mod_zone_page_state(__z, __i, -(__d))
+#define add_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, __d)
+#define sub_node_page_state(__p, __i, __d) mod_node_page_state(__p, __i, -(__d))
 
 #ifdef CONFIG_SMP
 void __mod_zone_page_state(struct zone *, enum zone_stat_item item, long);
 void __inc_zone_page_state(struct page *, enum zone_stat_item);
 void __dec_zone_page_state(struct page *, enum zone_stat_item);
 
+void __mod_node_page_state(struct pglist_data *, enum node_stat_item item, long);
+void __inc_node_page_state(struct page *, enum node_stat_item);
+void __dec_node_page_state(struct page *, enum node_stat_item);
+
 void mod_zone_page_state(struct zone *, enum zone_stat_item, long);
 void inc_zone_page_state(struct page *, enum zone_stat_item);
 void dec_zone_page_state(struct page *, enum zone_stat_item);
 
+void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
+void inc_node_page_state(struct page *, enum node_stat_item);
+void dec_node_page_state(struct page *, enum node_stat_item);
+
 extern void inc_zone_state(struct zone *, enum zone_stat_item);
+extern void inc_node_state(struct pglist_data *, enum node_stat_item);
 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
+extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
 extern void dec_zone_state(struct zone *, enum zone_stat_item);
 extern void __dec_zone_state(struct zone *, enum zone_stat_item);
+extern void __dec_node_state(struct pglist_data *, enum node_stat_item);
 
 void quiet_vmstat(void);
 void cpu_vm_stats_fold(int cpu);
@@ -211,16 +245,34 @@ static inline void __mod_zone_page_state(struct zone *zone,
 	zone_page_state_add(delta, zone, item);
 }
 
+static inline void __mod_node_page_state(struct pglist_data *pgdat,
+			enum node_stat_item item, int delta)
+{
+	node_page_state_add(delta, pgdat, item);
+}
+
 static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 {
 	atomic_long_inc(&zone->vm_stat[item]);
-	atomic_long_inc(&vm_stat[item]);
+	atomic_long_inc(&vm_zone_stat[item]);
+}
+
+static inline void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+{
+	atomic_long_inc(&pgdat->vm_stat[item]);
+	atomic_long_inc(&vm_node_stat[item]);
 }
 
 static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 {
 	atomic_long_dec(&zone->vm_stat[item]);
-	atomic_long_dec(&vm_stat[item]);
+	atomic_long_dec(&vm_zone_stat[item]);
+}
+
+static inline void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+{
+	atomic_long_dec(&pgdat->vm_stat[item]);
+	atomic_long_dec(&vm_node_stat[item]);
 }
 
 static inline void __inc_zone_page_state(struct page *page,
@@ -229,12 +281,26 @@ static inline void __inc_zone_page_state(struct page *page,
 	__inc_zone_state(page_zone(page), item);
 }
 
+static inline void __inc_node_page_state(struct page *page,
+			enum node_stat_item item)
+{
+	__inc_node_state(page_zone(page)->zone_pgdat, item);
+}
+
+
 static inline void __dec_zone_page_state(struct page *page,
 			enum zone_stat_item item)
 {
 	__dec_zone_state(page_zone(page), item);
 }
 
+static inline void __dec_node_page_state(struct page *page,
+			enum node_stat_item item)
+{
+	__dec_node_state(page_zone(page)->zone_pgdat, item);
+}
+
+
 /*
  * We only use atomic operations to update counters. So there is no need to
  * disable interrupts.
@@ -243,7 +309,12 @@ static inline void __dec_zone_page_state(struct page *page,
 #define dec_zone_page_state __dec_zone_page_state
 #define mod_zone_page_state __mod_zone_page_state
 
+#define inc_node_page_state __inc_node_page_state
+#define dec_node_page_state __dec_node_page_state
+#define mod_node_page_state __mod_node_page_state
+
 #define inc_zone_state __inc_zone_state
+#define inc_node_state __inc_node_state
 #define dec_zone_state __dec_zone_state
 
 #define set_pgdat_percpu_threshold(pgdat, callback) { }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2643d10dee98..7f9ce45c191b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3795,8 +3795,8 @@ void si_meminfo_node(struct sysinfo *val, int nid)
 	for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
 		managed_pages += pgdat->node_zones[zone_type].managed_pages;
 	val->totalram = managed_pages;
-	val->sharedram = node_page_state(nid, NR_SHMEM);
-	val->freeram = node_page_state(nid, NR_FREE_PAGES);
+	val->sharedram = sum_zone_node_page_state(nid, NR_SHMEM);
+	val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES);
 #ifdef CONFIG_HIGHMEM
 	val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;
 	val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
@@ -4896,6 +4896,11 @@ static void __meminit setup_zone_pageset(struct zone *zone)
 	zone->pageset = alloc_percpu(struct per_cpu_pageset);
 	for_each_possible_cpu(cpu)
 		zone_pageset_init(zone, cpu);
+
+	if (!zone->zone_pgdat->per_cpu_nodestats) {
+		zone->zone_pgdat->per_cpu_nodestats =
+			alloc_percpu(struct per_cpu_nodestat);
+	}
 }
 
 /*
@@ -5599,6 +5604,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 	reset_deferred_meminit(pgdat);
 	pgdat->node_id = nid;
 	pgdat->node_start_pfn = node_start_pfn;
+	pgdat->per_cpu_nodestats = NULL;
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 	pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5e4300482897..0fa8a2dc8170 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -86,8 +86,10 @@ void vm_events_fold_cpu(int cpu)
  *
  * vm_stat contains the global counters
  */
-atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS] __cacheline_aligned_in_smp;
-EXPORT_SYMBOL(vm_stat);
+atomic_long_t vm_zone_stat[NR_VM_ZONE_STAT_ITEMS] __cacheline_aligned_in_smp;
+atomic_long_t vm_node_stat[NR_VM_NODE_STAT_ITEMS] __cacheline_aligned_in_smp;
+EXPORT_SYMBOL(vm_zone_stat);
+EXPORT_SYMBOL(vm_node_stat);
 
 #ifdef CONFIG_SMP
 
@@ -176,9 +178,13 @@ void refresh_zone_stat_thresholds(void)
 
 		threshold = calculate_normal_threshold(zone);
 
-		for_each_online_cpu(cpu)
+		for_each_online_cpu(cpu) {
+			struct pglist_data *pgdat = zone->zone_pgdat;
 			per_cpu_ptr(zone->pageset, cpu)->stat_threshold
 							= threshold;
+			per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->stat_threshold
+							= threshold;
+		}
 
 		/*
 		 * Only set percpu_drift_mark if there is a danger that
@@ -238,6 +244,26 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
 }
 EXPORT_SYMBOL(__mod_zone_page_state);
 
+void __mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
+				long delta)
+{
+	struct per_cpu_nodestat __percpu *pcp = pgdat->per_cpu_nodestats;
+	s8 __percpu *p = pcp->vm_node_stat_diff + item;
+	long x;
+	long t;
+
+	x = delta + __this_cpu_read(*p);
+
+	t = __this_cpu_read(pcp->stat_threshold);
+
+	if (unlikely(x > t || x < -t)) {
+		node_page_state_add(x, pgdat, item);
+		x = 0;
+	}
+	__this_cpu_write(*p, x);
+}
+EXPORT_SYMBOL(__mod_node_page_state);
+
 /*
  * Optimized increment and decrement functions.
  *
@@ -277,12 +303,34 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
 	}
 }
 
+void __inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+{
+	struct per_cpu_nodestat __percpu *pcp = pgdat->per_cpu_nodestats;
+	s8 __percpu *p = pcp->vm_node_stat_diff + item;
+	s8 v, t;
+
+	v = __this_cpu_inc_return(*p);
+	t = __this_cpu_read(pcp->stat_threshold);
+	if (unlikely(v > t)) {
+		s8 overstep = t >> 1;
+
+		node_page_state_add(v + overstep, pgdat, item);
+		__this_cpu_write(*p, -overstep);
+	}
+}
+
 void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
 	__inc_zone_state(page_zone(page), item);
 }
 EXPORT_SYMBOL(__inc_zone_page_state);
 
+void __inc_node_page_state(struct page *page, enum node_stat_item item)
+{
+	__inc_node_state(page_zone(page)->zone_pgdat, item);
+}
+EXPORT_SYMBOL(__inc_node_page_state);
+
 void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 {
 	struct per_cpu_pageset __percpu *pcp = zone->pageset;
@@ -299,12 +347,34 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
 	}
 }
 
+void __dec_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+{
+	struct per_cpu_nodestat __percpu *pcp = pgdat->per_cpu_nodestats;
+	s8 __percpu *p = pcp->vm_node_stat_diff + item;
+	s8 v, t;
+
+	v = __this_cpu_dec_return(*p);
+	t = __this_cpu_read(pcp->stat_threshold);
+	if (unlikely(v < - t)) {
+		s8 overstep = t >> 1;
+
+		node_page_state_add(v - overstep, pgdat, item);
+		__this_cpu_write(*p, overstep);
+	}
+}
+
 void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
 {
 	__dec_zone_state(page_zone(page), item);
 }
 EXPORT_SYMBOL(__dec_zone_page_state);
 
+void __dec_node_page_state(struct page *page, enum node_stat_item item)
+{
+	__dec_node_state(page_zone(page)->zone_pgdat, item);
+}
+EXPORT_SYMBOL(__dec_node_page_state);
+
 #ifdef CONFIG_HAVE_CMPXCHG_LOCAL
 /*
  * If we have cmpxchg_local support then we do not need to incur the overhead
@@ -318,8 +388,8 @@ EXPORT_SYMBOL(__dec_zone_page_state);
  *     1       Overstepping half of threshold
  *     -1      Overstepping minus half of threshold
 */
-static inline void mod_state(struct zone *zone, enum zone_stat_item item,
-			     long delta, int overstep_mode)
+static inline void mod_zone_state(struct zone *zone,
+       enum zone_stat_item item, long delta, int overstep_mode)
 {
 	struct per_cpu_pageset __percpu *pcp = zone->pageset;
 	s8 __percpu *p = pcp->vm_stat_diff + item;
@@ -359,26 +429,88 @@ static inline void mod_state(struct zone *zone, enum zone_stat_item item,
 void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
 			 long delta)
 {
-	mod_state(zone, item, delta, 0);
+	mod_zone_state(zone, item, delta, 0);
 }
 EXPORT_SYMBOL(mod_zone_page_state);
 
 void inc_zone_state(struct zone *zone, enum zone_stat_item item)
 {
-	mod_state(zone, item, 1, 1);
+	mod_zone_state(zone, item, 1, 1);
 }
 
 void inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
-	mod_state(page_zone(page), item, 1, 1);
+	mod_zone_state(page_zone(page), item, 1, 1);
 }
 EXPORT_SYMBOL(inc_zone_page_state);
 
 void dec_zone_page_state(struct page *page, enum zone_stat_item item)
 {
-	mod_state(page_zone(page), item, -1, -1);
+	mod_zone_state(page_zone(page), item, -1, -1);
 }
 EXPORT_SYMBOL(dec_zone_page_state);
+
+static inline void mod_node_state(struct pglist_data *pgdat,
+       enum node_stat_item item, int delta, int overstep_mode)
+{
+	struct per_cpu_nodestat __percpu *pcp = pgdat->per_cpu_nodestats;
+	s8 __percpu *p = pcp->vm_node_stat_diff + item;
+	long o, n, t, z;
+
+	do {
+		z = 0;  /* overflow to zone counters */
+
+		/*
+		 * The fetching of the stat_threshold is racy. We may apply
+		 * a counter threshold to the wrong the cpu if we get
+		 * rescheduled while executing here. However, the next
+		 * counter update will apply the threshold again and
+		 * therefore bring the counter under the threshold again.
+		 *
+		 * Most of the time the thresholds are the same anyways
+		 * for all cpus in a zone.
+		 */
+		t = this_cpu_read(pcp->stat_threshold);
+
+		o = this_cpu_read(*p);
+		n = delta + o;
+
+		if (n > t || n < -t) {
+			int os = overstep_mode * (t >> 1) ;
+
+			/* Overflow must be added to zone counters */
+			z = n + os;
+			n = -os;
+		}
+	} while (this_cpu_cmpxchg(*p, o, n) != o);
+
+	if (z)
+		node_page_state_add(z, pgdat, item);
+}
+
+void mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
+					long delta)
+{
+	mod_node_state(pgdat, item, delta, 0);
+}
+EXPORT_SYMBOL(mod_node_page_state);
+
+void inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+{
+	mod_node_state(pgdat, item, 1, 1);
+}
+
+void inc_node_page_state(struct page *page, enum node_stat_item item)
+{
+	mod_node_state(page_zone(page)->zone_pgdat, item, 1, 1);
+}
+EXPORT_SYMBOL(inc_node_page_state);
+
+void dec_node_page_state(struct page *page, enum node_stat_item item)
+{
+	mod_node_state(page_zone(page)->zone_pgdat, item, -1, -1);
+}
+EXPORT_SYMBOL(dec_node_page_state);
 #else
 /*
  * Use interrupt disable to serialize counter updates
@@ -424,21 +556,69 @@ void dec_zone_page_state(struct page *page, enum zone_stat_item item)
 	local_irq_restore(flags);
 }
 EXPORT_SYMBOL(dec_zone_page_state);
-#endif
 
+void inc_node_state(struct pglist_data *pgdat, enum node_stat_item item)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	__inc_node_state(pgdat, item);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(inc_node_state);
+
+void mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
+					long delta)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	__mod_node_page_state(pgdat, item, delta);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(mod_node_page_state);
+
+void inc_node_page_state(struct page *page, enum node_stat_item item)
+{
+	unsigned long flags;
+	struct pglist_data *pgdat;
+
+	pgdat = page_zone(page)->zone_pgdat;
+	local_irq_save(flags);
+	__inc_node_state(pgdat, item);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(inc_node_page_state);
+
+void dec_node_page_state(struct page *page, enum node_stat_item item)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	__dec_node_page_state(page, item);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(dec_node_page_state);
+#endif
 
 /*
  * Fold a differential into the global counters.
  * Returns the number of counters updated.
  */
-static int fold_diff(int *diff)
+static int fold_diff(int *zone_diff, int *node_diff)
 {
 	int i;
 	int changes = 0;
 
 	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
-		if (diff[i]) {
-			atomic_long_add(diff[i], &vm_stat[i]);
+		if (zone_diff[i]) {
+			atomic_long_add(zone_diff[i], &vm_zone_stat[i]);
+			changes++;
+	}
+
+	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+		if (node_diff[i]) {
+			atomic_long_add(node_diff[i], &vm_node_stat[i]);
 			changes++;
 	}
 	return changes;
@@ -462,9 +642,11 @@ static int fold_diff(int *diff)
  */
 static int refresh_cpu_vm_stats(bool do_pagesets)
 {
+	struct pglist_data *pgdat;
 	struct zone *zone;
 	int i;
-	int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
+	int global_zone_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
+	int global_node_diff[NR_VM_NODE_STAT_ITEMS] = { 0, };
 	int changes = 0;
 
 	for_each_populated_zone(zone) {
@@ -477,7 +659,7 @@ static int refresh_cpu_vm_stats(bool do_pagesets)
 			if (v) {
 
 				atomic_long_add(v, &zone->vm_stat[i]);
-				global_diff[i] += v;
+				global_zone_diff[i] += v;
 #ifdef CONFIG_NUMA
 				/* 3 seconds idle till flush */
 				__this_cpu_write(p->expire, 3);
@@ -516,7 +698,22 @@ static int refresh_cpu_vm_stats(bool do_pagesets)
 		}
 #endif
 	}
-	changes += fold_diff(global_diff);
+
+	for_each_online_pgdat(pgdat) {
+		struct per_cpu_nodestat __percpu *p = pgdat->per_cpu_nodestats;
+
+		for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+			int v;
+
+			v = this_cpu_xchg(p->vm_node_stat_diff[i], 0);
+			if (v) {
+				atomic_long_add(v, &pgdat->vm_stat[i]);
+				global_node_diff[i] += v;
+			}
+		}
+	}
+
+	changes += fold_diff(global_zone_diff, global_node_diff);
 	return changes;
 }
 
@@ -527,9 +724,11 @@ static int refresh_cpu_vm_stats(bool do_pagesets)
  */
 void cpu_vm_stats_fold(int cpu)
 {
+	struct pglist_data *pgdat;
 	struct zone *zone;
 	int i;
-	int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
+	int global_zone_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
+	int global_node_diff[NR_VM_NODE_STAT_ITEMS] = { 0, };
 
 	for_each_populated_zone(zone) {
 		struct per_cpu_pageset *p;
@@ -543,11 +742,25 @@ void cpu_vm_stats_fold(int cpu)
 				v = p->vm_stat_diff[i];
 				p->vm_stat_diff[i] = 0;
 				atomic_long_add(v, &zone->vm_stat[i]);
-				global_diff[i] += v;
+				global_zone_diff[i] += v;
 			}
 	}
 
-	fold_diff(global_diff);
+	for_each_online_pgdat(pgdat) {
+		struct per_cpu_nodestat __percpu *p = pgdat->per_cpu_nodestats;
+
+		for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+			if (p->vm_node_stat_diff[i]) {
+				int v;
+
+				v = p->vm_node_stat_diff[i];
+				p->vm_node_stat_diff[i] = 0;
+				atomic_long_add(v, &pgdat->vm_stat[i]);
+				global_node_diff[i] += v;
+			}
+	}
+
+	fold_diff(global_zone_diff, global_node_diff);
 }
 
 /*
@@ -563,7 +776,7 @@ void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset)
 			int v = pset->vm_stat_diff[i];
 			pset->vm_stat_diff[i] = 0;
 			atomic_long_add(v, &zone->vm_stat[i]);
-			atomic_long_add(v, &vm_stat[i]);
+			atomic_long_add(v, &vm_zone_stat[i]);
 		}
 }
 #endif
@@ -595,9 +808,12 @@ void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags)
 }
 
 /*
- * Determine the per node value of a stat item.
+ * Determine the per node value of a stat item. This function
+ * is called frequently in a NUMA machine, so try to be as
+ * frugal as possible.
  */
-unsigned long node_page_state(int node, enum zone_stat_item item)
+unsigned long sum_zone_node_page_state(int node,
+				 enum zone_stat_item item)
 {
 	struct zone *zones = NODE_DATA(node)->node_zones;
 
@@ -615,6 +831,19 @@ unsigned long node_page_state(int node, enum zone_stat_item item)
 		zone_page_state(&zones[ZONE_MOVABLE], item);
 }
 
+/*
+ * Determine the per node value of a stat item.
+ */
+unsigned long node_page_state(struct pglist_data *pgdat,
+				enum node_stat_item item)
+{
+	long x = atomic_long_read(&pgdat->vm_stat[item]);
+#ifdef CONFIG_SMP
+	if (x < 0)
+		x = 0;
+#endif
+	return x;
+}
 #endif
 
 #ifdef CONFIG_COMPACTION
@@ -1303,6 +1532,7 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
 	if (*pos >= ARRAY_SIZE(vmstat_text))
 		return NULL;
 	stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) +
+			  NR_VM_NODE_STAT_ITEMS * sizeof(unsigned long) +
 			  NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long);
 
 #ifdef CONFIG_VM_EVENT_COUNTERS
@@ -1317,6 +1547,10 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos)
 		v[i] = global_page_state(i);
 	v += NR_VM_ZONE_STAT_ITEMS;
 
+	for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++)
+		v[i] = global_node_page_state(i);
+	v += NR_VM_NODE_STAT_ITEMS;
+
 	global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD,
 			    v + NR_DIRTY_THRESHOLD);
 	v += NR_VM_WRITEBACK_STAT_ITEMS;
diff --git a/mm/workingset.c b/mm/workingset.c
index 8a75f8d2916a..ac36efa8c754 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -349,12 +349,13 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
 	shadow_nodes = list_lru_shrink_count(&workingset_shadow_nodes, sc);
 	local_irq_enable();
 
-	if (memcg_kmem_enabled())
+	if (memcg_kmem_enabled()) {
 		pages = mem_cgroup_node_nr_lru_pages(sc->memcg, sc->nid,
 						     LRU_ALL_FILE);
-	else
-		pages = node_page_state(sc->nid, NR_ACTIVE_FILE) +
-			node_page_state(sc->nid, NR_INACTIVE_FILE);
+	} else {
+		pages = sum_zone_node_page_state(sc->nid, NR_ACTIVE_FILE) +
+			sum_zone_node_page_state(sc->nid, NR_INACTIVE_FILE);
+	}
 
 	/*
 	 * Active cache pages are limited to 50% of memory, and shadow
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 03/27] mm, vmscan: Move lru_lock to the node
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
  2016-04-06 11:20 ` [PATCH 01/27] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone) Mel Gorman
  2016-04-06 11:20 ` [PATCH 02/27] mm, vmstat: Add infrastructure for per-node vmstats Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 04/27] mm, vmscan: Move LRU lists to node Mel Gorman
                   ` (17 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Node-based reclaim requires node-based LRUs and locking. This is a
preparation patch that just moves the lru_lock to the node so later patches
are easier to review. It is a mechanical change but note this patch makes
contention worse because the LRU lock is hotter and direct reclaim and kswapd
can contend on the same lock even when reclaiming from different zones.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 Documentation/cgroup-v1/memcg_test.txt |  4 +--
 Documentation/cgroup-v1/memory.txt     |  4 +--
 include/linux/mm_types.h               |  2 +-
 include/linux/mmzone.h                 | 10 +++++--
 mm/compaction.c                        |  6 ++---
 mm/filemap.c                           |  4 +--
 mm/huge_memory.c                       |  4 +--
 mm/memcontrol.c                        |  6 ++---
 mm/mlock.c                             | 10 +++----
 mm/page_alloc.c                        |  4 +--
 mm/page_idle.c                         |  4 +--
 mm/rmap.c                              |  2 +-
 mm/swap.c                              | 30 ++++++++++-----------
 mm/vmscan.c                            | 48 +++++++++++++++++-----------------
 14 files changed, 72 insertions(+), 66 deletions(-)

diff --git a/Documentation/cgroup-v1/memcg_test.txt b/Documentation/cgroup-v1/memcg_test.txt
index 8870b0212150..78a8c2963b38 100644
--- a/Documentation/cgroup-v1/memcg_test.txt
+++ b/Documentation/cgroup-v1/memcg_test.txt
@@ -107,9 +107,9 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y.
 
 8. LRU
         Each memcg has its own private LRU. Now, its handling is under global
-	VM's control (means that it's handled under global zone->lru_lock).
+	VM's control (means that it's handled under global zone_lru_lock).
 	Almost all routines around memcg's LRU is called by global LRU's
-	list management functions under zone->lru_lock().
+	list management functions under zone_lru_lock().
 
 	A special function is mem_cgroup_isolate_pages(). This scans
 	memcg's private LRU and call __isolate_lru_page() to extract a page
diff --git a/Documentation/cgroup-v1/memory.txt b/Documentation/cgroup-v1/memory.txt
index ff71e16cc752..2060e402869c 100644
--- a/Documentation/cgroup-v1/memory.txt
+++ b/Documentation/cgroup-v1/memory.txt
@@ -267,11 +267,11 @@ When oom event notifier is registered, event will be delivered.
    Other lock order is following:
    PG_locked.
    mm->page_table_lock
-       zone->lru_lock
+       zone_lru_lock
 	  lock_page_cgroup.
   In many cases, just lock_page_cgroup() is called.
   per-zone-per-cgroup LRU (cgroup's private LRU) is just guarded by
-  zone->lru_lock, it has no lock of its own.
+  zone_lru_lock, it has no lock of its own.
 
 2.7 Kernel Memory Extension (CONFIG_MEMCG_KMEM)
 
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 944b2b37313b..73a06e582bfa 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -112,7 +112,7 @@ struct page {
 	 */
 	union {
 		struct list_head lru;	/* Pageout list, eg. active_list
-					 * protected by zone->lru_lock !
+					 * protected by zone_lru_lock !
 					 * Can be used as a generic list
 					 * by the page owner.
 					 */
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index ed62672375bf..3f39d0602dbd 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -100,7 +100,7 @@ struct free_area {
 struct pglist_data;
 
 /*
- * zone->lock and zone->lru_lock are two of the hottest locks in the kernel.
+ * zone->lock and the zone lru_lock are two of the hottest locks in the kernel.
  * So add a wild amount of padding here to ensure that they fall into separate
  * cachelines.  There are very few zone structures in the machine, so space
  * consumption is not a concern here.
@@ -498,7 +498,6 @@ struct zone {
 	/* Write-intensive fields used by page reclaim */
 
 	/* Fields commonly accessed by the page reclaim scanner */
-	spinlock_t		lru_lock;
 	struct lruvec		lruvec;
 
 	/*
@@ -693,6 +692,9 @@ typedef struct pglist_data {
 	/* Number of pages migrated during the rate limiting time interval */
 	unsigned long numabalancing_migrate_nr_pages;
 #endif
+	/* Write-intensive fields used from the page allocator */
+	ZONE_PADDING(_pad1_)
+	spinlock_t		lru_lock;
 
 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
 	/*
@@ -724,6 +726,10 @@ typedef struct pglist_data {
 
 #define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)
 #define node_end_pfn(nid) pgdat_end_pfn(NODE_DATA(nid))
+static inline spinlock_t *zone_lru_lock(struct zone *zone)
+{
+	return &zone->zone_pgdat->lru_lock;
+}
 
 static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat)
 {
diff --git a/mm/compaction.c b/mm/compaction.c
index ccf97b02b85f..2264b75231ba 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -669,7 +669,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 * if contended.
 		 */
 		if (!(low_pfn % SWAP_CLUSTER_MAX)
-		    && compact_unlock_should_abort(&zone->lru_lock, flags,
+		    && compact_unlock_should_abort(zone_lru_lock(zone), flags,
 								&locked, cc))
 			break;
 
@@ -746,7 +746,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 		/* If we already hold the lock, we can skip some rechecking */
 		if (!locked) {
-			locked = compact_trylock_irqsave(&zone->lru_lock,
+			locked = compact_trylock_irqsave(zone_lru_lock(zone),
 								&flags, cc);
 			if (!locked)
 				break;
@@ -797,7 +797,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		low_pfn = end_pfn;
 
 	if (locked)
-		spin_unlock_irqrestore(&zone->lru_lock, flags);
+		spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 
 	/*
 	 * Update the pageblock-skip information and cached scanner pfn,
diff --git a/mm/filemap.c b/mm/filemap.c
index a8c69c8c0a90..99c62afbb71b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -95,8 +95,8 @@
  *    ->swap_lock		(try_to_unmap_one)
  *    ->private_lock		(try_to_unmap_one)
  *    ->tree_lock		(try_to_unmap_one)
- *    ->zone.lru_lock		(follow_page->mark_page_accessed)
- *    ->zone.lru_lock		(check_pte_range->isolate_lru_page)
+ *    ->zone_lru_lock(zone)	(follow_page->mark_page_accessed)
+ *    ->zone_lru_lock(zone)	(check_pte_range->isolate_lru_page)
  *    ->private_lock		(page_remove_rmap->set_page_dirty)
  *    ->tree_lock		(page_remove_rmap->set_page_dirty)
  *    bdi.wb->list_lock		(page_remove_rmap->set_page_dirty)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 86f9f8b82f8e..fa5865bcdfa3 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3174,7 +3174,7 @@ static void __split_huge_page(struct page *page, struct list_head *list)
 	int i;
 
 	/* prevent PageLRU to go away from under us, and freeze lru stats */
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	lruvec = mem_cgroup_page_lruvec(head, zone);
 
 	/* complete memcg works before add pages to LRU */
@@ -3184,7 +3184,7 @@ static void __split_huge_page(struct page *page, struct list_head *list)
 		__split_huge_page_tail(head, i, lruvec, list);
 
 	ClearPageCompound(head);
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	unfreeze_page(head);
 
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 36db05fa8acb..4f597c5df207 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2085,7 +2085,7 @@ static void lock_page_lru(struct page *page, int *isolated)
 {
 	struct zone *zone = page_zone(page);
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	if (PageLRU(page)) {
 		struct lruvec *lruvec;
 
@@ -2109,7 +2109,7 @@ static void unlock_page_lru(struct page *page, int isolated)
 		SetPageLRU(page);
 		add_page_to_lru_list(page, lruvec, page_lru(page));
 	}
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 }
 
 static void commit_charge(struct page *page, struct mem_cgroup *memcg,
@@ -2374,7 +2374,7 @@ void __memcg_kmem_uncharge(struct page *page, int order)
 
 /*
  * Because tail pages are not marked as "used", set it. We're under
- * zone->lru_lock and migration entries setup in all page mappings.
+ * zone_lru_lock and migration entries setup in all page mappings.
  */
 void mem_cgroup_split_huge_fixup(struct page *head)
 {
diff --git a/mm/mlock.c b/mm/mlock.c
index 96f001041928..ce7dabd53e7e 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -188,7 +188,7 @@ unsigned int munlock_vma_page(struct page *page)
 	 * might otherwise copy PageMlocked to part of the tail pages before
 	 * we clear it in the head page. It also stabilizes hpage_nr_pages().
 	 */
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 
 	nr_pages = hpage_nr_pages(page);
 	if (!TestClearPageMlocked(page))
@@ -197,14 +197,14 @@ unsigned int munlock_vma_page(struct page *page)
 	__mod_zone_page_state(zone, NR_MLOCK, -nr_pages);
 
 	if (__munlock_isolate_lru_page(page, true)) {
-		spin_unlock_irq(&zone->lru_lock);
+		spin_unlock_irq(zone_lru_lock(zone));
 		__munlock_isolated_page(page);
 		goto out;
 	}
 	__munlock_isolation_failed(page);
 
 unlock_out:
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 out:
 	return nr_pages - 1;
@@ -289,7 +289,7 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
 	pagevec_init(&pvec_putback, 0);
 
 	/* Phase 1: page isolation */
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	for (i = 0; i < nr; i++) {
 		struct page *page = pvec->pages[i];
 
@@ -315,7 +315,7 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
 	}
 	delta_munlocked = -nr + pagevec_count(&pvec_putback);
 	__mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	/* Now we can release pins of pages that we are not munlocking */
 	pagevec_release(&pvec_putback);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7f9ce45c191b..dbbd36cbe839 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5524,10 +5524,10 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 		zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100;
 #endif
 		zone->name = zone_names[j];
+		zone->zone_pgdat = pgdat;
 		spin_lock_init(&zone->lock);
-		spin_lock_init(&zone->lru_lock);
+		spin_lock_init(zone_lru_lock(zone));
 		zone_seqlock_init(zone);
-		zone->zone_pgdat = pgdat;
 		zone_pcp_init(zone);
 
 		/* For bootup, initialized properly in watermark setup */
diff --git a/mm/page_idle.c b/mm/page_idle.c
index 4ea9c4ef5146..ae11aa914e55 100644
--- a/mm/page_idle.c
+++ b/mm/page_idle.c
@@ -41,12 +41,12 @@ static struct page *page_idle_get_page(unsigned long pfn)
 		return NULL;
 
 	zone = page_zone(page);
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	if (unlikely(!PageLRU(page))) {
 		put_page(page);
 		page = NULL;
 	}
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 	return page;
 }
 
diff --git a/mm/rmap.c b/mm/rmap.c
index c399a0d41b31..5b3c19f633c2 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -27,7 +27,7 @@
  *         mapping->i_mmap_rwsem
  *           anon_vma->rwsem
  *             mm->page_table_lock or pte_lock
- *               zone->lru_lock (in mark_page_accessed, isolate_lru_page)
+ *               zone_lru_lock (in mark_page_accessed, isolate_lru_page)
  *               swap_lock (in swap_duplicate, swap_info_get)
  *                 mmlist_lock (in mmput, drain_mmlist and others)
  *                 mapping->private_lock (in __set_page_dirty_buffers)
diff --git a/mm/swap.c b/mm/swap.c
index 09fe5e97714a..4067911033e1 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -59,12 +59,12 @@ static void __page_cache_release(struct page *page)
 		struct lruvec *lruvec;
 		unsigned long flags;
 
-		spin_lock_irqsave(&zone->lru_lock, flags);
+		spin_lock_irqsave(zone_lru_lock(zone), flags);
 		lruvec = mem_cgroup_page_lruvec(page, zone);
 		VM_BUG_ON_PAGE(!PageLRU(page), page);
 		__ClearPageLRU(page);
 		del_page_from_lru_list(page, lruvec, page_off_lru(page));
-		spin_unlock_irqrestore(&zone->lru_lock, flags);
+		spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 	}
 	mem_cgroup_uncharge(page);
 }
@@ -186,16 +186,16 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
 
 		if (pagezone != zone) {
 			if (zone)
-				spin_unlock_irqrestore(&zone->lru_lock, flags);
+				spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 			zone = pagezone;
-			spin_lock_irqsave(&zone->lru_lock, flags);
+			spin_lock_irqsave(zone_lru_lock(zone), flags);
 		}
 
 		lruvec = mem_cgroup_page_lruvec(page, zone);
 		(*move_fn)(page, lruvec, arg);
 	}
 	if (zone)
-		spin_unlock_irqrestore(&zone->lru_lock, flags);
+		spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 	release_pages(pvec->pages, pvec->nr, pvec->cold);
 	pagevec_reinit(pvec);
 }
@@ -315,9 +315,9 @@ void activate_page(struct page *page)
 {
 	struct zone *zone = page_zone(page);
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	__activate_page(page, mem_cgroup_page_lruvec(page, zone), NULL);
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 }
 #endif
 
@@ -446,13 +446,13 @@ void add_page_to_unevictable_list(struct page *page)
 	struct zone *zone = page_zone(page);
 	struct lruvec *lruvec;
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	lruvec = mem_cgroup_page_lruvec(page, zone);
 	ClearPageActive(page);
 	SetPageUnevictable(page);
 	SetPageLRU(page);
 	add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE);
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 }
 
 /**
@@ -724,7 +724,7 @@ void release_pages(struct page **pages, int nr, bool cold)
 		 * same zone. The lock is held only if zone != NULL.
 		 */
 		if (zone && ++lock_batch == SWAP_CLUSTER_MAX) {
-			spin_unlock_irqrestore(&zone->lru_lock, flags);
+			spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 			zone = NULL;
 		}
 
@@ -734,7 +734,7 @@ void release_pages(struct page **pages, int nr, bool cold)
 
 		if (PageCompound(page)) {
 			if (zone) {
-				spin_unlock_irqrestore(&zone->lru_lock, flags);
+				spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 				zone = NULL;
 			}
 			__put_compound_page(page);
@@ -746,11 +746,11 @@ void release_pages(struct page **pages, int nr, bool cold)
 
 			if (pagezone != zone) {
 				if (zone)
-					spin_unlock_irqrestore(&zone->lru_lock,
+					spin_unlock_irqrestore(zone_lru_lock(zone),
 									flags);
 				lock_batch = 0;
 				zone = pagezone;
-				spin_lock_irqsave(&zone->lru_lock, flags);
+				spin_lock_irqsave(zone_lru_lock(zone), flags);
 			}
 
 			lruvec = mem_cgroup_page_lruvec(page, zone);
@@ -765,7 +765,7 @@ void release_pages(struct page **pages, int nr, bool cold)
 		list_add(&page->lru, &pages_to_free);
 	}
 	if (zone)
-		spin_unlock_irqrestore(&zone->lru_lock, flags);
+		spin_unlock_irqrestore(zone_lru_lock(zone), flags);
 
 	mem_cgroup_uncharge_list(&pages_to_free);
 	free_hot_cold_page_list(&pages_to_free, cold);
@@ -801,7 +801,7 @@ void lru_add_page_tail(struct page *page, struct page *page_tail,
 	VM_BUG_ON_PAGE(PageCompound(page_tail), page);
 	VM_BUG_ON_PAGE(PageLRU(page_tail), page);
 	VM_BUG_ON(NR_CPUS != 1 &&
-		  !spin_is_locked(&lruvec_zone(lruvec)->lru_lock));
+		  !spin_is_locked(zone_lru_lock(lruvec_zone(lruvec))));
 
 	if (!list)
 		SetPageLRU(page_tail);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b934223eaa45..2148c795328e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1343,7 +1343,7 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode)
 }
 
 /*
- * zone->lru_lock is heavily contended.  Some of the functions that
+ * zone_lru_lock is heavily contended.  Some of the functions that
  * shrink the lists perform better by taking out a batch of pages
  * and working on them outside the LRU lock.
  *
@@ -1441,7 +1441,7 @@ int isolate_lru_page(struct page *page)
 		struct zone *zone = page_zone(page);
 		struct lruvec *lruvec;
 
-		spin_lock_irq(&zone->lru_lock);
+		spin_lock_irq(zone_lru_lock(zone));
 		lruvec = mem_cgroup_page_lruvec(page, zone);
 		if (PageLRU(page)) {
 			int lru = page_lru(page);
@@ -1450,7 +1450,7 @@ int isolate_lru_page(struct page *page)
 			del_page_from_lru_list(page, lruvec, lru);
 			ret = 0;
 		}
-		spin_unlock_irq(&zone->lru_lock);
+		spin_unlock_irq(zone_lru_lock(zone));
 	}
 	return ret;
 }
@@ -1509,9 +1509,9 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 		list_del(&page->lru);
 		if (unlikely(!page_evictable(page))) {
-			spin_unlock_irq(&zone->lru_lock);
+			spin_unlock_irq(zone_lru_lock(zone));
 			putback_lru_page(page);
-			spin_lock_irq(&zone->lru_lock);
+			spin_lock_irq(zone_lru_lock(zone));
 			continue;
 		}
 
@@ -1532,10 +1532,10 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 			del_page_from_lru_list(page, lruvec, lru);
 
 			if (unlikely(PageCompound(page))) {
-				spin_unlock_irq(&zone->lru_lock);
+				spin_unlock_irq(zone_lru_lock(zone));
 				mem_cgroup_uncharge(page);
 				(*get_compound_page_dtor(page))(page);
-				spin_lock_irq(&zone->lru_lock);
+				spin_lock_irq(zone_lru_lock(zone));
 			} else
 				list_add(&page->lru, &pages_to_free);
 		}
@@ -1597,7 +1597,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	if (!sc->may_writepage)
 		isolate_mode |= ISOLATE_CLEAN;
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 
 	nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list,
 				     &nr_scanned, sc, isolate_mode, lru);
@@ -1612,7 +1612,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 		else
 			__count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned);
 	}
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	if (nr_taken == 0)
 		return 0;
@@ -1622,7 +1622,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 				&nr_writeback, &nr_immediate,
 				false);
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 
 	reclaim_stat->recent_scanned[file] += nr_taken;
 
@@ -1639,7 +1639,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 
 	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
 
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	mem_cgroup_uncharge_list(&page_list);
 	free_hot_cold_page_list(&page_list, true);
@@ -1713,9 +1713,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
  * processes, from rmap.
  *
  * If the pages are mostly unmapped, the processing is fast and it is
- * appropriate to hold zone->lru_lock across the whole operation.  But if
+ * appropriate to hold zone_lru_lock across the whole operation.  But if
  * the pages are mapped, the processing is slow (page_referenced()) so we
- * should drop zone->lru_lock around each page.  It's impossible to balance
+ * should drop zone_lru_lock around each page.  It's impossible to balance
  * this, so instead we remove the pages from the LRU while processing them.
  * It is safe to rely on PG_active against the non-LRU pages in here because
  * nobody will play with that bit on a non-LRU page.
@@ -1752,10 +1752,10 @@ static void move_active_pages_to_lru(struct lruvec *lruvec,
 			del_page_from_lru_list(page, lruvec, lru);
 
 			if (unlikely(PageCompound(page))) {
-				spin_unlock_irq(&zone->lru_lock);
+				spin_unlock_irq(zone_lru_lock(zone));
 				mem_cgroup_uncharge(page);
 				(*get_compound_page_dtor(page))(page);
-				spin_lock_irq(&zone->lru_lock);
+				spin_lock_irq(zone_lru_lock(zone));
 			} else
 				list_add(&page->lru, pages_to_free);
 		}
@@ -1790,7 +1790,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	if (!sc->may_writepage)
 		isolate_mode |= ISOLATE_CLEAN;
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 
 	nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
 				     &nr_scanned, sc, isolate_mode, lru);
@@ -1802,7 +1802,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	__count_zone_vm_events(PGREFILL, zone, nr_scanned);
 	__mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken);
 	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	while (!list_empty(&l_hold)) {
 		cond_resched();
@@ -1847,7 +1847,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	/*
 	 * Move pages back to the lru list.
 	 */
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	/*
 	 * Count referenced pages from currently used mappings as rotated,
 	 * even though only some of them are actually re-activated.  This
@@ -1859,7 +1859,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	move_active_pages_to_lru(lruvec, &l_active, &l_hold, lru);
 	move_active_pages_to_lru(lruvec, &l_inactive, &l_hold, lru - LRU_ACTIVE);
 	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	mem_cgroup_uncharge_list(&l_hold);
 	free_hot_cold_page_list(&l_hold, true);
@@ -2094,7 +2094,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	file  = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE) +
 		lruvec_lru_size(lruvec, LRU_INACTIVE_FILE);
 
-	spin_lock_irq(&zone->lru_lock);
+	spin_lock_irq(zone_lru_lock(zone));
 	if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
 		reclaim_stat->recent_scanned[0] /= 2;
 		reclaim_stat->recent_rotated[0] /= 2;
@@ -2115,7 +2115,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 
 	fp = file_prio * (reclaim_stat->recent_scanned[1] + 1);
 	fp /= reclaim_stat->recent_rotated[1] + 1;
-	spin_unlock_irq(&zone->lru_lock);
+	spin_unlock_irq(zone_lru_lock(zone));
 
 	fraction[0] = ap;
 	fraction[1] = fp;
@@ -3825,9 +3825,9 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
 		pagezone = page_zone(page);
 		if (pagezone != zone) {
 			if (zone)
-				spin_unlock_irq(&zone->lru_lock);
+				spin_unlock_irq(zone_lru_lock(zone));
 			zone = pagezone;
-			spin_lock_irq(&zone->lru_lock);
+			spin_lock_irq(zone_lru_lock(zone));
 		}
 		lruvec = mem_cgroup_page_lruvec(page, zone);
 
@@ -3848,7 +3848,7 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
 	if (zone) {
 		__count_vm_events(UNEVICTABLE_PGRESCUED, pgrescued);
 		__count_vm_events(UNEVICTABLE_PGSCANNED, pgscanned);
-		spin_unlock_irq(&zone->lru_lock);
+		spin_unlock_irq(zone_lru_lock(zone));
 	}
 }
 #endif /* CONFIG_SHMEM */
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 04/27] mm, vmscan: Move LRU lists to node
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (2 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 03/27] mm, vmscan: Move lru_lock to the node Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 05/27] mm, vmscan: Begin reclaiming pages on a per-node basis Mel Gorman
                   ` (16 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

This moves the LRU lists from the zone to the node and all related data
such as counters, tracing, congestion tracking and writeback tracking.
This is mostly a mechanical patch but note that it introduces a number
of anomalies. For example, the scans are per-zone but using per-node
counters. We also mark a node as congested when a zone is congested. This
causes weird problems that are fixed later but is easier to review.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 arch/tile/mm/pgtable.c                    |   8 +-
 drivers/base/node.c                       |  19 +--
 drivers/staging/android/lowmemorykiller.c |   8 +-
 include/linux/backing-dev.h               |   2 +-
 include/linux/memcontrol.h                |   8 +-
 include/linux/mm_inline.h                 |   4 +-
 include/linux/mmzone.h                    |  66 ++++++----
 include/linux/vm_event_item.h             |  10 +-
 include/linux/vmstat.h                    |  17 +++
 include/trace/events/vmscan.h             |  12 +-
 kernel/power/snapshot.c                   |  10 +-
 mm/backing-dev.c                          |  14 +-
 mm/compaction.c                           |  18 +--
 mm/huge_memory.c                          |   6 +-
 mm/internal.h                             |   2 +-
 mm/memcontrol.c                           |  18 +--
 mm/memory-failure.c                       |   4 +-
 mm/memory_hotplug.c                       |   2 +-
 mm/mempolicy.c                            |   2 +-
 mm/migrate.c                              |  21 +--
 mm/mlock.c                                |   2 +-
 mm/page-writeback.c                       |   8 +-
 mm/page_alloc.c                           |  99 ++++++++------
 mm/swap.c                                 |  56 ++++----
 mm/vmscan.c                               | 212 ++++++++++++++++--------------
 mm/vmstat.c                               |  45 +++----
 mm/workingset.c                           |   5 +-
 27 files changed, 369 insertions(+), 309 deletions(-)

diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 7bf2491a9c1f..3ed0a666d44a 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -45,10 +45,10 @@ void show_mem(unsigned int filter)
 	struct zone *zone;
 
 	pr_err("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu free:%lu\n slab:%lu mapped:%lu pagetables:%lu bounce:%lu pagecache:%lu swap:%lu\n",
-	       (global_page_state(NR_ACTIVE_ANON) +
-		global_page_state(NR_ACTIVE_FILE)),
-	       (global_page_state(NR_INACTIVE_ANON) +
-		global_page_state(NR_INACTIVE_FILE)),
+	       (global_node_page_state(NR_ACTIVE_ANON) +
+		global_node_page_state(NR_ACTIVE_FILE)),
+	       (global_node_page_state(NR_INACTIVE_ANON) +
+		global_node_page_state(NR_INACTIVE_FILE)),
 	       global_page_state(NR_FILE_DIRTY),
 	       global_page_state(NR_WRITEBACK),
 	       global_page_state(NR_UNSTABLE_NFS),
diff --git a/drivers/base/node.c b/drivers/base/node.c
index efb81da250a8..4260c7f3ee1b 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -56,6 +56,7 @@ static ssize_t node_read_meminfo(struct device *dev,
 {
 	int n;
 	int nid = dev->id;
+	struct pglist_data *pgdat = NODE_DATA(nid);
 	struct sysinfo i;
 
 	si_meminfo_node(&i, nid);
@@ -74,15 +75,15 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(i.totalram),
 		       nid, K(i.freeram),
 		       nid, K(i.totalram - i.freeram),
-		       nid, K(sum_zone_node_page_state(nid, NR_ACTIVE_ANON) +
-				sum_zone_node_page_state(nid, NR_ACTIVE_FILE)),
-		       nid, K(sum_zone_node_page_state(nid, NR_INACTIVE_ANON) +
-				sum_zone_node_page_state(nid, NR_INACTIVE_FILE)),
-		       nid, K(sum_zone_node_page_state(nid, NR_ACTIVE_ANON)),
-		       nid, K(sum_zone_node_page_state(nid, NR_INACTIVE_ANON)),
-		       nid, K(sum_zone_node_page_state(nid, NR_ACTIVE_FILE)),
-		       nid, K(sum_zone_node_page_state(nid, NR_INACTIVE_FILE)),
-		       nid, K(sum_zone_node_page_state(nid, NR_UNEVICTABLE)),
+		       nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) +
+				node_page_state(pgdat, NR_ACTIVE_FILE)),
+		       nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) +
+				node_page_state(pgdat, NR_INACTIVE_FILE)),
+		       nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)),
+		       nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)),
+		       nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)),
+		       nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)),
+		       nid, K(node_page_state(pgdat, NR_UNEVICTABLE)),
 		       nid, K(sum_zone_node_page_state(nid, NR_MLOCK)));
 
 #ifdef CONFIG_HIGHMEM
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index 2509e5df7244..ad2f97ccb0d3 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -72,10 +72,10 @@ static unsigned long lowmem_deathpending_timeout;
 static unsigned long lowmem_count(struct shrinker *s,
 				  struct shrink_control *sc)
 {
-	return global_page_state(NR_ACTIVE_ANON) +
-		global_page_state(NR_ACTIVE_FILE) +
-		global_page_state(NR_INACTIVE_ANON) +
-		global_page_state(NR_INACTIVE_FILE);
+	return global_node_page_state(NR_ACTIVE_ANON) +
+		global_node_page_state(NR_ACTIVE_FILE) +
+		global_node_page_state(NR_INACTIVE_ANON) +
+		global_node_page_state(NR_INACTIVE_FILE);
 }
 
 static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index c82794f20110..491a91717788 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -197,7 +197,7 @@ static inline int wb_congested(struct bdi_writeback *wb, int cong_bits)
 }
 
 long congestion_wait(int sync, long timeout);
-long wait_iff_congested(struct zone *zone, int sync, long timeout);
+long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout);
 int pdflush_proc_obsolete(struct ctl_table *table, int write,
 		void __user *buffer, size_t *lenp, loff_t *ppos);
 
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1191d79aa495..f5626a5c88c2 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -307,7 +307,7 @@ void mem_cgroup_uncharge_list(struct list_head *page_list);
 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
 
 struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
-struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
+struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
 
 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
 struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
@@ -595,13 +595,13 @@ static inline void mem_cgroup_migrate(struct page *old, struct page *new)
 static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
 						    struct mem_cgroup *memcg)
 {
-	return &zone->lruvec;
+	return zone_lruvec(zone);
 }
 
 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
-						    struct zone *zone)
+						    struct pglist_data *pgdat)
 {
-	return &zone->lruvec;
+	return &pgdat->lruvec;
 }
 
 static inline bool mm_match_cgroup(struct mm_struct *mm,
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 712e8c37a200..5817ae41ba30 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -28,7 +28,7 @@ static __always_inline void add_page_to_lru_list(struct page *page,
 	int nr_pages = hpage_nr_pages(page);
 	mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
 	list_add(&page->lru, &lruvec->lists[lru]);
-	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
+	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_LRU_BASE + lru, nr_pages);
 }
 
 static __always_inline void del_page_from_lru_list(struct page *page,
@@ -37,7 +37,7 @@ static __always_inline void del_page_from_lru_list(struct page *page,
 	int nr_pages = hpage_nr_pages(page);
 	mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
 	list_del(&page->lru);
-	__mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
+	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_LRU_BASE + lru, -nr_pages);
 }
 
 /**
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 3f39d0602dbd..a9b7d3b201e1 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -118,12 +118,6 @@ enum zone_stat_item {
 	/* First 128 byte cacheline (assuming 64 bit words) */
 	NR_FREE_PAGES,
 	NR_ALLOC_BATCH,
-	NR_LRU_BASE,
-	NR_INACTIVE_ANON = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */
-	NR_ACTIVE_ANON,		/*  "     "     "   "       "         */
-	NR_INACTIVE_FILE,	/*  "     "     "   "       "         */
-	NR_ACTIVE_FILE,		/*  "     "     "   "       "         */
-	NR_UNEVICTABLE,		/*  "     "     "   "       "         */
 	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
 	NR_ANON_PAGES,	/* Mapped anonymous pages */
 	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
@@ -141,12 +135,9 @@ enum zone_stat_item {
 	NR_VMSCAN_WRITE,
 	NR_VMSCAN_IMMEDIATE,	/* Prioritise for reclaim when writeback ends */
 	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
-	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */
-	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */
 	NR_SHMEM,		/* shmem pages (included tmpfs/GEM pages) */
 	NR_DIRTIED,		/* page dirtyings since bootup */
 	NR_WRITTEN,		/* page writings since bootup */
-	NR_PAGES_SCANNED,	/* pages scanned since last reclaim */
 #ifdef CONFIG_NUMA
 	NUMA_HIT,		/* allocated in intended node */
 	NUMA_MISS,		/* allocated in non intended node */
@@ -163,6 +154,15 @@ enum zone_stat_item {
 	NR_VM_ZONE_STAT_ITEMS };
 
 enum node_stat_item {
+	NR_LRU_BASE,
+	NR_INACTIVE_ANON = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */
+	NR_ACTIVE_ANON,		/*  "     "     "   "       "         */
+	NR_INACTIVE_FILE,	/*  "     "     "   "       "         */
+	NR_ACTIVE_FILE,		/*  "     "     "   "       "         */
+	NR_UNEVICTABLE,		/*  "     "     "   "       "         */
+	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */
+	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */
+	NR_PAGES_SCANNED,	/* pages scanned since last reclaim */
 	NR_VM_NODE_STAT_ITEMS
 };
 
@@ -221,7 +221,7 @@ struct lruvec {
 	/* Evictions & activations on the inactive file list */
 	atomic_long_t			inactive_age;
 #ifdef CONFIG_MEMCG
-	struct zone			*zone;
+	struct pglist_data *pgdat;
 #endif
 };
 
@@ -359,13 +359,6 @@ struct zone {
 #ifdef CONFIG_NUMA
 	int node;
 #endif
-
-	/*
-	 * The target ratio of ACTIVE_ANON to INACTIVE_ANON pages on
-	 * this zone's LRU.  Maintained by the pageout code.
-	 */
-	unsigned int inactive_ratio;
-
 	struct pglist_data	*zone_pgdat;
 	struct per_cpu_pageset __percpu *pageset;
 
@@ -497,9 +490,6 @@ struct zone {
 
 	/* Write-intensive fields used by page reclaim */
 
-	/* Fields commonly accessed by the page reclaim scanner */
-	struct lruvec		lruvec;
-
 	/*
 	 * When free pages are below this point, additional steps are taken
 	 * when reading the number of free pages to avoid per-cpu counter
@@ -540,17 +530,20 @@ struct zone {
 enum zone_flags {
 	ZONE_RECLAIM_LOCKED,		/* prevents concurrent reclaim */
 	ZONE_OOM_LOCKED,		/* zone is in OOM killer zonelist */
-	ZONE_CONGESTED,			/* zone has many dirty pages backed by
+	ZONE_FAIR_DEPLETED,		/* fair zone policy batch depleted */
+};
+
+enum pgdat_flags {
+	PGDAT_CONGESTED,		/* zone has many dirty pages backed by
 					 * a congested BDI
 					 */
-	ZONE_DIRTY,			/* reclaim scanning has recently found
+	PGDAT_DIRTY,			/* reclaim scanning has recently found
 					 * many dirty file pages at the tail
 					 * of the LRU.
 					 */
-	ZONE_WRITEBACK,			/* reclaim scanning has recently found
+	PGDAT_WRITEBACK,		/* reclaim scanning has recently found
 					 * many pages under writeback
 					 */
-	ZONE_FAIR_DEPLETED,		/* fair zone policy batch depleted */
 };
 
 static inline unsigned long zone_end_pfn(const struct zone *zone)
@@ -704,12 +697,26 @@ typedef struct pglist_data {
 	unsigned long first_deferred_pfn;
 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
 
+
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	spinlock_t split_queue_lock;
 	struct list_head split_queue;
 	unsigned long split_queue_len;
 #endif
 
+	/* Fields commonly accessed by the page reclaim scanner */
+	struct lruvec		lruvec;
+
+	/*
+	 * The target ratio of ACTIVE_ANON to INACTIVE_ANON pages on
+	 * this node's LRU.  Maintained by the pageout code.
+	 */
+	unsigned int inactive_ratio;
+
+	unsigned long		flags;
+
+	ZONE_PADDING(_pad2_)
+
 	/* Per-node vmstats */
 	struct per_cpu_nodestat __percpu *per_cpu_nodestats;
 	atomic_long_t		vm_stat[NR_VM_NODE_STAT_ITEMS];
@@ -731,6 +738,11 @@ static inline spinlock_t *zone_lru_lock(struct zone *zone)
 	return &zone->zone_pgdat->lru_lock;
 }
 
+static inline struct lruvec *zone_lruvec(struct zone *zone)
+{
+	return &zone->zone_pgdat->lruvec;
+}
+
 static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat)
 {
 	return pgdat->node_start_pfn + pgdat->node_spanned_pages;
@@ -778,12 +790,12 @@ extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
 
 extern void lruvec_init(struct lruvec *lruvec);
 
-static inline struct zone *lruvec_zone(struct lruvec *lruvec)
+static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec)
 {
 #ifdef CONFIG_MEMCG
-	return lruvec->zone;
+	return lruvec->pgdat;
 #else
-	return container_of(lruvec, struct zone, lruvec);
+	return container_of(lruvec, struct pglist_data, lruvec);
 #endif
 }
 
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index ec084321fe09..8dcb5a813163 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -26,11 +26,11 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		PGFREE, PGACTIVATE, PGDEACTIVATE,
 		PGFAULT, PGMAJFAULT,
 		PGLAZYFREED,
-		FOR_ALL_ZONES(PGREFILL),
-		FOR_ALL_ZONES(PGSTEAL_KSWAPD),
-		FOR_ALL_ZONES(PGSTEAL_DIRECT),
-		FOR_ALL_ZONES(PGSCAN_KSWAPD),
-		FOR_ALL_ZONES(PGSCAN_DIRECT),
+		PGREFILL,
+		PGSTEAL_KSWAPD,
+		PGSTEAL_DIRECT,
+		PGSCAN_KSWAPD,
+		PGSCAN_DIRECT,
 		PGSCAN_DIRECT_THROTTLE,
 #ifdef CONFIG_NUMA
 		PGSCAN_ZONE_RECLAIM_FAILED,
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 533680126b21..8a43f7b80c20 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -178,6 +178,23 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 	return x;
 }
 
+static inline unsigned long node_page_state_snapshot(pg_data_t *pgdat,
+					enum zone_stat_item item)
+{
+	long x = atomic_long_read(&pgdat->vm_stat[item]);
+
+#ifdef CONFIG_SMP
+	int cpu;
+	for_each_online_cpu(cpu)
+		x += per_cpu_ptr(pgdat->per_cpu_nodestats, cpu)->vm_node_stat_diff[item];
+
+	if (x < 0)
+		x = 0;
+#endif
+	return x;
+}
+
+
 #ifdef CONFIG_NUMA
 extern unsigned long sum_zone_node_page_state(int node,
 						enum zone_stat_item item);
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index 0101ef37f1ee..897f1aa1ee5f 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -352,15 +352,14 @@ TRACE_EVENT(mm_vmscan_writepage,
 
 TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
 
-	TP_PROTO(struct zone *zone,
+	TP_PROTO(int nid,
 		unsigned long nr_scanned, unsigned long nr_reclaimed,
 		int priority, int file),
 
-	TP_ARGS(zone, nr_scanned, nr_reclaimed, priority, file),
+	TP_ARGS(nid, nr_scanned, nr_reclaimed, priority, file),
 
 	TP_STRUCT__entry(
 		__field(int, nid)
-		__field(int, zid)
 		__field(unsigned long, nr_scanned)
 		__field(unsigned long, nr_reclaimed)
 		__field(int, priority)
@@ -368,16 +367,15 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
 	),
 
 	TP_fast_assign(
-		__entry->nid = zone_to_nid(zone);
-		__entry->zid = zone_idx(zone);
+		__entry->nid = nid;
 		__entry->nr_scanned = nr_scanned;
 		__entry->nr_reclaimed = nr_reclaimed;
 		__entry->priority = priority;
 		__entry->reclaim_flags = trace_shrink_flags(file);
 	),
 
-	TP_printk("nid=%d zid=%d nr_scanned=%ld nr_reclaimed=%ld priority=%d flags=%s",
-		__entry->nid, __entry->zid,
+	TP_printk("nid=%d nr_scanned=%ld nr_reclaimed=%ld priority=%d flags=%s",
+		__entry->nid,
 		__entry->nr_scanned, __entry->nr_reclaimed,
 		__entry->priority,
 		show_reclaim_flags(__entry->reclaim_flags))
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 3a970604308f..24a06bc23f85 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1525,11 +1525,11 @@ static unsigned long minimum_image_size(unsigned long saveable)
 	unsigned long size;
 
 	size = global_page_state(NR_SLAB_RECLAIMABLE)
-		+ global_page_state(NR_ACTIVE_ANON)
-		+ global_page_state(NR_INACTIVE_ANON)
-		+ global_page_state(NR_ACTIVE_FILE)
-		+ global_page_state(NR_INACTIVE_FILE)
-		- global_page_state(NR_FILE_MAPPED);
+		+ global_node_page_state(NR_ACTIVE_ANON)
+		+ global_node_page_state(NR_INACTIVE_ANON)
+		+ global_node_page_state(NR_ACTIVE_FILE)
+		+ global_node_page_state(NR_INACTIVE_FILE)
+		- global_node_page_state(NR_FILE_MAPPED);
 
 	return saveable <= size ? 0 : saveable - size;
 }
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index bfbd7096b6ed..83b78932b8fd 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -947,17 +947,17 @@ long congestion_wait(int sync, long timeout)
 EXPORT_SYMBOL(congestion_wait);
 
 /**
- * wait_iff_congested - Conditionally wait for a backing_dev to become uncongested or a zone to complete writes
- * @zone: A zone to check if it is heavily congested
+ * wait_iff_congested - Conditionally wait for a backing_dev to become uncongested or a pgdat to complete writes
+ * @pgdat: A pgdat to check if it is heavily congested
  * @sync: SYNC or ASYNC IO
  * @timeout: timeout in jiffies
  *
  * In the event of a congested backing_dev (any backing_dev) and the given
- * @zone has experienced recent congestion, this waits for up to @timeout
+ * @pgdat has experienced recent congestion, this waits for up to @timeout
  * jiffies for either a BDI to exit congestion of the given @sync queue
  * or a write to complete.
  *
- * In the absence of zone congestion, a short sleep or a cond_resched is
+ * In the absence of pgdat congestion, a short sleep or a cond_resched is
  * performed to yield the processor and to allow other subsystems to make
  * a forward progress.
  *
@@ -965,7 +965,7 @@ EXPORT_SYMBOL(congestion_wait);
  * it is the number of jiffies that were still remaining when the function
  * returned. return_value == timeout implies the function did not sleep.
  */
-long wait_iff_congested(struct zone *zone, int sync, long timeout)
+long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout)
 {
 	long ret;
 	unsigned long start = jiffies;
@@ -974,11 +974,11 @@ long wait_iff_congested(struct zone *zone, int sync, long timeout)
 
 	/*
 	 * If there is no congestion, or heavy congestion is not being
-	 * encountered in the current zone, yield if necessary instead
+	 * encountered in the current pgdat, yield if necessary instead
 	 * of sleeping on the congestion queue
 	 */
 	if (atomic_read(&nr_wb_congested[sync]) == 0 ||
-	    !test_bit(ZONE_CONGESTED, &zone->flags)) {
+	    !test_bit(PGDAT_CONGESTED, &pgdat->flags)) {
 
 		/*
 		 * Memory allocation/reclaim might be called from a WQ
diff --git a/mm/compaction.c b/mm/compaction.c
index 2264b75231ba..59a7213e7915 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -590,8 +590,8 @@ static void acct_isolated(struct zone *zone, struct compact_control *cc)
 	list_for_each_entry(page, &cc->migratepages, lru)
 		count[!!page_is_file_cache(page)]++;
 
-	mod_zone_page_state(zone, NR_ISOLATED_ANON, count[0]);
-	mod_zone_page_state(zone, NR_ISOLATED_FILE, count[1]);
+	mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_ANON, count[0]);
+	mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE, count[1]);
 }
 
 /* Similar to reclaim, but different enough that they don't share logic */
@@ -599,12 +599,12 @@ static bool too_many_isolated(struct zone *zone)
 {
 	unsigned long active, inactive, isolated;
 
-	inactive = zone_page_state(zone, NR_INACTIVE_FILE) +
-					zone_page_state(zone, NR_INACTIVE_ANON);
-	active = zone_page_state(zone, NR_ACTIVE_FILE) +
-					zone_page_state(zone, NR_ACTIVE_ANON);
-	isolated = zone_page_state(zone, NR_ISOLATED_FILE) +
-					zone_page_state(zone, NR_ISOLATED_ANON);
+	inactive = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
+			node_page_state(zone->zone_pgdat, NR_INACTIVE_ANON);
+	active = node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE) +
+			node_page_state(zone->zone_pgdat, NR_ACTIVE_ANON);
+	isolated = node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE) +
+			node_page_state(zone->zone_pgdat, NR_ISOLATED_ANON);
 
 	return isolated > (inactive + active) / 2;
 }
@@ -766,7 +766,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 			}
 		}
 
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 
 		/* Try isolate the page */
 		if (__isolate_lru_page(page, isolate_mode) != 0)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index fa5865bcdfa3..6d73f1a566ae 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2006,7 +2006,7 @@ void __khugepaged_exit(struct mm_struct *mm)
 static void release_pte_page(struct page *page)
 {
 	/* 0 stands for page_is_file_cache(page) == false */
-	dec_zone_page_state(page, NR_ISOLATED_ANON + 0);
+	dec_node_page_state(page, NR_ISOLATED_ANON + 0);
 	unlock_page(page);
 	putback_lru_page(page);
 }
@@ -2101,7 +2101,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
 			goto out;
 		}
 		/* 0 stands for page_is_file_cache(page) == false */
-		inc_zone_page_state(page, NR_ISOLATED_ANON + 0);
+		inc_node_page_state(page, NR_ISOLATED_ANON + 0);
 		VM_BUG_ON_PAGE(!PageLocked(page), page);
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 
@@ -3175,7 +3175,7 @@ static void __split_huge_page(struct page *page, struct list_head *list)
 
 	/* prevent PageLRU to go away from under us, and freeze lru stats */
 	spin_lock_irq(zone_lru_lock(zone));
-	lruvec = mem_cgroup_page_lruvec(head, zone);
+	lruvec = mem_cgroup_page_lruvec(head, zone->zone_pgdat);
 
 	/* complete memcg works before add pages to LRU */
 	mem_cgroup_split_huge_fixup(head);
diff --git a/mm/internal.h b/mm/internal.h
index b79abb6721cf..1f91ce702cc5 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -75,7 +75,7 @@ extern unsigned long highest_memmap_pfn;
  */
 extern int isolate_lru_page(struct page *page);
 extern void putback_lru_page(struct page *page);
-extern bool zone_reclaimable(struct zone *zone);
+extern bool pgdat_reclaimable(struct pglist_data *pgdat);
 
 /*
  * in mm/rmap.c:
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4f597c5df207..1f4cd3063f89 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -958,7 +958,7 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
 	struct lruvec *lruvec;
 
 	if (mem_cgroup_disabled()) {
-		lruvec = &zone->lruvec;
+		lruvec = zone_lruvec(zone);
 		goto out;
 	}
 
@@ -970,8 +970,8 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
 	 * we have to be prepared to initialize lruvec->zone here;
 	 * and if offlined then reonlined, we need to reinitialize it.
 	 */
-	if (unlikely(lruvec->zone != zone))
-		lruvec->zone = zone;
+	if (unlikely(lruvec->pgdat != zone->zone_pgdat))
+		lruvec->pgdat = zone->zone_pgdat;
 	return lruvec;
 }
 
@@ -984,14 +984,14 @@ struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
  * and putback protocol: the LRU lock must be held, and the page must
  * either be PageLRU() or the caller must have isolated/allocated it.
  */
-struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone)
+struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgdat)
 {
 	struct mem_cgroup_per_zone *mz;
 	struct mem_cgroup *memcg;
 	struct lruvec *lruvec;
 
 	if (mem_cgroup_disabled()) {
-		lruvec = &zone->lruvec;
+		lruvec = &pgdat->lruvec;
 		goto out;
 	}
 
@@ -1011,8 +1011,8 @@ struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct zone *zone)
 	 * we have to be prepared to initialize lruvec->zone here;
 	 * and if offlined then reonlined, we need to reinitialize it.
 	 */
-	if (unlikely(lruvec->zone != zone))
-		lruvec->zone = zone;
+	if (unlikely(lruvec->pgdat != pgdat))
+		lruvec->pgdat = pgdat;
 	return lruvec;
 }
 
@@ -2089,7 +2089,7 @@ static void lock_page_lru(struct page *page, int *isolated)
 	if (PageLRU(page)) {
 		struct lruvec *lruvec;
 
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 		ClearPageLRU(page);
 		del_page_from_lru_list(page, lruvec, page_lru(page));
 		*isolated = 1;
@@ -2104,7 +2104,7 @@ static void unlock_page_lru(struct page *page, int isolated)
 	if (isolated) {
 		struct lruvec *lruvec;
 
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 		SetPageLRU(page);
 		add_page_to_lru_list(page, lruvec, page_lru(page));
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 5a544c6c0717..0d1b28f6578b 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1647,7 +1647,7 @@ static int __soft_offline_page(struct page *page, int flags)
 	put_hwpoison_page(page);
 	if (!ret) {
 		LIST_HEAD(pagelist);
-		inc_zone_page_state(page, NR_ISOLATED_ANON +
+		inc_node_page_state(page, NR_ISOLATED_ANON +
 					page_is_file_cache(page));
 		list_add(&page->lru, &pagelist);
 		ret = migrate_pages(&pagelist, new_page, NULL, MPOL_MF_MOVE_ALL,
@@ -1655,7 +1655,7 @@ static int __soft_offline_page(struct page *page, int flags)
 		if (ret) {
 			if (!list_empty(&pagelist)) {
 				list_del(&page->lru);
-				dec_zone_page_state(page, NR_ISOLATED_ANON +
+				dec_node_page_state(page, NR_ISOLATED_ANON +
 						page_is_file_cache(page));
 				putback_lru_page(page);
 			}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index aa34431c3f31..372f1099fc8f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1525,7 +1525,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 			put_page(page);
 			list_add_tail(&page->lru, &source);
 			move_pages--;
-			inc_zone_page_state(page, NR_ISOLATED_ANON +
+			inc_node_page_state(page, NR_ISOLATED_ANON +
 					    page_is_file_cache(page));
 
 		} else {
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 36cc01bc950a..0a4c583b00e3 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -963,7 +963,7 @@ static void migrate_page_add(struct page *page, struct list_head *pagelist,
 	if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) {
 		if (!isolate_lru_page(page)) {
 			list_add_tail(&page->lru, pagelist);
-			inc_zone_page_state(page, NR_ISOLATED_ANON +
+			inc_node_page_state(page, NR_ISOLATED_ANON +
 					    page_is_file_cache(page));
 		}
 	}
diff --git a/mm/migrate.c b/mm/migrate.c
index 6c822a7b27e0..53bb33c570bf 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -92,7 +92,7 @@ void putback_movable_pages(struct list_head *l)
 			continue;
 		}
 		list_del(&page->lru);
-		dec_zone_page_state(page, NR_ISOLATED_ANON +
+		dec_node_page_state(page, NR_ISOLATED_ANON +
 				page_is_file_cache(page));
 		if (unlikely(isolated_balloon_page(page)))
 			balloon_page_putback(page);
@@ -972,7 +972,7 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page,
 		 * restored.
 		 */
 		list_del(&page->lru);
-		dec_zone_page_state(page, NR_ISOLATED_ANON +
+		dec_node_page_state(page, NR_ISOLATED_ANON +
 				page_is_file_cache(page));
 		/* Soft-offlined page shouldn't go through lru cache list */
 		if (reason == MR_MEMORY_FAILURE) {
@@ -1294,7 +1294,7 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
 		err = isolate_lru_page(page);
 		if (!err) {
 			list_add_tail(&page->lru, &pagelist);
-			inc_zone_page_state(page, NR_ISOLATED_ANON +
+			inc_node_page_state(page, NR_ISOLATED_ANON +
 					    page_is_file_cache(page));
 		}
 put_and_set:
@@ -1560,15 +1560,16 @@ static bool migrate_balanced_pgdat(struct pglist_data *pgdat,
 				   unsigned long nr_migrate_pages)
 {
 	int z;
+
+	if (!pgdat_reclaimable(pgdat))
+		return false;
+
 	for (z = pgdat->nr_zones - 1; z >= 0; z--) {
 		struct zone *zone = pgdat->node_zones + z;
 
 		if (!populated_zone(zone))
 			continue;
 
-		if (!zone_reclaimable(zone))
-			continue;
-
 		/* Avoid waking kswapd by allocating pages_to_migrate pages. */
 		if (!zone_watermark_ok(zone, 0,
 				       high_wmark_pages(zone) +
@@ -1662,7 +1663,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
 	}
 
 	page_lru = page_is_file_cache(page);
-	mod_zone_page_state(page_zone(page), NR_ISOLATED_ANON + page_lru,
+	mod_node_page_state(page_zone(page)->zone_pgdat, NR_ISOLATED_ANON + page_lru,
 				hpage_nr_pages(page));
 
 	/*
@@ -1720,7 +1721,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
 	if (nr_remaining) {
 		if (!list_empty(&migratepages)) {
 			list_del(&page->lru);
-			dec_zone_page_state(page, NR_ISOLATED_ANON +
+			dec_node_page_state(page, NR_ISOLATED_ANON +
 					page_is_file_cache(page));
 			putback_lru_page(page);
 		}
@@ -1813,7 +1814,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 		/* Retake the callers reference and putback on LRU */
 		get_page(page);
 		putback_lru_page(page);
-		mod_zone_page_state(page_zone(page),
+		mod_node_page_state(page_zone(page)->zone_pgdat,
 			 NR_ISOLATED_ANON + page_lru, -HPAGE_PMD_NR);
 
 		goto out_unlock;
@@ -1865,7 +1866,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 	count_vm_events(PGMIGRATE_SUCCESS, HPAGE_PMD_NR);
 	count_vm_numa_events(NUMA_PAGE_MIGRATE, HPAGE_PMD_NR);
 
-	mod_zone_page_state(page_zone(page),
+	mod_node_page_state(page_zone(page)->zone_pgdat,
 			NR_ISOLATED_ANON + page_lru,
 			-HPAGE_PMD_NR);
 	return isolated;
diff --git a/mm/mlock.c b/mm/mlock.c
index ce7dabd53e7e..40156665ccf0 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -103,7 +103,7 @@ static bool __munlock_isolate_lru_page(struct page *page, bool getpage)
 	if (PageLRU(page)) {
 		struct lruvec *lruvec;
 
-		lruvec = mem_cgroup_page_lruvec(page, page_zone(page));
+		lruvec = mem_cgroup_page_lruvec(page, page_zone(page)->zone_pgdat);
 		if (getpage)
 			get_page(page);
 		ClearPageLRU(page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 11ff8f758631..b0960ec94bc9 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -285,8 +285,8 @@ static unsigned long zone_dirtyable_memory(struct zone *zone)
 	 */
 	nr_pages -= min(nr_pages, zone->totalreserve_pages);
 
-	nr_pages += zone_page_state(zone, NR_INACTIVE_FILE);
-	nr_pages += zone_page_state(zone, NR_ACTIVE_FILE);
+	nr_pages += node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE);
+	nr_pages += node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
 
 	return nr_pages;
 }
@@ -344,8 +344,8 @@ static unsigned long global_dirtyable_memory(void)
 	 */
 	x -= min(x, totalreserve_pages);
 
-	x += global_page_state(NR_INACTIVE_FILE);
-	x += global_page_state(NR_ACTIVE_FILE);
+	x += global_node_page_state(NR_INACTIVE_FILE);
+	x += global_node_page_state(NR_ACTIVE_FILE);
 
 	if (!vm_highmem_is_dirtyable)
 		x -= highmem_dirtyable_memory(x);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index dbbd36cbe839..50170f4b6b42 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -833,9 +833,9 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 	unsigned long nr_scanned;
 
 	spin_lock(&zone->lock);
-	nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
+	nr_scanned = node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED);
 	if (nr_scanned)
-		__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
+		__mod_node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED, -nr_scanned);
 
 	while (to_free) {
 		struct page *page;
@@ -887,9 +887,9 @@ static void free_one_page(struct zone *zone,
 {
 	unsigned long nr_scanned;
 	spin_lock(&zone->lock);
-	nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
+	nr_scanned = node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED);
 	if (nr_scanned)
-		__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
+		__mod_node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED, -nr_scanned);
 
 	if (unlikely(has_isolate_pageblock(zone) ||
 		is_migrate_isolate(migratetype))) {
@@ -3278,7 +3278,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
 	if ((did_some_progress && order <= PAGE_ALLOC_COSTLY_ORDER) ||
 	    ((gfp_mask & __GFP_REPEAT) && pages_reclaimed < (1 << order))) {
 		/* Wait for some write requests to complete then retry */
-		wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, HZ/50);
+		wait_iff_congested(ac->preferred_zone->zone_pgdat, BLK_RW_ASYNC, HZ/50);
 		goto retry;
 	}
 
@@ -3872,6 +3872,7 @@ void show_free_areas(unsigned int filter)
 	unsigned long free_pcp = 0;
 	int cpu;
 	struct zone *zone;
+	pg_data_t *pgdat;
 
 	for_each_populated_zone(zone) {
 		if (skip_free_areas_node(filter, zone_to_nid(zone)))
@@ -3887,13 +3888,13 @@ void show_free_areas(unsigned int filter)
 		" slab_reclaimable:%lu slab_unreclaimable:%lu\n"
 		" mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n"
 		" free:%lu free_pcp:%lu free_cma:%lu\n",
-		global_page_state(NR_ACTIVE_ANON),
-		global_page_state(NR_INACTIVE_ANON),
-		global_page_state(NR_ISOLATED_ANON),
-		global_page_state(NR_ACTIVE_FILE),
-		global_page_state(NR_INACTIVE_FILE),
-		global_page_state(NR_ISOLATED_FILE),
-		global_page_state(NR_UNEVICTABLE),
+		global_node_page_state(NR_ACTIVE_ANON),
+		global_node_page_state(NR_INACTIVE_ANON),
+		global_node_page_state(NR_ISOLATED_ANON),
+		global_node_page_state(NR_ACTIVE_FILE),
+		global_node_page_state(NR_INACTIVE_FILE),
+		global_node_page_state(NR_ISOLATED_FILE),
+		global_node_page_state(NR_UNEVICTABLE),
 		global_page_state(NR_FILE_DIRTY),
 		global_page_state(NR_WRITEBACK),
 		global_page_state(NR_UNSTABLE_NFS),
@@ -3907,6 +3908,28 @@ void show_free_areas(unsigned int filter)
 		free_pcp,
 		global_page_state(NR_FREE_CMA_PAGES));
 
+	for_each_online_pgdat(pgdat) {
+		printk("Node %d"
+			" active_anon:%lukB"
+			" inactive_anon:%lukB"
+			" active_file:%lukB"
+			" inactive_file:%lukB"
+			" unevictable:%lukB"
+			" isolated(anon):%lukB"
+			" isolated(file):%lukB"
+			" all_unreclaimable? %s"
+			"\n",
+			pgdat->node_id,
+			K(node_page_state(pgdat, NR_ACTIVE_ANON)),
+			K(node_page_state(pgdat, NR_INACTIVE_ANON)),
+			K(node_page_state(pgdat, NR_ACTIVE_FILE)),
+			K(node_page_state(pgdat, NR_INACTIVE_FILE)),
+			K(node_page_state(pgdat, NR_UNEVICTABLE)),
+			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
+			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
+			!pgdat_reclaimable(pgdat) ? "yes" : "no");
+	}
+
 	for_each_populated_zone(zone) {
 		int i;
 
@@ -3923,13 +3946,6 @@ void show_free_areas(unsigned int filter)
 			" min:%lukB"
 			" low:%lukB"
 			" high:%lukB"
-			" active_anon:%lukB"
-			" inactive_anon:%lukB"
-			" active_file:%lukB"
-			" inactive_file:%lukB"
-			" unevictable:%lukB"
-			" isolated(anon):%lukB"
-			" isolated(file):%lukB"
 			" present:%lukB"
 			" managed:%lukB"
 			" mlocked:%lukB"
@@ -3947,21 +3963,13 @@ void show_free_areas(unsigned int filter)
 			" local_pcp:%ukB"
 			" free_cma:%lukB"
 			" writeback_tmp:%lukB"
-			" pages_scanned:%lu"
-			" all_unreclaimable? %s"
+			" node_pages_scanned:%lu"
 			"\n",
 			zone->name,
 			K(zone_page_state(zone, NR_FREE_PAGES)),
 			K(min_wmark_pages(zone)),
 			K(low_wmark_pages(zone)),
 			K(high_wmark_pages(zone)),
-			K(zone_page_state(zone, NR_ACTIVE_ANON)),
-			K(zone_page_state(zone, NR_INACTIVE_ANON)),
-			K(zone_page_state(zone, NR_ACTIVE_FILE)),
-			K(zone_page_state(zone, NR_INACTIVE_FILE)),
-			K(zone_page_state(zone, NR_UNEVICTABLE)),
-			K(zone_page_state(zone, NR_ISOLATED_ANON)),
-			K(zone_page_state(zone, NR_ISOLATED_FILE)),
 			K(zone->present_pages),
 			K(zone->managed_pages),
 			K(zone_page_state(zone, NR_MLOCK)),
@@ -3980,9 +3988,7 @@ void show_free_areas(unsigned int filter)
 			K(this_cpu_read(zone->pageset->pcp.count)),
 			K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
 			K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
-			K(zone_page_state(zone, NR_PAGES_SCANNED)),
-			(!zone_reclaimable(zone) ? "yes" : "no")
-			);
+			K(node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED)));
 		printk("lowmem_reserve[]:");
 		for (i = 0; i < MAX_NR_ZONES; i++)
 			printk(" %ld", zone->lowmem_reserve[i]);
@@ -5533,7 +5539,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 		/* For bootup, initialized properly in watermark setup */
 		mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages);
 
-		lruvec_init(&zone->lruvec);
+		lruvec_init(zone_lruvec(zone));
 		if (!size)
 			continue;
 
@@ -6421,26 +6427,37 @@ void setup_per_zone_wmarks(void)
  *    1TB     101        10GB
  *   10TB     320        32GB
  */
-static void __meminit calculate_zone_inactive_ratio(struct zone *zone)
+static void __meminit calculate_node_inactive_ratio(struct pglist_data *pgdat)
 {
 	unsigned int gb, ratio;
+	int z;
+	unsigned long managed_pages = 0;
+
+	for (z = 0; z < MAX_NR_ZONES; z++) {
+		struct zone *zone = &pgdat->node_zones[z];
 
-	/* Zone size in gigabytes */
-	gb = zone->managed_pages >> (30 - PAGE_SHIFT);
+		if (!populated_zone(zone))
+			continue;
+
+		managed_pages += zone->managed_pages;
+	}
+
+	/* Node size in gigabytes */
+	gb = managed_pages >> (30 - PAGE_SHIFT);
 	if (gb)
 		ratio = int_sqrt(10 * gb);
 	else
 		ratio = 1;
 
-	zone->inactive_ratio = ratio;
+	pgdat->inactive_ratio = ratio;
 }
 
-static void __meminit setup_per_zone_inactive_ratio(void)
+static void __meminit setup_per_node_inactive_ratio(void)
 {
-	struct zone *zone;
+	struct pglist_data *pgdat;
 
-	for_each_zone(zone)
-		calculate_zone_inactive_ratio(zone);
+	for_each_online_pgdat(pgdat)
+		calculate_node_inactive_ratio(pgdat);
 }
 
 /*
@@ -6488,7 +6505,7 @@ int __meminit init_per_zone_wmark_min(void)
 	setup_per_zone_wmarks();
 	refresh_zone_stat_thresholds();
 	setup_per_zone_lowmem_reserve();
-	setup_per_zone_inactive_ratio();
+	setup_per_node_inactive_ratio();
 	return 0;
 }
 module_init(init_per_zone_wmark_min)
diff --git a/mm/swap.c b/mm/swap.c
index 4067911033e1..83d3fbd03316 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -60,7 +60,7 @@ static void __page_cache_release(struct page *page)
 		unsigned long flags;
 
 		spin_lock_irqsave(zone_lru_lock(zone), flags);
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 		VM_BUG_ON_PAGE(!PageLRU(page), page);
 		__ClearPageLRU(page);
 		del_page_from_lru_list(page, lruvec, page_off_lru(page));
@@ -191,7 +191,7 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
 			spin_lock_irqsave(zone_lru_lock(zone), flags);
 		}
 
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 		(*move_fn)(page, lruvec, arg);
 	}
 	if (zone)
@@ -313,11 +313,11 @@ static bool need_activate_page_drain(int cpu)
 
 void activate_page(struct page *page)
 {
-	struct zone *zone = page_zone(page);
+	struct pglist_data *pgdat = page_zone(page)->zone_pgdat;
 
-	spin_lock_irq(zone_lru_lock(zone));
-	__activate_page(page, mem_cgroup_page_lruvec(page, zone), NULL);
-	spin_unlock_irq(zone_lru_lock(zone));
+	spin_lock_irq(&pgdat->lru_lock);
+	__activate_page(page, mem_cgroup_page_lruvec(page, pgdat), NULL);
+	spin_unlock_irq(&pgdat->lru_lock);
 }
 #endif
 
@@ -443,16 +443,16 @@ void lru_cache_add(struct page *page)
  */
 void add_page_to_unevictable_list(struct page *page)
 {
-	struct zone *zone = page_zone(page);
+	struct pglist_data *pgdat = page_zone(page)->zone_pgdat;
 	struct lruvec *lruvec;
 
-	spin_lock_irq(zone_lru_lock(zone));
-	lruvec = mem_cgroup_page_lruvec(page, zone);
+	spin_lock_irq(&pgdat->lru_lock);
+	lruvec = mem_cgroup_page_lruvec(page, pgdat);
 	ClearPageActive(page);
 	SetPageUnevictable(page);
 	SetPageLRU(page);
 	add_page_to_lru_list(page, lruvec, LRU_UNEVICTABLE);
-	spin_unlock_irq(zone_lru_lock(zone));
+	spin_unlock_irq(&pgdat->lru_lock);
 }
 
 /**
@@ -710,7 +710,7 @@ void release_pages(struct page **pages, int nr, bool cold)
 {
 	int i;
 	LIST_HEAD(pages_to_free);
-	struct zone *zone = NULL;
+	struct pglist_data *pgdat = NULL;
 	struct lruvec *lruvec;
 	unsigned long uninitialized_var(flags);
 	unsigned int uninitialized_var(lock_batch);
@@ -721,11 +721,11 @@ void release_pages(struct page **pages, int nr, bool cold)
 		/*
 		 * Make sure the IRQ-safe lock-holding time does not get
 		 * excessive with a continuous string of pages from the
-		 * same zone. The lock is held only if zone != NULL.
+		 * same pgdat. The lock is held only if pgdat != NULL.
 		 */
-		if (zone && ++lock_batch == SWAP_CLUSTER_MAX) {
-			spin_unlock_irqrestore(zone_lru_lock(zone), flags);
-			zone = NULL;
+		if (pgdat && ++lock_batch == SWAP_CLUSTER_MAX) {
+			spin_unlock_irqrestore(&pgdat->lru_lock, flags);
+			pgdat = NULL;
 		}
 
 		page = compound_head(page);
@@ -733,27 +733,27 @@ void release_pages(struct page **pages, int nr, bool cold)
 			continue;
 
 		if (PageCompound(page)) {
-			if (zone) {
-				spin_unlock_irqrestore(zone_lru_lock(zone), flags);
-				zone = NULL;
+			if (pgdat) {
+				spin_unlock_irqrestore(&pgdat->lru_lock, flags);
+				pgdat = NULL;
 			}
 			__put_compound_page(page);
 			continue;
 		}
 
 		if (PageLRU(page)) {
-			struct zone *pagezone = page_zone(page);
+			struct pglist_data *page_pgdat = page_zone(page)->zone_pgdat;
 
-			if (pagezone != zone) {
-				if (zone)
-					spin_unlock_irqrestore(zone_lru_lock(zone),
+			if (page_pgdat != pgdat) {
+				if (pgdat)
+					spin_unlock_irqrestore(&pgdat->lru_lock,
 									flags);
 				lock_batch = 0;
-				zone = pagezone;
-				spin_lock_irqsave(zone_lru_lock(zone), flags);
+				pgdat = page_pgdat;
+				spin_lock_irqsave(&pgdat->lru_lock, flags);
 			}
 
-			lruvec = mem_cgroup_page_lruvec(page, zone);
+			lruvec = mem_cgroup_page_lruvec(page, pgdat);
 			VM_BUG_ON_PAGE(!PageLRU(page), page);
 			__ClearPageLRU(page);
 			del_page_from_lru_list(page, lruvec, page_off_lru(page));
@@ -764,8 +764,8 @@ void release_pages(struct page **pages, int nr, bool cold)
 
 		list_add(&page->lru, &pages_to_free);
 	}
-	if (zone)
-		spin_unlock_irqrestore(zone_lru_lock(zone), flags);
+	if (pgdat)
+		spin_unlock_irqrestore(&pgdat->lru_lock, flags);
 
 	mem_cgroup_uncharge_list(&pages_to_free);
 	free_hot_cold_page_list(&pages_to_free, cold);
@@ -801,7 +801,7 @@ void lru_add_page_tail(struct page *page, struct page *page_tail,
 	VM_BUG_ON_PAGE(PageCompound(page_tail), page);
 	VM_BUG_ON_PAGE(PageLRU(page_tail), page);
 	VM_BUG_ON(NR_CPUS != 1 &&
-		  !spin_is_locked(zone_lru_lock(lruvec_zone(lruvec))));
+		  !spin_is_locked(&lruvec_pgdat(lruvec)->lru_lock));
 
 	if (!list)
 		SetPageLRU(page_tail);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2148c795328e..75acb89c9df5 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -191,26 +191,26 @@ static bool sane_reclaim(struct scan_control *sc)
 }
 #endif
 
-static unsigned long zone_reclaimable_pages(struct zone *zone)
+static unsigned long pgdat_reclaimable_pages(struct pglist_data *pgdat)
 {
 	unsigned long nr;
 
-	nr = zone_page_state_snapshot(zone, NR_ACTIVE_FILE) +
-	     zone_page_state_snapshot(zone, NR_INACTIVE_FILE) +
-	     zone_page_state_snapshot(zone, NR_ISOLATED_FILE);
+	nr = node_page_state_snapshot(pgdat, NR_ACTIVE_FILE) +
+	     node_page_state_snapshot(pgdat, NR_INACTIVE_FILE) +
+	     node_page_state_snapshot(pgdat, NR_ISOLATED_FILE);
 
 	if (get_nr_swap_pages() > 0)
-		nr += zone_page_state_snapshot(zone, NR_ACTIVE_ANON) +
-		      zone_page_state_snapshot(zone, NR_INACTIVE_ANON) +
-		      zone_page_state_snapshot(zone, NR_ISOLATED_ANON);
+		nr += node_page_state_snapshot(pgdat, NR_ACTIVE_ANON) +
+		      node_page_state_snapshot(pgdat, NR_INACTIVE_ANON) +
+		      node_page_state_snapshot(pgdat, NR_ISOLATED_ANON);
 
 	return nr;
 }
 
-bool zone_reclaimable(struct zone *zone)
+bool pgdat_reclaimable(struct pglist_data *pgdat)
 {
-	return zone_page_state_snapshot(zone, NR_PAGES_SCANNED) <
-		zone_reclaimable_pages(zone) * 6;
+	return node_page_state_snapshot(pgdat, NR_PAGES_SCANNED) <
+		pgdat_reclaimable_pages(pgdat) * 6;
 }
 
 unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru)
@@ -218,7 +218,7 @@ unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru)
 	if (!mem_cgroup_disabled())
 		return mem_cgroup_get_lru_size(lruvec, lru);
 
-	return zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru);
+	return node_page_state(lruvec_pgdat(lruvec), NR_LRU_BASE + lru);
 }
 
 /*
@@ -877,7 +877,7 @@ static void page_check_dirty_writeback(struct page *page,
  * shrink_page_list() returns the number of reclaimed pages
  */
 static unsigned long shrink_page_list(struct list_head *page_list,
-				      struct zone *zone,
+				      struct pglist_data *pgdat,
 				      struct scan_control *sc,
 				      enum ttu_flags ttu_flags,
 				      unsigned long *ret_nr_dirty,
@@ -917,7 +917,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 			goto keep;
 
 		VM_BUG_ON_PAGE(PageActive(page), page);
-		VM_BUG_ON_PAGE(page_zone(page) != zone, page);
 
 		sc->nr_scanned++;
 
@@ -996,7 +995,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 			/* Case 1 above */
 			if (current_is_kswapd() &&
 			    PageReclaim(page) &&
-			    test_bit(ZONE_WRITEBACK, &zone->flags)) {
+			    test_bit(PGDAT_WRITEBACK, &pgdat->flags)) {
 				nr_immediate++;
 				goto keep_locked;
 
@@ -1086,7 +1085,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 			 */
 			if (page_is_file_cache(page) &&
 					(!current_is_kswapd() ||
-					 !test_bit(ZONE_DIRTY, &zone->flags))) {
+					 !test_bit(PGDAT_DIRTY, &pgdat->flags))) {
 				/*
 				 * Immediately reclaim when written back.
 				 * Similar in principal to deactivate_page()
@@ -1260,11 +1259,11 @@ unsigned long reclaim_clean_pages_from_list(struct zone *zone,
 		}
 	}
 
-	ret = shrink_page_list(&clean_pages, zone, &sc,
+	ret = shrink_page_list(&clean_pages, zone->zone_pgdat, &sc,
 			TTU_UNMAP|TTU_IGNORE_ACCESS,
 			&dummy1, &dummy2, &dummy3, &dummy4, &dummy5, true);
 	list_splice(&clean_pages, page_list);
-	mod_zone_page_state(zone, NR_ISOLATED_FILE, -ret);
+	mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE, -ret);
 	return ret;
 }
 
@@ -1442,7 +1441,7 @@ int isolate_lru_page(struct page *page)
 		struct lruvec *lruvec;
 
 		spin_lock_irq(zone_lru_lock(zone));
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 		if (PageLRU(page)) {
 			int lru = page_lru(page);
 			get_page(page);
@@ -1462,7 +1461,7 @@ int isolate_lru_page(struct page *page)
  * the LRU list will go small and be scanned faster than necessary, leading to
  * unnecessary swapping, thrashing and OOM.
  */
-static int too_many_isolated(struct zone *zone, int file,
+static int too_many_isolated(struct pglist_data *pgdat, int file,
 		struct scan_control *sc)
 {
 	unsigned long inactive, isolated;
@@ -1474,11 +1473,11 @@ static int too_many_isolated(struct zone *zone, int file,
 		return 0;
 
 	if (file) {
-		inactive = zone_page_state(zone, NR_INACTIVE_FILE);
-		isolated = zone_page_state(zone, NR_ISOLATED_FILE);
+		inactive = node_page_state(pgdat, NR_INACTIVE_FILE);
+		isolated = node_page_state(pgdat, NR_ISOLATED_FILE);
 	} else {
-		inactive = zone_page_state(zone, NR_INACTIVE_ANON);
-		isolated = zone_page_state(zone, NR_ISOLATED_ANON);
+		inactive = node_page_state(pgdat, NR_INACTIVE_ANON);
+		isolated = node_page_state(pgdat, NR_ISOLATED_ANON);
 	}
 
 	/*
@@ -1496,7 +1495,7 @@ static noinline_for_stack void
 putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 {
 	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
-	struct zone *zone = lruvec_zone(lruvec);
+	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 	LIST_HEAD(pages_to_free);
 
 	/*
@@ -1509,13 +1508,13 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 		list_del(&page->lru);
 		if (unlikely(!page_evictable(page))) {
-			spin_unlock_irq(zone_lru_lock(zone));
+			spin_unlock_irq(&pgdat->lru_lock);
 			putback_lru_page(page);
-			spin_lock_irq(zone_lru_lock(zone));
+			spin_lock_irq(&pgdat->lru_lock);
 			continue;
 		}
 
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, pgdat);
 
 		SetPageLRU(page);
 		lru = page_lru(page);
@@ -1532,10 +1531,10 @@ putback_inactive_pages(struct lruvec *lruvec, struct list_head *page_list)
 			del_page_from_lru_list(page, lruvec, lru);
 
 			if (unlikely(PageCompound(page))) {
-				spin_unlock_irq(zone_lru_lock(zone));
+				spin_unlock_irq(&pgdat->lru_lock);
 				mem_cgroup_uncharge(page);
 				(*get_compound_page_dtor(page))(page);
-				spin_lock_irq(zone_lru_lock(zone));
+				spin_lock_irq(&pgdat->lru_lock);
 			} else
 				list_add(&page->lru, &pages_to_free);
 		}
@@ -1579,10 +1578,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	unsigned long nr_immediate = 0;
 	isolate_mode_t isolate_mode = 0;
 	int file = is_file_lru(lru);
-	struct zone *zone = lruvec_zone(lruvec);
+	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
 
-	while (unlikely(too_many_isolated(zone, file, sc))) {
+	while (unlikely(too_many_isolated(pgdat, file, sc))) {
 		congestion_wait(BLK_RW_ASYNC, HZ/10);
 
 		/* We are about to die and free our memory. Return now. */
@@ -1597,49 +1596,47 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	if (!sc->may_writepage)
 		isolate_mode |= ISOLATE_CLEAN;
 
-	spin_lock_irq(zone_lru_lock(zone));
+	spin_lock_irq(&pgdat->lru_lock);
 
 	nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list,
 				     &nr_scanned, sc, isolate_mode, lru);
 
-	__mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken);
-	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
+	__mod_node_page_state(pgdat, NR_LRU_BASE + lru, -nr_taken);
+	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, nr_taken);
 
 	if (global_reclaim(sc)) {
-		__mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned);
+		__mod_node_page_state(pgdat, NR_PAGES_SCANNED, nr_scanned);
 		if (current_is_kswapd())
-			__count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scanned);
+			__count_vm_events(PGSCAN_KSWAPD, nr_scanned);
 		else
-			__count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scanned);
+			__count_vm_events(PGSCAN_DIRECT, nr_scanned);
 	}
-	spin_unlock_irq(zone_lru_lock(zone));
+	spin_unlock_irq(&pgdat->lru_lock);
 
 	if (nr_taken == 0)
 		return 0;
 
-	nr_reclaimed = shrink_page_list(&page_list, zone, sc, TTU_UNMAP,
+	nr_reclaimed = shrink_page_list(&page_list, pgdat, sc, TTU_UNMAP,
 				&nr_dirty, &nr_unqueued_dirty, &nr_congested,
 				&nr_writeback, &nr_immediate,
 				false);
 
-	spin_lock_irq(zone_lru_lock(zone));
+	spin_lock_irq(&pgdat->lru_lock);
 
 	reclaim_stat->recent_scanned[file] += nr_taken;
 
 	if (global_reclaim(sc)) {
 		if (current_is_kswapd())
-			__count_zone_vm_events(PGSTEAL_KSWAPD, zone,
-					       nr_reclaimed);
+			__count_vm_events(PGSTEAL_KSWAPD, nr_reclaimed);
 		else
-			__count_zone_vm_events(PGSTEAL_DIRECT, zone,
-					       nr_reclaimed);
+			__count_vm_events(PGSTEAL_DIRECT, nr_reclaimed);
 	}
 
 	putback_inactive_pages(lruvec, &page_list);
 
-	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
+	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
 
-	spin_unlock_irq(zone_lru_lock(zone));
+	spin_unlock_irq(&pgdat->lru_lock);
 
 	mem_cgroup_uncharge_list(&page_list);
 	free_hot_cold_page_list(&page_list, true);
@@ -1659,7 +1656,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	 * are encountered in the nr_immediate check below.
 	 */
 	if (nr_writeback && nr_writeback == nr_taken)
-		set_bit(ZONE_WRITEBACK, &zone->flags);
+		set_bit(PGDAT_WRITEBACK, &pgdat->flags);
 
 	/*
 	 * Legacy memcg will stall in page writeback so avoid forcibly
@@ -1671,16 +1668,16 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 		 * backed by a congested BDI and wait_iff_congested will stall.
 		 */
 		if (nr_dirty && nr_dirty == nr_congested)
-			set_bit(ZONE_CONGESTED, &zone->flags);
+			set_bit(PGDAT_CONGESTED, &pgdat->flags);
 
 		/*
 		 * If dirty pages are scanned that are not queued for IO, it
 		 * implies that flushers are not keeping up. In this case, flag
-		 * the zone ZONE_DIRTY and kswapd will start writing pages from
+		 * the pgdat PGDAT_DIRTY and kswapd will start writing pages from
 		 * reclaim context.
 		 */
 		if (nr_unqueued_dirty == nr_taken)
-			set_bit(ZONE_DIRTY, &zone->flags);
+			set_bit(PGDAT_DIRTY, &pgdat->flags);
 
 		/*
 		 * If kswapd scans pages marked marked for immediate
@@ -1699,9 +1696,10 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	 */
 	if (!sc->hibernation_mode && !current_is_kswapd() &&
 	    current_may_throttle())
-		wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
+		wait_iff_congested(pgdat, BLK_RW_ASYNC, HZ/10);
 
-	trace_mm_vmscan_lru_shrink_inactive(zone, nr_scanned, nr_reclaimed,
+	trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id,
+			nr_scanned, nr_reclaimed,
 			sc->priority, file);
 	return nr_reclaimed;
 }
@@ -1729,14 +1727,14 @@ static void move_active_pages_to_lru(struct lruvec *lruvec,
 				     struct list_head *pages_to_free,
 				     enum lru_list lru)
 {
-	struct zone *zone = lruvec_zone(lruvec);
+	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 	unsigned long pgmoved = 0;
 	struct page *page;
 	int nr_pages;
 
 	while (!list_empty(list)) {
 		page = lru_to_page(list);
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, pgdat);
 
 		VM_BUG_ON_PAGE(PageLRU(page), page);
 		SetPageLRU(page);
@@ -1752,15 +1750,15 @@ static void move_active_pages_to_lru(struct lruvec *lruvec,
 			del_page_from_lru_list(page, lruvec, lru);
 
 			if (unlikely(PageCompound(page))) {
-				spin_unlock_irq(zone_lru_lock(zone));
+				spin_unlock_irq(&pgdat->lru_lock);
 				mem_cgroup_uncharge(page);
 				(*get_compound_page_dtor(page))(page);
-				spin_lock_irq(zone_lru_lock(zone));
+				spin_lock_irq(&pgdat->lru_lock);
 			} else
 				list_add(&page->lru, pages_to_free);
 		}
 	}
-	__mod_zone_page_state(zone, NR_LRU_BASE + lru, pgmoved);
+	__mod_node_page_state(pgdat, NR_LRU_BASE + lru, pgmoved);
 	if (!is_active_lru(lru))
 		__count_vm_events(PGDEACTIVATE, pgmoved);
 }
@@ -1781,7 +1779,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	unsigned long nr_rotated = 0;
 	isolate_mode_t isolate_mode = 0;
 	int file = is_file_lru(lru);
-	struct zone *zone = lruvec_zone(lruvec);
+	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 
 	lru_add_drain();
 
@@ -1790,19 +1788,19 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	if (!sc->may_writepage)
 		isolate_mode |= ISOLATE_CLEAN;
 
-	spin_lock_irq(zone_lru_lock(zone));
+	spin_lock_irq(&pgdat->lru_lock);
 
 	nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
 				     &nr_scanned, sc, isolate_mode, lru);
 	if (global_reclaim(sc))
-		__mod_zone_page_state(zone, NR_PAGES_SCANNED, nr_scanned);
+		__mod_node_page_state(pgdat, NR_PAGES_SCANNED, nr_scanned);
 
 	reclaim_stat->recent_scanned[file] += nr_taken;
 
-	__count_zone_vm_events(PGREFILL, zone, nr_scanned);
-	__mod_zone_page_state(zone, NR_LRU_BASE + lru, -nr_taken);
-	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, nr_taken);
-	spin_unlock_irq(zone_lru_lock(zone));
+	__count_vm_events(PGREFILL, nr_scanned);
+	__mod_node_page_state(pgdat, NR_LRU_BASE + lru, -nr_taken);
+	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, nr_taken);
+	spin_unlock_irq(&pgdat->lru_lock);
 
 	while (!list_empty(&l_hold)) {
 		cond_resched();
@@ -1847,7 +1845,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	/*
 	 * Move pages back to the lru list.
 	 */
-	spin_lock_irq(zone_lru_lock(zone));
+	spin_lock_irq(&pgdat->lru_lock);
 	/*
 	 * Count referenced pages from currently used mappings as rotated,
 	 * even though only some of them are actually re-activated.  This
@@ -1858,22 +1856,22 @@ static void shrink_active_list(unsigned long nr_to_scan,
 
 	move_active_pages_to_lru(lruvec, &l_active, &l_hold, lru);
 	move_active_pages_to_lru(lruvec, &l_inactive, &l_hold, lru - LRU_ACTIVE);
-	__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
-	spin_unlock_irq(zone_lru_lock(zone));
+	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
+	spin_unlock_irq(&pgdat->lru_lock);
 
 	mem_cgroup_uncharge_list(&l_hold);
 	free_hot_cold_page_list(&l_hold, true);
 }
 
 #ifdef CONFIG_SWAP
-static bool inactive_anon_is_low_global(struct zone *zone)
+static bool inactive_anon_is_low_global(struct pglist_data *pgdat)
 {
 	unsigned long active, inactive;
 
-	active = zone_page_state(zone, NR_ACTIVE_ANON);
-	inactive = zone_page_state(zone, NR_INACTIVE_ANON);
+	active = node_page_state(pgdat, NR_ACTIVE_ANON);
+	inactive = node_page_state(pgdat, NR_INACTIVE_ANON);
 
-	return inactive * zone->inactive_ratio < active;
+	return inactive * pgdat->inactive_ratio < active;
 }
 
 /**
@@ -1895,7 +1893,7 @@ static bool inactive_anon_is_low(struct lruvec *lruvec)
 	if (!mem_cgroup_disabled())
 		return mem_cgroup_inactive_anon_is_low(lruvec);
 
-	return inactive_anon_is_low_global(lruvec_zone(lruvec));
+	return inactive_anon_is_low_global(lruvec_pgdat(lruvec));
 }
 #else
 static inline bool inactive_anon_is_low(struct lruvec *lruvec)
@@ -1973,7 +1971,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
 	u64 fraction[2];
 	u64 denominator = 0;	/* gcc */
-	struct zone *zone = lruvec_zone(lruvec);
+	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 	unsigned long anon_prio, file_prio;
 	enum scan_balance scan_balance;
 	unsigned long anon, file;
@@ -1994,7 +1992,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	 * well.
 	 */
 	if (current_is_kswapd()) {
-		if (!zone_reclaimable(zone))
+		if (!pgdat_reclaimable(pgdat))
 			force_scan = true;
 		if (!mem_cgroup_online(memcg))
 			force_scan = true;
@@ -2040,14 +2038,24 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	 * anon pages.  Try to detect this based on file LRU size.
 	 */
 	if (global_reclaim(sc)) {
-		unsigned long zonefile;
-		unsigned long zonefree;
+		unsigned long pgdatfile;
+		unsigned long pgdatfree;
+		int z;
+		unsigned long total_high_wmark = 0;
+
+		pgdatfree = sum_zone_node_page_state(pgdat->node_id, NR_FREE_PAGES);
+		pgdatfile = node_page_state(pgdat, NR_ACTIVE_FILE) +
+			   node_page_state(pgdat, NR_INACTIVE_FILE);
 
-		zonefree = zone_page_state(zone, NR_FREE_PAGES);
-		zonefile = zone_page_state(zone, NR_ACTIVE_FILE) +
-			   zone_page_state(zone, NR_INACTIVE_FILE);
+		for (z = 0; z < MAX_NR_ZONES; z++) {
+			struct zone *zone = &pgdat->node_zones[z];
+			if (!populated_zone(zone))
+				continue;
+
+			total_high_wmark += high_wmark_pages(zone);
+		}
 
-		if (unlikely(zonefile + zonefree <= high_wmark_pages(zone))) {
+		if (unlikely(pgdatfile + pgdatfree <= total_high_wmark)) {
 			scan_balance = SCAN_ANON;
 			goto out;
 		}
@@ -2094,7 +2102,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	file  = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE) +
 		lruvec_lru_size(lruvec, LRU_INACTIVE_FILE);
 
-	spin_lock_irq(zone_lru_lock(zone));
+	spin_lock_irq(&pgdat->lru_lock);
 	if (unlikely(reclaim_stat->recent_scanned[0] > anon / 4)) {
 		reclaim_stat->recent_scanned[0] /= 2;
 		reclaim_stat->recent_rotated[0] /= 2;
@@ -2115,7 +2123,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 
 	fp = file_prio * (reclaim_stat->recent_scanned[1] + 1);
 	fp /= reclaim_stat->recent_rotated[1] + 1;
-	spin_unlock_irq(zone_lru_lock(zone));
+	spin_unlock_irq(&pgdat->lru_lock);
 
 	fraction[0] = ap;
 	fraction[1] = fp;
@@ -2369,9 +2377,9 @@ static inline bool should_continue_reclaim(struct zone *zone,
 	 * inactive lists are large enough, continue reclaiming
 	 */
 	pages_for_compaction = (2UL << sc->order);
-	inactive_lru_pages = zone_page_state(zone, NR_INACTIVE_FILE);
+	inactive_lru_pages = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE);
 	if (get_nr_swap_pages() > 0)
-		inactive_lru_pages += zone_page_state(zone, NR_INACTIVE_ANON);
+		inactive_lru_pages += node_page_state(zone->zone_pgdat, NR_INACTIVE_ANON);
 	if (sc->nr_reclaimed < pages_for_compaction &&
 			inactive_lru_pages > pages_for_compaction)
 		return true;
@@ -2574,7 +2582,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 				continue;
 
 			if (sc->priority != DEF_PRIORITY &&
-			    !zone_reclaimable(zone))
+			    !pgdat_reclaimable(zone->zone_pgdat))
 				continue;	/* Let kswapd poll it */
 
 			/*
@@ -2615,7 +2623,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 			reclaimable = true;
 
 		if (global_reclaim(sc) &&
-		    !reclaimable && zone_reclaimable(zone))
+		    !reclaimable && pgdat_reclaimable(zone->zone_pgdat))
 			reclaimable = true;
 	}
 
@@ -2726,7 +2734,7 @@ static bool pfmemalloc_watermark_ok(pg_data_t *pgdat)
 	for (i = 0; i <= ZONE_NORMAL; i++) {
 		zone = &pgdat->node_zones[i];
 		if (!populated_zone(zone) ||
-		    zone_reclaimable_pages(zone) == 0)
+		    pgdat_reclaimable_pages(pgdat) == 0)
 			continue;
 
 		pfmemalloc_reserve += min_wmark_pages(zone);
@@ -3034,7 +3042,7 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
 		 * DEF_PRIORITY. Effectively, it considers them balanced so
 		 * they must be considered balanced here as well!
 		 */
-		if (!zone_reclaimable(zone)) {
+		if (!pgdat_reclaimable(zone->zone_pgdat)) {
 			balanced_pages += zone->managed_pages;
 			continue;
 		}
@@ -3097,6 +3105,7 @@ static bool kswapd_shrink_zone(struct zone *zone,
 {
 	unsigned long balance_gap;
 	bool lowmem_pressure;
+	struct pglist_data *pgdat = zone->zone_pgdat;
 
 	/* Reclaim above the high watermark. */
 	sc->nr_to_reclaim = max(SWAP_CLUSTER_MAX, high_wmark_pages(zone));
@@ -3121,7 +3130,8 @@ static bool kswapd_shrink_zone(struct zone *zone,
 
 	shrink_zone(zone, sc, zone_idx(zone) == classzone_idx);
 
-	clear_bit(ZONE_WRITEBACK, &zone->flags);
+	/* TODO: ANOMALY */
+	clear_bit(PGDAT_WRITEBACK, &pgdat->flags);
 
 	/*
 	 * If a zone reaches its high watermark, consider it to be no longer
@@ -3129,10 +3139,10 @@ static bool kswapd_shrink_zone(struct zone *zone,
 	 * BDIs but as pressure is relieved, speculatively avoid congestion
 	 * waits.
 	 */
-	if (zone_reclaimable(zone) &&
+	if (pgdat_reclaimable(zone->zone_pgdat) &&
 	    zone_balanced(zone, sc->order, false, 0, classzone_idx)) {
-		clear_bit(ZONE_CONGESTED, &zone->flags);
-		clear_bit(ZONE_DIRTY, &zone->flags);
+		clear_bit(PGDAT_CONGESTED, &pgdat->flags);
+		clear_bit(PGDAT_DIRTY, &pgdat->flags);
 	}
 
 	return sc->nr_scanned >= sc->nr_to_reclaim;
@@ -3191,7 +3201,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 				continue;
 
 			if (sc.priority != DEF_PRIORITY &&
-			    !zone_reclaimable(zone))
+			    !pgdat_reclaimable(zone->zone_pgdat))
 				continue;
 
 			/*
@@ -3218,9 +3228,11 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 				/*
 				 * If balanced, clear the dirty and congested
 				 * flags
+				 *
+				 * TODO: ANOMALY
 				 */
-				clear_bit(ZONE_CONGESTED, &zone->flags);
-				clear_bit(ZONE_DIRTY, &zone->flags);
+				clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags);
+				clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags);
 			}
 		}
 
@@ -3250,7 +3262,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 				continue;
 
 			if (sc.priority != DEF_PRIORITY &&
-			    !zone_reclaimable(zone))
+			    !pgdat_reclaimable(zone->zone_pgdat))
 				continue;
 
 			sc.nr_scanned = 0;
@@ -3646,8 +3658,8 @@ int sysctl_min_slab_ratio = 5;
 static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
 {
 	unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
-	unsigned long file_lru = zone_page_state(zone, NR_INACTIVE_FILE) +
-		zone_page_state(zone, NR_ACTIVE_FILE);
+	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
+		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
 
 	/*
 	 * It's possible for there to be more file mapped pages than
@@ -3750,7 +3762,7 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 	    zone_page_state(zone, NR_SLAB_RECLAIMABLE) <= zone->min_slab_pages)
 		return ZONE_RECLAIM_FULL;
 
-	if (!zone_reclaimable(zone))
+	if (!pgdat_reclaimable(zone->zone_pgdat))
 		return ZONE_RECLAIM_FULL;
 
 	/*
@@ -3829,7 +3841,7 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
 			zone = pagezone;
 			spin_lock_irq(zone_lru_lock(zone));
 		}
-		lruvec = mem_cgroup_page_lruvec(page, zone);
+		lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
 
 		if (!PageLRU(page) || !PageUnevictable(page))
 			continue;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 0fa8a2dc8170..5c1b0e1108d6 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -952,11 +952,6 @@ const char * const vmstat_text[] = {
 	/* enum zone_stat_item countes */
 	"nr_free_pages",
 	"nr_alloc_batch",
-	"nr_inactive_anon",
-	"nr_active_anon",
-	"nr_inactive_file",
-	"nr_active_file",
-	"nr_unevictable",
 	"nr_mlock",
 	"nr_anon_pages",
 	"nr_mapped",
@@ -972,12 +967,9 @@ const char * const vmstat_text[] = {
 	"nr_vmscan_write",
 	"nr_vmscan_immediate_reclaim",
 	"nr_writeback_temp",
-	"nr_isolated_anon",
-	"nr_isolated_file",
 	"nr_shmem",
 	"nr_dirtied",
 	"nr_written",
-	"nr_pages_scanned",
 
 #ifdef CONFIG_NUMA
 	"numa_hit",
@@ -993,6 +985,16 @@ const char * const vmstat_text[] = {
 	"nr_anon_transparent_hugepages",
 	"nr_free_cma",
 
+	/* Node-based counters */
+	"nr_inactive_anon",
+	"nr_active_anon",
+	"nr_inactive_file",
+	"nr_active_file",
+	"nr_unevictable",
+	"nr_isolated_anon",
+	"nr_isolated_file",
+	"nr_pages_scanned",
+
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
 	"nr_dirty_background_threshold",
@@ -1014,11 +1016,11 @@ const char * const vmstat_text[] = {
 	"pgmajfault",
 	"pglazyfreed",
 
-	TEXTS_FOR_ZONES("pgrefill")
-	TEXTS_FOR_ZONES("pgsteal_kswapd")
-	TEXTS_FOR_ZONES("pgsteal_direct")
-	TEXTS_FOR_ZONES("pgscan_kswapd")
-	TEXTS_FOR_ZONES("pgscan_direct")
+	"pgrefill",
+	"pgsteal_kswapd",
+	"pgsteal_direct",
+	"pgscan_kswapd",
+	"pgscan_direct",
 	"pgscan_direct_throttle",
 
 #ifdef CONFIG_NUMA
@@ -1435,7 +1437,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
 		   "\n        min      %lu"
 		   "\n        low      %lu"
 		   "\n        high     %lu"
-		   "\n        scanned  %lu"
+		   "\n   node_scanned  %lu"
 		   "\n        spanned  %lu"
 		   "\n        present  %lu"
 		   "\n        managed  %lu",
@@ -1443,13 +1445,13 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
 		   min_wmark_pages(zone),
 		   low_wmark_pages(zone),
 		   high_wmark_pages(zone),
-		   zone_page_state(zone, NR_PAGES_SCANNED),
+		   node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED),
 		   zone->spanned_pages,
 		   zone->present_pages,
 		   zone->managed_pages);
 
 	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
-		seq_printf(m, "\n    %-12s %lu", vmstat_text[i],
+		seq_printf(m, "\n      %-12s %lu", vmstat_text[i],
 				zone_page_state(zone, i));
 
 	seq_printf(m,
@@ -1479,12 +1481,12 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
 #endif
 	}
 	seq_printf(m,
-		   "\n  all_unreclaimable: %u"
-		   "\n  start_pfn:         %lu"
-		   "\n  inactive_ratio:    %u",
-		   !zone_reclaimable(zone),
+		   "\n  node_unreclaimable:  %u"
+		   "\n  start_pfn:           %lu"
+		   "\n  node_inactive_ratio: %u",
+		   !pgdat_reclaimable(zone->zone_pgdat),
 		   zone->zone_start_pfn,
-		   zone->inactive_ratio);
+		   zone->zone_pgdat->inactive_ratio);
 	seq_putc(m, '\n');
 }
 
@@ -1575,7 +1577,6 @@ static int vmstat_show(struct seq_file *m, void *arg)
 {
 	unsigned long *l = arg;
 	unsigned long off = l - (unsigned long *)m->private;
-
 	seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
 	return 0;
 }
diff --git a/mm/workingset.c b/mm/workingset.c
index ac36efa8c754..173399b239be 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -353,8 +353,9 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
 		pages = mem_cgroup_node_nr_lru_pages(sc->memcg, sc->nid,
 						     LRU_ALL_FILE);
 	} else {
-		pages = sum_zone_node_page_state(sc->nid, NR_ACTIVE_FILE) +
-			sum_zone_node_page_state(sc->nid, NR_INACTIVE_FILE);
+		pg_data_t *pgdat = NODE_DATA(sc->nid);
+		pages = node_page_state(pgdat, NR_ACTIVE_FILE) +
+			node_page_state(pgdat, NR_INACTIVE_FILE);
 	}
 
 	/*
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 05/27] mm, vmscan: Begin reclaiming pages on a per-node basis
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (3 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 04/27] mm, vmscan: Move LRU lists to node Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 06/27] mm, vmscan: Have kswapd only scan based on the highest requested zone Mel Gorman
                   ` (15 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

This patch makes reclaim decisions on a per-node basis. A reclaimer knows
what zone is required by the allocation request and skips pages from
higher zones. In many cases this will be ok because it's a GFP_HIGHMEM
request of some description. On 64-bit, ZONE_DMA32 requests will cause
some problems but 32-bit devices on 64-bit platforms are increasingly
rare. Historically it would have been a major problem on 32-bit with big
Highmem:Lowmem ratios but such configurations are also now rare and even
where they exist, they are not encouraged. If it really becomes a problem,
it'll manifest as very low reclaim efficiencies.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 77 ++++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 48 insertions(+), 29 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 75acb89c9df5..0f8dc3488f9d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -84,6 +84,9 @@ struct scan_control {
 	/* Scan (total_size >> priority) pages at once */
 	int priority;
 
+	/* The highest zone to isolate pages for reclaim from */
+	enum zone_type reclaim_idx;
+
 	unsigned int may_writepage:1;
 
 	/* Can mapped pages be reclaimed? */
@@ -1369,6 +1372,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 	struct list_head *src = &lruvec->lists[lru];
 	unsigned long nr_taken = 0;
 	unsigned long scan;
+	LIST_HEAD(pages_skipped);
 
 	for (scan = 0; scan < nr_to_scan && nr_taken < nr_to_scan &&
 					!list_empty(src); scan++) {
@@ -1380,6 +1384,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 
 		VM_BUG_ON_PAGE(!PageLRU(page), page);
 
+		if (page_zonenum(page) > sc->reclaim_idx) {
+			list_move(&page->lru, &pages_skipped);
+			continue;
+		}
+
 		switch (__isolate_lru_page(page, mode)) {
 		case 0:
 			nr_pages = hpage_nr_pages(page);
@@ -1398,6 +1407,15 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 		}
 	}
 
+	/*
+	 * Splice any skipped pages to the start of the LRU list. Note that
+	 * this disrupts the LRU order when reclaiming for lower zones but
+	 * we cannot splice to the tail. If we did then the SWAP_CLUSTER_MAX
+	 * scanning would soon rescan the same pages to skip and put the
+	 * system at risk of premature OOM.
+	 */
+	if (!list_empty(&pages_skipped))
+		list_splice(&pages_skipped, src);
 	*nr_scanned = scan;
 	trace_mm_vmscan_lru_isolate(sc->order, nr_to_scan, scan,
 				    nr_taken, mode, is_file_lru(lru));
@@ -1560,7 +1578,7 @@ static int current_may_throttle(void)
 }
 
 /*
- * shrink_inactive_list() is a helper for shrink_zone().  It returns the number
+ * shrink_inactive_list() is a helper for shrink_node().  It returns the number
  * of reclaimed pages
  */
 static noinline_for_stack unsigned long
@@ -2394,12 +2412,13 @@ static inline bool should_continue_reclaim(struct zone *zone,
 	}
 }
 
-static bool shrink_zone(struct zone *zone, struct scan_control *sc,
-			bool is_classzone)
+static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
+			enum zone_type classzone_idx)
 {
 	struct reclaim_state *reclaim_state = current->reclaim_state;
 	unsigned long nr_reclaimed, nr_scanned;
 	bool reclaimable = false;
+	struct zone *zone = &pgdat->node_zones[classzone_idx];
 
 	do {
 		struct mem_cgroup *root = sc->target_mem_cgroup;
@@ -2431,7 +2450,7 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc,
 			shrink_zone_memcg(zone, memcg, sc, &lru_pages);
 			zone_lru_pages += lru_pages;
 
-			if (memcg && is_classzone)
+			if (!global_reclaim(sc) && sc->reclaim_idx == classzone_idx)
 				shrink_slab(sc->gfp_mask, zone_to_nid(zone),
 					    memcg, sc->nr_scanned - scanned,
 					    lru_pages);
@@ -2462,7 +2481,7 @@ static bool shrink_zone(struct zone *zone, struct scan_control *sc,
 		 * Shrink the slab caches in the same proportion that
 		 * the eligible LRU pages were scanned.
 		 */
-		if (global_reclaim(sc) && is_classzone)
+		if (global_reclaim(sc) && sc->reclaim_idx == classzone_idx)
 			shrink_slab(sc->gfp_mask, zone_to_nid(zone), NULL,
 				    sc->nr_scanned - nr_scanned,
 				    zone_lru_pages);
@@ -2541,14 +2560,14 @@ static inline bool compaction_ready(struct zone *zone, int order)
  *
  * Returns true if a zone was reclaimable.
  */
-static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
+static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
+		enum zone_type classzone_idx)
 {
 	struct zoneref *z;
 	struct zone *zone;
 	unsigned long nr_soft_reclaimed;
 	unsigned long nr_soft_scanned;
 	gfp_t orig_mask;
-	enum zone_type requested_highidx = gfp_zone(sc->gfp_mask);
 	bool reclaimable = false;
 
 	/*
@@ -2561,16 +2580,12 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 		sc->gfp_mask |= __GFP_HIGHMEM;
 
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
-					requested_highidx, sc->nodemask) {
-		enum zone_type classzone_idx;
-
-		if (!populated_zone(zone))
-			continue;
-
-		classzone_idx = requested_highidx;
-		while (!populated_zone(zone->zone_pgdat->node_zones +
-							classzone_idx))
+					classzone_idx, sc->nodemask) {
+		if (!populated_zone(zone)) {
+			sc->reclaim_idx--;
 			classzone_idx--;
+			continue;
+		}
 
 		/*
 		 * Take care memory controller reclaiming has small influence
@@ -2596,7 +2611,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 			 */
 			if (IS_ENABLED(CONFIG_COMPACTION) &&
 			    sc->order > PAGE_ALLOC_COSTLY_ORDER &&
-			    zonelist_zone_idx(z) <= requested_highidx &&
+			    zonelist_zone_idx(z) <= classzone_idx &&
 			    compaction_ready(zone, sc->order)) {
 				sc->compaction_ready = true;
 				continue;
@@ -2619,7 +2634,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 			/* need some check for avoid more shrink_zone() */
 		}
 
-		if (shrink_zone(zone, sc, zone_idx(zone) == classzone_idx))
+		if (shrink_node(zone->zone_pgdat, sc, classzone_idx))
 			reclaimable = true;
 
 		if (global_reclaim(sc) &&
@@ -2659,6 +2674,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 	unsigned long total_scanned = 0;
 	unsigned long writeback_threshold;
 	bool zones_reclaimable;
+	enum zone_type classzone_idx = gfp_zone(sc->gfp_mask);
 retry:
 	delayacct_freepages_start();
 
@@ -2669,7 +2685,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 		vmpressure_prio(sc->gfp_mask, sc->target_mem_cgroup,
 				sc->priority);
 		sc->nr_scanned = 0;
-		zones_reclaimable = shrink_zones(zonelist, sc);
+		sc->reclaim_idx = classzone_idx;
+		zones_reclaimable = shrink_zones(zonelist, sc, classzone_idx);
 
 		total_scanned += sc->nr_scanned;
 		if (sc->nr_reclaimed >= sc->nr_to_reclaim)
@@ -3128,7 +3145,7 @@ static bool kswapd_shrink_zone(struct zone *zone,
 						balance_gap, classzone_idx))
 		return true;
 
-	shrink_zone(zone, sc, zone_idx(zone) == classzone_idx);
+	shrink_node(zone->zone_pgdat, sc, classzone_idx);
 
 	/* TODO: ANOMALY */
 	clear_bit(PGDAT_WRITEBACK, &pgdat->flags);
@@ -3177,6 +3194,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 	unsigned long nr_soft_scanned;
 	struct scan_control sc = {
 		.gfp_mask = GFP_KERNEL,
+		.reclaim_idx = MAX_NR_ZONES - 1,
 		.order = order,
 		.priority = DEF_PRIORITY,
 		.may_writepage = !laptop_mode,
@@ -3247,15 +3265,14 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 			sc.may_writepage = 1;
 
 		/*
-		 * Now scan the zone in the dma->highmem direction, stopping
-		 * at the last zone which needs scanning.
-		 *
-		 * We do this because the page allocator works in the opposite
-		 * direction.  This prevents the page allocator from allocating
-		 * pages behind kswapd's direction of progress, which would
-		 * cause too much scanning of the lower zones.
+		 * Continue scanning in the highmem->dma direction stopping at
+		 * the last zone which needs scanning. This may reclaim lowmem
+		 * pages that are not necessary for zone balancing but it
+		 * preserves LRU ordering. It is assumed that the bulk of
+		 * allocation requests can use arbitrary zones with the
+		 * possible exception of big highmem:lowmem configurations.
 		 */
-		for (i = 0; i <= end_zone; i++) {
+		for (i = end_zone; i >= end_zone; i--) {
 			struct zone *zone = pgdat->node_zones + i;
 
 			if (!populated_zone(zone))
@@ -3266,6 +3283,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 				continue;
 
 			sc.nr_scanned = 0;
+			sc.reclaim_idx = i;
 
 			nr_soft_scanned = 0;
 			/*
@@ -3714,6 +3732,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 		.may_writepage = !!(zone_reclaim_mode & RECLAIM_WRITE),
 		.may_unmap = !!(zone_reclaim_mode & RECLAIM_UNMAP),
 		.may_swap = 1,
+		.reclaim_idx = zone_idx(zone),
 	};
 
 	cond_resched();
@@ -3733,7 +3752,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 		 * priorities until we have enough memory freed.
 		 */
 		do {
-			shrink_zone(zone, &sc, true);
+			shrink_node(zone->zone_pgdat, &sc, zone_idx(zone));
 		} while (sc.nr_reclaimed < nr_pages && --sc.priority >= 0);
 	}
 
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 06/27] mm, vmscan: Have kswapd only scan based on the highest requested zone
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (4 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 05/27] mm, vmscan: Begin reclaiming pages on a per-node basis Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 07/27] mm, vmscan: Make kswapd reclaim in terms of nodes Mel Gorman
                   ` (14 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

kswapd checks all eligible zones to see if they need balancing even if it was
woken for a lower zone. This made sense when we reclaimed on a per-zone basis
because we wanted to shrink zones fairly so avoid age-inversion problems.
Ideally this is completely unnecessary when reclaiming on a per-node basis.
In theory, there may still be anomalies when all requests are for lower
zones and very old pages are preserved in higher zones but this should be
the exceptional case.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0f8dc3488f9d..f2534e8f8527 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3208,11 +3208,8 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 
 		sc.nr_reclaimed = 0;
 
-		/*
-		 * Scan in the highmem->dma direction for the highest
-		 * zone which needs scanning
-		 */
-		for (i = pgdat->nr_zones - 1; i >= 0; i--) {
+		/* Scan from the highest requested zone to dma */
+		for (i = classzone_idx; i >= 0; i--) {
 			struct zone *zone = pgdat->node_zones + i;
 
 			if (!populated_zone(zone))
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 07/27] mm, vmscan: Make kswapd reclaim in terms of nodes
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (5 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 06/27] mm, vmscan: Have kswapd only scan based on the highest requested zone Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 08/27] mm, vmscan: Simplify the logic deciding whether kswapd sleeps Mel Gorman
                   ` (13 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Patch "mm: vmscan: Begin reclaiming pages on a per-node basis" started
thinking of reclaim in terms of nodes but kswapd is still zone-centric. This
patch gets rid of many of the node-based versus zone-based decisions.

o A node is considered balanced when any eligible lower zone is balanced.
  This eliminates one class of age-inversion problem because we avoid
  reclaiming a newer page just because it's in the wrong zone
o pgdat_balanced disappears because we now only care about one zone being
  balanced.
o Some anomalies related to writeback and congestion tracking being based on
  zones disappear.
o kswapd no longer has to take care to reclaim zones in the reverse order
  that the page allocator uses.
o Most importantly of all, reclaim from node 0 with multiple zones will
  have similar aging and reclaiming characteristics as every
  other node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/vmscan.c | 292 +++++++++++++++++++++---------------------------------------
 1 file changed, 101 insertions(+), 191 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f2534e8f8527..c23d8f9722ad 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2979,7 +2979,8 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
 }
 #endif
 
-static void age_active_anon(struct zone *zone, struct scan_control *sc)
+static void age_active_anon(struct pglist_data *pgdat,
+				struct zone *zone, struct scan_control *sc)
 {
 	struct mem_cgroup *memcg;
 
@@ -2998,85 +2999,15 @@ static void age_active_anon(struct zone *zone, struct scan_control *sc)
 	} while (memcg);
 }
 
-static bool zone_balanced(struct zone *zone, int order, bool highorder,
+static bool zone_balanced(struct zone *zone, int order,
 			unsigned long balance_gap, int classzone_idx)
 {
 	unsigned long mark = high_wmark_pages(zone) + balance_gap;
 
-	/*
-	 * When checking from pgdat_balanced(), kswapd should stop and sleep
-	 * when it reaches the high order-0 watermark and let kcompactd take
-	 * over. Other callers such as wakeup_kswapd() want to determine the
-	 * true high-order watermark.
-	 */
-	if (IS_ENABLED(CONFIG_COMPACTION) && !highorder) {
-		mark += (1UL << order);
-		order = 0;
-	}
-
 	return zone_watermark_ok_safe(zone, order, mark, classzone_idx);
 }
 
 /*
- * pgdat_balanced() is used when checking if a node is balanced.
- *
- * For order-0, all zones must be balanced!
- *
- * For high-order allocations only zones that meet watermarks and are in a
- * zone allowed by the callers classzone_idx are added to balanced_pages. The
- * total of balanced pages must be at least 25% of the zones allowed by
- * classzone_idx for the node to be considered balanced. Forcing all zones to
- * be balanced for high orders can cause excessive reclaim when there are
- * imbalanced zones.
- * The choice of 25% is due to
- *   o a 16M DMA zone that is balanced will not balance a zone on any
- *     reasonable sized machine
- *   o On all other machines, the top zone must be at least a reasonable
- *     percentage of the middle zones. For example, on 32-bit x86, highmem
- *     would need to be at least 256M for it to be balance a whole node.
- *     Similarly, on x86-64 the Normal zone would need to be at least 1G
- *     to balance a node on its own. These seemed like reasonable ratios.
- */
-static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
-{
-	unsigned long managed_pages = 0;
-	unsigned long balanced_pages = 0;
-	int i;
-
-	/* Check the watermark levels */
-	for (i = 0; i <= classzone_idx; i++) {
-		struct zone *zone = pgdat->node_zones + i;
-
-		if (!populated_zone(zone))
-			continue;
-
-		managed_pages += zone->managed_pages;
-
-		/*
-		 * A special case here:
-		 *
-		 * balance_pgdat() skips over all_unreclaimable after
-		 * DEF_PRIORITY. Effectively, it considers them balanced so
-		 * they must be considered balanced here as well!
-		 */
-		if (!pgdat_reclaimable(zone->zone_pgdat)) {
-			balanced_pages += zone->managed_pages;
-			continue;
-		}
-
-		if (zone_balanced(zone, order, false, 0, i))
-			balanced_pages += zone->managed_pages;
-		else if (!order)
-			return false;
-	}
-
-	if (order)
-		return balanced_pages >= (managed_pages >> 2);
-	else
-		return true;
-}
-
-/*
  * Prepare kswapd for sleeping. This verifies that there are no processes
  * waiting in throttle_direct_reclaim() and that watermarks have been met.
  *
@@ -3085,6 +3016,8 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
 static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, long remaining,
 					int classzone_idx)
 {
+	int i;
+
 	/* If a direct reclaimer woke kswapd within HZ/10, it's premature */
 	if (remaining)
 		return false;
@@ -3105,101 +3038,90 @@ static bool prepare_kswapd_sleep(pg_data_t *pgdat, int order, long remaining,
 	if (waitqueue_active(&pgdat->pfmemalloc_wait))
 		wake_up_all(&pgdat->pfmemalloc_wait);
 
-	return pgdat_balanced(pgdat, order, classzone_idx);
+	for (i = 0; i <= classzone_idx; i++) {
+		struct zone *zone = pgdat->node_zones + i;
+
+		if (!populated_zone(zone))
+			continue;
+
+		if (zone_balanced(zone, order, 0, classzone_idx))
+			return true;
+	}
+
+	return false;
 }
 
 /*
- * kswapd shrinks the zone by the number of pages required to reach
- * the high watermark.
+ * kswapd shrinks a node of pages that are at or below the highest usable
+ * zone that is currently unbalanced.
  *
  * Returns true if kswapd scanned at least the requested number of pages to
  * reclaim or if the lack of progress was due to pages under writeback.
  * This is used to determine if the scanning priority needs to be raised.
  */
-static bool kswapd_shrink_zone(struct zone *zone,
+static bool kswapd_shrink_node(pg_data_t *pgdat,
 			       int classzone_idx,
 			       struct scan_control *sc)
 {
-	unsigned long balance_gap;
-	bool lowmem_pressure;
-	struct pglist_data *pgdat = zone->zone_pgdat;
+	struct zone *zone;
+	unsigned long nr_to_reclaim = 0;
+	int z;
 
-	/* Reclaim above the high watermark. */
-	sc->nr_to_reclaim = max(SWAP_CLUSTER_MAX, high_wmark_pages(zone));
+	/* Reclaim a number of pages proportional to the number of zones */
+	for (z = 0; z <= classzone_idx; z++) {
+		zone = pgdat->node_zones + z;
+		if (!populated_zone(zone))
+			continue;
 
-	/*
-	 * We put equal pressure on every zone, unless one zone has way too
-	 * many pages free already. The "too many pages" is defined as the
-	 * high wmark plus a "gap" where the gap is either the low
-	 * watermark or 1% of the zone, whichever is smaller.
-	 */
-	balance_gap = min(low_wmark_pages(zone), DIV_ROUND_UP(
-			zone->managed_pages, KSWAPD_ZONE_BALANCE_GAP_RATIO));
+		nr_to_reclaim += max(high_wmark_pages(zone), SWAP_CLUSTER_MAX);
+	}
 
 	/*
-	 * If there is no low memory pressure or the zone is balanced then no
-	 * reclaim is necessary
+	 * Historically care was taken to put equal pressure on all zones but
+	 * now pressure is applied based on node LRU order.
 	 */
-	lowmem_pressure = (buffer_heads_over_limit && is_highmem(zone));
-	if (!lowmem_pressure && zone_balanced(zone, sc->order, false,
-						balance_gap, classzone_idx))
-		return true;
-
-	shrink_node(zone->zone_pgdat, sc, classzone_idx);
-
-	/* TODO: ANOMALY */
-	clear_bit(PGDAT_WRITEBACK, &pgdat->flags);
+	shrink_node(pgdat, sc, classzone_idx);
 
 	/*
-	 * If a zone reaches its high watermark, consider it to be no longer
-	 * congested. It's possible there are dirty pages backed by congested
-	 * BDIs but as pressure is relieved, speculatively avoid congestion
-	 * waits.
+	 * Fragmentation may mean that the system cannot be rebalanced for
+	 * high-order allocations. If twice the allocation size has been
+	 * reclaimed then recheck watermarks only at order-0 to prevent
+	 * excessive reclaim. Assume that a process requested a high-order
+	 * can direct reclaim/compact.
 	 */
-	if (pgdat_reclaimable(zone->zone_pgdat) &&
-	    zone_balanced(zone, sc->order, false, 0, classzone_idx)) {
-		clear_bit(PGDAT_CONGESTED, &pgdat->flags);
-		clear_bit(PGDAT_DIRTY, &pgdat->flags);
-	}
+	if (sc->order && sc->nr_reclaimed >= 2UL << sc->order)
+		sc->order = 0;
 
 	return sc->nr_scanned >= sc->nr_to_reclaim;
 }
 
 /*
- * For kswapd, balance_pgdat() will work across all this node's zones until
- * they are all at high_wmark_pages(zone).
- *
- * Returns the highest zone idx kswapd was reclaiming at
+ * For kswapd, balance_pgdat() will reclaim pages across a node from zones
+ * that are eligible for use by the caller until at least one zone is
+ * balanced.
  *
- * There is special handling here for zones which are full of pinned pages.
- * This can happen if the pages are all mlocked, or if they are all used by
- * device drivers (say, ZONE_DMA).  Or if they are all in use by hugetlb.
- * What we do is to detect the case where all pages in the zone have been
- * scanned twice and there has been zero successful reclaim.  Mark the zone as
- * dead and from now on, only perform a short scan.  Basically we're polling
- * the zone for when the problem goes away.
+ * Returns the order kswapd finished reclaiming at.
  *
  * kswapd scans the zones in the highmem->normal->dma direction.  It skips
  * zones which have free_pages > high_wmark_pages(zone), but once a zone is
- * found to have free_pages <= high_wmark_pages(zone), we scan that zone and the
- * lower zones regardless of the number of free pages in the lower zones. This
- * interoperates with the page allocator fallback scheme to ensure that aging
- * of pages is balanced across the zones.
+ * found to have free_pages <= high_wmark_pages(zone), any page is that zone
+ * or lower is eligible for reclaim until at least one usable zone is
+ * balanced.
  */
 static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 {
 	int i;
-	int end_zone = 0;	/* Inclusive.  0 = ZONE_DMA */
 	unsigned long nr_soft_reclaimed;
 	unsigned long nr_soft_scanned;
+	struct zone *zone;
 	struct scan_control sc = {
 		.gfp_mask = GFP_KERNEL,
-		.reclaim_idx = MAX_NR_ZONES - 1,
 		.order = order,
 		.priority = DEF_PRIORITY,
 		.may_writepage = !laptop_mode,
 		.may_unmap = 1,
 		.may_swap = 1,
+		.reclaim_idx = classzone_idx,
 	};
 	count_vm_event(PAGEOUTRUN);
 
@@ -3210,21 +3132,10 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 
 		/* Scan from the highest requested zone to dma */
 		for (i = classzone_idx; i >= 0; i--) {
-			struct zone *zone = pgdat->node_zones + i;
-
+			zone = pgdat->node_zones + i;
 			if (!populated_zone(zone))
 				continue;
 
-			if (sc.priority != DEF_PRIORITY &&
-			    !pgdat_reclaimable(zone->zone_pgdat))
-				continue;
-
-			/*
-			 * Do some background aging of the anon list, to give
-			 * pages a chance to be referenced before reclaiming.
-			 */
-			age_active_anon(zone, &sc);
-
 			/*
 			 * If the number of buffer_heads in the machine
 			 * exceeds the maximum allowed level and this node
@@ -3232,19 +3143,17 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 			 * it to relieve lowmem pressure.
 			 */
 			if (buffer_heads_over_limit && is_highmem_idx(i)) {
-				end_zone = i;
+				classzone_idx = i;
 				break;
 			}
 
-			if (!zone_balanced(zone, order, false, 0, 0)) {
-				end_zone = i;
+			if (!zone_balanced(zone, order, 0, 0)) {
+				classzone_idx = i;
 				break;
 			} else {
 				/*
-				 * If balanced, clear the dirty and congested
-				 * flags
-				 *
-				 * TODO: ANOMALY
+				 * If any eligible zone is balanced then the
+				 * node is not considered congested or dirty.
 				 */
 				clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags);
 				clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags);
@@ -3255,51 +3164,34 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 			goto out;
 
 		/*
+		 * Do some background aging of the anon list, to give
+		 * pages a chance to be referenced before reclaiming. All
+		 * pages are rotated regardless of classzone as this is
+		 * about consistent aging.
+		 */
+		age_active_anon(pgdat, &pgdat->node_zones[MAX_NR_ZONES - 1], &sc);
+
+		/*
 		 * If we're getting trouble reclaiming, start doing writepage
 		 * even in laptop mode.
 		 */
-		if (sc.priority < DEF_PRIORITY - 2)
+		if (sc.priority < DEF_PRIORITY - 2 || !pgdat_reclaimable(pgdat))
 			sc.may_writepage = 1;
 
+		/* Call soft limit reclaim before calling shrink_node. */
+		sc.nr_scanned = 0;
+		nr_soft_scanned = 0;
+		nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone, sc.order,
+						sc.gfp_mask, &nr_soft_scanned);
+		sc.nr_reclaimed += nr_soft_reclaimed;
+
 		/*
-		 * Continue scanning in the highmem->dma direction stopping at
-		 * the last zone which needs scanning. This may reclaim lowmem
-		 * pages that are not necessary for zone balancing but it
-		 * preserves LRU ordering. It is assumed that the bulk of
-		 * allocation requests can use arbitrary zones with the
-		 * possible exception of big highmem:lowmem configurations.
+		 * There should be no need to raise the scanning priority if
+		 * enough pages are already being scanned that that high
+		 * watermark would be met at 100% efficiency.
 		 */
-		for (i = end_zone; i >= end_zone; i--) {
-			struct zone *zone = pgdat->node_zones + i;
-
-			if (!populated_zone(zone))
-				continue;
-
-			if (sc.priority != DEF_PRIORITY &&
-			    !pgdat_reclaimable(zone->zone_pgdat))
-				continue;
-
-			sc.nr_scanned = 0;
-			sc.reclaim_idx = i;
-
-			nr_soft_scanned = 0;
-			/*
-			 * Call soft limit reclaim before calling shrink_zone.
-			 */
-			nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone,
-							order, sc.gfp_mask,
-							&nr_soft_scanned);
-			sc.nr_reclaimed += nr_soft_reclaimed;
-
-			/*
-			 * There should be no need to raise the scanning
-			 * priority if enough pages are already being scanned
-			 * that that high watermark would be met at 100%
-			 * efficiency.
-			 */
-			if (kswapd_shrink_zone(zone, end_zone, &sc))
-				raise_priority = false;
-		}
+		if (kswapd_shrink_node(pgdat, classzone_idx, &sc))
+			raise_priority = false;
 
 		/*
 		 * If the low watermark is met there is no need for processes
@@ -3315,20 +3207,37 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 			break;
 
 		/*
+		 * Stop reclaiming if any eligible zone is balanced and clear
+		 * node writeback or congested.
+		 */
+		for (i = 0; i <= classzone_idx; i++) {
+			zone = pgdat->node_zones + i;
+			if (!populated_zone(zone))
+				continue;
+
+			if (zone_balanced(zone, sc.order, 0, classzone_idx)) {
+				clear_bit(PGDAT_CONGESTED, &pgdat->flags);
+				clear_bit(PGDAT_DIRTY, &pgdat->flags);
+				goto out;
+			}
+		}
+
+		/*
 		 * Raise priority if scanning rate is too low or there was no
 		 * progress in reclaiming pages
 		 */
 		if (raise_priority || !sc.nr_reclaimed)
 			sc.priority--;
-	} while (sc.priority >= 1 &&
-			!pgdat_balanced(pgdat, order, classzone_idx));
+	} while (sc.priority >= 1);
 
 out:
 	/*
-	 * Return the highest zone idx we were reclaiming at so
-	 * prepare_kswapd_sleep() makes the same decisions as here.
+	 * Return the order kswapd stopped reclaiming at as
+	 * prepare_kswapd_sleep() takes it into account. If another caller
+	 * entered the allocator slow path while kswapd was awake, order will
+	 * remain at the higher level.
 	 */
-	return end_zone;
+	return sc.order;
 }
 
 static void kswapd_try_to_sleep(pg_data_t *pgdat, int order,
@@ -3485,8 +3394,9 @@ static int kswapd(void *p)
 		 */
 		if (!ret) {
 			trace_mm_vmscan_kswapd_wake(pgdat->node_id, order);
-			balanced_classzone_idx = balance_pgdat(pgdat, order,
-								classzone_idx);
+
+			/* return value ignored until next patch */
+			balance_pgdat(pgdat, order, classzone_idx);
 		}
 	}
 
@@ -3516,7 +3426,7 @@ void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
 	}
 	if (!waitqueue_active(&pgdat->kswapd_wait))
 		return;
-	if (zone_balanced(zone, order, true, 0, 0))
+	if (zone_balanced(zone, order, 0, 0))
 		return;
 
 	trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, zone_idx(zone), order);
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 08/27] mm, vmscan: Simplify the logic deciding whether kswapd sleeps
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (6 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 07/27] mm, vmscan: Make kswapd reclaim in terms of nodes Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 09/27] mm, vmscan: By default have direct reclaim only shrink once per node Mel Gorman
                   ` (12 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

kswapd goes through some complex steps trying to figure out if it
should stay awake based on the classzone_idx and the requested order.
It is unnecessarily complex and passes in an invalid classzone_idx to
balance_pgdat().  What matters most of all is whether a larger order has
been requsted and whether kswapd successfully reclaimed at the previous
order. This patch irons out the logic to check just that and the end result
is less headache inducing.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 include/linux/mmzone.h |  5 ++--
 mm/memory_hotplug.c    |  5 ++--
 mm/page_alloc.c        |  2 +-
 mm/vmscan.c            | 79 +++++++++++++++++++++++++-------------------------
 4 files changed, 46 insertions(+), 45 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a9b7d3b201e1..d620cd44ae1b 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -667,8 +667,9 @@ typedef struct pglist_data {
 	wait_queue_head_t pfmemalloc_wait;
 	struct task_struct *kswapd;	/* Protected by
 					   mem_hotplug_begin/end() */
-	int kswapd_max_order;
-	enum zone_type classzone_idx;
+	int kswapd_order;
+	enum zone_type kswapd_classzone_idx;
+
 #ifdef CONFIG_COMPACTION
 	int kcompactd_max_order;
 	enum zone_type kcompactd_classzone_idx;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 372f1099fc8f..f66a54608529 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1148,9 +1148,10 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
 
 		arch_refresh_nodedata(nid, pgdat);
 	} else {
-		/* Reset the nr_zones and classzone_idx to 0 before reuse */
+		/* Reset the nr_zones, order and classzone_idx before reuse */
 		pgdat->nr_zones = 0;
-		pgdat->classzone_idx = 0;
+		pgdat->kswapd_order = 0;
+		pgdat->kswapd_classzone_idx = -1;
 	}
 
 	/* we can use NODE_DATA(nid) from here */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 50170f4b6b42..71a112721935 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5605,7 +5605,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 	unsigned long end_pfn = 0;
 
 	/* pg_data_t should be reset to zero when it's allocated */
-	WARN_ON(pgdat->nr_zones || pgdat->classzone_idx);
+	WARN_ON(pgdat->nr_zones || pgdat->kswapd_classzone_idx);
 
 	reset_deferred_meminit(pgdat);
 	pgdat->node_id = nid;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c23d8f9722ad..132d9a04de6b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2766,7 +2766,7 @@ static bool pfmemalloc_watermark_ok(pg_data_t *pgdat)
 
 	/* kswapd must be awake if processes are being throttled */
 	if (!wmark_ok && waitqueue_active(&pgdat->kswapd_wait)) {
-		pgdat->classzone_idx = min(pgdat->classzone_idx,
+		pgdat->kswapd_classzone_idx = min(pgdat->kswapd_classzone_idx,
 						(enum zone_type)ZONE_NORMAL);
 		wake_up_interruptible(&pgdat->kswapd_wait);
 	}
@@ -3251,6 +3251,12 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int order,
 
 	prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE);
 
+	/* If kswapd has not been woken recently, then full sleep */
+	if (classzone_idx == -1) {
+		classzone_idx = balanced_classzone_idx = MAX_NR_ZONES - 1;
+		goto full_sleep;
+	}
+
 	/* Try to sleep for a short interval */
 	if (prepare_kswapd_sleep(pgdat, order, remaining,
 						balanced_classzone_idx)) {
@@ -3259,6 +3265,7 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int order,
 		prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE);
 	}
 
+full_sleep:
 	/*
 	 * After a short sleep, check if it was a premature sleep. If not, then
 	 * go fully to sleep until explicitly woken up.
@@ -3319,9 +3326,7 @@ static void kswapd_try_to_sleep(pg_data_t *pgdat, int order,
  */
 static int kswapd(void *p)
 {
-	unsigned long order, new_order;
-	int classzone_idx, new_classzone_idx;
-	int balanced_classzone_idx;
+	unsigned int order, classzone_idx;
 	pg_data_t *pgdat = (pg_data_t*)p;
 	struct task_struct *tsk = current;
 
@@ -3351,38 +3356,25 @@ static int kswapd(void *p)
 	tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
 	set_freezable();
 
-	order = new_order = 0;
-	classzone_idx = new_classzone_idx = pgdat->nr_zones - 1;
-	balanced_classzone_idx = classzone_idx;
+	pgdat->kswapd_order = order = 0;
+	pgdat->kswapd_classzone_idx = classzone_idx = -1;
 	for ( ; ; ) {
 		bool ret;
 
+kswapd_try_sleep:
+		kswapd_try_to_sleep(pgdat, order, classzone_idx, classzone_idx);
+
 		/*
-		 * While we were reclaiming, there might have been another
-		 * wakeup, so check the values.
+		 * Read the new order and classzone_idx which may be -1 if
+		 * kswapd_try_to_sleep() woke up after a short timeout instead
+		 * of being woken by the page allocator.
 		 */
-		new_order = pgdat->kswapd_max_order;
-		new_classzone_idx = pgdat->classzone_idx;
-		pgdat->kswapd_max_order =  0;
-		pgdat->classzone_idx = pgdat->nr_zones - 1;
-
-		if (order < new_order || classzone_idx > new_classzone_idx) {
-			/*
-			 * Don't sleep if someone wants a larger 'order'
-			 * allocation or has tigher zone constraints
-			 */
-			order = new_order;
-			classzone_idx = new_classzone_idx;
-		} else {
-			kswapd_try_to_sleep(pgdat, order, classzone_idx,
-						balanced_classzone_idx);
-			order = pgdat->kswapd_max_order;
-			classzone_idx = pgdat->classzone_idx;
-			new_order = order;
-			new_classzone_idx = classzone_idx;
-			pgdat->kswapd_max_order = 0;
-			pgdat->classzone_idx = pgdat->nr_zones - 1;
-		}
+		order = pgdat->kswapd_order;
+		classzone_idx = pgdat->kswapd_classzone_idx;
+		if (classzone_idx == -1)
+			classzone_idx = MAX_NR_ZONES - 1;
+		pgdat->kswapd_order = 0;
+		pgdat->kswapd_classzone_idx = -1;
 
 		ret = try_to_freeze();
 		if (kthread_should_stop())
@@ -3392,12 +3384,19 @@ static int kswapd(void *p)
 		 * We can speed up thawing tasks if we don't call balance_pgdat
 		 * after returning from the refrigerator
 		 */
-		if (!ret) {
-			trace_mm_vmscan_kswapd_wake(pgdat->node_id, order);
+		if (ret)
+			continue;
 
-			/* return value ignored until next patch */
-			balance_pgdat(pgdat, order, classzone_idx);
-		}
+		/*
+		 * Try reclaim the requested order but if that fails
+		 * then try sleeping on the basis of the order reclaimed.
+		 */
+		trace_mm_vmscan_kswapd_wake(pgdat->node_id, order);
+		if (balance_pgdat(pgdat, order, classzone_idx) < order)
+			goto kswapd_try_sleep;
+
+		order = pgdat->kswapd_order;
+		classzone_idx = pgdat->kswapd_classzone_idx;
 	}
 
 	tsk->flags &= ~(PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD);
@@ -3420,10 +3419,10 @@ void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
 	if (!cpuset_zone_allowed(zone, GFP_KERNEL | __GFP_HARDWALL))
 		return;
 	pgdat = zone->zone_pgdat;
-	if (pgdat->kswapd_max_order < order) {
-		pgdat->kswapd_max_order = order;
-		pgdat->classzone_idx = min(pgdat->classzone_idx, classzone_idx);
-	}
+	if (pgdat->kswapd_classzone_idx == -1)
+		pgdat->kswapd_classzone_idx = classzone_idx;
+	pgdat->kswapd_classzone_idx = max(pgdat->kswapd_classzone_idx, classzone_idx);
+	pgdat->kswapd_order = max(pgdat->kswapd_order, order);
 	if (!waitqueue_active(&pgdat->kswapd_wait))
 		return;
 	if (zone_balanced(zone, order, 0, 0))
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 09/27] mm, vmscan: By default have direct reclaim only shrink once per node
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (7 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 08/27] mm, vmscan: Simplify the logic deciding whether kswapd sleeps Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 10/27] mm, vmscan: Clear congestion, dirty and need for compaction on a per-node basis Mel Gorman
                   ` (11 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Direct reclaim iterates over all zones in the zonelist and shrinking them
but this is in conflict with node-based reclaim. In the default case,
only shrink once per node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/vmscan.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 132d9a04de6b..a631972d49e1 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2547,14 +2547,6 @@ static inline bool compaction_ready(struct zone *zone, int order)
  * try to reclaim pages from zones which will satisfy the caller's allocation
  * request.
  *
- * We reclaim from a zone even if that zone is over high_wmark_pages(zone).
- * Because:
- * a) The caller may be trying to free *extra* pages to satisfy a higher-order
- *    allocation or
- * b) The target zone may be at high_wmark_pages(zone) but the lower zones
- *    must go *over* high_wmark_pages(zone) to satisfy the `incremental min'
- *    zone defense algorithm.
- *
  * If a zone is deemed to be full of pinned pages then just give it a light
  * scan then give up on it.
  *
@@ -2569,6 +2561,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
 	unsigned long nr_soft_scanned;
 	gfp_t orig_mask;
 	bool reclaimable = false;
+	pg_data_t *last_pgdat = NULL;
 
 	/*
 	 * If the number of buffer_heads in the machine exceeds the maximum
@@ -2581,11 +2574,17 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
 
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
 					classzone_idx, sc->nodemask) {
-		if (!populated_zone(zone)) {
-			sc->reclaim_idx--;
-			classzone_idx--;
+		BUG_ON(!populated_zone(zone));
+
+		/*
+		 * Shrink each node in the zonelist once. If the zonelist is
+		 * ordered by zone (not the default) then a node may be
+		 * shrunk multiple times but in that case the user prefers
+		 * lower zones being preserved
+		 */
+		if (zone->zone_pgdat == last_pgdat)
 			continue;
-		}
+		last_pgdat = zone->zone_pgdat;
 
 		/*
 		 * Take care memory controller reclaiming has small influence
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 10/27] mm, vmscan: Clear congestion, dirty and need for compaction on a per-node basis
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (8 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 09/27] mm, vmscan: By default have direct reclaim only shrink once per node Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman
                   ` (10 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Congested and dirty tracking of a node and whether reclaim should stall
is still based on zone activity. This patch considers whether the kernel
should stall based on node-based reclaim activity.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a631972d49e1..c62505f9e8be 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3003,7 +3003,17 @@ static bool zone_balanced(struct zone *zone, int order,
 {
 	unsigned long mark = high_wmark_pages(zone) + balance_gap;
 
-	return zone_watermark_ok_safe(zone, order, mark, classzone_idx);
+	if (!zone_watermark_ok_safe(zone, order, mark, classzone_idx))
+		return false;
+
+	/*
+	 * If any eligible zone is balanced then the node is not considered
+	 * to be congested or dirty
+	 */
+	clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags);
+	clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags);
+
+	return true;
 }
 
 /*
@@ -3149,13 +3159,6 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 			if (!zone_balanced(zone, order, 0, 0)) {
 				classzone_idx = i;
 				break;
-			} else {
-				/*
-				 * If any eligible zone is balanced then the
-				 * node is not considered congested or dirty.
-				 */
-				clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags);
-				clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags);
 			}
 		}
 
@@ -3214,11 +3217,8 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 			if (!populated_zone(zone))
 				continue;
 
-			if (zone_balanced(zone, sc.order, 0, classzone_idx)) {
-				clear_bit(PGDAT_CONGESTED, &pgdat->flags);
-				clear_bit(PGDAT_DIRTY, &pgdat->flags);
+			if (zone_balanced(zone, sc.order, 0, classzone_idx))
 				goto out;
-			}
 		}
 
 		/*
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (9 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 10/27] mm, vmscan: Clear congestion, dirty and need for compaction on a per-node basis Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 12/27] mm, vmscan: Make shrink_node decisions more node-centric Mel Gorman
                   ` (9 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

kswapd scans from highest to lowest for a zone that requires balancing.
This was necessary when reclaim was per-zone to fairly age pages on
lower zones. Now that we are reclaiming on a per-node basis, any eligible
zone can be used and pages will still be aged fairly. This patch avoids
reclaiming excessively unless buffer_heads are over the limit and it's
necessary to reclaim from a higher zone than requested by the waker of
kswapd to relieve low memory pressure.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index c62505f9e8be..9752252bdd63 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3139,24 +3139,30 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 
 		sc.nr_reclaimed = 0;
 
-		/* Scan from the highest requested zone to dma */
+		/*
+		 * If the number of buffer_heads in the machine exceeds the
+		 * maximum allowed level and this node has a highmem zone,
+		 * force kswapd to reclaim from it to relieve lowmem pressure.
+		 */
+		if (buffer_heads_over_limit) {
+			for (i = MAX_NR_ZONES - 1; i >= 0; i++) {
+				zone = pgdat->node_zones + i;
+				if (!populated_zone(zone))
+					continue;
+
+				if (is_highmem_idx(i))
+					classzone_idx = i;
+				break;
+			}
+		}
+
+		/* Only reclaim if there are no eligible zones */
 		for (i = classzone_idx; i >= 0; i--) {
 			zone = pgdat->node_zones + i;
 			if (!populated_zone(zone))
 				continue;
 
-			/*
-			 * If the number of buffer_heads in the machine
-			 * exceeds the maximum allowed level and this node
-			 * has a highmem zone, force kswapd to reclaim from
-			 * it to relieve lowmem pressure.
-			 */
-			if (buffer_heads_over_limit && is_highmem_idx(i)) {
-				classzone_idx = i;
-				break;
-			}
-
-			if (!zone_balanced(zone, order, 0, 0)) {
+			if (!zone_balanced(zone, sc.order, 0, classzone_idx)) {
 				classzone_idx = i;
 				break;
 			}
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 12/27] mm, vmscan: Make shrink_node decisions more node-centric
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (10 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman
                   ` (8 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Earlier patches focused on having direct reclaim and kswapd use data that
is node-centric for reclaiming but shrink_node() itself still uses too much
zone information. This patch removes unnecessary zone-based information
with the most important decision being whether to continue reclaim or
not. Some memcg APIs are adjusted as a result even though memcg itself
still uses some zone information.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 include/linux/memcontrol.h |  9 +++----
 include/linux/mmzone.h     |  4 ++--
 include/linux/swap.h       |  2 +-
 mm/memcontrol.c            | 17 +++++++-------
 mm/page_alloc.c            |  2 +-
 mm/vmscan.c                | 58 ++++++++++++++++++++++++++--------------------
 mm/workingset.c            |  6 ++---
 7 files changed, 54 insertions(+), 44 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index f5626a5c88c2..51f4441a69fc 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -306,7 +306,8 @@ void mem_cgroup_uncharge_list(struct list_head *page_list);
 
 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
 
-struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
+struct lruvec *mem_cgroup_lruvec(struct pglist_data *, struct zone *zone,
+				 struct mem_cgroup *);
 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
 
 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
@@ -592,10 +593,10 @@ static inline void mem_cgroup_migrate(struct page *old, struct page *new)
 {
 }
 
-static inline struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
-						    struct mem_cgroup *memcg)
+static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
+				struct zone *zone, struct mem_cgroup *memcg)
 {
-	return zone_lruvec(zone);
+	return node_lruvec(pgdat);
 }
 
 static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index d620cd44ae1b..dc09acedc88d 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -739,9 +739,9 @@ static inline spinlock_t *zone_lru_lock(struct zone *zone)
 	return &zone->zone_pgdat->lru_lock;
 }
 
-static inline struct lruvec *zone_lruvec(struct zone *zone)
+static inline struct lruvec *node_lruvec(struct pglist_data *pgdat)
 {
-	return &zone->zone_pgdat->lruvec;
+	return &pgdat->lruvec;
 }
 
 static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index d18b65c53dbb..601d60e564e6 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -323,7 +323,7 @@ extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
 						  unsigned long nr_pages,
 						  gfp_t gfp_mask,
 						  bool may_swap);
-extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
+extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
 						gfp_t gfp_mask, bool noswap,
 						struct zone *zone,
 						unsigned long *nr_scanned);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 1f4cd3063f89..bdeff4b6f394 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -943,22 +943,23 @@ static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg)
 	     iter = mem_cgroup_iter(NULL, iter, NULL))
 
 /**
- * mem_cgroup_zone_lruvec - get the lru list vector for a zone and memcg
+ * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
+ * @node: node of the wanted lruvec
  * @zone: zone of the wanted lruvec
  * @memcg: memcg of the wanted lruvec
  *
- * Returns the lru list vector holding pages for the given @zone and
- * @mem.  This can be the global zone lruvec, if the memory controller
+ * Returns the lru list vector holding pages for a given @node or a given
+ * @memcg and @zone. This can be the node lruvec, if the memory controller
  * is disabled.
  */
-struct lruvec *mem_cgroup_zone_lruvec(struct zone *zone,
-				      struct mem_cgroup *memcg)
+struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
+				 struct zone *zone, struct mem_cgroup *memcg)
 {
 	struct mem_cgroup_per_zone *mz;
 	struct lruvec *lruvec;
 
 	if (mem_cgroup_disabled()) {
-		lruvec = zone_lruvec(zone);
+		lruvec = node_lruvec(pgdat);
 		goto out;
 	}
 
@@ -1451,8 +1452,8 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
 			}
 			continue;
 		}
-		total += mem_cgroup_shrink_node_zone(victim, gfp_mask, false,
-						     zone, &nr_scanned);
+		total += mem_cgroup_shrink_node(victim, gfp_mask, false,
+					zone, &nr_scanned);
 		*total_scanned += nr_scanned;
 		if (!soft_limit_excess(root_memcg))
 			break;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 71a112721935..35d10dabc304 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5476,6 +5476,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 	init_waitqueue_head(&pgdat->kcompactd_wait);
 #endif
 	pgdat_page_ext_init(pgdat);
+	lruvec_init(node_lruvec(pgdat));
 
 	for (j = 0; j < MAX_NR_ZONES; j++) {
 		struct zone *zone = pgdat->node_zones + j;
@@ -5539,7 +5540,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 		/* For bootup, initialized properly in watermark setup */
 		mod_zone_page_state(zone, NR_ALLOC_BATCH, zone->managed_pages);
 
-		lruvec_init(zone_lruvec(zone));
 		if (!size)
 			continue;
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9752252bdd63..403559a25c54 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2219,10 +2219,11 @@ static inline void init_tlb_ubc(void)
 /*
  * This is a basic per-zone page freer.  Used by both kswapd and direct reclaim.
  */
-static void shrink_zone_memcg(struct zone *zone, struct mem_cgroup *memcg,
+static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memcg,
 			      struct scan_control *sc, unsigned long *lru_pages)
 {
-	struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+	struct zone *zone = &pgdat->node_zones[sc->reclaim_idx];
+	struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, zone, memcg);
 	unsigned long nr[NR_LRU_LISTS];
 	unsigned long targets[NR_LRU_LISTS];
 	unsigned long nr_to_scan;
@@ -2355,13 +2356,14 @@ static bool in_reclaim_compaction(struct scan_control *sc)
  * calls try_to_compact_zone() that it will have enough free pages to succeed.
  * It will give up earlier than that if there is difficulty reclaiming pages.
  */
-static inline bool should_continue_reclaim(struct zone *zone,
+static inline bool should_continue_reclaim(struct pglist_data *pgdat,
 					unsigned long nr_reclaimed,
 					unsigned long nr_scanned,
 					struct scan_control *sc)
 {
 	unsigned long pages_for_compaction;
 	unsigned long inactive_lru_pages;
+	int z;
 
 	/* If not in reclaim/compaction mode, stop */
 	if (!in_reclaim_compaction(sc))
@@ -2395,21 +2397,27 @@ static inline bool should_continue_reclaim(struct zone *zone,
 	 * inactive lists are large enough, continue reclaiming
 	 */
 	pages_for_compaction = (2UL << sc->order);
-	inactive_lru_pages = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE);
+	inactive_lru_pages = node_page_state(pgdat, NR_INACTIVE_FILE);
 	if (get_nr_swap_pages() > 0)
-		inactive_lru_pages += node_page_state(zone->zone_pgdat, NR_INACTIVE_ANON);
+		inactive_lru_pages += node_page_state(pgdat, NR_INACTIVE_ANON);
 	if (sc->nr_reclaimed < pages_for_compaction &&
 			inactive_lru_pages > pages_for_compaction)
 		return true;
 
 	/* If compaction would go ahead or the allocation would succeed, stop */
-	switch (compaction_suitable(zone, sc->order, 0, 0)) {
-	case COMPACT_PARTIAL:
-	case COMPACT_CONTINUE:
-		return false;
-	default:
-		return true;
+	for (z = 0; z <= sc->reclaim_idx; z++) {
+		struct zone *zone = &pgdat->node_zones[z];
+
+		switch (compaction_suitable(zone, sc->order, 0, 0)) {
+		case COMPACT_PARTIAL:
+		case COMPACT_CONTINUE:
+			return false;
+		default:
+			/* check next zone */
+			;
+		}
 	}
+	return true;
 }
 
 static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
@@ -2418,15 +2426,14 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
 	struct reclaim_state *reclaim_state = current->reclaim_state;
 	unsigned long nr_reclaimed, nr_scanned;
 	bool reclaimable = false;
-	struct zone *zone = &pgdat->node_zones[classzone_idx];
 
 	do {
 		struct mem_cgroup *root = sc->target_mem_cgroup;
 		struct mem_cgroup_reclaim_cookie reclaim = {
-			.zone = zone,
+			.zone = &pgdat->node_zones[classzone_idx],
 			.priority = sc->priority,
 		};
-		unsigned long zone_lru_pages = 0;
+		unsigned long node_lru_pages = 0;
 		struct mem_cgroup *memcg;
 
 		nr_reclaimed = sc->nr_reclaimed;
@@ -2447,11 +2454,11 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
 			reclaimed = sc->nr_reclaimed;
 			scanned = sc->nr_scanned;
 
-			shrink_zone_memcg(zone, memcg, sc, &lru_pages);
-			zone_lru_pages += lru_pages;
+			shrink_node_memcg(pgdat, memcg, sc, &lru_pages);
+			node_lru_pages += lru_pages;
 
 			if (!global_reclaim(sc) && sc->reclaim_idx == classzone_idx)
-				shrink_slab(sc->gfp_mask, zone_to_nid(zone),
+				shrink_slab(sc->gfp_mask, pgdat->node_id,
 					    memcg, sc->nr_scanned - scanned,
 					    lru_pages);
 
@@ -2463,7 +2470,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
 			/*
 			 * Direct reclaim and kswapd have to scan all memory
 			 * cgroups to fulfill the overall scan target for the
-			 * zone.
+			 * node.
 			 *
 			 * Limit reclaim, on the other hand, only cares about
 			 * nr_to_reclaim pages to be reclaimed and it will
@@ -2482,9 +2489,9 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
 		 * the eligible LRU pages were scanned.
 		 */
 		if (global_reclaim(sc) && sc->reclaim_idx == classzone_idx)
-			shrink_slab(sc->gfp_mask, zone_to_nid(zone), NULL,
+			shrink_slab(sc->gfp_mask, pgdat->node_id, NULL,
 				    sc->nr_scanned - nr_scanned,
-				    zone_lru_pages);
+				    node_lru_pages);
 
 		if (reclaim_state) {
 			sc->nr_reclaimed += reclaim_state->reclaimed_slab;
@@ -2499,7 +2506,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
 		if (sc->nr_reclaimed - nr_reclaimed)
 			reclaimable = true;
 
-	} while (should_continue_reclaim(zone, sc->nr_reclaimed - nr_reclaimed,
+	} while (should_continue_reclaim(pgdat, sc->nr_reclaimed - nr_reclaimed,
 					 sc->nr_scanned - nr_scanned, sc));
 
 	return reclaimable;
@@ -2902,7 +2909,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 
 #ifdef CONFIG_MEMCG
 
-unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
+unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
 						gfp_t gfp_mask, bool noswap,
 						struct zone *zone,
 						unsigned long *nr_scanned)
@@ -2912,6 +2919,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
 		.target_mem_cgroup = memcg,
 		.may_writepage = !laptop_mode,
 		.may_unmap = 1,
+		.reclaim_idx = zone_idx(zone),
 		.may_swap = !noswap,
 	};
 	unsigned long lru_pages;
@@ -2926,11 +2934,11 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg,
 	/*
 	 * NOTE: Although we can get the priority field, using it
 	 * here is not a good idea, since it limits the pages we can scan.
-	 * if we don't reclaim here, the shrink_zone from balance_pgdat
+	 * if we don't reclaim here, the shrink_node from balance_pgdat
 	 * will pick up pages from other mem cgroup's as well. We hack
 	 * the priority and make it zero.
 	 */
-	shrink_zone_memcg(zone, memcg, &sc, &lru_pages);
+	shrink_node_memcg(zone->zone_pgdat, memcg, &sc, &lru_pages);
 
 	trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
 
@@ -2988,7 +2996,7 @@ static void age_active_anon(struct pglist_data *pgdat,
 
 	memcg = mem_cgroup_iter(NULL, NULL, NULL);
 	do {
-		struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+		struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, zone, memcg);
 
 		if (inactive_anon_is_low(lruvec))
 			shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
diff --git a/mm/workingset.c b/mm/workingset.c
index 173399b239be..f68cc74a7795 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -218,7 +218,7 @@ void *workingset_eviction(struct address_space *mapping, struct page *page)
 	VM_BUG_ON_PAGE(page_count(page), page);
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
 
-	lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, zone, memcg);
 	eviction = atomic_long_inc_return(&lruvec->inactive_age);
 	return pack_shadow(memcgid, zone, eviction);
 }
@@ -267,7 +267,7 @@ bool workingset_refault(void *shadow)
 		rcu_read_unlock();
 		return false;
 	}
-	lruvec = mem_cgroup_zone_lruvec(zone, memcg);
+	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, zone, memcg);
 	refault = atomic_long_read(&lruvec->inactive_age);
 	active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE);
 	rcu_read_unlock();
@@ -317,7 +317,7 @@ void workingset_activation(struct page *page)
 	 */
 	if (!mem_cgroup_disabled() && !page_memcg(page))
 		goto out;
-	lruvec = mem_cgroup_zone_lruvec(page_zone(page), page_memcg(page));
+	lruvec = mem_cgroup_lruvec(page_zone(page)->zone_pgdat, page_zone(page), page_memcg(page));
 	atomic_long_inc(&lruvec->inactive_age);
 out:
 	unlock_page_memcg(page);
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones to nodes
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (11 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 12/27] mm, vmscan: Make shrink_node decisions more node-centric Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 14/27] mm, workingset: Make working set detection node-aware Mel Gorman
                   ` (7 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Memcg was broken by the move of all LRUs to nodes because it is tracking
limits on a per-zone basis while receiving reclaim requests on a per-node
basis. This patch moves limit enforcement to the nodes. Technically, all
the variable names should also change but people are already familiar by
the meaning of "mz" even if "mn" would be a more appropriate name now.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 include/linux/memcontrol.h |  21 ++---
 include/linux/swap.h       |   2 +-
 mm/memcontrol.c            | 204 +++++++++++++++++++--------------------------
 mm/vmscan.c                |  21 +++--
 mm/workingset.c            |   6 +-
 5 files changed, 110 insertions(+), 144 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 51f4441a69fc..96b973e567f6 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -60,7 +60,7 @@ enum mem_cgroup_stat_index {
 };
 
 struct mem_cgroup_reclaim_cookie {
-	struct zone *zone;
+	pg_data_t *pgdat;
 	int priority;
 	unsigned int generation;
 };
@@ -113,7 +113,7 @@ struct mem_cgroup_reclaim_iter {
 /*
  * per-zone information in memory controller.
  */
-struct mem_cgroup_per_zone {
+struct mem_cgroup_per_node {
 	struct lruvec		lruvec;
 	unsigned long		lru_size[NR_LRU_LISTS];
 
@@ -127,10 +127,6 @@ struct mem_cgroup_per_zone {
 						/* use container_of	   */
 };
 
-struct mem_cgroup_per_node {
-	struct mem_cgroup_per_zone zoneinfo[MAX_NR_ZONES];
-};
-
 struct mem_cgroup_threshold {
 	struct eventfd_ctx *eventfd;
 	unsigned long threshold;
@@ -306,8 +302,7 @@ void mem_cgroup_uncharge_list(struct list_head *page_list);
 
 void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
 
-struct lruvec *mem_cgroup_lruvec(struct pglist_data *, struct zone *zone,
-				 struct mem_cgroup *);
+struct lruvec *mem_cgroup_lruvec(struct pglist_data *, struct mem_cgroup *);
 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
 
 bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
@@ -410,9 +405,9 @@ unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
 static inline
 unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
 {
-	struct mem_cgroup_per_zone *mz;
+	struct mem_cgroup_per_node *mz;
 
-	mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
+	mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
 	return mz->lru_size[lru];
 }
 
@@ -502,7 +497,7 @@ static inline void mem_cgroup_dec_page_stat(struct page *page,
 	mem_cgroup_update_page_stat(page, idx, -1);
 }
 
-unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
+unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 						gfp_t gfp_mask,
 						unsigned long *total_scanned);
 
@@ -594,7 +589,7 @@ static inline void mem_cgroup_migrate(struct page *old, struct page *new)
 }
 
 static inline struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
-				struct zone *zone, struct mem_cgroup *memcg)
+				struct mem_cgroup *memcg)
 {
 	return node_lruvec(pgdat);
 }
@@ -718,7 +713,7 @@ static inline void mem_cgroup_dec_page_stat(struct page *page,
 }
 
 static inline
-unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
+unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 					    gfp_t gfp_mask,
 					    unsigned long *total_scanned)
 {
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 601d60e564e6..8d82d1f9d268 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -325,7 +325,7 @@ extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
 						  bool may_swap);
 extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
 						gfp_t gfp_mask, bool noswap,
-						struct zone *zone,
+						pg_data_t *pgdat,
 						unsigned long *nr_scanned);
 extern unsigned long shrink_all_memory(unsigned long nr_pages);
 extern int vm_swappiness;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index bdeff4b6f394..7ee9f9f727dc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -132,15 +132,11 @@ static const char * const mem_cgroup_lru_names[] = {
  * their hierarchy representation
  */
 
-struct mem_cgroup_tree_per_zone {
+struct mem_cgroup_tree_per_node {
 	struct rb_root rb_root;
 	spinlock_t lock;
 };
 
-struct mem_cgroup_tree_per_node {
-	struct mem_cgroup_tree_per_zone rb_tree_per_zone[MAX_NR_ZONES];
-};
-
 struct mem_cgroup_tree {
 	struct mem_cgroup_tree_per_node *rb_tree_per_node[MAX_NUMNODES];
 };
@@ -322,13 +318,10 @@ EXPORT_SYMBOL(memcg_kmem_enabled_key);
 
 #endif /* !CONFIG_SLOB */
 
-static struct mem_cgroup_per_zone *
-mem_cgroup_zone_zoneinfo(struct mem_cgroup *memcg, struct zone *zone)
+static struct mem_cgroup_per_node *
+mem_cgroup_nodeinfo(struct mem_cgroup *memcg, pg_data_t *pgdat)
 {
-	int nid = zone_to_nid(zone);
-	int zid = zone_idx(zone);
-
-	return &memcg->nodeinfo[nid]->zoneinfo[zid];
+	return memcg->nodeinfo[pgdat->node_id];
 }
 
 /**
@@ -382,37 +375,35 @@ ino_t page_cgroup_ino(struct page *page)
 	return ino;
 }
 
-static struct mem_cgroup_per_zone *
+static struct mem_cgroup_per_node *
 mem_cgroup_page_zoneinfo(struct mem_cgroup *memcg, struct page *page)
 {
 	int nid = page_to_nid(page);
-	int zid = page_zonenum(page);
 
-	return &memcg->nodeinfo[nid]->zoneinfo[zid];
+	return memcg->nodeinfo[nid];
 }
 
-static struct mem_cgroup_tree_per_zone *
-soft_limit_tree_node_zone(int nid, int zid)
+static struct mem_cgroup_tree_per_node *
+soft_limit_tree_node(int nid)
 {
-	return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
+	return soft_limit_tree.rb_tree_per_node[nid];
 }
 
-static struct mem_cgroup_tree_per_zone *
+static struct mem_cgroup_tree_per_node *
 soft_limit_tree_from_page(struct page *page)
 {
 	int nid = page_to_nid(page);
-	int zid = page_zonenum(page);
 
-	return &soft_limit_tree.rb_tree_per_node[nid]->rb_tree_per_zone[zid];
+	return soft_limit_tree.rb_tree_per_node[nid];
 }
 
-static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_zone *mz,
-					 struct mem_cgroup_tree_per_zone *mctz,
+static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_node *mz,
+					 struct mem_cgroup_tree_per_node *mctz,
 					 unsigned long new_usage_in_excess)
 {
 	struct rb_node **p = &mctz->rb_root.rb_node;
 	struct rb_node *parent = NULL;
-	struct mem_cgroup_per_zone *mz_node;
+	struct mem_cgroup_per_node *mz_node;
 
 	if (mz->on_tree)
 		return;
@@ -422,7 +413,7 @@ static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_zone *mz,
 		return;
 	while (*p) {
 		parent = *p;
-		mz_node = rb_entry(parent, struct mem_cgroup_per_zone,
+		mz_node = rb_entry(parent, struct mem_cgroup_per_node,
 					tree_node);
 		if (mz->usage_in_excess < mz_node->usage_in_excess)
 			p = &(*p)->rb_left;
@@ -438,8 +429,8 @@ static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_zone *mz,
 	mz->on_tree = true;
 }
 
-static void __mem_cgroup_remove_exceeded(struct mem_cgroup_per_zone *mz,
-					 struct mem_cgroup_tree_per_zone *mctz)
+static void __mem_cgroup_remove_exceeded(struct mem_cgroup_per_node *mz,
+					 struct mem_cgroup_tree_per_node *mctz)
 {
 	if (!mz->on_tree)
 		return;
@@ -447,8 +438,8 @@ static void __mem_cgroup_remove_exceeded(struct mem_cgroup_per_zone *mz,
 	mz->on_tree = false;
 }
 
-static void mem_cgroup_remove_exceeded(struct mem_cgroup_per_zone *mz,
-				       struct mem_cgroup_tree_per_zone *mctz)
+static void mem_cgroup_remove_exceeded(struct mem_cgroup_per_node *mz,
+				       struct mem_cgroup_tree_per_node *mctz)
 {
 	unsigned long flags;
 
@@ -472,8 +463,8 @@ static unsigned long soft_limit_excess(struct mem_cgroup *memcg)
 static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
 {
 	unsigned long excess;
-	struct mem_cgroup_per_zone *mz;
-	struct mem_cgroup_tree_per_zone *mctz;
+	struct mem_cgroup_per_node *mz;
+	struct mem_cgroup_tree_per_node *mctz;
 
 	mctz = soft_limit_tree_from_page(page);
 	/*
@@ -506,24 +497,22 @@ static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
 
 static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg)
 {
-	struct mem_cgroup_tree_per_zone *mctz;
-	struct mem_cgroup_per_zone *mz;
-	int nid, zid;
+	struct mem_cgroup_tree_per_node *mctz;
+	struct mem_cgroup_per_node *mz;
+	int nid;
 
 	for_each_node(nid) {
-		for (zid = 0; zid < MAX_NR_ZONES; zid++) {
-			mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
-			mctz = soft_limit_tree_node_zone(nid, zid);
-			mem_cgroup_remove_exceeded(mz, mctz);
-		}
+		mz = mem_cgroup_nodeinfo(memcg, NODE_DATA(nid));
+		mctz = soft_limit_tree_node(nid);
+		mem_cgroup_remove_exceeded(mz, mctz);
 	}
 }
 
-static struct mem_cgroup_per_zone *
-__mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
+static struct mem_cgroup_per_node *
+__mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
 {
 	struct rb_node *rightmost = NULL;
-	struct mem_cgroup_per_zone *mz;
+	struct mem_cgroup_per_node *mz;
 
 retry:
 	mz = NULL;
@@ -531,7 +520,7 @@ __mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
 	if (!rightmost)
 		goto done;		/* Nothing to reclaim from */
 
-	mz = rb_entry(rightmost, struct mem_cgroup_per_zone, tree_node);
+	mz = rb_entry(rightmost, struct mem_cgroup_per_node, tree_node);
 	/*
 	 * Remove the node now but someone else can add it back,
 	 * we will to add it back at the end of reclaim to its correct
@@ -545,10 +534,10 @@ __mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
 	return mz;
 }
 
-static struct mem_cgroup_per_zone *
-mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
+static struct mem_cgroup_per_node *
+mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_node *mctz)
 {
-	struct mem_cgroup_per_zone *mz;
+	struct mem_cgroup_per_node *mz;
 
 	spin_lock_irq(&mctz->lock);
 	mz = __mem_cgroup_largest_soft_limit_node(mctz);
@@ -642,20 +631,16 @@ unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
 					   int nid, unsigned int lru_mask)
 {
 	unsigned long nr = 0;
-	int zid;
+	struct mem_cgroup_per_node *mz;
+	enum lru_list lru;
 
 	VM_BUG_ON((unsigned)nid >= nr_node_ids);
 
-	for (zid = 0; zid < MAX_NR_ZONES; zid++) {
-		struct mem_cgroup_per_zone *mz;
-		enum lru_list lru;
-
-		for_each_lru(lru) {
-			if (!(BIT(lru) & lru_mask))
-				continue;
-			mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
-			nr += mz->lru_size[lru];
-		}
+	for_each_lru(lru) {
+		if (!(BIT(lru) & lru_mask))
+			continue;
+		mz = mem_cgroup_nodeinfo(memcg, NODE_DATA(nid));
+		nr += mz->lru_size[lru];
 	}
 	return nr;
 }
@@ -808,9 +793,9 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
 	rcu_read_lock();
 
 	if (reclaim) {
-		struct mem_cgroup_per_zone *mz;
+		struct mem_cgroup_per_node *mz;
 
-		mz = mem_cgroup_zone_zoneinfo(root, reclaim->zone);
+		mz = mem_cgroup_nodeinfo(root, reclaim->pgdat);
 		iter = &mz->iter[reclaim->priority];
 
 		if (prev && reclaim->generation != iter->generation)
@@ -909,19 +894,17 @@ static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg)
 {
 	struct mem_cgroup *memcg = dead_memcg;
 	struct mem_cgroup_reclaim_iter *iter;
-	struct mem_cgroup_per_zone *mz;
-	int nid, zid;
+	struct mem_cgroup_per_node *mz;
+	int nid;
 	int i;
 
 	while ((memcg = parent_mem_cgroup(memcg))) {
 		for_each_node(nid) {
-			for (zid = 0; zid < MAX_NR_ZONES; zid++) {
-				mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
-				for (i = 0; i <= DEF_PRIORITY; i++) {
-					iter = &mz->iter[i];
-					cmpxchg(&iter->position,
-						dead_memcg, NULL);
-				}
+			mz = mem_cgroup_nodeinfo(memcg, NODE_DATA(nid));
+			for (i = 0; i <= DEF_PRIORITY; i++) {
+				iter = &mz->iter[i];
+				cmpxchg(&iter->position,
+					dead_memcg, NULL);
 			}
 		}
 	}
@@ -945,7 +928,6 @@ static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg)
 /**
  * mem_cgroup_lruvec - get the lru list vector for a node or a memcg zone
  * @node: node of the wanted lruvec
- * @zone: zone of the wanted lruvec
  * @memcg: memcg of the wanted lruvec
  *
  * Returns the lru list vector holding pages for a given @node or a given
@@ -953,9 +935,9 @@ static void invalidate_reclaim_iterators(struct mem_cgroup *dead_memcg)
  * is disabled.
  */
 struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
-				 struct zone *zone, struct mem_cgroup *memcg)
+				 struct mem_cgroup *memcg)
 {
-	struct mem_cgroup_per_zone *mz;
+	struct mem_cgroup_per_node *mz;
 	struct lruvec *lruvec;
 
 	if (mem_cgroup_disabled()) {
@@ -963,7 +945,7 @@ struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
 		goto out;
 	}
 
-	mz = mem_cgroup_zone_zoneinfo(memcg, zone);
+	mz = mem_cgroup_nodeinfo(memcg, pgdat);
 	lruvec = &mz->lruvec;
 out:
 	/*
@@ -971,8 +953,8 @@ struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
 	 * we have to be prepared to initialize lruvec->zone here;
 	 * and if offlined then reonlined, we need to reinitialize it.
 	 */
-	if (unlikely(lruvec->pgdat != zone->zone_pgdat))
-		lruvec->pgdat = zone->zone_pgdat;
+	if (unlikely(lruvec->pgdat != pgdat))
+		lruvec->pgdat = pgdat;
 	return lruvec;
 }
 
@@ -987,7 +969,7 @@ struct lruvec *mem_cgroup_lruvec(struct pglist_data *pgdat,
  */
 struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgdat)
 {
-	struct mem_cgroup_per_zone *mz;
+	struct mem_cgroup_per_node *mz;
 	struct mem_cgroup *memcg;
 	struct lruvec *lruvec;
 
@@ -1029,13 +1011,13 @@ struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgd
 void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
 				int nr_pages)
 {
-	struct mem_cgroup_per_zone *mz;
+	struct mem_cgroup_per_node *mz;
 	unsigned long *lru_size;
 
 	if (mem_cgroup_disabled())
 		return;
 
-	mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
+	mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
 	lru_size = mz->lru_size + lru;
 	*lru_size += nr_pages;
 	VM_BUG_ON((long)(*lru_size) < 0);
@@ -1412,7 +1394,7 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
 #endif
 
 static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
-				   struct zone *zone,
+				   pg_data_t *pgdat,
 				   gfp_t gfp_mask,
 				   unsigned long *total_scanned)
 {
@@ -1422,7 +1404,7 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
 	unsigned long excess;
 	unsigned long nr_scanned;
 	struct mem_cgroup_reclaim_cookie reclaim = {
-		.zone = zone,
+		.pgdat = pgdat,
 		.priority = 0,
 	};
 
@@ -1453,7 +1435,7 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
 			continue;
 		}
 		total += mem_cgroup_shrink_node(victim, gfp_mask, false,
-					zone, &nr_scanned);
+					pgdat, &nr_scanned);
 		*total_scanned += nr_scanned;
 		if (!soft_limit_excess(root_memcg))
 			break;
@@ -2545,22 +2527,22 @@ static int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
 	return ret;
 }
 
-unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
+unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 					    gfp_t gfp_mask,
 					    unsigned long *total_scanned)
 {
 	unsigned long nr_reclaimed = 0;
-	struct mem_cgroup_per_zone *mz, *next_mz = NULL;
+	struct mem_cgroup_per_node *mz, *next_mz = NULL;
 	unsigned long reclaimed;
 	int loop = 0;
-	struct mem_cgroup_tree_per_zone *mctz;
+	struct mem_cgroup_tree_per_node *mctz;
 	unsigned long excess;
 	unsigned long nr_scanned;
 
 	if (order > 0)
 		return 0;
 
-	mctz = soft_limit_tree_node_zone(zone_to_nid(zone), zone_idx(zone));
+	mctz = soft_limit_tree_node(pgdat->node_id);
 	/*
 	 * This loop can run a while, specially if mem_cgroup's continuously
 	 * keep exceeding their soft limit and putting the system under
@@ -2575,7 +2557,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,
 			break;
 
 		nr_scanned = 0;
-		reclaimed = mem_cgroup_soft_reclaim(mz->memcg, zone,
+		reclaimed = mem_cgroup_soft_reclaim(mz->memcg, pgdat,
 						    gfp_mask, &nr_scanned);
 		nr_reclaimed += reclaimed;
 		*total_scanned += nr_scanned;
@@ -3194,22 +3176,21 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 
 #ifdef CONFIG_DEBUG_VM
 	{
-		int nid, zid;
-		struct mem_cgroup_per_zone *mz;
+		pg_data_t *pgdat;
+		struct mem_cgroup_per_node *mz;
 		struct zone_reclaim_stat *rstat;
 		unsigned long recent_rotated[2] = {0, 0};
 		unsigned long recent_scanned[2] = {0, 0};
 
-		for_each_online_node(nid)
-			for (zid = 0; zid < MAX_NR_ZONES; zid++) {
-				mz = &memcg->nodeinfo[nid]->zoneinfo[zid];
-				rstat = &mz->lruvec.reclaim_stat;
+		for_each_online_pgdat(pgdat) {
+			mz = mem_cgroup_nodeinfo(memcg, pgdat);
+			rstat = &mz->lruvec.reclaim_stat;
 
-				recent_rotated[0] += rstat->recent_rotated[0];
-				recent_rotated[1] += rstat->recent_rotated[1];
-				recent_scanned[0] += rstat->recent_scanned[0];
-				recent_scanned[1] += rstat->recent_scanned[1];
-			}
+			recent_rotated[0] += rstat->recent_rotated[0];
+			recent_rotated[1] += rstat->recent_rotated[1];
+			recent_scanned[0] += rstat->recent_scanned[0];
+			recent_scanned[1] += rstat->recent_scanned[1];
+		}
 		seq_printf(m, "recent_rotated_anon %lu\n", recent_rotated[0]);
 		seq_printf(m, "recent_rotated_file %lu\n", recent_rotated[1]);
 		seq_printf(m, "recent_scanned_anon %lu\n", recent_scanned[0]);
@@ -4035,11 +4016,10 @@ static struct cftype mem_cgroup_legacy_files[] = {
 	{ },	/* terminate */
 };
 
-static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
+static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 {
 	struct mem_cgroup_per_node *pn;
-	struct mem_cgroup_per_zone *mz;
-	int zone, tmp = node;
+	int tmp = node;
 	/*
 	 * This routine is called against possible nodes.
 	 * But it's BUG to call kmalloc() against offline node.
@@ -4054,18 +4034,16 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 	if (!pn)
 		return 1;
 
-	for (zone = 0; zone < MAX_NR_ZONES; zone++) {
-		mz = &pn->zoneinfo[zone];
-		lruvec_init(&mz->lruvec);
-		mz->usage_in_excess = 0;
-		mz->on_tree = false;
-		mz->memcg = memcg;
-	}
+	lruvec_init(&pn->lruvec);
+	pn->usage_in_excess = 0;
+	pn->on_tree = false;
+	pn->memcg = memcg;
+
 	memcg->nodeinfo[node] = pn;
 	return 0;
 }
 
-static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
+static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 {
 	kfree(memcg->nodeinfo[node]);
 }
@@ -4076,7 +4054,7 @@ static void mem_cgroup_free(struct mem_cgroup *memcg)
 
 	memcg_wb_domain_exit(memcg);
 	for_each_node(node)
-		free_mem_cgroup_per_zone_info(memcg, node);
+		free_mem_cgroup_per_node_info(memcg, node);
 	free_percpu(memcg->stat);
 	kfree(memcg);
 }
@@ -4099,7 +4077,7 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
 		goto fail;
 
 	for_each_node(node)
-		if (alloc_mem_cgroup_per_zone_info(memcg, node))
+		if (alloc_mem_cgroup_per_node_info(memcg, node))
 			goto fail;
 
 	if (memcg_wb_domain_init(memcg, GFP_KERNEL))
@@ -5688,18 +5666,12 @@ static int __init mem_cgroup_init(void)
 
 	for_each_node(node) {
 		struct mem_cgroup_tree_per_node *rtpn;
-		int zone;
 
 		rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
 				    node_online(node) ? node : NUMA_NO_NODE);
 
-		for (zone = 0; zone < MAX_NR_ZONES; zone++) {
-			struct mem_cgroup_tree_per_zone *rtpz;
-
-			rtpz = &rtpn->rb_tree_per_zone[zone];
-			rtpz->rb_root = RB_ROOT;
-			spin_lock_init(&rtpz->lock);
-		}
+		rtpn->rb_root = RB_ROOT;
+		spin_lock_init(&rtpn->lock);
 		soft_limit_tree.rb_tree_per_node[node] = rtpn;
 	}
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 403559a25c54..09e557c95731 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2222,8 +2222,7 @@ static inline void init_tlb_ubc(void)
 static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memcg,
 			      struct scan_control *sc, unsigned long *lru_pages)
 {
-	struct zone *zone = &pgdat->node_zones[sc->reclaim_idx];
-	struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, zone, memcg);
+	struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
 	unsigned long nr[NR_LRU_LISTS];
 	unsigned long targets[NR_LRU_LISTS];
 	unsigned long nr_to_scan;
@@ -2430,7 +2429,7 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc,
 	do {
 		struct mem_cgroup *root = sc->target_mem_cgroup;
 		struct mem_cgroup_reclaim_cookie reclaim = {
-			.zone = &pgdat->node_zones[classzone_idx],
+			.pgdat = pgdat,
 			.priority = sc->priority,
 		};
 		unsigned long node_lru_pages = 0;
@@ -2630,7 +2629,7 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
 			 * and balancing, not for a memcg's limit.
 			 */
 			nr_soft_scanned = 0;
-			nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone,
+			nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone->zone_pgdat,
 						sc->order, sc->gfp_mask,
 						&nr_soft_scanned);
 			sc->nr_reclaimed += nr_soft_reclaimed;
@@ -2911,7 +2910,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 
 unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
 						gfp_t gfp_mask, bool noswap,
-						struct zone *zone,
+						pg_data_t *pgdat,
 						unsigned long *nr_scanned)
 {
 	struct scan_control sc = {
@@ -2919,7 +2918,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
 		.target_mem_cgroup = memcg,
 		.may_writepage = !laptop_mode,
 		.may_unmap = 1,
-		.reclaim_idx = zone_idx(zone),
+		.reclaim_idx = MAX_NR_ZONES - 1,
 		.may_swap = !noswap,
 	};
 	unsigned long lru_pages;
@@ -2938,7 +2937,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg,
 	 * will pick up pages from other mem cgroup's as well. We hack
 	 * the priority and make it zero.
 	 */
-	shrink_node_memcg(zone->zone_pgdat, memcg, &sc, &lru_pages);
+	shrink_node_memcg(pgdat, memcg, &sc, &lru_pages);
 
 	trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed);
 
@@ -2987,7 +2986,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
 #endif
 
 static void age_active_anon(struct pglist_data *pgdat,
-				struct zone *zone, struct scan_control *sc)
+				struct scan_control *sc)
 {
 	struct mem_cgroup *memcg;
 
@@ -2996,7 +2995,7 @@ static void age_active_anon(struct pglist_data *pgdat,
 
 	memcg = mem_cgroup_iter(NULL, NULL, NULL);
 	do {
-		struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, zone, memcg);
+		struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
 
 		if (inactive_anon_is_low(lruvec))
 			shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
@@ -3185,7 +3184,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 		 * pages are rotated regardless of classzone as this is
 		 * about consistent aging.
 		 */
-		age_active_anon(pgdat, &pgdat->node_zones[MAX_NR_ZONES - 1], &sc);
+		age_active_anon(pgdat, &sc);
 
 		/*
 		 * If we're getting trouble reclaiming, start doing writepage
@@ -3197,7 +3196,7 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
 		/* Call soft limit reclaim before calling shrink_node. */
 		sc.nr_scanned = 0;
 		nr_soft_scanned = 0;
-		nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(zone, sc.order,
+		nr_soft_reclaimed = mem_cgroup_soft_limit_reclaim(pgdat, sc.order,
 						sc.gfp_mask, &nr_soft_scanned);
 		sc.nr_reclaimed += nr_soft_reclaimed;
 
diff --git a/mm/workingset.c b/mm/workingset.c
index f68cc74a7795..d06d69670b5d 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -218,7 +218,7 @@ void *workingset_eviction(struct address_space *mapping, struct page *page)
 	VM_BUG_ON_PAGE(page_count(page), page);
 	VM_BUG_ON_PAGE(!PageLocked(page), page);
 
-	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, zone, memcg);
+	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, memcg);
 	eviction = atomic_long_inc_return(&lruvec->inactive_age);
 	return pack_shadow(memcgid, zone, eviction);
 }
@@ -267,7 +267,7 @@ bool workingset_refault(void *shadow)
 		rcu_read_unlock();
 		return false;
 	}
-	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, zone, memcg);
+	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, memcg);
 	refault = atomic_long_read(&lruvec->inactive_age);
 	active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE);
 	rcu_read_unlock();
@@ -317,7 +317,7 @@ void workingset_activation(struct page *page)
 	 */
 	if (!mem_cgroup_disabled() && !page_memcg(page))
 		goto out;
-	lruvec = mem_cgroup_lruvec(page_zone(page)->zone_pgdat, page_zone(page), page_memcg(page));
+	lruvec = mem_cgroup_lruvec(page_zone(page)->zone_pgdat, page_memcg(page));
 	atomic_long_inc(&lruvec->inactive_age);
 out:
 	unlock_page_memcg(page);
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 14/27] mm, workingset: Make working set detection node-aware
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (12 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman
                   ` (6 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Working set and refault detection is still zone-based, fix it.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
---
 include/linux/mmzone.h |  6 +++---
 include/linux/vmstat.h |  1 -
 mm/vmstat.c            | 20 +++-----------------
 mm/workingset.c        | 39 ++++++++++++++++++---------------------
 4 files changed, 24 insertions(+), 42 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index dc09acedc88d..ace553a21547 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -146,9 +146,6 @@ enum zone_stat_item {
 	NUMA_LOCAL,		/* allocation from local node */
 	NUMA_OTHER,		/* allocation from other node */
 #endif
-	WORKINGSET_REFAULT,
-	WORKINGSET_ACTIVATE,
-	WORKINGSET_NODERECLAIM,
 	NR_ANON_TRANSPARENT_HUGEPAGES,
 	NR_FREE_CMA_PAGES,
 	NR_VM_ZONE_STAT_ITEMS };
@@ -163,6 +160,9 @@ enum node_stat_item {
 	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */
 	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */
 	NR_PAGES_SCANNED,	/* pages scanned since last reclaim */
+	WORKINGSET_REFAULT,
+	WORKINGSET_ACTIVATE,
+	WORKINGSET_NODERECLAIM,
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 8a43f7b80c20..ea00884ac8a0 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -232,7 +232,6 @@ void mod_node_page_state(struct pglist_data *, enum node_stat_item, long);
 void inc_node_page_state(struct page *, enum node_stat_item);
 void dec_node_page_state(struct page *, enum node_stat_item);
 
-extern void inc_zone_state(struct zone *, enum zone_stat_item);
 extern void inc_node_state(struct pglist_data *, enum node_stat_item);
 extern void __inc_zone_state(struct zone *, enum zone_stat_item);
 extern void __inc_node_state(struct pglist_data *, enum node_stat_item);
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5c1b0e1108d6..80a75f8ede5b 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -433,11 +433,6 @@ void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
 }
 EXPORT_SYMBOL(mod_zone_page_state);
 
-void inc_zone_state(struct zone *zone, enum zone_stat_item item)
-{
-	mod_zone_state(zone, item, 1, 1);
-}
-
 void inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
 	mod_zone_state(page_zone(page), item, 1, 1);
@@ -526,15 +521,6 @@ void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
 }
 EXPORT_SYMBOL(mod_zone_page_state);
 
-void inc_zone_state(struct zone *zone, enum zone_stat_item item)
-{
-	unsigned long flags;
-
-	local_irq_save(flags);
-	__inc_zone_state(zone, item);
-	local_irq_restore(flags);
-}
-
 void inc_zone_page_state(struct page *page, enum zone_stat_item item)
 {
 	unsigned long flags;
@@ -979,9 +965,6 @@ const char * const vmstat_text[] = {
 	"numa_local",
 	"numa_other",
 #endif
-	"workingset_refault",
-	"workingset_activate",
-	"workingset_nodereclaim",
 	"nr_anon_transparent_hugepages",
 	"nr_free_cma",
 
@@ -994,6 +977,9 @@ const char * const vmstat_text[] = {
 	"nr_isolated_anon",
 	"nr_isolated_file",
 	"nr_pages_scanned",
+	"workingset_refault",
+	"workingset_activate",
+	"workingset_nodereclaim",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
diff --git a/mm/workingset.c b/mm/workingset.c
index d06d69670b5d..48596c7a910e 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -16,7 +16,7 @@
 /*
  *		Double CLOCK lists
  *
- * Per zone, two clock lists are maintained for file pages: the
+ * Per node, two clock lists are maintained for file pages: the
  * inactive and the active list.  Freshly faulted pages start out at
  * the head of the inactive list and page reclaim scans pages from the
  * tail.  Pages that are accessed multiple times on the inactive list
@@ -141,11 +141,11 @@
  *
  *		Implementation
  *
- * For each zone's file LRU lists, a counter for inactive evictions
- * and activations is maintained (zone->inactive_age).
+ * For each node's file LRU lists, a counter for inactive evictions
+ * and activations is maintained (node->inactive_age).
  *
  * On eviction, a snapshot of this counter (along with some bits to
- * identify the zone) is stored in the now empty page cache radix tree
+ * identify the node) is stored in the now empty page cache radix tree
  * slot of the evicted page.  This is called a shadow entry.
  *
  * On cache misses for which there are shadow entries, an eligible
@@ -153,7 +153,7 @@
  */
 
 #define EVICTION_SHIFT	(RADIX_TREE_EXCEPTIONAL_ENTRY + \
-			 ZONES_SHIFT + NODES_SHIFT +	\
+			 NODES_SHIFT +	\
 			 MEM_CGROUP_ID_SHIFT)
 #define EVICTION_MASK	(~0UL >> EVICTION_SHIFT)
 
@@ -167,33 +167,30 @@
  */
 static unsigned int bucket_order __read_mostly;
 
-static void *pack_shadow(int memcgid, struct zone *zone, unsigned long eviction)
+static void *pack_shadow(int memcgid, pg_data_t *pgdat, unsigned long eviction)
 {
 	eviction >>= bucket_order;
 	eviction = (eviction << MEM_CGROUP_ID_SHIFT) | memcgid;
-	eviction = (eviction << NODES_SHIFT) | zone_to_nid(zone);
-	eviction = (eviction << ZONES_SHIFT) | zone_idx(zone);
+	eviction = (eviction << NODES_SHIFT) | pgdat->node_id;
 	eviction = (eviction << RADIX_TREE_EXCEPTIONAL_SHIFT);
 
 	return (void *)(eviction | RADIX_TREE_EXCEPTIONAL_ENTRY);
 }
 
-static void unpack_shadow(void *shadow, int *memcgidp, struct zone **zonep,
+static void unpack_shadow(void *shadow, int *memcgidp, pg_data_t **pgdat,
 			  unsigned long *evictionp)
 {
 	unsigned long entry = (unsigned long)shadow;
-	int memcgid, nid, zid;
+	int memcgid, nid;
 
 	entry >>= RADIX_TREE_EXCEPTIONAL_SHIFT;
-	zid = entry & ((1UL << ZONES_SHIFT) - 1);
-	entry >>= ZONES_SHIFT;
 	nid = entry & ((1UL << NODES_SHIFT) - 1);
 	entry >>= NODES_SHIFT;
 	memcgid = entry & ((1UL << MEM_CGROUP_ID_SHIFT) - 1);
 	entry >>= MEM_CGROUP_ID_SHIFT;
 
 	*memcgidp = memcgid;
-	*zonep = NODE_DATA(nid)->node_zones + zid;
+	*pgdat = NODE_DATA(nid);
 	*evictionp = entry << bucket_order;
 }
 
@@ -220,7 +217,7 @@ void *workingset_eviction(struct address_space *mapping, struct page *page)
 
 	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, memcg);
 	eviction = atomic_long_inc_return(&lruvec->inactive_age);
-	return pack_shadow(memcgid, zone, eviction);
+	return pack_shadow(memcgid, zone->zone_pgdat, eviction);
 }
 
 /**
@@ -228,7 +225,7 @@ void *workingset_eviction(struct address_space *mapping, struct page *page)
  * @shadow: shadow entry of the evicted page
  *
  * Calculates and evaluates the refault distance of the previously
- * evicted page in the context of the zone it was allocated in.
+ * evicted page in the context of the node it was allocated in.
  *
  * Returns %true if the page should be activated, %false otherwise.
  */
@@ -240,10 +237,10 @@ bool workingset_refault(void *shadow)
 	unsigned long eviction;
 	struct lruvec *lruvec;
 	unsigned long refault;
-	struct zone *zone;
+	struct pglist_data *pgdat;
 	int memcgid;
 
-	unpack_shadow(shadow, &memcgid, &zone, &eviction);
+	unpack_shadow(shadow, &memcgid, &pgdat, &eviction);
 
 	rcu_read_lock();
 	/*
@@ -267,7 +264,7 @@ bool workingset_refault(void *shadow)
 		rcu_read_unlock();
 		return false;
 	}
-	lruvec = mem_cgroup_lruvec(zone->zone_pgdat, memcg);
+	lruvec = mem_cgroup_lruvec(pgdat, memcg);
 	refault = atomic_long_read(&lruvec->inactive_age);
 	active_file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE);
 	rcu_read_unlock();
@@ -290,10 +287,10 @@ bool workingset_refault(void *shadow)
 	 */
 	refault_distance = (refault - eviction) & EVICTION_MASK;
 
-	inc_zone_state(zone, WORKINGSET_REFAULT);
+	inc_node_state(pgdat, WORKINGSET_REFAULT);
 
 	if (refault_distance <= active_file) {
-		inc_zone_state(zone, WORKINGSET_ACTIVATE);
+		inc_node_state(pgdat, WORKINGSET_ACTIVATE);
 		return true;
 	}
 	return false;
@@ -435,7 +432,7 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
 		}
 	}
 	BUG_ON(node->count);
-	inc_zone_state(page_zone(virt_to_page(node)), WORKINGSET_NODERECLAIM);
+	inc_node_state(page_zone(virt_to_page(node))->zone_pgdat, WORKINGSET_NODERECLAIM);
 	if (!__radix_tree_delete_node(&mapping->page_tree, node))
 		BUG();
 
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms of nodes
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (13 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 14/27] mm, workingset: Make working set detection node-aware Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
                   ` (5 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Historically dirty pages were spread among zones but now that LRUs are
per-node it is more appropriate to consider dirty pages in a node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 include/linux/mmzone.h    | 12 +++----
 include/linux/writeback.h |  2 +-
 mm/page-writeback.c       | 89 ++++++++++++++++++++++++++---------------------
 mm/page_alloc.c           | 26 ++++++--------
 4 files changed, 67 insertions(+), 62 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index ace553a21547..86714d52d3a3 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -362,12 +362,6 @@ struct zone {
 	struct pglist_data	*zone_pgdat;
 	struct per_cpu_pageset __percpu *pageset;
 
-	/*
-	 * This is a per-zone reserve of pages that are not available
-	 * to userspace allocations.
-	 */
-	unsigned long		totalreserve_pages;
-
 #ifndef CONFIG_SPARSEMEM
 	/*
 	 * Flags for a pageblock_nr_pages block. See pageblock-flags.h.
@@ -686,6 +680,12 @@ typedef struct pglist_data {
 	/* Number of pages migrated during the rate limiting time interval */
 	unsigned long numabalancing_migrate_nr_pages;
 #endif
+	/*
+	 * This is a per-node reserve of pages that are not available
+	 * to userspace allocations.
+	 */
+	unsigned long		totalreserve_pages;
+
 	/* Write-intensive fields used from the page allocator */
 	ZONE_PADDING(_pad1_)
 	spinlock_t		lru_lock;
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index d0b5ca5d4e08..44b4422ae57f 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -320,7 +320,7 @@ void laptop_mode_timer_fn(unsigned long data);
 static inline void laptop_sync_completion(void) { }
 #endif
 void throttle_vm_writeout(gfp_t gfp_mask);
-bool zone_dirty_ok(struct zone *zone);
+bool node_dirty_ok(struct pglist_data *pgdat);
 int wb_domain_init(struct wb_domain *dom, gfp_t gfp);
 #ifdef CONFIG_CGROUP_WRITEBACK
 void wb_domain_exit(struct wb_domain *dom);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index b0960ec94bc9..365c74575f83 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -267,26 +267,35 @@ static void wb_min_max_ratio(struct bdi_writeback *wb,
  */
 
 /**
- * zone_dirtyable_memory - number of dirtyable pages in a zone
- * @zone: the zone
+ * node_dirtyable_memory - number of dirtyable pages in a node
+ * @pgdat: the node
  *
- * Returns the zone's number of pages potentially available for dirty
- * page cache.  This is the base value for the per-zone dirty limits.
+ * Returns the node's number of pages potentially available for dirty
+ * page cache.  This is the base value for the per-node dirty limits.
  */
-static unsigned long zone_dirtyable_memory(struct zone *zone)
+static unsigned long node_dirtyable_memory(struct pglist_data *pgdat)
 {
-	unsigned long nr_pages;
+	unsigned long nr_pages = 0;
+	int z;
+
+	for (z = 0; z < MAX_NR_ZONES; z++) {
+		struct zone *zone = pgdat->node_zones + z;
+
+		if (!populated_zone(zone))
+			continue;
+
+		nr_pages += zone_page_state(zone, NR_FREE_PAGES);
+	}
 
-	nr_pages = zone_page_state(zone, NR_FREE_PAGES);
 	/*
 	 * Pages reserved for the kernel should not be considered
 	 * dirtyable, to prevent a situation where reclaim has to
 	 * clean pages in order to balance the zones.
 	 */
-	nr_pages -= min(nr_pages, zone->totalreserve_pages);
+	nr_pages -= min(nr_pages, pgdat->totalreserve_pages);
 
-	nr_pages += node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE);
-	nr_pages += node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
+	nr_pages += node_page_state(pgdat, NR_INACTIVE_FILE);
+	nr_pages += node_page_state(pgdat, NR_ACTIVE_FILE);
 
 	return nr_pages;
 }
@@ -297,22 +306,11 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
 	int node;
 	unsigned long x = 0;
 
-	for_each_node_state(node, N_HIGH_MEMORY) {
-		struct zone *z = &NODE_DATA(node)->node_zones[ZONE_HIGHMEM];
-
-		x += zone_dirtyable_memory(z);
-	}
 	/*
-	 * Unreclaimable memory (kernel memory or anonymous memory
-	 * without swap) can bring down the dirtyable pages below
-	 * the zone's dirty balance reserve and the above calculation
-	 * will underflow.  However we still want to add in nodes
-	 * which are below threshold (negative values) to get a more
-	 * accurate calculation but make sure that the total never
-	 * underflows.
+	 * LRU lists are per-node so there is no fast and accurate means of
+	 * calculating dirtyable memory in the highmem zone.
 	 */
-	if ((long)x < 0)
-		x = 0;
+	x = totalhigh_pages;
 
 	/*
 	 * Make sure that the number of highmem pages is never larger
@@ -438,23 +436,23 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
 }
 
 /**
- * zone_dirty_limit - maximum number of dirty pages allowed in a zone
- * @zone: the zone
+ * node_dirty_limit - maximum number of dirty pages allowed in a node
+ * @pgdat: the node
  *
- * Returns the maximum number of dirty pages allowed in a zone, based
- * on the zone's dirtyable memory.
+ * Returns the maximum number of dirty pages allowed in a node, based
+ * on the node's dirtyable memory.
  */
-static unsigned long zone_dirty_limit(struct zone *zone)
+static unsigned long node_dirty_limit(struct pglist_data *pgdat)
 {
-	unsigned long zone_memory = zone_dirtyable_memory(zone);
+	unsigned long node_memory = node_dirtyable_memory(pgdat);
 	struct task_struct *tsk = current;
 	unsigned long dirty;
 
 	if (vm_dirty_bytes)
 		dirty = DIV_ROUND_UP(vm_dirty_bytes, PAGE_SIZE) *
-			zone_memory / global_dirtyable_memory();
+			node_memory / global_dirtyable_memory();
 	else
-		dirty = vm_dirty_ratio * zone_memory / 100;
+		dirty = vm_dirty_ratio * node_memory / 100;
 
 	if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk))
 		dirty += dirty / 4;
@@ -463,19 +461,30 @@ static unsigned long zone_dirty_limit(struct zone *zone)
 }
 
 /**
- * zone_dirty_ok - tells whether a zone is within its dirty limits
- * @zone: the zone to check
+ * node_dirty_ok - tells whether a node is within its dirty limits
+ * @pgdat: the node to check
  *
- * Returns %true when the dirty pages in @zone are within the zone's
+ * Returns %true when the dirty pages in @pgdat are within the node's
  * dirty limit, %false if the limit is exceeded.
  */
-bool zone_dirty_ok(struct zone *zone)
+bool node_dirty_ok(struct pglist_data *pgdat)
 {
-	unsigned long limit = zone_dirty_limit(zone);
+	int z;
+	unsigned long limit = node_dirty_limit(pgdat);
+	unsigned long nr_pages = 0;
+
+	for (z = 0; z < MAX_NR_ZONES; z++) {
+		struct zone *zone = pgdat->node_zones + z;
+
+		if (!populated_zone(zone))
+			continue;
+
+		nr_pages += zone_page_state(zone, NR_FILE_DIRTY);
+		nr_pages += zone_page_state(zone, NR_UNSTABLE_NFS);
+		nr_pages += zone_page_state(zone, NR_WRITEBACK);
+	}
 
-	return zone_page_state(zone, NR_FILE_DIRTY) +
-	       zone_page_state(zone, NR_UNSTABLE_NFS) +
-	       zone_page_state(zone, NR_WRITEBACK) <= limit;
+	return nr_pages <= limit;
 }
 
 int dirty_background_ratio_handler(struct ctl_table *table, int write,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 35d10dabc304..b30a77fb0697 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2668,31 +2668,24 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
 		}
 		/*
 		 * When allocating a page cache page for writing, we
-		 * want to get it from a zone that is within its dirty
-		 * limit, such that no single zone holds more than its
+		 * want to get it from a node that is within its dirty
+		 * limit, such that no single node holds more than its
 		 * proportional share of globally allowed dirty pages.
-		 * The dirty limits take into account the zone's
+		 * The dirty limits take into account the node's
 		 * lowmem reserves and high watermark so that kswapd
 		 * should be able to balance it without having to
 		 * write pages from its LRU list.
 		 *
-		 * This may look like it could increase pressure on
-		 * lower zones by failing allocations in higher zones
-		 * before they are full.  But the pages that do spill
-		 * over are limited as the lower zones are protected
-		 * by this very same mechanism.  It should not become
-		 * a practical burden to them.
-		 *
 		 * XXX: For now, allow allocations to potentially
-		 * exceed the per-zone dirty limit in the slowpath
+		 * exceed the per-node dirty limit in the slowpath
 		 * (spread_dirty_pages unset) before going into reclaim,
 		 * which is important when on a NUMA setup the allowed
-		 * zones are together not big enough to reach the
+		 * nodes are together not big enough to reach the
 		 * global limit.  The proper fix for these situations
-		 * will require awareness of zones in the
+		 * will require awareness of nodes in the
 		 * dirty-throttling and the flusher threads.
 		 */
-		if (ac->spread_dirty_pages && !zone_dirty_ok(zone))
+		if (ac->spread_dirty_pages && !node_dirty_ok(zone->zone_pgdat))
 			continue;
 
 		mark = zone->watermark[alloc_flags & ALLOC_WMARK_MASK];
@@ -6264,6 +6257,9 @@ static void calculate_totalreserve_pages(void)
 	enum zone_type i, j;
 
 	for_each_online_pgdat(pgdat) {
+
+		pgdat->totalreserve_pages = 0;
+
 		for (i = 0; i < MAX_NR_ZONES; i++) {
 			struct zone *zone = pgdat->node_zones + i;
 			long max = 0;
@@ -6280,7 +6276,7 @@ static void calculate_totalreserve_pages(void)
 			if (max > zone->managed_pages)
 				max = zone->managed_pages;
 
-			zone->totalreserve_pages = max;
+			pgdat->totalreserve_pages += max;
 
 			reserve_pages += max;
 		}
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (14 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman
                   ` (4 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Reclaim makes decisions based on the number of file pages that are mapped but
it's mixing node and zone information. Account NR_FILE_MAPPED pages on the node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 arch/tile/mm/pgtable.c |  2 +-
 drivers/base/node.c    |  4 ++--
 fs/proc/meminfo.c      |  4 ++--
 include/linux/mmzone.h |  6 +++---
 mm/page_alloc.c        |  6 +++---
 mm/rmap.c              | 13 +++++++------
 mm/vmscan.c            |  2 +-
 mm/vmstat.c            |  4 ++--
 8 files changed, 21 insertions(+), 20 deletions(-)

diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 3ed0a666d44a..2e784e84bd6f 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -55,7 +55,7 @@ void show_mem(unsigned int filter)
 	       global_page_state(NR_FREE_PAGES),
 	       (global_page_state(NR_SLAB_RECLAIMABLE) +
 		global_page_state(NR_SLAB_UNRECLAIMABLE)),
-	       global_page_state(NR_FILE_MAPPED),
+	       global_node_page_state(NR_FILE_MAPPED),
 	       global_page_state(NR_PAGETABLE),
 	       global_page_state(NR_BOUNCE),
 	       global_page_state(NR_FILE_PAGES),
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 4260c7f3ee1b..66aed68a0fdc 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -119,8 +119,8 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
 		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
-		       nid, K(sum_zone_node_page_state(nid, NR_FILE_MAPPED)),
-		       nid, K(sum_zone_node_page_state(nid, NR_ANON_PAGES)),
+		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
+		       nid, K(node_page_state(pgdat, NR_ANON_PAGES)),
 		       nid, K(i.sharedram),
 		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 83720460c5bc..54e039682ec9 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -138,8 +138,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		K(i.freeswap),
 		K(global_page_state(NR_FILE_DIRTY)),
 		K(global_page_state(NR_WRITEBACK)),
-		K(global_page_state(NR_ANON_PAGES)),
-		K(global_page_state(NR_FILE_MAPPED)),
+		K(global_node_page_state(NR_ANON_PAGES)),
+		K(global_node_page_state(NR_FILE_MAPPED)),
 		K(i.sharedram),
 		K(global_page_state(NR_SLAB_RECLAIMABLE) +
 				global_page_state(NR_SLAB_UNRECLAIMABLE)),
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 86714d52d3a3..e7d105259aa6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -119,9 +119,6 @@ enum zone_stat_item {
 	NR_FREE_PAGES,
 	NR_ALLOC_BATCH,
 	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
-	NR_ANON_PAGES,	/* Mapped anonymous pages */
-	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
-			   only modified from process context */
 	NR_FILE_PAGES,
 	NR_FILE_DIRTY,
 	NR_WRITEBACK,
@@ -163,6 +160,9 @@ enum node_stat_item {
 	WORKINGSET_REFAULT,
 	WORKINGSET_ACTIVATE,
 	WORKINGSET_NODERECLAIM,
+	NR_ANON_PAGES,	/* Mapped anonymous pages */
+	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
+			   only modified from process context */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b30a77fb0697..36119b734e3c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3893,7 +3893,7 @@ void show_free_areas(unsigned int filter)
 		global_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_SLAB_RECLAIMABLE),
 		global_page_state(NR_SLAB_UNRECLAIMABLE),
-		global_page_state(NR_FILE_MAPPED),
+		global_node_page_state(NR_FILE_MAPPED),
 		global_page_state(NR_SHMEM),
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE),
@@ -3910,6 +3910,7 @@ void show_free_areas(unsigned int filter)
 			" unevictable:%lukB"
 			" isolated(anon):%lukB"
 			" isolated(file):%lukB"
+			" mapped:%lukB"
 			" all_unreclaimable? %s"
 			"\n",
 			pgdat->node_id,
@@ -3920,6 +3921,7 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_UNEVICTABLE)),
 			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
 			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
+			K(node_page_state(pgdat, NR_FILE_MAPPED)),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
@@ -3944,7 +3946,6 @@ void show_free_areas(unsigned int filter)
 			" mlocked:%lukB"
 			" dirty:%lukB"
 			" writeback:%lukB"
-			" mapped:%lukB"
 			" shmem:%lukB"
 			" slab_reclaimable:%lukB"
 			" slab_unreclaimable:%lukB"
@@ -3968,7 +3969,6 @@ void show_free_areas(unsigned int filter)
 			K(zone_page_state(zone, NR_MLOCK)),
 			K(zone_page_state(zone, NR_FILE_DIRTY)),
 			K(zone_page_state(zone, NR_WRITEBACK)),
-			K(zone_page_state(zone, NR_FILE_MAPPED)),
 			K(zone_page_state(zone, NR_SHMEM)),
 			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
 			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
diff --git a/mm/rmap.c b/mm/rmap.c
index 5b3c19f633c2..0788298025e5 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1231,7 +1231,8 @@ void do_page_add_anon_rmap(struct page *page,
 			__inc_zone_page_state(page,
 					      NR_ANON_TRANSPARENT_HUGEPAGES);
 		}
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat,
+				NR_ANON_PAGES, nr);
 	}
 	if (unlikely(PageKsm(page)))
 		return;
@@ -1275,7 +1276,7 @@ void page_add_new_anon_rmap(struct page *page,
 		/* increment count (starts at -1) */
 		atomic_set(&page->_mapcount, 0);
 	}
-	__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, nr);
 	__page_set_anon_rmap(page, vma, address, 1);
 }
 
@@ -1289,7 +1290,7 @@ void page_add_file_rmap(struct page *page)
 {
 	lock_page_memcg(page);
 	if (atomic_inc_and_test(&page->_mapcount)) {
-		__inc_zone_page_state(page, NR_FILE_MAPPED);
+		__inc_node_page_state(page, NR_FILE_MAPPED);
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 	}
 	unlock_page_memcg(page);
@@ -1315,7 +1316,7 @@ static void page_remove_file_rmap(struct page *page)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_FILE_MAPPED);
+	__dec_node_page_state(page, NR_FILE_MAPPED);
 	mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 
 	if (unlikely(PageMlocked(page)))
@@ -1357,7 +1358,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
 		clear_page_mlock(page);
 
 	if (nr) {
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, -nr);
 		deferred_split_huge_page(page);
 	}
 }
@@ -1389,7 +1390,7 @@ void page_remove_rmap(struct page *page, bool compound)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_ANON_PAGES);
+	__dec_node_page_state(page, NR_ANON_PAGES);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 09e557c95731..b13deefc671b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3593,7 +3593,7 @@ int sysctl_min_slab_ratio = 5;
 
 static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
 {
-	unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
+	unsigned long file_mapped = node_page_state(zone->zone_pgdat, NR_FILE_MAPPED);
 	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
 		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
 
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 80a75f8ede5b..4fd6d3f8764d 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -939,8 +939,6 @@ const char * const vmstat_text[] = {
 	"nr_free_pages",
 	"nr_alloc_batch",
 	"nr_mlock",
-	"nr_anon_pages",
-	"nr_mapped",
 	"nr_file_pages",
 	"nr_dirty",
 	"nr_writeback",
@@ -980,6 +978,8 @@ const char * const vmstat_text[] = {
 	"workingset_refault",
 	"workingset_activate",
 	"workingset_nodereclaim",
+	"nr_anon_pages",
+	"nr_mapped",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (15 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 18/27] mm: Move most file-based accounting to the node Mel Gorman
                   ` (3 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

NR_FILE_PAGES  is the number of        file pages.
NR_FILE_MAPPED is the number of mapped file pages.
NR_ANON_PAGES  is the number of mapped anon pages.

This is unhelpful naming as it's easy to confuse NR_FILE_MAPPED and NR_ANON_PAGES for
mapped pages. This patch renames NR_ANON_PAGES so we have

NR_FILE_PAGES  is the number of        file pages.
NR_FILE_MAPPED is the number of mapped file pages.
NR_ANON_MAPPED is the number of mapped anon pages.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 drivers/base/node.c    | 2 +-
 fs/proc/meminfo.c      | 2 +-
 include/linux/mmzone.h | 2 +-
 mm/migrate.c           | 2 +-
 mm/rmap.c              | 8 ++++----
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 66aed68a0fdc..897b6bcb36be 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -120,7 +120,7 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
 		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
-		       nid, K(node_page_state(pgdat, NR_ANON_PAGES)),
+		       nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
 		       nid, K(i.sharedram),
 		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 54e039682ec9..076afb43fc56 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -138,7 +138,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		K(i.freeswap),
 		K(global_page_state(NR_FILE_DIRTY)),
 		K(global_page_state(NR_WRITEBACK)),
-		K(global_node_page_state(NR_ANON_PAGES)),
+		K(global_node_page_state(NR_ANON_MAPPED)),
 		K(global_node_page_state(NR_FILE_MAPPED)),
 		K(i.sharedram),
 		K(global_page_state(NR_SLAB_RECLAIMABLE) +
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index e7d105259aa6..181dc960fccb 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -160,7 +160,7 @@ enum node_stat_item {
 	WORKINGSET_REFAULT,
 	WORKINGSET_ACTIVATE,
 	WORKINGSET_NODERECLAIM,
-	NR_ANON_PAGES,	/* Mapped anonymous pages */
+	NR_ANON_MAPPED,	/* Mapped anonymous pages */
 	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
 			   only modified from process context */
 	NR_VM_NODE_STAT_ITEMS
diff --git a/mm/migrate.c b/mm/migrate.c
index 53bb33c570bf..507277571847 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -412,7 +412,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	 * new page and drop references to the old page.
 	 *
 	 * Note that anonymous pages are accounted for
-	 * via NR_FILE_PAGES and NR_ANON_PAGES if they
+	 * via NR_FILE_PAGES and NR_ANON_MAPPED if they
 	 * are mapped to swap space.
 	 */
 	if (newzone != oldzone) {
diff --git a/mm/rmap.c b/mm/rmap.c
index 0788298025e5..16e57be11e95 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1232,7 +1232,7 @@ void do_page_add_anon_rmap(struct page *page,
 					      NR_ANON_TRANSPARENT_HUGEPAGES);
 		}
 		__mod_node_page_state(page_zone(page)->zone_pgdat,
-				NR_ANON_PAGES, nr);
+				NR_ANON_MAPPED, nr);
 	}
 	if (unlikely(PageKsm(page)))
 		return;
@@ -1276,7 +1276,7 @@ void page_add_new_anon_rmap(struct page *page,
 		/* increment count (starts at -1) */
 		atomic_set(&page->_mapcount, 0);
 	}
-	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, nr);
+	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_MAPPED, nr);
 	__page_set_anon_rmap(page, vma, address, 1);
 }
 
@@ -1358,7 +1358,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
 		clear_page_mlock(page);
 
 	if (nr) {
-		__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, -nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_MAPPED, -nr);
 		deferred_split_huge_page(page);
 	}
 }
@@ -1390,7 +1390,7 @@ void page_remove_rmap(struct page *page, bool compound)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_node_page_state(page, NR_ANON_PAGES);
+	__dec_node_page_state(page, NR_ANON_MAPPED);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 18/27] mm: Move most file-based accounting to the node
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (16 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 19/27] mm: Move vmscan writes and file write " Mel Gorman
                   ` (2 subsequent siblings)
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

There are now a number of accounting oddities such as mapped file pages
being accounted for on the node while the total number of file pages are
accounted on the zone. This can be coped with to some extent but it's
confusing so this patch moves the relevant file-based accounted.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 arch/s390/appldata/appldata_mem.c         |  2 +-
 arch/tile/mm/pgtable.c                    |  8 +++---
 drivers/base/node.c                       | 10 ++++----
 drivers/staging/android/lowmemorykiller.c |  4 +--
 fs/fs-writeback.c                         |  4 +--
 fs/fuse/file.c                            |  8 +++---
 fs/nfs/internal.h                         |  2 +-
 fs/nfs/write.c                            |  2 +-
 fs/proc/meminfo.c                         | 10 ++++----
 include/linux/mmzone.h                    | 12 ++++-----
 include/trace/events/writeback.h          |  6 ++---
 mm/filemap.c                              | 10 ++++----
 mm/migrate.c                              | 12 ++++-----
 mm/page-writeback.c                       | 42 +++++++++++++------------------
 mm/page_alloc.c                           | 34 ++++++++++++-------------
 mm/shmem.c                                | 12 ++++-----
 mm/swap_state.c                           |  4 +--
 mm/util.c                                 |  4 +--
 mm/vmscan.c                               | 16 ++++++------
 mm/vmstat.c                               | 12 ++++-----
 20 files changed, 103 insertions(+), 111 deletions(-)

diff --git a/arch/s390/appldata/appldata_mem.c b/arch/s390/appldata/appldata_mem.c
index edcf2a706942..598df5708501 100644
--- a/arch/s390/appldata/appldata_mem.c
+++ b/arch/s390/appldata/appldata_mem.c
@@ -102,7 +102,7 @@ static void appldata_get_mem_data(void *data)
 	mem_data->totalhigh = P2K(val.totalhigh);
 	mem_data->freehigh  = P2K(val.freehigh);
 	mem_data->bufferram = P2K(val.bufferram);
-	mem_data->cached    = P2K(global_page_state(NR_FILE_PAGES)
+	mem_data->cached    = P2K(global_node_page_state(NR_FILE_PAGES)
 				- val.bufferram);
 
 	si_swapinfo(&val);
diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 2e784e84bd6f..dad42acd0f84 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -49,16 +49,16 @@ void show_mem(unsigned int filter)
 		global_node_page_state(NR_ACTIVE_FILE)),
 	       (global_node_page_state(NR_INACTIVE_ANON) +
 		global_node_page_state(NR_INACTIVE_FILE)),
-	       global_page_state(NR_FILE_DIRTY),
-	       global_page_state(NR_WRITEBACK),
-	       global_page_state(NR_UNSTABLE_NFS),
+	       global_node_page_state(NR_FILE_DIRTY),
+	       global_node_page_state(NR_WRITEBACK),
+	       global_node_page_state(NR_UNSTABLE_NFS),
 	       global_page_state(NR_FREE_PAGES),
 	       (global_page_state(NR_SLAB_RECLAIMABLE) +
 		global_page_state(NR_SLAB_UNRECLAIMABLE)),
 	       global_node_page_state(NR_FILE_MAPPED),
 	       global_page_state(NR_PAGETABLE),
 	       global_page_state(NR_BOUNCE),
-	       global_page_state(NR_FILE_PAGES),
+	       global_node_page_state(NR_FILE_PAGES),
 	       get_nr_swap_pages());
 
 	for_each_zone(zone) {
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 897b6bcb36be..ec733919bc6b 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -116,18 +116,18 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       "Node %d AnonHugePages:  %8lu kB\n"
 #endif
 			,
-		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
-		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
-		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
+		       nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
+		       nid, K(node_page_state(pgdat, NR_WRITEBACK)),
+		       nid, K(node_page_state(pgdat, NR_FILE_PAGES)),
 		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
 		       nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
 		       nid, K(i.sharedram),
 		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
 		       nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
-		       nid, K(sum_zone_node_page_state(nid, NR_UNSTABLE_NFS)),
+		       nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
 		       nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),
-		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK_TEMP)),
+		       nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
 		       nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE) +
 				sum_zone_node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
 		       nid, K(sum_zone_node_page_state(nid, NR_SLAB_RECLAIMABLE)),
diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
index ad2f97ccb0d3..9ca5667a38f0 100644
--- a/drivers/staging/android/lowmemorykiller.c
+++ b/drivers/staging/android/lowmemorykiller.c
@@ -91,8 +91,8 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
 	short selected_oom_score_adj;
 	int array_size = ARRAY_SIZE(lowmem_adj);
 	int other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
-	int other_file = global_page_state(NR_FILE_PAGES) -
-						global_page_state(NR_SHMEM) -
+	int other_file = global_node_page_state(NR_FILE_PAGES) -
+						global_node_page_state(NR_SHMEM) -
 						total_swapcache_pages();
 
 	if (lowmem_adj_size < array_size)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index fee81e8768c9..43e32972a475 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1770,8 +1770,8 @@ static struct wb_writeback_work *get_next_work_item(struct bdi_writeback *wb)
  */
 static unsigned long get_nr_dirty_pages(void)
 {
-	return global_page_state(NR_FILE_DIRTY) +
-		global_page_state(NR_UNSTABLE_NFS) +
+	return global_node_page_state(NR_FILE_DIRTY) +
+		global_node_page_state(NR_UNSTABLE_NFS) +
 		get_nr_dirty_inodes();
 }
 
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9dde38f12c07..5f1c9c84712c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1452,7 +1452,7 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
 	list_del(&req->writepages_entry);
 	for (i = 0; i < req->num_pages; i++) {
 		dec_wb_stat(&bdi->wb, WB_WRITEBACK);
-		dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP);
+		dec_node_page_state(req->pages[i], NR_WRITEBACK_TEMP);
 		wb_writeout_inc(&bdi->wb);
 	}
 	wake_up(&fi->page_waitq);
@@ -1642,7 +1642,7 @@ static int fuse_writepage_locked(struct page *page)
 	req->inode = inode;
 
 	inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
-	inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
+	inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP);
 
 	spin_lock(&fc->lock);
 	list_add(&req->writepages_entry, &fi->writepages);
@@ -1756,7 +1756,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
 		spin_unlock(&fc->lock);
 
 		dec_wb_stat(&bdi->wb, WB_WRITEBACK);
-		dec_zone_page_state(page, NR_WRITEBACK_TEMP);
+		dec_node_page_state(page, NR_WRITEBACK_TEMP);
 		wb_writeout_inc(&bdi->wb);
 		fuse_writepage_free(fc, new_req);
 		fuse_request_free(new_req);
@@ -1855,7 +1855,7 @@ static int fuse_writepages_fill(struct page *page,
 	req->page_descs[req->num_pages].length = PAGE_SIZE;
 
 	inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
-	inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP);
+	inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP);
 
 	err = 0;
 	if (is_writeback && fuse_writepage_in_flight(req, page)) {
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 565f8135ae1f..6292d9e3446a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -622,7 +622,7 @@ void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 	if (!cinfo->dreq) {
 		struct inode *inode = page_file_mapping(page)->host;
 
-		inc_zone_page_state(page, NR_UNSTABLE_NFS);
+		inc_node_page_state(page, NR_UNSTABLE_NFS);
 		inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
 		__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 	}
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 5754835a2886..d1e8d70f644b 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -897,7 +897,7 @@ nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 static void
 nfs_clear_page_commit(struct page *page)
 {
-	dec_zone_page_state(page, NR_UNSTABLE_NFS);
+	dec_node_page_state(page, NR_UNSTABLE_NFS);
 	dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
 		    WB_RECLAIMABLE);
 }
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 076afb43fc56..6cb9ea36d0fc 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -40,7 +40,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 	si_swapinfo(&i);
 	committed = percpu_counter_read_positive(&vm_committed_as);
 
-	cached = global_page_state(NR_FILE_PAGES) -
+	cached = global_node_page_state(NR_FILE_PAGES) -
 			total_swapcache_pages() - i.bufferram;
 	if (cached < 0)
 		cached = 0;
@@ -136,8 +136,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 #endif
 		K(i.totalswap),
 		K(i.freeswap),
-		K(global_page_state(NR_FILE_DIRTY)),
-		K(global_page_state(NR_WRITEBACK)),
+		K(global_node_page_state(NR_FILE_DIRTY)),
+		K(global_node_page_state(NR_WRITEBACK)),
 		K(global_node_page_state(NR_ANON_MAPPED)),
 		K(global_node_page_state(NR_FILE_MAPPED)),
 		K(i.sharedram),
@@ -150,9 +150,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 #ifdef CONFIG_QUICKLIST
 		K(quicklist_total_size()),
 #endif
-		K(global_page_state(NR_UNSTABLE_NFS)),
+		K(global_node_page_state(NR_UNSTABLE_NFS)),
 		K(global_page_state(NR_BOUNCE)),
-		K(global_page_state(NR_WRITEBACK_TEMP)),
+		K(global_node_page_state(NR_WRITEBACK_TEMP)),
 		K(vm_commit_limit()),
 		K(committed),
 		(unsigned long)VMALLOC_TOTAL >> 10,
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 181dc960fccb..b4f91e9278c5 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -119,20 +119,14 @@ enum zone_stat_item {
 	NR_FREE_PAGES,
 	NR_ALLOC_BATCH,
 	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
-	NR_FILE_PAGES,
-	NR_FILE_DIRTY,
-	NR_WRITEBACK,
 	NR_SLAB_RECLAIMABLE,
 	NR_SLAB_UNRECLAIMABLE,
 	NR_PAGETABLE,		/* used for pagetables */
 	NR_KERNEL_STACK,
 	/* Second 128 byte cacheline */
-	NR_UNSTABLE_NFS,	/* NFS unstable pages */
 	NR_BOUNCE,
 	NR_VMSCAN_WRITE,
 	NR_VMSCAN_IMMEDIATE,	/* Prioritise for reclaim when writeback ends */
-	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
-	NR_SHMEM,		/* shmem pages (included tmpfs/GEM pages) */
 	NR_DIRTIED,		/* page dirtyings since bootup */
 	NR_WRITTEN,		/* page writings since bootup */
 #ifdef CONFIG_NUMA
@@ -163,6 +157,12 @@ enum node_stat_item {
 	NR_ANON_MAPPED,	/* Mapped anonymous pages */
 	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
 			   only modified from process context */
+	NR_FILE_PAGES,
+	NR_FILE_DIRTY,
+	NR_WRITEBACK,
+	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
+	NR_SHMEM,		/* shmem pages (included tmpfs/GEM pages) */
+	NR_UNSTABLE_NFS,	/* NFS unstable pages */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 73614ce1d204..c581d9c04ca5 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -412,9 +412,9 @@ TRACE_EVENT(global_dirty_state,
 	),
 
 	TP_fast_assign(
-		__entry->nr_dirty	= global_page_state(NR_FILE_DIRTY);
-		__entry->nr_writeback	= global_page_state(NR_WRITEBACK);
-		__entry->nr_unstable	= global_page_state(NR_UNSTABLE_NFS);
+		__entry->nr_dirty	= global_node_page_state(NR_FILE_DIRTY);
+		__entry->nr_writeback	= global_node_page_state(NR_WRITEBACK);
+		__entry->nr_unstable	= global_node_page_state(NR_UNSTABLE_NFS);
 		__entry->nr_dirtied	= global_page_state(NR_DIRTIED);
 		__entry->nr_written	= global_page_state(NR_WRITTEN);
 		__entry->background_thresh = background_thresh;
diff --git a/mm/filemap.c b/mm/filemap.c
index 99c62afbb71b..0dfd0b93acd1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -224,9 +224,9 @@ void __delete_from_page_cache(struct page *page, void *shadow)
 
 	/* hugetlb pages do not participate in page cache accounting. */
 	if (!PageHuge(page))
-		__dec_zone_page_state(page, NR_FILE_PAGES);
+		__dec_node_page_state(page, NR_FILE_PAGES);
 	if (PageSwapBacked(page))
-		__dec_zone_page_state(page, NR_SHMEM);
+		__dec_node_page_state(page, NR_SHMEM);
 
 	/*
 	 * At this point page must be either written or cleaned by truncate.
@@ -564,9 +564,9 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
 		 * hugetlb pages do not participate in page cache accounting.
 		 */
 		if (!PageHuge(new))
-			__inc_zone_page_state(new, NR_FILE_PAGES);
+			__inc_node_page_state(new, NR_FILE_PAGES);
 		if (PageSwapBacked(new))
-			__inc_zone_page_state(new, NR_SHMEM);
+			__inc_node_page_state(new, NR_SHMEM);
 		spin_unlock_irqrestore(&mapping->tree_lock, flags);
 		mem_cgroup_migrate(old, new);
 		radix_tree_preload_end();
@@ -663,7 +663,7 @@ static int __add_to_page_cache_locked(struct page *page,
 
 	/* hugetlb pages do not participate in page cache accounting. */
 	if (!huge)
-		__inc_zone_page_state(page, NR_FILE_PAGES);
+		__inc_node_page_state(page, NR_FILE_PAGES);
 	spin_unlock_irq(&mapping->tree_lock);
 	if (!huge)
 		mem_cgroup_commit_charge(page, memcg, false, false);
diff --git a/mm/migrate.c b/mm/migrate.c
index 507277571847..88be5ce351fa 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -416,15 +416,15 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	 * are mapped to swap space.
 	 */
 	if (newzone != oldzone) {
-		__dec_zone_state(oldzone, NR_FILE_PAGES);
-		__inc_zone_state(newzone, NR_FILE_PAGES);
+		__dec_node_state(oldzone->zone_pgdat, NR_FILE_PAGES);
+		__inc_node_state(newzone->zone_pgdat, NR_FILE_PAGES);
 		if (PageSwapBacked(page) && !PageSwapCache(page)) {
-			__dec_zone_state(oldzone, NR_SHMEM);
-			__inc_zone_state(newzone, NR_SHMEM);
+			__dec_node_state(oldzone->zone_pgdat, NR_SHMEM);
+			__inc_node_state(newzone->zone_pgdat, NR_SHMEM);
 		}
 		if (dirty && mapping_cap_account_dirty(mapping)) {
-			__dec_zone_state(oldzone, NR_FILE_DIRTY);
-			__inc_zone_state(newzone, NR_FILE_DIRTY);
+			__dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY);
+			__inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY);
 		}
 	}
 	local_irq_enable();
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 365c74575f83..1e8c91281cc8 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -469,20 +469,12 @@ static unsigned long node_dirty_limit(struct pglist_data *pgdat)
  */
 bool node_dirty_ok(struct pglist_data *pgdat)
 {
-	int z;
 	unsigned long limit = node_dirty_limit(pgdat);
 	unsigned long nr_pages = 0;
 
-	for (z = 0; z < MAX_NR_ZONES; z++) {
-		struct zone *zone = pgdat->node_zones + z;
-
-		if (!populated_zone(zone))
-			continue;
-
-		nr_pages += zone_page_state(zone, NR_FILE_DIRTY);
-		nr_pages += zone_page_state(zone, NR_UNSTABLE_NFS);
-		nr_pages += zone_page_state(zone, NR_WRITEBACK);
-	}
+	nr_pages += node_page_state(pgdat, NR_FILE_DIRTY);
+	nr_pages += node_page_state(pgdat, NR_UNSTABLE_NFS);
+	nr_pages += node_page_state(pgdat, NR_WRITEBACK);
 
 	return nr_pages <= limit;
 }
@@ -1572,10 +1564,10 @@ static void balance_dirty_pages(struct address_space *mapping,
 		 * written to the server's write cache, but has not yet
 		 * been flushed to permanent storage.
 		 */
-		nr_reclaimable = global_page_state(NR_FILE_DIRTY) +
-					global_page_state(NR_UNSTABLE_NFS);
+		nr_reclaimable = global_node_page_state(NR_FILE_DIRTY) +
+					global_node_page_state(NR_UNSTABLE_NFS);
 		gdtc->avail = global_dirtyable_memory();
-		gdtc->dirty = nr_reclaimable + global_page_state(NR_WRITEBACK);
+		gdtc->dirty = nr_reclaimable + global_node_page_state(NR_WRITEBACK);
 
 		domain_dirty_limits(gdtc);
 
@@ -1912,8 +1904,8 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb)
 	 * as we're trying to decide whether to put more under writeback.
 	 */
 	gdtc->avail = global_dirtyable_memory();
-	gdtc->dirty = global_page_state(NR_FILE_DIRTY) +
-		      global_page_state(NR_UNSTABLE_NFS);
+	gdtc->dirty = global_node_page_state(NR_FILE_DIRTY) +
+		      global_node_page_state(NR_UNSTABLE_NFS);
 	domain_dirty_limits(gdtc);
 
 	if (gdtc->dirty > gdtc->bg_thresh)
@@ -1955,8 +1947,8 @@ void throttle_vm_writeout(gfp_t gfp_mask)
                  */
                 dirty_thresh += dirty_thresh / 10;      /* wheeee... */
 
-                if (global_page_state(NR_UNSTABLE_NFS) +
-			global_page_state(NR_WRITEBACK) <= dirty_thresh)
+                if (global_node_page_state(NR_UNSTABLE_NFS) +
+			global_node_page_state(NR_WRITEBACK) <= dirty_thresh)
                         	break;
                 congestion_wait(BLK_RW_ASYNC, HZ/10);
 
@@ -1984,8 +1976,8 @@ int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
 void laptop_mode_timer_fn(unsigned long data)
 {
 	struct request_queue *q = (struct request_queue *)data;
-	int nr_pages = global_page_state(NR_FILE_DIRTY) +
-		global_page_state(NR_UNSTABLE_NFS);
+	int nr_pages = global_node_page_state(NR_FILE_DIRTY) +
+		global_node_page_state(NR_UNSTABLE_NFS);
 	struct bdi_writeback *wb;
 
 	/*
@@ -2436,7 +2428,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
 		wb = inode_to_wb(inode);
 
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_DIRTY);
-		__inc_zone_page_state(page, NR_FILE_DIRTY);
+		__inc_node_page_state(page, NR_FILE_DIRTY);
 		__inc_zone_page_state(page, NR_DIRTIED);
 		__inc_wb_stat(wb, WB_RECLAIMABLE);
 		__inc_wb_stat(wb, WB_DIRTIED);
@@ -2457,7 +2449,7 @@ void account_page_cleaned(struct page *page, struct address_space *mapping,
 {
 	if (mapping_cap_account_dirty(mapping)) {
 		mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_DIRTY);
-		dec_zone_page_state(page, NR_FILE_DIRTY);
+		dec_node_page_state(page, NR_FILE_DIRTY);
 		dec_wb_stat(wb, WB_RECLAIMABLE);
 		task_io_account_cancelled_write(PAGE_CACHE_SIZE);
 	}
@@ -2712,7 +2704,7 @@ int clear_page_dirty_for_io(struct page *page)
 		wb = unlocked_inode_to_wb_begin(inode, &locked);
 		if (TestClearPageDirty(page)) {
 			mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_DIRTY);
-			dec_zone_page_state(page, NR_FILE_DIRTY);
+			dec_node_page_state(page, NR_FILE_DIRTY);
 			dec_wb_stat(wb, WB_RECLAIMABLE);
 			ret = 1;
 		}
@@ -2753,7 +2745,7 @@ int test_clear_page_writeback(struct page *page)
 	}
 	if (ret) {
 		mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
-		dec_zone_page_state(page, NR_WRITEBACK);
+		dec_node_page_state(page, NR_WRITEBACK);
 		inc_zone_page_state(page, NR_WRITTEN);
 	}
 	unlock_page_memcg(page);
@@ -2794,7 +2786,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
 	}
 	if (!ret) {
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
-		inc_zone_page_state(page, NR_WRITEBACK);
+		inc_node_page_state(page, NR_WRITEBACK);
 	}
 	unlock_page_memcg(page);
 	return ret;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 36119b734e3c..e8e518af7a97 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3768,7 +3768,7 @@ EXPORT_SYMBOL_GPL(si_mem_available);
 void si_meminfo(struct sysinfo *val)
 {
 	val->totalram = totalram_pages;
-	val->sharedram = global_page_state(NR_SHMEM);
+	val->sharedram = global_node_page_state(NR_SHMEM);
 	val->freeram = global_page_state(NR_FREE_PAGES);
 	val->bufferram = nr_blockdev_pages();
 	val->totalhigh = totalhigh_pages;
@@ -3788,7 +3788,7 @@ void si_meminfo_node(struct sysinfo *val, int nid)
 	for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
 		managed_pages += pgdat->node_zones[zone_type].managed_pages;
 	val->totalram = managed_pages;
-	val->sharedram = sum_zone_node_page_state(nid, NR_SHMEM);
+	val->sharedram = node_page_state(pgdat, NR_SHMEM);
 	val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES);
 #ifdef CONFIG_HIGHMEM
 	val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;
@@ -3888,13 +3888,13 @@ void show_free_areas(unsigned int filter)
 		global_node_page_state(NR_INACTIVE_FILE),
 		global_node_page_state(NR_ISOLATED_FILE),
 		global_node_page_state(NR_UNEVICTABLE),
-		global_page_state(NR_FILE_DIRTY),
-		global_page_state(NR_WRITEBACK),
-		global_page_state(NR_UNSTABLE_NFS),
+		global_node_page_state(NR_FILE_DIRTY),
+		global_node_page_state(NR_WRITEBACK),
+		global_node_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_SLAB_RECLAIMABLE),
 		global_page_state(NR_SLAB_UNRECLAIMABLE),
 		global_node_page_state(NR_FILE_MAPPED),
-		global_page_state(NR_SHMEM),
+		global_node_page_state(NR_SHMEM),
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE),
 		global_page_state(NR_FREE_PAGES),
@@ -3911,6 +3911,11 @@ void show_free_areas(unsigned int filter)
 			" isolated(anon):%lukB"
 			" isolated(file):%lukB"
 			" mapped:%lukB"
+			" dirty:%lukB"
+			" writeback:%lukB"
+			" shmem:%lukB"
+			" writeback_tmp:%lukB"
+			" unstable:%lukB"
 			" all_unreclaimable? %s"
 			"\n",
 			pgdat->node_id,
@@ -3922,6 +3927,11 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
 			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
 			K(node_page_state(pgdat, NR_FILE_MAPPED)),
+			K(node_page_state(pgdat, NR_FILE_DIRTY)),
+			K(node_page_state(pgdat, NR_WRITEBACK)),
+			K(node_page_state(pgdat, NR_SHMEM)),
+			K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
+			K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
@@ -3944,19 +3954,14 @@ void show_free_areas(unsigned int filter)
 			" present:%lukB"
 			" managed:%lukB"
 			" mlocked:%lukB"
-			" dirty:%lukB"
-			" writeback:%lukB"
-			" shmem:%lukB"
 			" slab_reclaimable:%lukB"
 			" slab_unreclaimable:%lukB"
 			" kernel_stack:%lukB"
 			" pagetables:%lukB"
-			" unstable:%lukB"
 			" bounce:%lukB"
 			" free_pcp:%lukB"
 			" local_pcp:%ukB"
 			" free_cma:%lukB"
-			" writeback_tmp:%lukB"
 			" node_pages_scanned:%lu"
 			"\n",
 			zone->name,
@@ -3967,20 +3972,15 @@ void show_free_areas(unsigned int filter)
 			K(zone->present_pages),
 			K(zone->managed_pages),
 			K(zone_page_state(zone, NR_MLOCK)),
-			K(zone_page_state(zone, NR_FILE_DIRTY)),
-			K(zone_page_state(zone, NR_WRITEBACK)),
-			K(zone_page_state(zone, NR_SHMEM)),
 			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
 			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
 			zone_page_state(zone, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
 			K(zone_page_state(zone, NR_PAGETABLE)),
-			K(zone_page_state(zone, NR_UNSTABLE_NFS)),
 			K(zone_page_state(zone, NR_BOUNCE)),
 			K(free_pcp),
 			K(this_cpu_read(zone->pageset->pcp.count)),
 			K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
-			K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
 			K(node_page_state(zone->zone_pgdat, NR_PAGES_SCANNED)));
 		printk("lowmem_reserve[]:");
 		for (i = 0; i < MAX_NR_ZONES; i++)
@@ -4023,7 +4023,7 @@ void show_free_areas(unsigned int filter)
 
 	hugetlb_show_meminfo();
 
-	printk("%ld total pagecache pages\n", global_page_state(NR_FILE_PAGES));
+	printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES));
 
 	show_swap_cache_info();
 }
diff --git a/mm/shmem.c b/mm/shmem.c
index 9428c51ab2d6..9fbdb30f24a2 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -312,8 +312,8 @@ static int shmem_add_to_page_cache(struct page *page,
 								 page);
 	if (!error) {
 		mapping->nrpages++;
-		__inc_zone_page_state(page, NR_FILE_PAGES);
-		__inc_zone_page_state(page, NR_SHMEM);
+		__inc_node_page_state(page, NR_FILE_PAGES);
+		__inc_node_page_state(page, NR_SHMEM);
 		spin_unlock_irq(&mapping->tree_lock);
 	} else {
 		page->mapping = NULL;
@@ -335,8 +335,8 @@ static void shmem_delete_from_page_cache(struct page *page, void *radswap)
 	error = shmem_radix_tree_replace(mapping, page->index, page, radswap);
 	page->mapping = NULL;
 	mapping->nrpages--;
-	__dec_zone_page_state(page, NR_FILE_PAGES);
-	__dec_zone_page_state(page, NR_SHMEM);
+	__dec_node_page_state(page, NR_FILE_PAGES);
+	__dec_node_page_state(page, NR_SHMEM);
 	spin_unlock_irq(&mapping->tree_lock);
 	page_cache_release(page);
 	BUG_ON(error);
@@ -1098,8 +1098,8 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp,
 	error = shmem_radix_tree_replace(swap_mapping, swap_index, oldpage,
 								   newpage);
 	if (!error) {
-		__inc_zone_page_state(newpage, NR_FILE_PAGES);
-		__dec_zone_page_state(oldpage, NR_FILE_PAGES);
+		__inc_node_page_state(newpage, NR_FILE_PAGES);
+		__dec_node_page_state(oldpage, NR_FILE_PAGES);
 	}
 	spin_unlock_irq(&swap_mapping->tree_lock);
 
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 69cb2464e7dc..ca49c3e41443 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -95,7 +95,7 @@ int __add_to_swap_cache(struct page *page, swp_entry_t entry)
 					entry.val, page);
 	if (likely(!error)) {
 		address_space->nrpages++;
-		__inc_zone_page_state(page, NR_FILE_PAGES);
+		__inc_node_page_state(page, NR_FILE_PAGES);
 		INC_CACHE_INFO(add_total);
 	}
 	spin_unlock_irq(&address_space->tree_lock);
@@ -147,7 +147,7 @@ void __delete_from_swap_cache(struct page *page)
 	set_page_private(page, 0);
 	ClearPageSwapCache(page);
 	address_space->nrpages--;
-	__dec_zone_page_state(page, NR_FILE_PAGES);
+	__dec_node_page_state(page, NR_FILE_PAGES);
 	INC_CACHE_INFO(del_total);
 }
 
diff --git a/mm/util.c b/mm/util.c
index 6cc81e7b8705..28aedb89a14a 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -496,7 +496,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 
 	if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) {
 		free = global_page_state(NR_FREE_PAGES);
-		free += global_page_state(NR_FILE_PAGES);
+		free += global_node_page_state(NR_FILE_PAGES);
 
 		/*
 		 * shmem pages shouldn't be counted as free in this
@@ -504,7 +504,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 		 * that won't affect the overall amount of available
 		 * memory in the system.
 		 */
-		free -= global_page_state(NR_SHMEM);
+		free -= global_node_page_state(NR_SHMEM);
 
 		free += get_nr_swap_pages();
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b13deefc671b..8f9dba34a953 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3591,11 +3591,11 @@ int sysctl_min_unmapped_ratio = 1;
  */
 int sysctl_min_slab_ratio = 5;
 
-static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
+static inline unsigned long node_unmapped_file_pages(struct pglist_data *pgdat)
 {
-	unsigned long file_mapped = node_page_state(zone->zone_pgdat, NR_FILE_MAPPED);
-	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
-		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
+	unsigned long file_mapped = node_page_state(pgdat, NR_FILE_MAPPED);
+	unsigned long file_lru = node_page_state(pgdat, NR_INACTIVE_FILE) +
+		node_page_state(pgdat, NR_ACTIVE_FILE);
 
 	/*
 	 * It's possible for there to be more file mapped pages than
@@ -3614,17 +3614,17 @@ static unsigned long zone_pagecache_reclaimable(struct zone *zone)
 	/*
 	 * If RECLAIM_UNMAP is set, then all file pages are considered
 	 * potentially reclaimable. Otherwise, we have to worry about
-	 * pages like swapcache and zone_unmapped_file_pages() provides
+	 * pages like swapcache and node_unmapped_file_pages() provides
 	 * a better estimate
 	 */
 	if (zone_reclaim_mode & RECLAIM_UNMAP)
-		nr_pagecache_reclaimable = zone_page_state(zone, NR_FILE_PAGES);
+		nr_pagecache_reclaimable = node_page_state(zone->zone_pgdat, NR_FILE_PAGES);
 	else
-		nr_pagecache_reclaimable = zone_unmapped_file_pages(zone);
+		nr_pagecache_reclaimable = node_unmapped_file_pages(zone->zone_pgdat);
 
 	/* If we can't clean pages, remove dirty pages from consideration */
 	if (!(zone_reclaim_mode & RECLAIM_WRITE))
-		delta += zone_page_state(zone, NR_FILE_DIRTY);
+		delta += node_page_state(zone->zone_pgdat, NR_FILE_DIRTY);
 
 	/* Watch for any possible underflows due to delta */
 	if (unlikely(delta > nr_pagecache_reclaimable))
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 4fd6d3f8764d..b4fee815f7b4 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -939,19 +939,13 @@ const char * const vmstat_text[] = {
 	"nr_free_pages",
 	"nr_alloc_batch",
 	"nr_mlock",
-	"nr_file_pages",
-	"nr_dirty",
-	"nr_writeback",
 	"nr_slab_reclaimable",
 	"nr_slab_unreclaimable",
 	"nr_page_table_pages",
 	"nr_kernel_stack",
-	"nr_unstable",
 	"nr_bounce",
 	"nr_vmscan_write",
 	"nr_vmscan_immediate_reclaim",
-	"nr_writeback_temp",
-	"nr_shmem",
 	"nr_dirtied",
 	"nr_written",
 
@@ -980,6 +974,12 @@ const char * const vmstat_text[] = {
 	"workingset_nodereclaim",
 	"nr_anon_pages",
 	"nr_mapped",
+	"nr_file_pages",
+	"nr_dirty",
+	"nr_writeback",
+	"nr_writeback_temp",
+	"nr_shmem",
+	"nr_unstable",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 19/27] mm: Move vmscan writes and file write accounting to the node
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (17 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 18/27] mm: Move most file-based accounting to the node Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman
  2016-04-06 11:20 ` [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

As reclaim is now node-based, it follows that page write activity
due to page reclaim should also be accounted for on the node. For
consistency, also account page writes and page dirtying on a per-node
basis.

After this patch, there are a few remaining zone counters that may
appear strange but are fine. NUMA stats are still per-zone as this is a
user-space interface that tools consume. NR_MLOCK, NR_SLAB_*, NR_PAGETABLE,
NR_KERNEL_STACK and NR_BOUNCE are all allocations that potentially pin
low memory and cannot trivially be reclaimed on demand. This information
is still useful for debugging a page allocation failure warning.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 include/linux/mmzone.h           | 8 ++++----
 include/trace/events/writeback.h | 4 ++--
 mm/page-writeback.c              | 6 +++---
 mm/vmscan.c                      | 4 ++--
 mm/vmstat.c                      | 8 ++++----
 5 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index b4f91e9278c5..3668df4a69b9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -125,10 +125,6 @@ enum zone_stat_item {
 	NR_KERNEL_STACK,
 	/* Second 128 byte cacheline */
 	NR_BOUNCE,
-	NR_VMSCAN_WRITE,
-	NR_VMSCAN_IMMEDIATE,	/* Prioritise for reclaim when writeback ends */
-	NR_DIRTIED,		/* page dirtyings since bootup */
-	NR_WRITTEN,		/* page writings since bootup */
 #ifdef CONFIG_NUMA
 	NUMA_HIT,		/* allocated in intended node */
 	NUMA_MISS,		/* allocated in non intended node */
@@ -163,6 +159,10 @@ enum node_stat_item {
 	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
 	NR_SHMEM,		/* shmem pages (included tmpfs/GEM pages) */
 	NR_UNSTABLE_NFS,	/* NFS unstable pages */
+	NR_VMSCAN_WRITE,
+	NR_VMSCAN_IMMEDIATE,	/* Prioritise for reclaim when writeback ends */
+	NR_DIRTIED,		/* page dirtyings since bootup */
+	NR_WRITTEN,		/* page writings since bootup */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index c581d9c04ca5..a1002cfede1d 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -415,8 +415,8 @@ TRACE_EVENT(global_dirty_state,
 		__entry->nr_dirty	= global_node_page_state(NR_FILE_DIRTY);
 		__entry->nr_writeback	= global_node_page_state(NR_WRITEBACK);
 		__entry->nr_unstable	= global_node_page_state(NR_UNSTABLE_NFS);
-		__entry->nr_dirtied	= global_page_state(NR_DIRTIED);
-		__entry->nr_written	= global_page_state(NR_WRITTEN);
+		__entry->nr_dirtied	= global_node_page_state(NR_DIRTIED);
+		__entry->nr_written	= global_node_page_state(NR_WRITTEN);
 		__entry->background_thresh = background_thresh;
 		__entry->dirty_thresh	= dirty_thresh;
 		__entry->dirty_limit	= global_wb_domain.dirty_limit;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 1e8c91281cc8..4e543702f395 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2429,7 +2429,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
 
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_DIRTY);
 		__inc_node_page_state(page, NR_FILE_DIRTY);
-		__inc_zone_page_state(page, NR_DIRTIED);
+		__inc_node_page_state(page, NR_DIRTIED);
 		__inc_wb_stat(wb, WB_RECLAIMABLE);
 		__inc_wb_stat(wb, WB_DIRTIED);
 		task_io_account_write(PAGE_CACHE_SIZE);
@@ -2517,7 +2517,7 @@ void account_page_redirty(struct page *page)
 
 		wb = unlocked_inode_to_wb_begin(inode, &locked);
 		current->nr_dirtied--;
-		dec_zone_page_state(page, NR_DIRTIED);
+		dec_node_page_state(page, NR_DIRTIED);
 		dec_wb_stat(wb, WB_DIRTIED);
 		unlocked_inode_to_wb_end(inode, locked);
 	}
@@ -2746,7 +2746,7 @@ int test_clear_page_writeback(struct page *page)
 	if (ret) {
 		mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_WRITEBACK);
 		dec_node_page_state(page, NR_WRITEBACK);
-		inc_zone_page_state(page, NR_WRITTEN);
+		inc_node_page_state(page, NR_WRITTEN);
 	}
 	unlock_page_memcg(page);
 	return ret;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8f9dba34a953..2f2072bc6884 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -596,7 +596,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
 			ClearPageReclaim(page);
 		}
 		trace_mm_vmscan_writepage(page);
-		inc_zone_page_state(page, NR_VMSCAN_WRITE);
+		inc_node_page_state(page, NR_VMSCAN_WRITE);
 		return PAGE_SUCCESS;
 	}
 
@@ -1095,7 +1095,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 				 * except we already have the page isolated
 				 * and know it's dirty
 				 */
-				inc_zone_page_state(page, NR_VMSCAN_IMMEDIATE);
+				inc_node_page_state(page, NR_VMSCAN_IMMEDIATE);
 				SetPageReclaim(page);
 
 				goto keep_locked;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index b4fee815f7b4..45ecff0f9f9f 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -944,10 +944,6 @@ const char * const vmstat_text[] = {
 	"nr_page_table_pages",
 	"nr_kernel_stack",
 	"nr_bounce",
-	"nr_vmscan_write",
-	"nr_vmscan_immediate_reclaim",
-	"nr_dirtied",
-	"nr_written",
 
 #ifdef CONFIG_NUMA
 	"numa_hit",
@@ -980,6 +976,10 @@ const char * const vmstat_text[] = {
 	"nr_writeback_temp",
 	"nr_shmem",
 	"nr_unstable",
+	"nr_vmscan_write",
+	"nr_vmscan_immediate_reclaim",
+	"nr_dirtied",
+	"nr_written",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (18 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 19/27] mm: Move vmscan writes and file write " Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  2016-04-06 11:20 ` [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

If buffer heads are over the limit then the direct reclaim gfp_mask
is promoted to __GFP_HIGHMEM so that lowmem is indirectly freed. With
node-based reclaim, it is also required that the classzone_idx be updated
or the pages will be skipped.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2f2072bc6884..0298c0977eac 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2575,8 +2575,10 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc,
 	 * highmem pages could be pinning lowmem pages storing buffer_heads
 	 */
 	orig_mask = sc->gfp_mask;
-	if (buffer_heads_over_limit)
+	if (buffer_heads_over_limit) {
 		sc->gfp_mask |= __GFP_HIGHMEM;
+		classzone_idx = gfp_zone(sc->gfp_mask);
+	}
 
 	for_each_zone_zonelist_nodemask(zone, z, zonelist,
 					classzone_idx, sc->nodemask) {
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone
  2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
                   ` (19 preceding siblings ...)
  2016-04-06 11:20 ` [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman
@ 2016-04-06 11:20 ` Mel Gorman
  20 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-06 11:20 UTC (permalink / raw)
  To: Linux-MM; +Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

kswapd is woken when zones are below the low watermark but the wakeup
decision is not taking the classzone into account.  Now that reclaim is
node-based, it is only required to wake kswapd once per node and only if
all zones are unbalanced for the requested classzone.

Note that one node might be checked multiple times but there is no cheap
way of tracking what nodes have already been visited for zoneslists that
be ordered by either zone or node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/vmscan.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0298c0977eac..9a1653fedd88 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3426,6 +3426,7 @@ static int kswapd(void *p)
 void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
 {
 	pg_data_t *pgdat;
+	int z;
 
 	if (!populated_zone(zone))
 		return;
@@ -3439,8 +3440,16 @@ void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
 	pgdat->kswapd_order = max(pgdat->kswapd_order, order);
 	if (!waitqueue_active(&pgdat->kswapd_wait))
 		return;
-	if (zone_balanced(zone, order, 0, 0))
-		return;
+
+	/* Only wake kswapd if all zones are unbalanced */
+	for (z = 0; z <= zone_idx(zone); z++) {
+		zone = pgdat->node_zones + z;
+		if (!populated_zone(zone))
+			continue;
+
+		if (zone_balanced(zone, order, 0, classzone_idx))
+			return;
+	}
 
 	trace_mm_vmscan_wakeup_kswapd(pgdat->node_id, zone_idx(zone), order);
 	wake_up_interruptible(&pgdat->kswapd_wait);
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* Re: [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-21 22:32   ` Andrew Morton
@ 2016-06-23  8:35     ` Mel Gorman
  0 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-06-23  8:35 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Linux-MM, Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML

On Tue, Jun 21, 2016 at 03:32:06PM -0700, Andrew Morton wrote:
> On Tue, 21 Jun 2016 15:15:55 +0100 Mel Gorman <mgorman@techsingularity.net> wrote:
> 
> > Reclaim makes decisions based on the number of pages that are mapped
> > but it's mixing node and zone information. Account NR_FILE_MAPPED and
> > NR_ANON_PAGES pages on the node.
> 
> <wading through rejects>
> 
> Boy, the difference between
> 
> 	__mod_zone_page_state(page_zone(page), ...
> 
> and
> 
> 	__mod_node_page_state(page_pgdat(page), ...
> 
> is looking subtle.  When and why to use one versus the other.  I'm not
> seeing any explanation of this in there but haven't yet looked hard.
> 

I'm not sure I see the problem. One applies for zone stats and the other
is for node. Granted, care is needed to use the correct one or a random
stat is updated instead of the one intended.


-- 
Mel Gorman
SUSE Labs

^ permalink raw reply	[flat|nested] 30+ messages in thread

* Re: [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-21 14:15 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
  2016-06-21 22:32   ` Andrew Morton
@ 2016-06-22 14:35   ` Michal Hocko
  1 sibling, 0 replies; 30+ messages in thread
From: Michal Hocko @ 2016-06-22 14:35 UTC (permalink / raw)
  To: Mel Gorman
  Cc: Andrew Morton, Linux-MM, Rik van Riel, Vlastimil Babka,
	Johannes Weiner, LKML

On Tue 21-06-16 15:15:55, Mel Gorman wrote:
> Reclaim makes decisions based on the number of pages that are mapped
> but it's mixing node and zone information. Account NR_FILE_MAPPED and
> NR_ANON_PAGES pages on the node.

So we will lose this stat in /proc/zoneinfo, but I am not really sure we
should bother much. I suspect we really want to introduce /proc/nodeinfo
and deprecate the first one. I didn't get to such a patch and maybe it
is not a part of the series, but I think we should eventually do it.

> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
>  arch/tile/mm/pgtable.c |  2 +-
>  drivers/base/node.c    |  4 ++--
>  fs/proc/meminfo.c      |  4 ++--
>  include/linux/mmzone.h |  6 +++---
>  mm/page_alloc.c        |  6 +++---
>  mm/rmap.c              | 12 ++++++------
>  mm/vmscan.c            |  2 +-
>  mm/vmstat.c            |  4 ++--
>  8 files changed, 20 insertions(+), 20 deletions(-)
> 
> diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
> index 9e389213580d..c606b0ef2f7e 100644
> --- a/arch/tile/mm/pgtable.c
> +++ b/arch/tile/mm/pgtable.c
> @@ -55,7 +55,7 @@ void show_mem(unsigned int filter)
>  	       global_page_state(NR_FREE_PAGES),
>  	       (global_page_state(NR_SLAB_RECLAIMABLE) +
>  		global_page_state(NR_SLAB_UNRECLAIMABLE)),
> -	       global_page_state(NR_FILE_MAPPED),
> +	       global_node_page_state(NR_FILE_MAPPED),
>  	       global_page_state(NR_PAGETABLE),
>  	       global_page_state(NR_BOUNCE),
>  	       global_page_state(NR_FILE_PAGES),
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index 4260c7f3ee1b..66aed68a0fdc 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -119,8 +119,8 @@ static ssize_t node_read_meminfo(struct device *dev,
>  		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
>  		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
>  		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
> -		       nid, K(sum_zone_node_page_state(nid, NR_FILE_MAPPED)),
> -		       nid, K(sum_zone_node_page_state(nid, NR_ANON_PAGES)),
> +		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
> +		       nid, K(node_page_state(pgdat, NR_ANON_PAGES)),
>  		       nid, K(i.sharedram),
>  		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
>  				THREAD_SIZE / 1024,
> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
> index 83720460c5bc..54e039682ec9 100644
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -138,8 +138,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>  		K(i.freeswap),
>  		K(global_page_state(NR_FILE_DIRTY)),
>  		K(global_page_state(NR_WRITEBACK)),
> -		K(global_page_state(NR_ANON_PAGES)),
> -		K(global_page_state(NR_FILE_MAPPED)),
> +		K(global_node_page_state(NR_ANON_PAGES)),
> +		K(global_node_page_state(NR_FILE_MAPPED)),
>  		K(i.sharedram),
>  		K(global_page_state(NR_SLAB_RECLAIMABLE) +
>  				global_page_state(NR_SLAB_UNRECLAIMABLE)),
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index ca9e05ca851d..8fafbd5fe74a 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -115,9 +115,6 @@ enum zone_stat_item {
>  	NR_ZONE_LRU_ANON = NR_ZONE_LRU_BASE,
>  	NR_ZONE_LRU_FILE,
>  	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
> -	NR_ANON_PAGES,	/* Mapped anonymous pages */
> -	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
> -			   only modified from process context */
>  	NR_FILE_PAGES,
>  	NR_FILE_DIRTY,
>  	NR_WRITEBACK,
> @@ -162,6 +159,9 @@ enum node_stat_item {
>  	WORKINGSET_REFAULT,
>  	WORKINGSET_ACTIVATE,
>  	WORKINGSET_NODERECLAIM,
> +	NR_ANON_PAGES,	/* Mapped anonymous pages */
> +	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
> +			   only modified from process context */
>  	NR_VM_NODE_STAT_ITEMS
>  };
>  
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 962e98e54fd2..cf3523f399e5 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4314,7 +4314,7 @@ void show_free_areas(unsigned int filter)
>  		global_page_state(NR_UNSTABLE_NFS),
>  		global_page_state(NR_SLAB_RECLAIMABLE),
>  		global_page_state(NR_SLAB_UNRECLAIMABLE),
> -		global_page_state(NR_FILE_MAPPED),
> +		global_node_page_state(NR_FILE_MAPPED),
>  		global_page_state(NR_SHMEM),
>  		global_page_state(NR_PAGETABLE),
>  		global_page_state(NR_BOUNCE),
> @@ -4331,6 +4331,7 @@ void show_free_areas(unsigned int filter)
>  			" unevictable:%lukB"
>  			" isolated(anon):%lukB"
>  			" isolated(file):%lukB"
> +			" mapped:%lukB"
>  			" all_unreclaimable? %s"
>  			"\n",
>  			pgdat->node_id,
> @@ -4341,6 +4342,7 @@ void show_free_areas(unsigned int filter)
>  			K(node_page_state(pgdat, NR_UNEVICTABLE)),
>  			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
>  			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
> +			K(node_page_state(pgdat, NR_FILE_MAPPED)),
>  			!pgdat_reclaimable(pgdat) ? "yes" : "no");
>  	}
>  
> @@ -4365,7 +4367,6 @@ void show_free_areas(unsigned int filter)
>  			" mlocked:%lukB"
>  			" dirty:%lukB"
>  			" writeback:%lukB"
> -			" mapped:%lukB"
>  			" shmem:%lukB"
>  			" slab_reclaimable:%lukB"
>  			" slab_unreclaimable:%lukB"
> @@ -4389,7 +4390,6 @@ void show_free_areas(unsigned int filter)
>  			K(zone_page_state(zone, NR_MLOCK)),
>  			K(zone_page_state(zone, NR_FILE_DIRTY)),
>  			K(zone_page_state(zone, NR_WRITEBACK)),
> -			K(zone_page_state(zone, NR_FILE_MAPPED)),
>  			K(zone_page_state(zone, NR_SHMEM)),
>  			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
>  			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 67457f691528..dea2d115d68f 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1219,7 +1219,7 @@ void do_page_add_anon_rmap(struct page *page,
>  			__inc_zone_page_state(page,
>  					      NR_ANON_TRANSPARENT_HUGEPAGES);
>  		}
> -		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
> +		__mod_node_page_state(page_pgdat(page), NR_ANON_PAGES, nr);
>  	}
>  	if (unlikely(PageKsm(page)))
>  		return;
> @@ -1263,7 +1263,7 @@ void page_add_new_anon_rmap(struct page *page,
>  		/* increment count (starts at -1) */
>  		atomic_set(&page->_mapcount, 0);
>  	}
> -	__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
> +	__mod_node_page_state(page_pgdat(page), NR_ANON_PAGES, nr);
>  	__page_set_anon_rmap(page, vma, address, 1);
>  }
>  
> @@ -1277,7 +1277,7 @@ void page_add_file_rmap(struct page *page)
>  {
>  	lock_page_memcg(page);
>  	if (atomic_inc_and_test(&page->_mapcount)) {
> -		__inc_zone_page_state(page, NR_FILE_MAPPED);
> +		__inc_node_page_state(page, NR_FILE_MAPPED);
>  		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
>  	}
>  	unlock_page_memcg(page);
> @@ -1303,7 +1303,7 @@ static void page_remove_file_rmap(struct page *page)
>  	 * these counters are not modified in interrupt context, and
>  	 * pte lock(a spinlock) is held, which implies preemption disabled.
>  	 */
> -	__dec_zone_page_state(page, NR_FILE_MAPPED);
> +	__dec_node_page_state(page, NR_FILE_MAPPED);
>  	mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
>  
>  	if (unlikely(PageMlocked(page)))
> @@ -1345,7 +1345,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
>  		clear_page_mlock(page);
>  
>  	if (nr) {
> -		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
> +		__mod_node_page_state(page_pgdat(page), NR_ANON_PAGES, -nr);
>  		deferred_split_huge_page(page);
>  	}
>  }
> @@ -1377,7 +1377,7 @@ void page_remove_rmap(struct page *page, bool compound)
>  	 * these counters are not modified in interrupt context, and
>  	 * pte lock(a spinlock) is held, which implies preemption disabled.
>  	 */
> -	__dec_zone_page_state(page, NR_ANON_PAGES);
> +	__dec_node_page_state(page, NR_ANON_PAGES);
>  
>  	if (unlikely(PageMlocked(page)))
>  		clear_page_mlock(page);
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index cf73bf4ebd06..c6e958079398 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -3596,7 +3596,7 @@ int sysctl_min_slab_ratio = 5;
>  
>  static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
>  {
> -	unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
> +	unsigned long file_mapped = node_page_state(zone->zone_pgdat, NR_FILE_MAPPED);
>  	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
>  		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
>  
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 81da18616ce6..12022ed481f0 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -924,8 +924,6 @@ const char * const vmstat_text[] = {
>  	"nr_zone_anon_lru",
>  	"nr_zone_file_lru",
>  	"nr_mlock",
> -	"nr_anon_pages",
> -	"nr_mapped",
>  	"nr_file_pages",
>  	"nr_dirty",
>  	"nr_writeback",
> @@ -967,6 +965,8 @@ const char * const vmstat_text[] = {
>  	"workingset_refault",
>  	"workingset_activate",
>  	"workingset_nodereclaim",
> +	"nr_anon_pages",
> +	"nr_mapped",
>  
>  	/* enum writeback_stat_item counters */
>  	"nr_dirty_threshold",
> -- 
> 2.6.4
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

-- 
Michal Hocko
SUSE Labs

^ permalink raw reply	[flat|nested] 30+ messages in thread

* Re: [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-21 14:15 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
@ 2016-06-21 22:32   ` Andrew Morton
  2016-06-23  8:35     ` Mel Gorman
  2016-06-22 14:35   ` Michal Hocko
  1 sibling, 1 reply; 30+ messages in thread
From: Andrew Morton @ 2016-06-21 22:32 UTC (permalink / raw)
  To: Mel Gorman; +Cc: Linux-MM, Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML

On Tue, 21 Jun 2016 15:15:55 +0100 Mel Gorman <mgorman@techsingularity.net> wrote:

> Reclaim makes decisions based on the number of pages that are mapped
> but it's mixing node and zone information. Account NR_FILE_MAPPED and
> NR_ANON_PAGES pages on the node.

<wading through rejects>

Boy, the difference between

	__mod_zone_page_state(page_zone(page), ...

and

	__mod_node_page_state(page_pgdat(page), ...

is looking subtle.  When and why to use one versus the other.  I'm not
seeing any explanation of this in there but haven't yet looked hard.

^ permalink raw reply	[flat|nested] 30+ messages in thread

* [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-21 14:15 [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman
@ 2016-06-21 14:15 ` Mel Gorman
  2016-06-21 22:32   ` Andrew Morton
  2016-06-22 14:35   ` Michal Hocko
  0 siblings, 2 replies; 30+ messages in thread
From: Mel Gorman @ 2016-06-21 14:15 UTC (permalink / raw)
  To: Andrew Morton, Linux-MM
  Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Reclaim makes decisions based on the number of pages that are mapped
but it's mixing node and zone information. Account NR_FILE_MAPPED and
NR_ANON_PAGES pages on the node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---
 arch/tile/mm/pgtable.c |  2 +-
 drivers/base/node.c    |  4 ++--
 fs/proc/meminfo.c      |  4 ++--
 include/linux/mmzone.h |  6 +++---
 mm/page_alloc.c        |  6 +++---
 mm/rmap.c              | 12 ++++++------
 mm/vmscan.c            |  2 +-
 mm/vmstat.c            |  4 ++--
 8 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 9e389213580d..c606b0ef2f7e 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -55,7 +55,7 @@ void show_mem(unsigned int filter)
 	       global_page_state(NR_FREE_PAGES),
 	       (global_page_state(NR_SLAB_RECLAIMABLE) +
 		global_page_state(NR_SLAB_UNRECLAIMABLE)),
-	       global_page_state(NR_FILE_MAPPED),
+	       global_node_page_state(NR_FILE_MAPPED),
 	       global_page_state(NR_PAGETABLE),
 	       global_page_state(NR_BOUNCE),
 	       global_page_state(NR_FILE_PAGES),
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 4260c7f3ee1b..66aed68a0fdc 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -119,8 +119,8 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
 		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
-		       nid, K(sum_zone_node_page_state(nid, NR_FILE_MAPPED)),
-		       nid, K(sum_zone_node_page_state(nid, NR_ANON_PAGES)),
+		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
+		       nid, K(node_page_state(pgdat, NR_ANON_PAGES)),
 		       nid, K(i.sharedram),
 		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 83720460c5bc..54e039682ec9 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -138,8 +138,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		K(i.freeswap),
 		K(global_page_state(NR_FILE_DIRTY)),
 		K(global_page_state(NR_WRITEBACK)),
-		K(global_page_state(NR_ANON_PAGES)),
-		K(global_page_state(NR_FILE_MAPPED)),
+		K(global_node_page_state(NR_ANON_PAGES)),
+		K(global_node_page_state(NR_FILE_MAPPED)),
 		K(i.sharedram),
 		K(global_page_state(NR_SLAB_RECLAIMABLE) +
 				global_page_state(NR_SLAB_UNRECLAIMABLE)),
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index ca9e05ca851d..8fafbd5fe74a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -115,9 +115,6 @@ enum zone_stat_item {
 	NR_ZONE_LRU_ANON = NR_ZONE_LRU_BASE,
 	NR_ZONE_LRU_FILE,
 	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
-	NR_ANON_PAGES,	/* Mapped anonymous pages */
-	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
-			   only modified from process context */
 	NR_FILE_PAGES,
 	NR_FILE_DIRTY,
 	NR_WRITEBACK,
@@ -162,6 +159,9 @@ enum node_stat_item {
 	WORKINGSET_REFAULT,
 	WORKINGSET_ACTIVATE,
 	WORKINGSET_NODERECLAIM,
+	NR_ANON_PAGES,	/* Mapped anonymous pages */
+	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
+			   only modified from process context */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 962e98e54fd2..cf3523f399e5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4314,7 +4314,7 @@ void show_free_areas(unsigned int filter)
 		global_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_SLAB_RECLAIMABLE),
 		global_page_state(NR_SLAB_UNRECLAIMABLE),
-		global_page_state(NR_FILE_MAPPED),
+		global_node_page_state(NR_FILE_MAPPED),
 		global_page_state(NR_SHMEM),
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE),
@@ -4331,6 +4331,7 @@ void show_free_areas(unsigned int filter)
 			" unevictable:%lukB"
 			" isolated(anon):%lukB"
 			" isolated(file):%lukB"
+			" mapped:%lukB"
 			" all_unreclaimable? %s"
 			"\n",
 			pgdat->node_id,
@@ -4341,6 +4342,7 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_UNEVICTABLE)),
 			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
 			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
+			K(node_page_state(pgdat, NR_FILE_MAPPED)),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
@@ -4365,7 +4367,6 @@ void show_free_areas(unsigned int filter)
 			" mlocked:%lukB"
 			" dirty:%lukB"
 			" writeback:%lukB"
-			" mapped:%lukB"
 			" shmem:%lukB"
 			" slab_reclaimable:%lukB"
 			" slab_unreclaimable:%lukB"
@@ -4389,7 +4390,6 @@ void show_free_areas(unsigned int filter)
 			K(zone_page_state(zone, NR_MLOCK)),
 			K(zone_page_state(zone, NR_FILE_DIRTY)),
 			K(zone_page_state(zone, NR_WRITEBACK)),
-			K(zone_page_state(zone, NR_FILE_MAPPED)),
 			K(zone_page_state(zone, NR_SHMEM)),
 			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
 			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
diff --git a/mm/rmap.c b/mm/rmap.c
index 67457f691528..dea2d115d68f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1219,7 +1219,7 @@ void do_page_add_anon_rmap(struct page *page,
 			__inc_zone_page_state(page,
 					      NR_ANON_TRANSPARENT_HUGEPAGES);
 		}
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+		__mod_node_page_state(page_pgdat(page), NR_ANON_PAGES, nr);
 	}
 	if (unlikely(PageKsm(page)))
 		return;
@@ -1263,7 +1263,7 @@ void page_add_new_anon_rmap(struct page *page,
 		/* increment count (starts at -1) */
 		atomic_set(&page->_mapcount, 0);
 	}
-	__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+	__mod_node_page_state(page_pgdat(page), NR_ANON_PAGES, nr);
 	__page_set_anon_rmap(page, vma, address, 1);
 }
 
@@ -1277,7 +1277,7 @@ void page_add_file_rmap(struct page *page)
 {
 	lock_page_memcg(page);
 	if (atomic_inc_and_test(&page->_mapcount)) {
-		__inc_zone_page_state(page, NR_FILE_MAPPED);
+		__inc_node_page_state(page, NR_FILE_MAPPED);
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 	}
 	unlock_page_memcg(page);
@@ -1303,7 +1303,7 @@ static void page_remove_file_rmap(struct page *page)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_FILE_MAPPED);
+	__dec_node_page_state(page, NR_FILE_MAPPED);
 	mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 
 	if (unlikely(PageMlocked(page)))
@@ -1345,7 +1345,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
 		clear_page_mlock(page);
 
 	if (nr) {
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
+		__mod_node_page_state(page_pgdat(page), NR_ANON_PAGES, -nr);
 		deferred_split_huge_page(page);
 	}
 }
@@ -1377,7 +1377,7 @@ void page_remove_rmap(struct page *page, bool compound)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_ANON_PAGES);
+	__dec_node_page_state(page, NR_ANON_PAGES);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cf73bf4ebd06..c6e958079398 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3596,7 +3596,7 @@ int sysctl_min_slab_ratio = 5;
 
 static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
 {
-	unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
+	unsigned long file_mapped = node_page_state(zone->zone_pgdat, NR_FILE_MAPPED);
 	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
 		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
 
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 81da18616ce6..12022ed481f0 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -924,8 +924,6 @@ const char * const vmstat_text[] = {
 	"nr_zone_anon_lru",
 	"nr_zone_file_lru",
 	"nr_mlock",
-	"nr_anon_pages",
-	"nr_mapped",
 	"nr_file_pages",
 	"nr_dirty",
 	"nr_writeback",
@@ -967,6 +965,8 @@ const char * const vmstat_text[] = {
 	"workingset_refault",
 	"workingset_activate",
 	"workingset_nodereclaim",
+	"nr_anon_pages",
+	"nr_mapped",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* Re: [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-16 15:52   ` Vlastimil Babka
@ 2016-06-16 16:04     ` Mel Gorman
  0 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-06-16 16:04 UTC (permalink / raw)
  To: Vlastimil Babka
  Cc: Andrew Morton, Linux-MM, Rik van Riel, Johannes Weiner, LKML

On Thu, Jun 16, 2016 at 05:52:59PM +0200, Vlastimil Babka wrote:
> On 06/09/2016 08:04 PM, Mel Gorman wrote:
> >Reclaim makes decisions based on the number of file pages that are mapped but
> >it's mixing node and zone information. Account NR_FILE_MAPPED pages on the node.
> 
> And NR_ANON_PAGES.
> 

Yes.

> >Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> 
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> 
> I've noticed some new "page_zone(page)->zone_pgdat" instances here.
> 

FWIW, I created a page_pgdat helper and converted all patterns like this
introduced by the series to the helper. There are other potential users
of the helper in the tree that are not touched by the patches but I left
them to preserve history.

-- 
Mel Gorman
SUSE Labs

^ permalink raw reply	[flat|nested] 30+ messages in thread

* Re: [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-09 18:04 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
@ 2016-06-16 15:52   ` Vlastimil Babka
  2016-06-16 16:04     ` Mel Gorman
  0 siblings, 1 reply; 30+ messages in thread
From: Vlastimil Babka @ 2016-06-16 15:52 UTC (permalink / raw)
  To: Mel Gorman, Andrew Morton, Linux-MM; +Cc: Rik van Riel, Johannes Weiner, LKML

On 06/09/2016 08:04 PM, Mel Gorman wrote:
> Reclaim makes decisions based on the number of file pages that are mapped but
> it's mixing node and zone information. Account NR_FILE_MAPPED pages on the node.

And NR_ANON_PAGES.

> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>

Acked-by: Vlastimil Babka <vbabka@suse.cz>

I've noticed some new "page_zone(page)->zone_pgdat" instances here.

^ permalink raw reply	[flat|nested] 30+ messages in thread

* [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-06-09 18:04 [PATCH 00/27] Move LRU page reclaim from zones to nodes v6 Mel Gorman
@ 2016-06-09 18:04 ` Mel Gorman
  2016-06-16 15:52   ` Vlastimil Babka
  0 siblings, 1 reply; 30+ messages in thread
From: Mel Gorman @ 2016-06-09 18:04 UTC (permalink / raw)
  To: Andrew Morton, Linux-MM
  Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner, LKML, Mel Gorman

Reclaim makes decisions based on the number of file pages that are mapped but
it's mixing node and zone information. Account NR_FILE_MAPPED pages on the node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 arch/tile/mm/pgtable.c |  2 +-
 drivers/base/node.c    |  4 ++--
 fs/proc/meminfo.c      |  4 ++--
 include/linux/mmzone.h |  6 +++---
 mm/page_alloc.c        |  6 +++---
 mm/rmap.c              | 13 +++++++------
 mm/vmscan.c            |  2 +-
 mm/vmstat.c            |  4 ++--
 8 files changed, 21 insertions(+), 20 deletions(-)

diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 9e389213580d..c606b0ef2f7e 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -55,7 +55,7 @@ void show_mem(unsigned int filter)
 	       global_page_state(NR_FREE_PAGES),
 	       (global_page_state(NR_SLAB_RECLAIMABLE) +
 		global_page_state(NR_SLAB_UNRECLAIMABLE)),
-	       global_page_state(NR_FILE_MAPPED),
+	       global_node_page_state(NR_FILE_MAPPED),
 	       global_page_state(NR_PAGETABLE),
 	       global_page_state(NR_BOUNCE),
 	       global_page_state(NR_FILE_PAGES),
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 4260c7f3ee1b..66aed68a0fdc 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -119,8 +119,8 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
 		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
-		       nid, K(sum_zone_node_page_state(nid, NR_FILE_MAPPED)),
-		       nid, K(sum_zone_node_page_state(nid, NR_ANON_PAGES)),
+		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
+		       nid, K(node_page_state(pgdat, NR_ANON_PAGES)),
 		       nid, K(i.sharedram),
 		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 83720460c5bc..54e039682ec9 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -138,8 +138,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		K(i.freeswap),
 		K(global_page_state(NR_FILE_DIRTY)),
 		K(global_page_state(NR_WRITEBACK)),
-		K(global_page_state(NR_ANON_PAGES)),
-		K(global_page_state(NR_FILE_MAPPED)),
+		K(global_node_page_state(NR_ANON_PAGES)),
+		K(global_node_page_state(NR_FILE_MAPPED)),
 		K(i.sharedram),
 		K(global_page_state(NR_SLAB_RECLAIMABLE) +
 				global_page_state(NR_SLAB_UNRECLAIMABLE)),
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 5de2fc2dd0e6..eac00a55e098 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -112,9 +112,6 @@ enum zone_stat_item {
 	NR_FREE_PAGES,
 	NR_ALLOC_BATCH,
 	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
-	NR_ANON_PAGES,	/* Mapped anonymous pages */
-	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
-			   only modified from process context */
 	NR_FILE_PAGES,
 	NR_FILE_DIRTY,
 	NR_WRITEBACK,
@@ -159,6 +156,9 @@ enum node_stat_item {
 	WORKINGSET_REFAULT,
 	WORKINGSET_ACTIVATE,
 	WORKINGSET_NODERECLAIM,
+	NR_ANON_PAGES,	/* Mapped anonymous pages */
+	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
+			   only modified from process context */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 37e7b909ba48..1ba0c98d9461 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4323,7 +4323,7 @@ void show_free_areas(unsigned int filter)
 		global_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_SLAB_RECLAIMABLE),
 		global_page_state(NR_SLAB_UNRECLAIMABLE),
-		global_page_state(NR_FILE_MAPPED),
+		global_node_page_state(NR_FILE_MAPPED),
 		global_page_state(NR_SHMEM),
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE),
@@ -4340,6 +4340,7 @@ void show_free_areas(unsigned int filter)
 			" unevictable:%lukB"
 			" isolated(anon):%lukB"
 			" isolated(file):%lukB"
+			" mapped:%lukB"
 			" all_unreclaimable? %s"
 			"\n",
 			pgdat->node_id,
@@ -4350,6 +4351,7 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_UNEVICTABLE)),
 			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
 			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
+			K(node_page_state(pgdat, NR_FILE_MAPPED)),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
@@ -4374,7 +4376,6 @@ void show_free_areas(unsigned int filter)
 			" mlocked:%lukB"
 			" dirty:%lukB"
 			" writeback:%lukB"
-			" mapped:%lukB"
 			" shmem:%lukB"
 			" slab_reclaimable:%lukB"
 			" slab_unreclaimable:%lukB"
@@ -4398,7 +4399,6 @@ void show_free_areas(unsigned int filter)
 			K(zone_page_state(zone, NR_MLOCK)),
 			K(zone_page_state(zone, NR_FILE_DIRTY)),
 			K(zone_page_state(zone, NR_WRITEBACK)),
-			K(zone_page_state(zone, NR_FILE_MAPPED)),
 			K(zone_page_state(zone, NR_SHMEM)),
 			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
 			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
diff --git a/mm/rmap.c b/mm/rmap.c
index 67457f691528..ab3d7a3151c3 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1219,7 +1219,8 @@ void do_page_add_anon_rmap(struct page *page,
 			__inc_zone_page_state(page,
 					      NR_ANON_TRANSPARENT_HUGEPAGES);
 		}
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat,
+				NR_ANON_PAGES, nr);
 	}
 	if (unlikely(PageKsm(page)))
 		return;
@@ -1263,7 +1264,7 @@ void page_add_new_anon_rmap(struct page *page,
 		/* increment count (starts at -1) */
 		atomic_set(&page->_mapcount, 0);
 	}
-	__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, nr);
 	__page_set_anon_rmap(page, vma, address, 1);
 }
 
@@ -1277,7 +1278,7 @@ void page_add_file_rmap(struct page *page)
 {
 	lock_page_memcg(page);
 	if (atomic_inc_and_test(&page->_mapcount)) {
-		__inc_zone_page_state(page, NR_FILE_MAPPED);
+		__inc_node_page_state(page, NR_FILE_MAPPED);
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 	}
 	unlock_page_memcg(page);
@@ -1303,7 +1304,7 @@ static void page_remove_file_rmap(struct page *page)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_FILE_MAPPED);
+	__dec_node_page_state(page, NR_FILE_MAPPED);
 	mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 
 	if (unlikely(PageMlocked(page)))
@@ -1345,7 +1346,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
 		clear_page_mlock(page);
 
 	if (nr) {
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, -nr);
 		deferred_split_huge_page(page);
 	}
 }
@@ -1377,7 +1378,7 @@ void page_remove_rmap(struct page *page, bool compound)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_ANON_PAGES);
+	__dec_node_page_state(page, NR_ANON_PAGES);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cad6409e798e..56482c3fbc76 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3556,7 +3556,7 @@ int sysctl_min_slab_ratio = 5;
 
 static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
 {
-	unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
+	unsigned long file_mapped = node_page_state(zone->zone_pgdat, NR_FILE_MAPPED);
 	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
 		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
 
diff --git a/mm/vmstat.c b/mm/vmstat.c
index fff9614044c7..960f549a7b1a 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -922,8 +922,6 @@ const char * const vmstat_text[] = {
 	"nr_free_pages",
 	"nr_alloc_batch",
 	"nr_mlock",
-	"nr_anon_pages",
-	"nr_mapped",
 	"nr_file_pages",
 	"nr_dirty",
 	"nr_writeback",
@@ -965,6 +963,8 @@ const char * const vmstat_text[] = {
 	"workingset_refault",
 	"workingset_activate",
 	"workingset_nodereclaim",
+	"nr_anon_pages",
+	"nr_mapped",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

* [PATCH 16/27] mm: Move page mapped accounting to the node
  2016-04-15  9:13 [PATCH 00/27] Move LRU page reclaim from zones to nodes v5 Mel Gorman
@ 2016-04-15  9:13 ` Mel Gorman
  0 siblings, 0 replies; 30+ messages in thread
From: Mel Gorman @ 2016-04-15  9:13 UTC (permalink / raw)
  To: Andrew Morton, Linux-MM
  Cc: Rik van Riel, Vlastimil Babka, Johannes Weiner,
	Jesper Dangaard Brouer, LKML, Mel Gorman

Reclaim makes decisions based on the number of file pages that are mapped but
it's mixing node and zone information. Account NR_FILE_MAPPED pages on the node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 arch/tile/mm/pgtable.c |  2 +-
 drivers/base/node.c    |  4 ++--
 fs/proc/meminfo.c      |  4 ++--
 include/linux/mmzone.h |  6 +++---
 mm/page_alloc.c        |  6 +++---
 mm/rmap.c              | 13 +++++++------
 mm/vmscan.c            |  2 +-
 mm/vmstat.c            |  4 ++--
 8 files changed, 21 insertions(+), 20 deletions(-)

diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 3ed0a666d44a..2e784e84bd6f 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -55,7 +55,7 @@ void show_mem(unsigned int filter)
 	       global_page_state(NR_FREE_PAGES),
 	       (global_page_state(NR_SLAB_RECLAIMABLE) +
 		global_page_state(NR_SLAB_UNRECLAIMABLE)),
-	       global_page_state(NR_FILE_MAPPED),
+	       global_node_page_state(NR_FILE_MAPPED),
 	       global_page_state(NR_PAGETABLE),
 	       global_page_state(NR_BOUNCE),
 	       global_page_state(NR_FILE_PAGES),
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 4260c7f3ee1b..66aed68a0fdc 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -119,8 +119,8 @@ static ssize_t node_read_meminfo(struct device *dev,
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_DIRTY)),
 		       nid, K(sum_zone_node_page_state(nid, NR_WRITEBACK)),
 		       nid, K(sum_zone_node_page_state(nid, NR_FILE_PAGES)),
-		       nid, K(sum_zone_node_page_state(nid, NR_FILE_MAPPED)),
-		       nid, K(sum_zone_node_page_state(nid, NR_ANON_PAGES)),
+		       nid, K(node_page_state(pgdat, NR_FILE_MAPPED)),
+		       nid, K(node_page_state(pgdat, NR_ANON_PAGES)),
 		       nid, K(i.sharedram),
 		       nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK) *
 				THREAD_SIZE / 1024,
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 83720460c5bc..54e039682ec9 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -138,8 +138,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		K(i.freeswap),
 		K(global_page_state(NR_FILE_DIRTY)),
 		K(global_page_state(NR_WRITEBACK)),
-		K(global_page_state(NR_ANON_PAGES)),
-		K(global_page_state(NR_FILE_MAPPED)),
+		K(global_node_page_state(NR_ANON_PAGES)),
+		K(global_node_page_state(NR_FILE_MAPPED)),
 		K(i.sharedram),
 		K(global_page_state(NR_SLAB_RECLAIMABLE) +
 				global_page_state(NR_SLAB_UNRECLAIMABLE)),
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 63b8a946e108..c6d59b60caec 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -112,9 +112,6 @@ enum zone_stat_item {
 	NR_FREE_PAGES,
 	NR_ALLOC_BATCH,
 	NR_MLOCK,		/* mlock()ed pages found and moved off LRU */
-	NR_ANON_PAGES,	/* Mapped anonymous pages */
-	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
-			   only modified from process context */
 	NR_FILE_PAGES,
 	NR_FILE_DIRTY,
 	NR_WRITEBACK,
@@ -156,6 +153,9 @@ enum node_stat_item {
 	WORKINGSET_REFAULT,
 	WORKINGSET_ACTIVATE,
 	WORKINGSET_NODERECLAIM,
+	NR_ANON_PAGES,	/* Mapped anonymous pages */
+	NR_FILE_MAPPED,	/* pagecache pages mapped into pagetables.
+			   only modified from process context */
 	NR_VM_NODE_STAT_ITEMS
 };
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 63745685c175..550b11691fbf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4155,7 +4155,7 @@ void show_free_areas(unsigned int filter)
 		global_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_SLAB_RECLAIMABLE),
 		global_page_state(NR_SLAB_UNRECLAIMABLE),
-		global_page_state(NR_FILE_MAPPED),
+		global_node_page_state(NR_FILE_MAPPED),
 		global_page_state(NR_SHMEM),
 		global_page_state(NR_PAGETABLE),
 		global_page_state(NR_BOUNCE),
@@ -4172,6 +4172,7 @@ void show_free_areas(unsigned int filter)
 			" unevictable:%lukB"
 			" isolated(anon):%lukB"
 			" isolated(file):%lukB"
+			" mapped:%lukB"
 			" all_unreclaimable? %s"
 			"\n",
 			pgdat->node_id,
@@ -4182,6 +4183,7 @@ void show_free_areas(unsigned int filter)
 			K(node_page_state(pgdat, NR_UNEVICTABLE)),
 			K(node_page_state(pgdat, NR_ISOLATED_ANON)),
 			K(node_page_state(pgdat, NR_ISOLATED_FILE)),
+			K(node_page_state(pgdat, NR_FILE_MAPPED)),
 			!pgdat_reclaimable(pgdat) ? "yes" : "no");
 	}
 
@@ -4206,7 +4208,6 @@ void show_free_areas(unsigned int filter)
 			" mlocked:%lukB"
 			" dirty:%lukB"
 			" writeback:%lukB"
-			" mapped:%lukB"
 			" shmem:%lukB"
 			" slab_reclaimable:%lukB"
 			" slab_unreclaimable:%lukB"
@@ -4230,7 +4231,6 @@ void show_free_areas(unsigned int filter)
 			K(zone_page_state(zone, NR_MLOCK)),
 			K(zone_page_state(zone, NR_FILE_DIRTY)),
 			K(zone_page_state(zone, NR_WRITEBACK)),
-			K(zone_page_state(zone, NR_FILE_MAPPED)),
 			K(zone_page_state(zone, NR_SHMEM)),
 			K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
 			K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
diff --git a/mm/rmap.c b/mm/rmap.c
index 48f53dcc7a6d..b27b87653c36 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1217,7 +1217,8 @@ void do_page_add_anon_rmap(struct page *page,
 			__inc_zone_page_state(page,
 					      NR_ANON_TRANSPARENT_HUGEPAGES);
 		}
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat,
+				NR_ANON_PAGES, nr);
 	}
 	if (unlikely(PageKsm(page)))
 		return;
@@ -1261,7 +1262,7 @@ void page_add_new_anon_rmap(struct page *page,
 		/* increment count (starts at -1) */
 		atomic_set(&page->_mapcount, 0);
 	}
-	__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
+	__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, nr);
 	__page_set_anon_rmap(page, vma, address, 1);
 }
 
@@ -1275,7 +1276,7 @@ void page_add_file_rmap(struct page *page)
 {
 	lock_page_memcg(page);
 	if (atomic_inc_and_test(&page->_mapcount)) {
-		__inc_zone_page_state(page, NR_FILE_MAPPED);
+		__inc_node_page_state(page, NR_FILE_MAPPED);
 		mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 	}
 	unlock_page_memcg(page);
@@ -1301,7 +1302,7 @@ static void page_remove_file_rmap(struct page *page)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_FILE_MAPPED);
+	__dec_node_page_state(page, NR_FILE_MAPPED);
 	mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
 
 	if (unlikely(PageMlocked(page)))
@@ -1343,7 +1344,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
 		clear_page_mlock(page);
 
 	if (nr) {
-		__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, -nr);
+		__mod_node_page_state(page_zone(page)->zone_pgdat, NR_ANON_PAGES, -nr);
 		deferred_split_huge_page(page);
 	}
 }
@@ -1375,7 +1376,7 @@ void page_remove_rmap(struct page *page, bool compound)
 	 * these counters are not modified in interrupt context, and
 	 * pte lock(a spinlock) is held, which implies preemption disabled.
 	 */
-	__dec_zone_page_state(page, NR_ANON_PAGES);
+	__dec_node_page_state(page, NR_ANON_PAGES);
 
 	if (unlikely(PageMlocked(page)))
 		clear_page_mlock(page);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9cf27598f49f..e1ba1f2ada6b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3590,7 +3590,7 @@ int sysctl_min_slab_ratio = 5;
 
 static inline unsigned long zone_unmapped_file_pages(struct zone *zone)
 {
-	unsigned long file_mapped = zone_page_state(zone, NR_FILE_MAPPED);
+	unsigned long file_mapped = node_page_state(zone->zone_pgdat, NR_FILE_MAPPED);
 	unsigned long file_lru = node_page_state(zone->zone_pgdat, NR_INACTIVE_FILE) +
 		node_page_state(zone->zone_pgdat, NR_ACTIVE_FILE);
 
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 3cb871ca06e2..f4f8f27b9c30 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -916,8 +916,6 @@ const char * const vmstat_text[] = {
 	"nr_free_pages",
 	"nr_alloc_batch",
 	"nr_mlock",
-	"nr_anon_pages",
-	"nr_mapped",
 	"nr_file_pages",
 	"nr_dirty",
 	"nr_writeback",
@@ -957,6 +955,8 @@ const char * const vmstat_text[] = {
 	"workingset_refault",
 	"workingset_activate",
 	"workingset_nodereclaim",
+	"nr_anon_pages",
+	"nr_mapped",
 
 	/* enum writeback_stat_item counters */
 	"nr_dirty_threshold",
-- 
2.6.4

^ permalink raw reply related	[flat|nested] 30+ messages in thread

end of thread, other threads:[~2016-06-23  8:35 UTC | newest]

Thread overview: 30+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-04-06 11:19 [RFC PATCH 00/27] Move LRU page reclaim from zones to nodes v3 Mel Gorman
2016-04-06 11:20 ` [PATCH 01/27] mm, page_alloc: Use ac->classzone_idx instead of zone_idx(preferred_zone) Mel Gorman
2016-04-06 11:20 ` [PATCH 02/27] mm, vmstat: Add infrastructure for per-node vmstats Mel Gorman
2016-04-06 11:20 ` [PATCH 03/27] mm, vmscan: Move lru_lock to the node Mel Gorman
2016-04-06 11:20 ` [PATCH 04/27] mm, vmscan: Move LRU lists to node Mel Gorman
2016-04-06 11:20 ` [PATCH 05/27] mm, vmscan: Begin reclaiming pages on a per-node basis Mel Gorman
2016-04-06 11:20 ` [PATCH 06/27] mm, vmscan: Have kswapd only scan based on the highest requested zone Mel Gorman
2016-04-06 11:20 ` [PATCH 07/27] mm, vmscan: Make kswapd reclaim in terms of nodes Mel Gorman
2016-04-06 11:20 ` [PATCH 08/27] mm, vmscan: Simplify the logic deciding whether kswapd sleeps Mel Gorman
2016-04-06 11:20 ` [PATCH 09/27] mm, vmscan: By default have direct reclaim only shrink once per node Mel Gorman
2016-04-06 11:20 ` [PATCH 10/27] mm, vmscan: Clear congestion, dirty and need for compaction on a per-node basis Mel Gorman
2016-04-06 11:20 ` [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman
2016-04-06 11:20 ` [PATCH 12/27] mm, vmscan: Make shrink_node decisions more node-centric Mel Gorman
2016-04-06 11:20 ` [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman
2016-04-06 11:20 ` [PATCH 14/27] mm, workingset: Make working set detection node-aware Mel Gorman
2016-04-06 11:20 ` [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman
2016-04-06 11:20 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
2016-04-06 11:20 ` [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman
2016-04-06 11:20 ` [PATCH 18/27] mm: Move most file-based accounting to the node Mel Gorman
2016-04-06 11:20 ` [PATCH 19/27] mm: Move vmscan writes and file write " Mel Gorman
2016-04-06 11:20 ` [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman
2016-04-06 11:20 ` [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman
2016-04-15  9:13 [PATCH 00/27] Move LRU page reclaim from zones to nodes v5 Mel Gorman
2016-04-15  9:13 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
2016-06-09 18:04 [PATCH 00/27] Move LRU page reclaim from zones to nodes v6 Mel Gorman
2016-06-09 18:04 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
2016-06-16 15:52   ` Vlastimil Babka
2016-06-16 16:04     ` Mel Gorman
2016-06-21 14:15 [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman
2016-06-21 14:15 ` [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman
2016-06-21 22:32   ` Andrew Morton
2016-06-23  8:35     ` Mel Gorman
2016-06-22 14:35   ` Michal Hocko

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