From: Minchan Kim <minchan@kernel.org> To: Mel Gorman <mgorman@techsingularity.net> Cc: Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 02/31] mm, vmscan: move lru_lock to the node Date: Tue, 5 Jul 2016 09:03:56 +0900 [thread overview] Message-ID: <20160705000356.GA28164@bbox> (raw) In-Reply-To: <1467403299-25786-3-git-send-email-mgorman@techsingularity.net> On Fri, Jul 01, 2016 at 09:01:10PM +0100, Mel Gorman wrote: > 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> > Acked-by: Vlastimil Babka <vbabka@suse.cz> > --- > 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 | 10 +++---- > mm/filemap.c | 4 +-- > mm/huge_memory.c | 6 ++--- > 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, 75 insertions(+), 69 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 b14abf217239..946e69103cdd 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 e093e1d3285b..ca2ed9a6c8d8 100644 > --- a/include/linux/mm_types.h > +++ b/include/linux/mm_types.h > @@ -118,7 +118,7 @@ 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 078ecb81e209..2d5087e3c034 100644 > --- a/include/linux/mmzone.h > +++ b/include/linux/mmzone.h > @@ -93,7 +93,7 @@ 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. > @@ -496,7 +496,6 @@ struct zone { > /* Write-intensive fields used by page reclaim */ > > /* Fields commonly accessed by the page reclaim scanner */ > - spinlock_t lru_lock; > struct lruvec lruvec; > > /* > @@ -690,6 +689,9 @@ 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 */ page reclaim. > + ZONE_PADDING(_pad1_) > + spinlock_t lru_lock; > > #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT > /* Otherwise, looks good to me. Reviewed-by: Minchan Kim <minchan@kernel.org>
WARNING: multiple messages have this Message-ID (diff)
From: Minchan Kim <minchan@kernel.org> To: Mel Gorman <mgorman@techsingularity.net> Cc: Andrew Morton <akpm@linux-foundation.org>, Linux-MM <linux-mm@kvack.org>, Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 02/31] mm, vmscan: move lru_lock to the node Date: Tue, 5 Jul 2016 09:03:56 +0900 [thread overview] Message-ID: <20160705000356.GA28164@bbox> (raw) In-Reply-To: <1467403299-25786-3-git-send-email-mgorman@techsingularity.net> On Fri, Jul 01, 2016 at 09:01:10PM +0100, Mel Gorman wrote: > 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> > Acked-by: Vlastimil Babka <vbabka@suse.cz> > --- > 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 | 10 +++---- > mm/filemap.c | 4 +-- > mm/huge_memory.c | 6 ++--- > 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, 75 insertions(+), 69 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 b14abf217239..946e69103cdd 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 e093e1d3285b..ca2ed9a6c8d8 100644 > --- a/include/linux/mm_types.h > +++ b/include/linux/mm_types.h > @@ -118,7 +118,7 @@ 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 078ecb81e209..2d5087e3c034 100644 > --- a/include/linux/mmzone.h > +++ b/include/linux/mmzone.h > @@ -93,7 +93,7 @@ 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. > @@ -496,7 +496,6 @@ struct zone { > /* Write-intensive fields used by page reclaim */ > > /* Fields commonly accessed by the page reclaim scanner */ > - spinlock_t lru_lock; > struct lruvec lruvec; > > /* > @@ -690,6 +689,9 @@ 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 */ page reclaim. > + ZONE_PADDING(_pad1_) > + spinlock_t lru_lock; > > #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT > /* Otherwise, looks good to me. Reviewed-by: Minchan Kim <minchan@kernel.org> -- 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>
next prev parent reply other threads:[~2016-07-05 0:03 UTC|newest] Thread overview: 181+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-01 20:01 [PATCH 00/31] Move LRU page reclaim from zones to nodes v8 Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 01/31] mm, vmstat: add infrastructure for per-node vmstats Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-04 23:50 ` Minchan Kim 2016-07-04 23:50 ` Minchan Kim 2016-07-05 8:14 ` Mel Gorman 2016-07-05 8:14 ` Mel Gorman 2016-07-06 0:15 ` Minchan Kim 2016-07-06 0:15 ` Minchan Kim 2016-07-01 20:01 ` [PATCH 02/31] mm, vmscan: move lru_lock to the node Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-05 0:03 ` Minchan Kim [this message] 2016-07-05 0:03 ` Minchan Kim 2016-07-01 20:01 ` [PATCH 03/31] mm, vmscan: move LRU lists to node Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-05 1:19 ` Minchan Kim 2016-07-05 1:19 ` Minchan Kim 2016-07-05 10:14 ` Mel Gorman 2016-07-05 10:14 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 04/31] mm, vmscan: begin reclaiming pages on a per-node basis Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-07 1:12 ` Joonsoo Kim 2016-07-07 1:12 ` Joonsoo Kim 2016-07-07 9:48 ` Mel Gorman 2016-07-07 9:48 ` Mel Gorman 2016-07-08 2:28 ` Joonsoo Kim 2016-07-08 2:28 ` Joonsoo Kim 2016-07-08 10:05 ` Mel Gorman 2016-07-08 10:05 ` Mel Gorman 2016-07-14 6:28 ` Joonsoo Kim 2016-07-14 6:28 ` Joonsoo Kim 2016-07-14 7:48 ` Vlastimil Babka 2016-07-14 7:48 ` Vlastimil Babka 2016-07-18 4:52 ` Joonsoo Kim 2016-07-18 4:52 ` Joonsoo Kim 2016-07-18 12:11 ` Mel Gorman 2016-07-18 12:11 ` Mel Gorman 2016-07-18 14:27 ` Mel Gorman 2016-07-18 14:27 ` Mel Gorman 2016-07-19 8:30 ` Joonsoo Kim 2016-07-19 8:30 ` Joonsoo Kim 2016-07-19 14:25 ` Mel Gorman 2016-07-19 14:25 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 05/31] mm, vmscan: have kswapd only scan based on the highest requested zone Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 06/31] mm, vmscan: make kswapd reclaim in terms of nodes Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 07/31] mm, vmscan: remove balance gap Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 08/31] mm, vmscan: simplify the logic deciding whether kswapd sleeps Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-05 5:59 ` Minchan Kim 2016-07-05 5:59 ` Minchan Kim 2016-07-05 10:26 ` Mel Gorman 2016-07-05 10:26 ` Mel Gorman 2016-07-06 0:30 ` Minchan Kim 2016-07-06 0:30 ` Minchan Kim 2016-07-06 8:31 ` Mel Gorman 2016-07-06 8:31 ` Mel Gorman 2016-07-07 5:51 ` Minchan Kim 2016-07-07 5:51 ` Minchan Kim 2016-07-07 9:56 ` Mel Gorman 2016-07-07 9:56 ` Mel Gorman 2016-07-07 1:20 ` Joonsoo Kim 2016-07-07 1:20 ` Joonsoo Kim 2016-07-07 10:17 ` Mel Gorman 2016-07-07 10:17 ` Mel Gorman 2016-07-08 2:44 ` Joonsoo Kim 2016-07-08 2:44 ` Joonsoo Kim 2016-07-08 10:11 ` Mel Gorman 2016-07-08 10:11 ` Mel Gorman 2016-07-14 5:23 ` Joonsoo Kim 2016-07-14 5:23 ` Joonsoo Kim 2016-07-14 8:32 ` Vlastimil Babka 2016-07-14 8:32 ` Vlastimil Babka 2016-07-18 5:07 ` Joonsoo Kim 2016-07-18 5:07 ` Joonsoo Kim 2016-07-18 6:51 ` Vlastimil Babka 2016-07-18 6:51 ` Vlastimil Babka 2016-07-18 7:24 ` Joonsoo Kim 2016-07-18 7:24 ` Joonsoo Kim 2016-07-14 9:05 ` Mel Gorman 2016-07-14 9:05 ` Mel Gorman 2016-07-18 5:03 ` Joonsoo Kim 2016-07-18 5:03 ` Joonsoo Kim 2016-07-01 20:01 ` [PATCH 09/31] mm, vmscan: by default have direct reclaim only shrink once per node Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-07 1:43 ` Joonsoo Kim 2016-07-07 1:43 ` Joonsoo Kim 2016-07-07 10:27 ` Mel Gorman 2016-07-07 10:27 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 10/31] mm, vmscan: remove duplicate logic clearing node congestion and dirty state Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 11/31] mm: vmscan: do not reclaim from kswapd if there is any eligible zone Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-05 6:11 ` Minchan Kim 2016-07-05 6:11 ` Minchan Kim 2016-07-05 10:38 ` Mel Gorman 2016-07-05 10:38 ` Mel Gorman 2016-07-06 1:25 ` Minchan Kim 2016-07-06 1:25 ` Minchan Kim 2016-07-06 8:42 ` Mel Gorman 2016-07-06 8:42 ` Mel Gorman 2016-07-07 6:27 ` Minchan Kim 2016-07-07 6:27 ` Minchan Kim 2016-07-07 10:55 ` Mel Gorman 2016-07-07 10:55 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 12/31] mm, vmscan: make shrink_node decisions more node-centric Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-05 6:24 ` Minchan Kim 2016-07-05 6:24 ` Minchan Kim 2016-07-05 10:40 ` Mel Gorman 2016-07-05 10:40 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 13/31] mm, memcg: move memcg limit enforcement from zones to nodes Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 14/31] mm, workingset: make working set detection node-aware Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 15/31] mm, page_alloc: consider dirtyable memory in terms of nodes Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 16/31] mm: move page mapped accounting to the node Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 17/31] mm: rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 18/31] mm: move most file-based accounting to the node Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 19/31] mm: move vmscan writes and file write " Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 20/31] mm, vmscan: only wakeup kswapd once per node for the requested classzone Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-07 1:24 ` Joonsoo Kim 2016-07-07 1:24 ` Joonsoo Kim 2016-07-07 10:58 ` Mel Gorman 2016-07-07 10:58 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 21/31] mm, page_alloc: Wake kswapd based on the highest eligible zone Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 22/31] mm: convert zone_reclaim to node_reclaim Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 23/31] mm, vmscan: Avoid passing in classzone_idx unnecessarily to shrink_node Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 24/31] mm, vmscan: Avoid passing in classzone_idx unnecessarily to compaction_ready Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 25/31] mm, vmscan: add classzone information to tracepoints Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 26/31] mm, page_alloc: remove fair zone allocation policy Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 27/31] mm: page_alloc: cache the last node whose dirty limit is reached Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 28/31] mm: vmstat: replace __count_zone_vm_events with a zone id equivalent Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 29/31] mm: vmstat: account per-zone stalls and pages skipped during reclaim Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 30/31] mm, vmstat: print node-based stats in zoneinfo file Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-01 20:01 ` [PATCH 31/31] mm, vmstat: Remove zone and node double accounting by approximating retries Mel Gorman 2016-07-01 20:01 ` Mel Gorman 2016-07-06 0:02 ` Minchan Kim 2016-07-06 0:02 ` Minchan Kim 2016-07-06 8:58 ` Mel Gorman 2016-07-06 8:58 ` Mel Gorman 2016-07-06 9:33 ` Mel Gorman 2016-07-06 9:33 ` Mel Gorman 2016-07-07 6:47 ` Minchan Kim 2016-07-07 6:47 ` Minchan Kim 2016-07-06 18:12 ` Dave Hansen 2016-07-06 18:12 ` Dave Hansen 2016-07-07 11:26 ` Mel Gorman 2016-07-07 11:26 ` Mel Gorman 2016-07-04 1:37 ` [PATCH 00/31] Move LRU page reclaim from zones to nodes v8 Minchan Kim 2016-07-04 1:37 ` Minchan Kim 2016-07-04 4:34 ` Mel Gorman 2016-07-04 4:34 ` Mel Gorman 2016-07-04 8:04 ` Minchan Kim 2016-07-04 8:04 ` Minchan Kim 2016-07-04 8:04 ` Minchan Kim 2016-07-04 9:55 ` Mel Gorman 2016-07-04 9:55 ` Mel Gorman 2016-07-06 1:51 ` Minchan Kim 2016-07-06 1:51 ` Minchan Kim -- strict thread matches above, loose matches on Subject: below -- 2016-07-01 15:37 Mel Gorman 2016-07-01 15:37 ` [PATCH 02/31] mm, vmscan: move lru_lock to the node Mel Gorman 2016-07-01 15:37 ` Mel Gorman
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