* [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
@ 2018-10-26 11:00 Arun KS
2018-10-26 11:00 ` [PATCH v1 1/4] mm: Fix multiple evaluvations of totalram_pages and managed_pages Arun KS
` (5 more replies)
0 siblings, 6 replies; 20+ messages in thread
From: Arun KS @ 2018-10-26 11:00 UTC (permalink / raw)
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
This series convert totalram_pages, totalhigh_pages and
zone->managed_pages to atomic variables.
The patch was comiple tested on x86(x86_64_defconfig & i386_defconfig)
on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
older version of kernel.
Arun KS (4):
mm: Fix multiple evaluvations of totalram_pages and managed_pages
mm: Convert zone->managed_pages to atomic variable
mm: convert totalram_pages and totalhigh_pages variables to atomic
mm: Remove managed_page_count spinlock
arch/csky/mm/init.c | 4 +-
arch/powerpc/platforms/pseries/cmm.c | 10 ++--
arch/s390/mm/init.c | 2 +-
arch/um/kernel/mem.c | 3 +-
arch/x86/kernel/cpu/microcode/core.c | 5 +-
drivers/char/agp/backend.c | 4 +-
drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
drivers/hv/hv_balloon.c | 19 +++----
drivers/md/dm-bufio.c | 2 +-
drivers/md/dm-crypt.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
drivers/md/dm-stats.c | 2 +-
drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
drivers/misc/vmw_balloon.c | 2 +-
drivers/parisc/ccio-dma.c | 4 +-
drivers/parisc/sba_iommu.c | 4 +-
drivers/staging/android/ion/ion_system_heap.c | 2 +-
drivers/xen/xen-selfballoon.c | 6 +--
fs/ceph/super.h | 2 +-
fs/file_table.c | 7 +--
fs/fuse/inode.c | 2 +-
fs/nfs/write.c | 2 +-
fs/nfsd/nfscache.c | 2 +-
fs/ntfs/malloc.h | 2 +-
fs/proc/base.c | 2 +-
include/linux/highmem.h | 28 ++++++++++-
include/linux/mm.h | 27 +++++++++-
include/linux/mmzone.h | 15 +++---
include/linux/swap.h | 1 -
kernel/fork.c | 5 +-
kernel/kexec_core.c | 5 +-
kernel/power/snapshot.c | 2 +-
lib/show_mem.c | 2 +-
mm/highmem.c | 4 +-
mm/huge_memory.c | 2 +-
mm/kasan/quarantine.c | 2 +-
mm/memblock.c | 6 +--
mm/memory_hotplug.c | 4 +-
mm/mm_init.c | 2 +-
mm/oom_kill.c | 2 +-
mm/page_alloc.c | 71 +++++++++++++--------------
mm/shmem.c | 7 +--
mm/slab.c | 2 +-
mm/swap.c | 2 +-
mm/util.c | 2 +-
mm/vmalloc.c | 4 +-
mm/vmstat.c | 4 +-
mm/workingset.c | 2 +-
mm/zswap.c | 4 +-
net/dccp/proto.c | 7 +--
net/decnet/dn_route.c | 2 +-
net/ipv4/tcp_metrics.c | 2 +-
net/netfilter/nf_conntrack_core.c | 7 +--
net/netfilter/xt_hashlimit.c | 5 +-
net/sctp/protocol.c | 7 +--
security/integrity/ima/ima_kexec.c | 2 +-
58 files changed, 195 insertions(+), 144 deletions(-)
--
1.9.1
^ permalink raw reply [flat|nested] 20+ messages in thread
* [PATCH v1 1/4] mm: Fix multiple evaluvations of totalram_pages and managed_pages
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
@ 2018-10-26 11:00 ` Arun KS
2018-10-26 11:01 ` [PATCH v1 2/4] mm: Convert zone->managed_pages to atomic variable Arun KS
` (4 subsequent siblings)
5 siblings, 0 replies; 20+ messages in thread
From: Arun KS @ 2018-10-26 11:00 UTC (permalink / raw)
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
This patch is in preparation to a later patch which converts totalram_pages
and zone->managed_pages to atomic variables. This patch does not introduce
any functional changes.
Signed-off-by: Arun KS <arunks@codeaurora.org>
---
arch/um/kernel/mem.c | 3 +--
arch/x86/kernel/cpu/microcode/core.c | 5 +++--
drivers/hv/hv_balloon.c | 19 ++++++++++---------
fs/file_table.c | 7 ++++---
kernel/fork.c | 5 +++--
kernel/kexec_core.c | 5 +++--
mm/page_alloc.c | 5 +++--
mm/shmem.c | 3 ++-
net/dccp/proto.c | 7 ++++---
net/netfilter/nf_conntrack_core.c | 7 ++++---
net/netfilter/xt_hashlimit.c | 5 +++--
net/sctp/protocol.c | 7 ++++---
12 files changed, 44 insertions(+), 34 deletions(-)
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 1067469..134d3fd 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -51,8 +51,7 @@ void __init mem_init(void)
/* this will put all low memory onto the freelists */
memblock_free_all();
- max_low_pfn = totalram_pages;
- max_pfn = totalram_pages;
+ max_pfn = max_low_pfn = totalram_pages;
mem_init_print_info(NULL);
kmalloc_ok = 1;
}
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 2637ff0..99c67ca 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -434,9 +434,10 @@ static ssize_t microcode_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
ssize_t ret = -EINVAL;
+ unsigned long totalram_pgs = totalram_pages;
- if ((len >> PAGE_SHIFT) > totalram_pages) {
- pr_err("too much data (max %ld pages)\n", totalram_pages);
+ if ((len >> PAGE_SHIFT) > totalram_pgs) {
+ pr_err("too much data (max %ld pages)\n", totalram_pgs);
return ret;
}
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index c5bc0b5..2a60f9a 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1092,6 +1092,7 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
static unsigned long compute_balloon_floor(void)
{
unsigned long min_pages;
+ unsigned long totalram_pgs = totalram_pages;
#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
/* Simple continuous piecewiese linear function:
* max MiB -> min MiB gradient
@@ -1104,16 +1105,16 @@ static unsigned long compute_balloon_floor(void)
* 8192 744 (1/16)
* 32768 1512 (1/32)
*/
- if (totalram_pages < MB2PAGES(128))
- min_pages = MB2PAGES(8) + (totalram_pages >> 1);
- else if (totalram_pages < MB2PAGES(512))
- min_pages = MB2PAGES(40) + (totalram_pages >> 2);
- else if (totalram_pages < MB2PAGES(2048))
- min_pages = MB2PAGES(104) + (totalram_pages >> 3);
- else if (totalram_pages < MB2PAGES(8192))
- min_pages = MB2PAGES(232) + (totalram_pages >> 4);
+ if (totalram_pgs < MB2PAGES(128))
+ min_pages = MB2PAGES(8) + (totalram_pgs >> 1);
+ else if (totalram_pgs < MB2PAGES(512))
+ min_pages = MB2PAGES(40) + (totalram_pgs >> 2);
+ else if (totalram_pgs < MB2PAGES(2048))
+ min_pages = MB2PAGES(104) + (totalram_pgs >> 3);
+ else if (totalram_pgs < MB2PAGES(8192))
+ min_pages = MB2PAGES(232) + (totalram_pgs >> 4);
else
- min_pages = MB2PAGES(488) + (totalram_pages >> 5);
+ min_pages = MB2PAGES(488) + (totalram_pgs >> 5);
#undef MB2PAGES
return min_pages;
}
diff --git a/fs/file_table.c b/fs/file_table.c
index e03c8d1..5d36655 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -383,10 +383,11 @@ void __init files_init(void)
void __init files_maxfiles_init(void)
{
unsigned long n;
- unsigned long memreserve = (totalram_pages - nr_free_pages()) * 3/2;
+ unsigned long totalram_pgs = totalram_pages;
+ unsigned long memreserve = (totalram_pgs - nr_free_pages()) * 3/2;
- memreserve = min(memreserve, totalram_pages - 1);
- n = ((totalram_pages - memreserve) * (PAGE_SIZE / 1024)) / 10;
+ memreserve = min(memreserve, totalram_pgs - 1);
+ n = ((totalram_pgs - memreserve) * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
}
diff --git a/kernel/fork.c b/kernel/fork.c
index 2f78d32..63d57f7 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -739,15 +739,16 @@ void __init __weak arch_task_cache_init(void) { }
static void set_max_threads(unsigned int max_threads_suggested)
{
u64 threads;
+ unsigned long totalram_pgs = totalram_pages;
/*
* The number of threads shall be limited such that the thread
* structures may only consume a small part of the available memory.
*/
- if (fls64(totalram_pages) + fls64(PAGE_SIZE) > 64)
+ if (fls64(totalram_pgs) + fls64(PAGE_SIZE) > 64)
threads = MAX_THREADS;
else
- threads = div64_u64((u64) totalram_pages * (u64) PAGE_SIZE,
+ threads = div64_u64((u64) totalram_pgs * (u64) PAGE_SIZE,
(u64) THREAD_SIZE * 8UL);
if (threads > max_threads_suggested)
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 86ef06d..dff217c 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -152,6 +152,7 @@ int sanity_check_segment_list(struct kimage *image)
int i;
unsigned long nr_segments = image->nr_segments;
unsigned long total_pages = 0;
+ unsigned long totalram_pgs = totalram_pages;
/*
* Verify we have good destination addresses. The caller is
@@ -217,13 +218,13 @@ int sanity_check_segment_list(struct kimage *image)
* wasted allocating pages, which can cause a soft lockup.
*/
for (i = 0; i < nr_segments; i++) {
- if (PAGE_COUNT(image->segment[i].memsz) > totalram_pages / 2)
+ if (PAGE_COUNT(image->segment[i].memsz) > totalram_pgs / 2)
return -EINVAL;
total_pages += PAGE_COUNT(image->segment[i].memsz);
}
- if (total_pages > totalram_pages / 2)
+ if (total_pages > totalram_pgs / 2)
return -EINVAL;
/*
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4bd858d..f045191 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7243,6 +7243,7 @@ static void calculate_totalreserve_pages(void)
for (i = 0; i < MAX_NR_ZONES; i++) {
struct zone *zone = pgdat->node_zones + i;
long max = 0;
+ unsigned long managed_pages = zone->managed_pages;
/* Find valid and maximum lowmem_reserve in the zone */
for (j = i; j < MAX_NR_ZONES; j++) {
@@ -7253,8 +7254,8 @@ static void calculate_totalreserve_pages(void)
/* we treat the high watermark as reserved pages. */
max += high_wmark_pages(zone);
- if (max > zone->managed_pages)
- max = zone->managed_pages;
+ if (max > managed_pages)
+ max = managed_pages;
pgdat->totalreserve_pages += max;
diff --git a/mm/shmem.c b/mm/shmem.c
index a6964ba..6556e86 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -114,7 +114,8 @@ static unsigned long shmem_default_max_blocks(void)
static unsigned long shmem_default_max_inodes(void)
{
- return min(totalram_pages - totalhigh_pages, totalram_pages / 2);
+ unsigned long totalram_pgs = totalram_pages;
+ return min(totalram_pgs - totalhigh_pages, totalram_pgs / 2);
}
#endif
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 875858c..0cef31e 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -1131,6 +1131,7 @@ static inline void dccp_mib_exit(void)
static int __init dccp_init(void)
{
unsigned long goal;
+ unsigned long totalram_pgs = totalram_pages;
int ehash_order, bhash_order, i;
int rc;
@@ -1154,10 +1155,10 @@ static int __init dccp_init(void)
*
* The methodology is similar to that of the buffer cache.
*/
- if (totalram_pages >= (128 * 1024))
- goal = totalram_pages >> (21 - PAGE_SHIFT);
+ if (totalram_pgs >= (128 * 1024))
+ goal = totalram_pgs >> (21 - PAGE_SHIFT);
else
- goal = totalram_pages >> (23 - PAGE_SHIFT);
+ goal = totalram_pgs >> (23 - PAGE_SHIFT);
if (thash_entries)
goal = (thash_entries *
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index ca1168d..0b1801e 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -2248,6 +2248,7 @@ static __always_inline unsigned int total_extension_size(void)
int nf_conntrack_init_start(void)
{
+ unsigned long totalram_pgs = totalram_pages;
int max_factor = 8;
int ret = -ENOMEM;
int i;
@@ -2267,11 +2268,11 @@ int nf_conntrack_init_start(void)
* >= 4GB machines have 65536 buckets.
*/
nf_conntrack_htable_size
- = (((totalram_pages << PAGE_SHIFT) / 16384)
+ = (((totalram_pgs << PAGE_SHIFT) / 16384)
/ sizeof(struct hlist_head));
- if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE)))
+ if (totalram_pgs > (4 * (1024 * 1024 * 1024 / PAGE_SIZE)))
nf_conntrack_htable_size = 65536;
- else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE))
+ else if (totalram_pgs > (1024 * 1024 * 1024 / PAGE_SIZE))
nf_conntrack_htable_size = 16384;
if (nf_conntrack_htable_size < 32)
nf_conntrack_htable_size = 32;
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 3e7d259..6cb9a74 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -274,14 +274,15 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg,
struct xt_hashlimit_htable *hinfo;
const struct seq_operations *ops;
unsigned int size, i;
+ unsigned long totalram_pgs = totalram_pages;
int ret;
if (cfg->size) {
size = cfg->size;
} else {
- size = (totalram_pages << PAGE_SHIFT) / 16384 /
+ size = (totalram_pgs << PAGE_SHIFT) / 16384 /
sizeof(struct hlist_head);
- if (totalram_pages > 1024 * 1024 * 1024 / PAGE_SIZE)
+ if (totalram_pgs > 1024 * 1024 * 1024 / PAGE_SIZE)
size = 8192;
if (size < 16)
size = 16;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 9b277bd..7128f85 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1368,6 +1368,7 @@ static __init int sctp_init(void)
int status = -EINVAL;
unsigned long goal;
unsigned long limit;
+ unsigned long totalram_pages;
int max_share;
int order;
int num_entries;
@@ -1426,10 +1427,10 @@ static __init int sctp_init(void)
* The methodology is similar to that of the tcp hash tables.
* Though not identical. Start by getting a goal size
*/
- if (totalram_pages >= (128 * 1024))
- goal = totalram_pages >> (22 - PAGE_SHIFT);
+ if (totalram_pgs >= (128 * 1024))
+ goal = totalram_pgs >> (22 - PAGE_SHIFT);
else
- goal = totalram_pages >> (24 - PAGE_SHIFT);
+ goal = totalram_pgs >> (24 - PAGE_SHIFT);
/* Then compute the page order for said goal */
order = get_order(goal);
--
1.9.1
^ permalink raw reply related [flat|nested] 20+ messages in thread
* [PATCH v1 2/4] mm: Convert zone->managed_pages to atomic variable
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-10-26 11:00 ` [PATCH v1 1/4] mm: Fix multiple evaluvations of totalram_pages and managed_pages Arun KS
@ 2018-10-26 11:01 ` Arun KS
2018-10-26 11:01 ` [PATCH v1 3/4] mm: convert totalram_pages and totalhigh_pages variables to atomic Arun KS
` (3 subsequent siblings)
5 siblings, 0 replies; 20+ messages in thread
From: Arun KS @ 2018-10-26 11:01 UTC (permalink / raw)
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
managed_page_count_lock will be removed in subsequent patch after
totalram_pages and totalhigh_pages are converted to atomic.
Suggested-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Arun KS <arunks@codeaurora.org>
---
Most of the changes are done by below coccinelle script,
@@
struct zone *z;
expression e1;
@@
(
- z->managed_pages = e1
+ atomic_long_set(&z->managed_pages, e1)
|
- e1->managed_pages++
+ atomic_long_inc(&e1->managed_pages)
|
- z->managed_pages
+ zone_managed_pages(z)
)
@@
expression e,e1;
@@
- e->managed_pages += e1
+ atomic_long_add(e1, &e->managed_pages)
@@
expression z;
@@
- z.managed_pages
+ zone_managed_pages(&z)
Then, manually apply following change,
include/linux/mmzone.h
- unsigned long managed_pages;
+ atomic_long_t managed_pages;
+static inline unsigned long zone_managed_pages(struct zone *zone)
+{
+ return (unsigned long)atomic_long_read(&zone->managed_pages);
+}
---
drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
include/linux/mmzone.h | 9 +++++--
lib/show_mem.c | 2 +-
mm/memblock.c | 2 +-
mm/page_alloc.c | 44 +++++++++++++++++------------------
mm/vmstat.c | 4 ++--
6 files changed, 34 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index 56412b0..c0e55bb 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -848,7 +848,7 @@ static int kfd_fill_mem_info_for_cpu(int numa_node_id, int *avail_size,
*/
pgdat = NODE_DATA(numa_node_id);
for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
- mem_in_bytes += pgdat->node_zones[zone_type].managed_pages;
+ mem_in_bytes += zone_managed_pages(&pgdat->node_zones[zone_type]);
mem_in_bytes <<= PAGE_SHIFT;
sub_type_hdr->length_low = lower_32_bits(mem_in_bytes);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 8555509..597b0c7 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -435,7 +435,7 @@ struct zone {
* adjust_managed_page_count() should be used instead of directly
* touching zone->managed_pages and totalram_pages.
*/
- unsigned long managed_pages;
+ atomic_long_t managed_pages;
unsigned long spanned_pages;
unsigned long present_pages;
@@ -524,6 +524,11 @@ enum pgdat_flags {
PGDAT_RECLAIM_LOCKED, /* prevents concurrent reclaim */
};
+static inline unsigned long zone_managed_pages(struct zone *zone)
+{
+ return (unsigned long)atomic_long_read(&zone->managed_pages);
+}
+
static inline unsigned long zone_end_pfn(const struct zone *zone)
{
return zone->zone_start_pfn + zone->spanned_pages;
@@ -814,7 +819,7 @@ static inline bool is_dev_zone(const struct zone *zone)
*/
static inline bool managed_zone(struct zone *zone)
{
- return zone->managed_pages;
+ return zone_managed_pages(zone);
}
/* Returns true if a zone has memory */
diff --git a/lib/show_mem.c b/lib/show_mem.c
index 0beaa1d..eefe67d 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -28,7 +28,7 @@ void show_mem(unsigned int filter, nodemask_t *nodemask)
continue;
total += zone->present_pages;
- reserved += zone->present_pages - zone->managed_pages;
+ reserved += zone->present_pages - zone_managed_pages(zone);
if (is_highmem_idx(zoneid))
highmem += zone->present_pages;
diff --git a/mm/memblock.c b/mm/memblock.c
index eddcac2..14a6219 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -2001,7 +2001,7 @@ void reset_node_managed_pages(pg_data_t *pgdat)
struct zone *z;
for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
- z->managed_pages = 0;
+ atomic_long_set(&z->managed_pages, 0);
}
void __init reset_all_zones_managed_pages(void)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f045191..f077849 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1275,7 +1275,7 @@ void __free_pages_core(struct page *page, unsigned int order)
set_page_count(p, 0);
}
- page_zone(page)->managed_pages += nr_pages;
+ atomic_long_add(nr_pages, &page_zone(page)->managed_pages);
set_page_refcounted(page);
__free_pages(page, order);
}
@@ -2254,7 +2254,7 @@ static void reserve_highatomic_pageblock(struct page *page, struct zone *zone,
* Limit the number reserved to 1 pageblock or roughly 1% of a zone.
* Check is race-prone but harmless.
*/
- max_managed = (zone->managed_pages / 100) + pageblock_nr_pages;
+ max_managed = (zone_managed_pages(zone) / 100) + pageblock_nr_pages;
if (zone->nr_reserved_highatomic >= max_managed)
return;
@@ -4658,7 +4658,7 @@ static unsigned long nr_free_zone_pages(int offset)
struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL);
for_each_zone_zonelist(zone, z, zonelist, offset) {
- unsigned long size = zone->managed_pages;
+ unsigned long size = zone_managed_pages(zone);
unsigned long high = high_wmark_pages(zone);
if (size > high)
sum += size - high;
@@ -4765,7 +4765,7 @@ void si_meminfo_node(struct sysinfo *val, int nid)
pg_data_t *pgdat = NODE_DATA(nid);
for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
- managed_pages += pgdat->node_zones[zone_type].managed_pages;
+ managed_pages += zone_managed_pages(&pgdat->node_zones[zone_type]);
val->totalram = managed_pages;
val->sharedram = node_page_state(pgdat, NR_SHMEM);
val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES);
@@ -4774,7 +4774,7 @@ void si_meminfo_node(struct sysinfo *val, int nid)
struct zone *zone = &pgdat->node_zones[zone_type];
if (is_highmem(zone)) {
- managed_highpages += zone->managed_pages;
+ managed_highpages += zone_managed_pages(zone);
free_highpages += zone_page_state(zone, NR_FREE_PAGES);
}
}
@@ -4981,7 +4981,7 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)),
K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)),
K(zone->present_pages),
- K(zone->managed_pages),
+ K(zone_managed_pages(zone)),
K(zone_page_state(zone, NR_MLOCK)),
zone_page_state(zone, NR_KERNEL_STACK_KB),
K(zone_page_state(zone, NR_PAGETABLE)),
@@ -5643,7 +5643,7 @@ static int zone_batchsize(struct zone *zone)
* The per-cpu-pages pools are set to around 1000th of the
* size of the zone.
*/
- batch = zone->managed_pages / 1024;
+ batch = zone_managed_pages(zone) / 1024;
/* But no more than a meg. */
if (batch * PAGE_SIZE > 1024 * 1024)
batch = (1024 * 1024) / PAGE_SIZE;
@@ -5754,7 +5754,7 @@ static void pageset_set_high_and_batch(struct zone *zone,
{
if (percpu_pagelist_fraction)
pageset_set_high(pcp,
- (zone->managed_pages /
+ (zone_managed_pages(zone) /
percpu_pagelist_fraction));
else
pageset_set_batch(pcp, zone_batchsize(zone));
@@ -6309,7 +6309,7 @@ static void __meminit pgdat_init_internals(struct pglist_data *pgdat)
static void __meminit zone_init_internals(struct zone *zone, enum zone_type idx, int nid,
unsigned long remaining_pages)
{
- zone->managed_pages = remaining_pages;
+ atomic_long_set(&zone->managed_pages, remaining_pages);
zone_set_nid(zone, nid);
zone->name = zone_names[idx];
zone->zone_pgdat = NODE_DATA(nid);
@@ -7062,7 +7062,7 @@ static int __init cmdline_parse_movablecore(char *p)
void adjust_managed_page_count(struct page *page, long count)
{
spin_lock(&managed_page_count_lock);
- page_zone(page)->managed_pages += count;
+ atomic_long_add(count, &page_zone(page)->managed_pages);
totalram_pages += count;
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
@@ -7110,7 +7110,7 @@ void free_highmem_page(struct page *page)
{
__free_reserved_page(page);
totalram_pages++;
- page_zone(page)->managed_pages++;
+ atomic_long_inc(&page_zone(page)->managed_pages);
totalhigh_pages++;
}
#endif
@@ -7243,7 +7243,7 @@ static void calculate_totalreserve_pages(void)
for (i = 0; i < MAX_NR_ZONES; i++) {
struct zone *zone = pgdat->node_zones + i;
long max = 0;
- unsigned long managed_pages = zone->managed_pages;
+ unsigned long managed_pages = zone_managed_pages(zone);
/* Find valid and maximum lowmem_reserve in the zone */
for (j = i; j < MAX_NR_ZONES; j++) {
@@ -7279,7 +7279,7 @@ static void setup_per_zone_lowmem_reserve(void)
for_each_online_pgdat(pgdat) {
for (j = 0; j < MAX_NR_ZONES; j++) {
struct zone *zone = pgdat->node_zones + j;
- unsigned long managed_pages = zone->managed_pages;
+ unsigned long managed_pages = zone_managed_pages(zone);
zone->lowmem_reserve[j] = 0;
@@ -7297,7 +7297,7 @@ static void setup_per_zone_lowmem_reserve(void)
lower_zone->lowmem_reserve[j] =
managed_pages / sysctl_lowmem_reserve_ratio[idx];
}
- managed_pages += lower_zone->managed_pages;
+ managed_pages += zone_managed_pages(lower_zone);
}
}
}
@@ -7316,14 +7316,14 @@ static void __setup_per_zone_wmarks(void)
/* Calculate total number of !ZONE_HIGHMEM pages */
for_each_zone(zone) {
if (!is_highmem(zone))
- lowmem_pages += zone->managed_pages;
+ lowmem_pages += zone_managed_pages(zone);
}
for_each_zone(zone) {
u64 tmp;
spin_lock_irqsave(&zone->lock, flags);
- tmp = (u64)pages_min * zone->managed_pages;
+ tmp = (u64)pages_min * zone_managed_pages(zone);
do_div(tmp, lowmem_pages);
if (is_highmem(zone)) {
/*
@@ -7337,7 +7337,7 @@ static void __setup_per_zone_wmarks(void)
*/
unsigned long min_pages;
- min_pages = zone->managed_pages / 1024;
+ min_pages = zone_managed_pages(zone) / 1024;
min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL);
zone->watermark[WMARK_MIN] = min_pages;
} else {
@@ -7354,7 +7354,7 @@ static void __setup_per_zone_wmarks(void)
* ensure a minimum size on small systems.
*/
tmp = max_t(u64, tmp >> 2,
- mult_frac(zone->managed_pages,
+ mult_frac(zone_managed_pages(zone),
watermark_scale_factor, 10000));
zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp;
@@ -7484,8 +7484,8 @@ static void setup_min_unmapped_ratio(void)
pgdat->min_unmapped_pages = 0;
for_each_zone(zone)
- zone->zone_pgdat->min_unmapped_pages += (zone->managed_pages *
- sysctl_min_unmapped_ratio) / 100;
+ zone->zone_pgdat->min_unmapped_pages += (zone_managed_pages(zone) *
+ sysctl_min_unmapped_ratio) / 100;
}
@@ -7512,8 +7512,8 @@ static void setup_min_slab_ratio(void)
pgdat->min_slab_pages = 0;
for_each_zone(zone)
- zone->zone_pgdat->min_slab_pages += (zone->managed_pages *
- sysctl_min_slab_ratio) / 100;
+ zone->zone_pgdat->min_slab_pages += (zone_managed_pages(zone) *
+ sysctl_min_slab_ratio) / 100;
}
int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 6038ce5..9fee037 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -227,7 +227,7 @@ int calculate_normal_threshold(struct zone *zone)
* 125 1024 10 16-32 GB 9
*/
- mem = zone->managed_pages >> (27 - PAGE_SHIFT);
+ mem = zone_managed_pages(zone) >> (27 - PAGE_SHIFT);
threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem));
@@ -1569,7 +1569,7 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
high_wmark_pages(zone),
zone->spanned_pages,
zone->present_pages,
- zone->managed_pages);
+ zone_managed_pages(zone));
seq_printf(m,
"\n protection: (%ld",
--
1.9.1
^ permalink raw reply related [flat|nested] 20+ messages in thread
* [PATCH v1 3/4] mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-10-26 11:00 ` [PATCH v1 1/4] mm: Fix multiple evaluvations of totalram_pages and managed_pages Arun KS
2018-10-26 11:01 ` [PATCH v1 2/4] mm: Convert zone->managed_pages to atomic variable Arun KS
@ 2018-10-26 11:01 ` Arun KS
[not found] ` <20181106141438.GQ27423@dhcp22.suse.cz>
2018-10-26 11:01 ` [PATCH v1 4/4] mm: Remove managed_page_count spinlock Arun KS
` (2 subsequent siblings)
5 siblings, 1 reply; 20+ messages in thread
From: Arun KS @ 2018-10-26 11:01 UTC (permalink / raw)
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
totalram_pages and totalhigh_pages are made static inline function.
Suggested-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Arun KS <arunks@codeaurora.org>
---
coccinelle script to make most of the changes,
@@
declarer name EXPORT_SYMBOL;
symbol totalram_pages;
expression e;
@@
(
EXPORT_SYMBOL(totalram_pages);
|
- totalram_pages = e
+ totalram_pages_set(e)
|
- totalram_pages += e
+ totalram_pages_add(e)
|
- totalram_pages++
+ totalram_pages_inc()
|
- totalram_pages--
+ totalram_pages_dec()
|
- totalram_pages
+ totalram_pages()
)
@@
symbol totalhigh_pages;
expression e;
@@
(
EXPORT_SYMBOL(totalhigh_pages);
|
- totalhigh_pages = e
+ totalhigh_pages_set(e)
|
- totalhigh_pages += e
+ totalhigh_pages_add(e)
|
- totalhigh_pages++
+ totalhigh_pages_inc()
|
- totalhigh_pages--
+ totalhigh_pages_dec()
|
- totalhigh_pages
+ totalhigh_pages()
)
Manaually apply all changes of following files,
include/linux/highmem.h
include/linux/mm.h
include/linux/swap.h
mm/highmem.c
and for mm/page_alloc.c mannualy apply only below changes,
#include <linux/stddef.h>
#include <linux/mm.h>
+#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
/* Protect totalram_pages and zone->managed_pages */
static DEFINE_SPINLOCK(managed_page_count_lock);
-unsigned long totalram_pages __read_mostly;
+atomic_long_t _totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long totalcma_pages __read_mostly;
---
arch/csky/mm/init.c | 4 ++--
arch/powerpc/platforms/pseries/cmm.c | 10 +++++-----
arch/s390/mm/init.c | 2 +-
arch/um/kernel/mem.c | 2 +-
arch/x86/kernel/cpu/microcode/core.c | 2 +-
drivers/char/agp/backend.c | 4 ++--
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 ++--
drivers/hv/hv_balloon.c | 2 +-
drivers/md/dm-bufio.c | 2 +-
drivers/md/dm-crypt.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
drivers/md/dm-stats.c | 2 +-
drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
drivers/misc/vmw_balloon.c | 2 +-
drivers/parisc/ccio-dma.c | 4 ++--
drivers/parisc/sba_iommu.c | 4 ++--
drivers/staging/android/ion/ion_system_heap.c | 2 +-
drivers/xen/xen-selfballoon.c | 6 +++---
fs/ceph/super.h | 2 +-
fs/file_table.c | 2 +-
fs/fuse/inode.c | 2 +-
fs/nfs/write.c | 2 +-
fs/nfsd/nfscache.c | 2 +-
fs/ntfs/malloc.h | 2 +-
fs/proc/base.c | 2 +-
include/linux/highmem.h | 28 +++++++++++++++++++++++++--
include/linux/mm.h | 27 +++++++++++++++++++++++++-
include/linux/swap.h | 1 -
kernel/fork.c | 2 +-
kernel/kexec_core.c | 2 +-
kernel/power/snapshot.c | 2 +-
mm/highmem.c | 4 +---
mm/huge_memory.c | 2 +-
mm/kasan/quarantine.c | 2 +-
mm/memblock.c | 4 ++--
mm/memory_hotplug.c | 4 ++--
mm/mm_init.c | 2 +-
mm/oom_kill.c | 2 +-
mm/page_alloc.c | 19 +++++++++---------
mm/shmem.c | 8 ++++----
mm/slab.c | 2 +-
mm/swap.c | 2 +-
mm/util.c | 2 +-
mm/vmalloc.c | 4 ++--
mm/workingset.c | 2 +-
mm/zswap.c | 4 ++--
net/dccp/proto.c | 2 +-
net/decnet/dn_route.c | 2 +-
net/ipv4/tcp_metrics.c | 2 +-
net/netfilter/nf_conntrack_core.c | 2 +-
net/netfilter/xt_hashlimit.c | 2 +-
security/integrity/ima/ima_kexec.c | 2 +-
53 files changed, 129 insertions(+), 82 deletions(-)
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
index dc07c07..66e5970 100644
--- a/arch/csky/mm/init.c
+++ b/arch/csky/mm/init.c
@@ -71,7 +71,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
ClearPageReserved(virt_to_page(start));
init_page_count(virt_to_page(start));
free_page(start);
- totalram_pages++;
+ totalram_pages_inc();
}
}
#endif
@@ -88,7 +88,7 @@ void free_initmem(void)
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
- totalram_pages++;
+ totalram_pages_inc();
addr += PAGE_SIZE;
}
diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
index 25427a4..e8d63a6 100644
--- a/arch/powerpc/platforms/pseries/cmm.c
+++ b/arch/powerpc/platforms/pseries/cmm.c
@@ -208,7 +208,7 @@ static long cmm_alloc_pages(long nr)
pa->page[pa->index++] = addr;
loaned_pages++;
- totalram_pages--;
+ totalram_pages_dec();
spin_unlock(&cmm_lock);
nr--;
}
@@ -247,7 +247,7 @@ static long cmm_free_pages(long nr)
free_page(addr);
loaned_pages--;
nr--;
- totalram_pages++;
+ totalram_pages_inc();
}
spin_unlock(&cmm_lock);
cmm_dbg("End request with %ld pages unfulfilled\n", nr);
@@ -291,7 +291,7 @@ static void cmm_get_mpp(void)
int rc;
struct hvcall_mpp_data mpp_data;
signed long active_pages_target, page_loan_request, target;
- signed long total_pages = totalram_pages + loaned_pages;
+ signed long total_pages = totalram_pages() + loaned_pages;
signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE;
rc = h_get_mpp(&mpp_data);
@@ -322,7 +322,7 @@ static void cmm_get_mpp(void)
cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = %lu\n",
page_loan_request, loaned_pages, loaned_pages_target,
- oom_freed_pages, totalram_pages);
+ oom_freed_pages, totalram_pages());
}
static struct notifier_block cmm_oom_nb = {
@@ -581,7 +581,7 @@ static int cmm_mem_going_offline(void *arg)
free_page(pa_curr->page[idx]);
freed++;
loaned_pages--;
- totalram_pages++;
+ totalram_pages_inc();
pa_curr->page[idx] = pa_last->page[--pa_last->index];
if (pa_last->index == 0) {
if (pa_curr == pa_last)
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 76d0708..5038819 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -59,7 +59,7 @@ static void __init setup_zero_pages(void)
order = 7;
/* Limit number of empty zero pages for small memory sizes */
- while (order > 2 && (totalram_pages >> 10) < (1UL << order))
+ while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
order--;
empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 134d3fd..64b62a8 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -51,7 +51,7 @@ void __init mem_init(void)
/* this will put all low memory onto the freelists */
memblock_free_all();
- max_pfn = max_low_pfn = totalram_pages;
+ max_pfn = max_low_pfn = totalram_pages();
mem_init_print_info(NULL);
kmalloc_ok = 1;
}
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 99c67ca..8594641 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -434,7 +434,7 @@ static ssize_t microcode_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
ssize_t ret = -EINVAL;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
if ((len >> PAGE_SHIFT) > totalram_pgs) {
pr_err("too much data (max %ld pages)\n", totalram_pgs);
diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index 38ffb28..004a3ce 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -115,9 +115,9 @@ static int agp_find_max(void)
long memory, index, result;
#if PAGE_SHIFT < 20
- memory = totalram_pages >> (20 - PAGE_SHIFT);
+ memory = totalram_pages() >> (20 - PAGE_SHIFT);
#else
- memory = totalram_pages << (PAGE_SHIFT - 20);
+ memory = totalram_pages() << (PAGE_SHIFT - 20);
#endif
index = 1;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0c8aa57..6ed0e75 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2539,7 +2539,7 @@ static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
* If there's no chance of allocating enough pages for the whole
* object, bail early.
*/
- if (page_count > totalram_pages)
+ if (page_count > totalram_pages())
return -ENOMEM;
st = kmalloc(sizeof(*st), GFP_KERNEL);
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 8e2e269..91a8fa4 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -170,7 +170,7 @@ static int igt_ppgtt_alloc(void *arg)
* This should ensure that we do not run into the oomkiller during
* the test and take down the machine wilfully.
*/
- limit = totalram_pages << PAGE_SHIFT;
+ limit = totalram_pages() << PAGE_SHIFT;
limit = min(ppgtt->vm.total, limit);
/* Check we can allocate the entire range */
@@ -1244,7 +1244,7 @@ static int exercise_mock(struct drm_i915_private *i915,
u64 hole_start, u64 hole_end,
unsigned long end_time))
{
- const u64 limit = totalram_pages << PAGE_SHIFT;
+ const u64 limit = totalram_pages() << PAGE_SHIFT;
struct i915_gem_context *ctx;
struct i915_hw_ppgtt *ppgtt;
IGT_TIMEOUT(end_time);
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 2a60f9a..94b3d66 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1092,7 +1092,7 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
static unsigned long compute_balloon_floor(void)
{
unsigned long min_pages;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
/* Simple continuous piecewiese linear function:
* max MiB -> min MiB gradient
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index dc385b7..8b0b628 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1887,7 +1887,7 @@ static int __init dm_bufio_init(void)
dm_bufio_allocated_vmalloc = 0;
dm_bufio_current_allocated = 0;
- mem = (__u64)mult_frac(totalram_pages - totalhigh_pages,
+ mem = (__u64)mult_frac(totalram_pages() - totalhigh_pages(),
DM_BUFIO_MEMORY_PERCENT, 100) << PAGE_SHIFT;
if (mem > ULONG_MAX)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 0481223..62f2e92 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2158,7 +2158,7 @@ static int crypt_wipe_key(struct crypt_config *cc)
static void crypt_calculate_pages_per_client(void)
{
- unsigned long pages = (totalram_pages - totalhigh_pages) * DM_CRYPT_MEMORY_PERCENT / 100;
+ unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
if (!dm_crypt_clients_n)
return;
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index bb3096b..c12fa01 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -2843,7 +2843,7 @@ static int create_journal(struct dm_integrity_c *ic, char **error)
journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
journal_desc_size = journal_pages * sizeof(struct page_list);
- if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) {
+ if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
*error = "Journal doesn't fit into memory";
r = -ENOMEM;
goto bad;
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index 21de30b..45b92a3 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -85,7 +85,7 @@ static bool __check_shared_memory(size_t alloc_size)
a = shared_memory_amount + alloc_size;
if (a < shared_memory_amount)
return false;
- if (a >> PAGE_SHIFT > totalram_pages / DM_STATS_MEMORY_FACTOR)
+ if (a >> PAGE_SHIFT > totalram_pages() / DM_STATS_MEMORY_FACTOR)
return false;
#ifdef CONFIG_MMU
if (a > (VMALLOC_END - VMALLOC_START) / DM_STATS_VMALLOC_FACTOR)
diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c
index 616f78b..b660249 100644
--- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
+++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
@@ -855,7 +855,7 @@ static int mtk_vpu_probe(struct platform_device *pdev)
/* Set PTCM to 96K and DTCM to 32K */
vpu_cfg_writel(vpu, 0x2, VPU_TCM_CFG);
- vpu->enable_4GB = !!(totalram_pages > (SZ_2G >> PAGE_SHIFT));
+ vpu->enable_4GB = !!(totalram_pages() > (SZ_2G >> PAGE_SHIFT));
dev_info(dev, "4GB mode %u\n", vpu->enable_4GB);
if (vpu->enable_4GB) {
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 9b0b3fa..e6126a4 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -570,7 +570,7 @@ static int vmballoon_send_get_target(struct vmballoon *b)
unsigned long status;
unsigned long limit;
- limit = totalram_pages;
+ limit = totalram_pages();
/* Ensure limit fits in 32-bits */
if (limit != (u32)limit)
diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index 6148236..067cbaf 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -1255,7 +1255,7 @@ void __init ccio_cujo20_fixup(struct parisc_device *cujo, u32 iovp)
** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
*/
- iova_space_size = (u32) (totalram_pages / count_parisc_driver(&ccio_driver));
+ iova_space_size = (u32) (totalram_pages() / count_parisc_driver(&ccio_driver));
/* limit IOVA space size to 1MB-1GB */
@@ -1294,7 +1294,7 @@ void __init ccio_cujo20_fixup(struct parisc_device *cujo, u32 iovp)
DBG_INIT("%s() hpa 0x%p mem %luMB IOV %dMB (%d bits)\n",
__func__, ioc->ioc_regs,
- (unsigned long) totalram_pages >> (20 - PAGE_SHIFT),
+ (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
iova_space_size>>20,
iov_order + PAGE_SHIFT);
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index 11de0ec..b61ae31 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -1419,7 +1419,7 @@ static int setup_ibase_imask_callback(struct device *dev, void *data)
** for DMA hints - ergo only 30 bits max.
*/
- iova_space_size = (u32) (totalram_pages/global_ioc_cnt);
+ iova_space_size = (u32) (totalram_pages()/global_ioc_cnt);
/* limit IOVA space size to 1MB-1GB */
if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
@@ -1444,7 +1444,7 @@ static int setup_ibase_imask_callback(struct device *dev, void *data)
DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
__func__,
ioc->ioc_hpa,
- (unsigned long) totalram_pages >> (20 - PAGE_SHIFT),
+ (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
iova_space_size>>20,
iov_order + PAGE_SHIFT);
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index 548bb02..6cb0eeb 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -110,7 +110,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
unsigned long size_remaining = PAGE_ALIGN(size);
unsigned int max_order = orders[0];
- if (size / PAGE_SIZE > totalram_pages / 2)
+ if (size / PAGE_SIZE > totalram_pages() / 2)
return -ENOMEM;
INIT_LIST_HEAD(&pages);
diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index 5165aa8..246f612 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -189,7 +189,7 @@ static void selfballoon_process(struct work_struct *work)
bool reset_timer = false;
if (xen_selfballooning_enabled) {
- cur_pages = totalram_pages;
+ cur_pages = totalram_pages();
tgt_pages = cur_pages; /* default is no change */
goal_pages = vm_memory_committed() +
totalreserve_pages +
@@ -227,7 +227,7 @@ static void selfballoon_process(struct work_struct *work)
if (tgt_pages < floor_pages)
tgt_pages = floor_pages;
balloon_set_new_target(tgt_pages +
- balloon_stats.current_pages - totalram_pages);
+ balloon_stats.current_pages - totalram_pages());
reset_timer = true;
}
#ifdef CONFIG_FRONTSWAP
@@ -569,7 +569,7 @@ int xen_selfballoon_init(bool use_selfballooning, bool use_frontswap_selfshrink)
* much more reliably and response faster in some cases.
*/
if (!selfballoon_reserved_mb) {
- reserve_pages = totalram_pages / 10;
+ reserve_pages = totalram_pages() / 10;
selfballoon_reserved_mb = PAGES2MB(reserve_pages);
}
schedule_delayed_work(&selfballoon_worker, selfballoon_interval * HZ);
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 582e28f..5d6659c 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -807,7 +807,7 @@ static inline int default_congestion_kb(void)
* This allows larger machines to have larger/more transfers.
* Limit the default to 256M
*/
- congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
+ congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10);
if (congestion_kb > 256*1024)
congestion_kb = 256*1024;
diff --git a/fs/file_table.c b/fs/file_table.c
index 5d36655..ec1633b 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -383,7 +383,7 @@ void __init files_init(void)
void __init files_maxfiles_init(void)
{
unsigned long n;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
unsigned long memreserve = (totalram_pgs - nr_free_pages()) * 3/2;
memreserve = min(memreserve, totalram_pgs - 1);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 4727ef6..f0fe74f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -825,7 +825,7 @@ static struct dentry *fuse_get_parent(struct dentry *child)
static void sanitize_global_limit(unsigned *limit)
{
if (*limit == 0)
- *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
+ *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) /
sizeof(struct fuse_req);
if (*limit >= 1 << 16)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 586726a..4f15665 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -2121,7 +2121,7 @@ int __init nfs_init_writepagecache(void)
* This allows larger machines to have larger/more transfers.
* Limit the default to 256M
*/
- nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
+ nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10);
if (nfs_congestion_kb > 256*1024)
nfs_congestion_kb = 256*1024;
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index e2fe0e9..da52b59 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -99,7 +99,7 @@ static unsigned long nfsd_reply_cache_scan(struct shrinker *shrink,
nfsd_cache_size_limit(void)
{
unsigned int limit;
- unsigned long low_pages = totalram_pages - totalhigh_pages;
+ unsigned long low_pages = totalram_pages() - totalhigh_pages();
limit = (16 * int_sqrt(low_pages)) << (PAGE_SHIFT-10);
return min_t(unsigned int, limit, 256*1024);
diff --git a/fs/ntfs/malloc.h b/fs/ntfs/malloc.h
index ab172e5..5becc8a 100644
--- a/fs/ntfs/malloc.h
+++ b/fs/ntfs/malloc.h
@@ -47,7 +47,7 @@ static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
/* return (void *)__get_free_page(gfp_mask); */
}
- if (likely((size >> PAGE_SHIFT) < totalram_pages))
+ if (likely((size >> PAGE_SHIFT) < totalram_pages()))
return __vmalloc(size, gfp_mask, PAGE_KERNEL);
return NULL;
}
diff --git a/fs/proc/base.c b/fs/proc/base.c
index ce34654..d7fd1ca 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -530,7 +530,7 @@ static ssize_t lstats_write(struct file *file, const char __user *buf,
static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
- unsigned long totalpages = totalram_pages + total_swap_pages;
+ unsigned long totalpages = totalram_pages() + total_swap_pages;
unsigned long points = 0;
points = oom_badness(task, NULL, NULL, totalpages) *
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 0690679..cea3a01 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -36,7 +36,31 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
/* declarations for linux/mm/highmem.c */
unsigned int nr_free_highpages(void);
-extern unsigned long totalhigh_pages;
+extern atomic_long_t _totalhigh_pages;
+static inline unsigned long totalhigh_pages(void)
+{
+ return (unsigned long)atomic_long_read(&_totalhigh_pages);
+}
+
+static inline void totalhigh_pages_inc(void)
+{
+ atomic_long_inc(&_totalhigh_pages);
+}
+
+static inline void totalhigh_pages_dec(void)
+{
+ atomic_long_dec(&_totalhigh_pages);
+}
+
+static inline void totalhigh_pages_add(long count)
+{
+ atomic_long_add(count, &_totalhigh_pages);
+}
+
+static inline void totalhigh_pages_set(long val)
+{
+ atomic_long_set(&_totalhigh_pages, val);
+}
void kmap_flush_unused(void);
@@ -51,7 +75,7 @@ static inline struct page *kmap_to_page(void *addr)
return virt_to_page(addr);
}
-#define totalhigh_pages 0UL
+static inline unsigned long totalhigh_pages(void) { return 0UL; }
#ifndef ARCH_HAS_KMAP
static inline void *kmap(struct page *page)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fcf9cc9..d2c1646 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -48,7 +48,32 @@ static inline void set_max_mapnr(unsigned long limit)
static inline void set_max_mapnr(unsigned long limit) { }
#endif
-extern unsigned long totalram_pages;
+extern atomic_long_t _totalram_pages;
+static inline unsigned long totalram_pages(void)
+{
+ return (unsigned long)atomic_long_read(&_totalram_pages);
+}
+
+static inline void totalram_pages_inc(void)
+{
+ atomic_long_inc(&_totalram_pages);
+}
+
+static inline void totalram_pages_dec(void)
+{
+ atomic_long_dec(&_totalram_pages);
+}
+
+static inline void totalram_pages_add(long count)
+{
+ atomic_long_add(count, &_totalram_pages);
+}
+
+static inline void totalram_pages_set(long val)
+{
+ atomic_long_set(&_totalram_pages, val);
+}
+
extern void * high_memory;
extern int page_cluster;
diff --git a/include/linux/swap.h b/include/linux/swap.h
index d098743..80d0ab6 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -309,7 +309,6 @@ struct vma_swap_readahead {
} while (0)
/* linux/mm/page_alloc.c */
-extern unsigned long totalram_pages;
extern unsigned long totalreserve_pages;
extern unsigned long nr_free_buffer_pages(void);
extern unsigned long nr_free_pagecache_pages(void);
diff --git a/kernel/fork.c b/kernel/fork.c
index 63d57f7..fa524b2 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -739,7 +739,7 @@ void __init __weak arch_task_cache_init(void) { }
static void set_max_threads(unsigned int max_threads_suggested)
{
u64 threads;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
/*
* The number of threads shall be limited such that the thread
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index dff217c..7c50f56 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -152,7 +152,7 @@ int sanity_check_segment_list(struct kimage *image)
int i;
unsigned long nr_segments = image->nr_segments;
unsigned long total_pages = 0;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
/*
* Verify we have good destination addresses. The caller is
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index b0308a2..640b203 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -105,7 +105,7 @@ void __init hibernate_reserved_size_init(void)
void __init hibernate_image_size_init(void)
{
- image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
+ image_size = ((totalram_pages() * 2) / 5) * PAGE_SIZE;
}
/*
diff --git a/mm/highmem.c b/mm/highmem.c
index 59db322..02a9a4b 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -105,9 +105,7 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
}
#endif
-unsigned long totalhigh_pages __read_mostly;
-EXPORT_SYMBOL(totalhigh_pages);
-
+atomic_long_t _totalhigh_pages __read_mostly;
EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d394d18..9a36c67 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -420,7 +420,7 @@ static int __init hugepage_init(void)
* where the extra memory used could hurt more than TLB overhead
* is likely to save. The admin can still enable it through /sys.
*/
- if (totalram_pages < (512 << (20 - PAGE_SHIFT))) {
+ if (totalram_pages() < (512 << (20 - PAGE_SHIFT))) {
transparent_hugepage_flags = 0;
return 0;
}
diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index b209dba..5be4639 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -236,7 +236,7 @@ void quarantine_reduce(void)
* Update quarantine size in case of hotplug. Allocate a fraction of
* the installed memory to quarantine minus per-cpu queue limits.
*/
- total_size = (READ_ONCE(totalram_pages) << PAGE_SHIFT) /
+ total_size = (READ_ONCE(totalram_pages()) << PAGE_SHIFT) /
QUARANTINE_FRACTION;
percpu_quarantines = QUARANTINE_PERCPU_SIZE * num_online_cpus();
new_quarantine_size = (total_size < percpu_quarantines) ?
diff --git a/mm/memblock.c b/mm/memblock.c
index 14a6219..ab089b2 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1627,7 +1627,7 @@ void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
for (; cursor < end; cursor++) {
memblock_free_pages(pfn_to_page(cursor), cursor, 0);
- totalram_pages++;
+ totalram_pages_inc();
}
}
@@ -2029,7 +2029,7 @@ unsigned long __init memblock_free_all(void)
reset_all_zones_managed_pages();
pages = free_low_memory_core_early();
- totalram_pages += pages;
+ totalram_pages_add(pages);
return pages;
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index dbbb945..25b8377 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -657,10 +657,10 @@ void __online_page_free(struct page *page)
static int generic_online_page(struct page *page, unsigned int order)
{
__free_pages_core(page, order);
- totalram_pages += (1UL << order);
+ totalram_pages_add((1UL << order));
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
- totalhigh_pages += (1UL << order);
+ totalhigh_pages_add((1UL << order));
#endif
return 0;
}
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 6838a53..3391710 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -146,7 +146,7 @@ static void __meminit mm_compute_batch(void)
s32 batch = max_t(s32, nr*2, 32);
/* batch size set to 0.4% of (total memory/#cpus), or max int32 */
- memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
+ memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff);
vm_committed_as_batch = max_t(s32, memsized_batch, batch);
}
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 6589f60..21d4877 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -269,7 +269,7 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc)
}
/* Default to all available memory */
- oc->totalpages = totalram_pages + total_swap_pages;
+ oc->totalpages = totalram_pages() + total_swap_pages;
if (!IS_ENABLED(CONFIG_NUMA))
return CONSTRAINT_NONE;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f077849..af832de 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -16,6 +16,7 @@
#include <linux/stddef.h>
#include <linux/mm.h>
+#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
@@ -124,7 +125,7 @@
/* Protect totalram_pages and zone->managed_pages */
static DEFINE_SPINLOCK(managed_page_count_lock);
-unsigned long totalram_pages __read_mostly;
+atomic_long_t _totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long totalcma_pages __read_mostly;
@@ -4744,11 +4745,11 @@ long si_mem_available(void)
void si_meminfo(struct sysinfo *val)
{
- val->totalram = totalram_pages;
+ val->totalram = totalram_pages();
val->sharedram = global_node_page_state(NR_SHMEM);
val->freeram = global_zone_page_state(NR_FREE_PAGES);
val->bufferram = nr_blockdev_pages();
- val->totalhigh = totalhigh_pages;
+ val->totalhigh = totalhigh_pages();
val->freehigh = nr_free_highpages();
val->mem_unit = PAGE_SIZE;
}
@@ -7063,10 +7064,10 @@ void adjust_managed_page_count(struct page *page, long count)
{
spin_lock(&managed_page_count_lock);
atomic_long_add(count, &page_zone(page)->managed_pages);
- totalram_pages += count;
+ totalram_pages_add(count);
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
- totalhigh_pages += count;
+ totalhigh_pages_add(count);
#endif
spin_unlock(&managed_page_count_lock);
}
@@ -7109,9 +7110,9 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
void free_highmem_page(struct page *page)
{
__free_reserved_page(page);
- totalram_pages++;
+ totalram_pages_inc();
atomic_long_inc(&page_zone(page)->managed_pages);
- totalhigh_pages++;
+ totalhigh_pages_inc();
}
#endif
@@ -7160,10 +7161,10 @@ void __init mem_init_print_info(const char *str)
physpages << (PAGE_SHIFT - 10),
codesize >> 10, datasize >> 10, rosize >> 10,
(init_data_size + init_code_size) >> 10, bss_size >> 10,
- (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10),
+ (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT - 10),
totalcma_pages << (PAGE_SHIFT - 10),
#ifdef CONFIG_HIGHMEM
- totalhigh_pages << (PAGE_SHIFT - 10),
+ totalhigh_pages() << (PAGE_SHIFT - 10),
#endif
str ? ", " : "", str ? str : "");
}
diff --git a/mm/shmem.c b/mm/shmem.c
index 6556e86..d4ee5a6 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -109,13 +109,13 @@ struct shmem_falloc {
#ifdef CONFIG_TMPFS
static unsigned long shmem_default_max_blocks(void)
{
- return totalram_pages / 2;
+ return totalram_pages() / 2;
}
static unsigned long shmem_default_max_inodes(void)
{
- unsigned long totalram_pgs = totalram_pages;
- return min(totalram_pgs - totalhigh_pages, totalram_pgs / 2);
+ unsigned long totalram_pgs = totalram_pages();
+ return min(totalram_pgs - totalhigh_pages(), totalram_pgs / 2);
}
#endif
@@ -3275,7 +3275,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
size = memparse(value,&rest);
if (*rest == '%') {
size <<= PAGE_SHIFT;
- size *= totalram_pages;
+ size *= totalram_pages();
do_div(size, 100);
rest++;
}
diff --git a/mm/slab.c b/mm/slab.c
index 2a5654b..bc3de2f 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1248,7 +1248,7 @@ void __init kmem_cache_init(void)
* page orders on machines with more than 32MB of memory if
* not overridden on the command line.
*/
- if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT)
+ if (!slab_max_order_set && totalram_pages() > (32 << 20) >> PAGE_SHIFT)
slab_max_order = SLAB_MAX_ORDER_HI;
/* Bootstrap is tricky, because several objects are allocated
diff --git a/mm/swap.c b/mm/swap.c
index aa48371..a87bd4c 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -1023,7 +1023,7 @@ unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
*/
void __init swap_setup(void)
{
- unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT);
+ unsigned long megs = totalram_pages() >> (20 - PAGE_SHIFT);
/* Use a smaller cluster for small-memory machines */
if (megs < 16)
diff --git a/mm/util.c b/mm/util.c
index 7f1f165..c3256d5 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -600,7 +600,7 @@ unsigned long vm_commit_limit(void)
if (sysctl_overcommit_kbytes)
allowed = sysctl_overcommit_kbytes >> (PAGE_SHIFT - 10);
else
- allowed = ((totalram_pages - hugetlb_total_pages())
+ allowed = ((totalram_pages() - hugetlb_total_pages())
* sysctl_overcommit_ratio / 100);
allowed += total_swap_pages;
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 97d4b25..871e41c 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1634,7 +1634,7 @@ void *vmap(struct page **pages, unsigned int count,
might_sleep();
- if (count > totalram_pages)
+ if (count > totalram_pages())
return NULL;
size = (unsigned long)count << PAGE_SHIFT;
@@ -1739,7 +1739,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
unsigned long real_size = size;
size = PAGE_ALIGN(size);
- if (!size || (size >> PAGE_SHIFT) > totalram_pages)
+ if (!size || (size >> PAGE_SHIFT) > totalram_pages())
goto fail;
area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED |
diff --git a/mm/workingset.c b/mm/workingset.c
index b15799d..bd17239 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -550,7 +550,7 @@ static int __init workingset_init(void)
* double the initial memory by using totalram_pages as-is.
*/
timestamp_bits = BITS_PER_LONG - EVICTION_SHIFT;
- max_order = fls_long(totalram_pages - 1);
+ max_order = fls_long(totalram_pages() - 1);
if (max_order > timestamp_bits)
bucket_order = max_order - timestamp_bits;
pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
diff --git a/mm/zswap.c b/mm/zswap.c
index cd91fd9..a4e4d36 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -219,8 +219,8 @@ struct zswap_tree {
static bool zswap_is_full(void)
{
- return totalram_pages * zswap_max_pool_percent / 100 <
- DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE);
+ return totalram_pages() * zswap_max_pool_percent / 100 <
+ DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE);
}
static void zswap_update_total_size(void)
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 0cef31e..44f1bf7 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -1131,7 +1131,7 @@ static inline void dccp_mib_exit(void)
static int __init dccp_init(void)
{
unsigned long goal;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
int ehash_order, bhash_order, i;
int rc;
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 1c002c0..950613e 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1866,7 +1866,7 @@ void __init dn_route_init(void)
dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
add_timer(&dn_route_timer);
- goal = totalram_pages >> (26 - PAGE_SHIFT);
+ goal = totalram_pages() >> (26 - PAGE_SHIFT);
for(order = 0; (1UL << order) < goal; order++)
/* NOTHING */;
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 03b51cd..b467a7c 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -1000,7 +1000,7 @@ static int __net_init tcp_net_metrics_init(struct net *net)
slots = tcpmhash_entries;
if (!slots) {
- if (totalram_pages >= 128 * 1024)
+ if (totalram_pages() >= 128 * 1024)
slots = 16 * 1024;
else
slots = 8 * 1024;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 0b1801e..edc83f2 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -2248,7 +2248,7 @@ static __always_inline unsigned int total_extension_size(void)
int nf_conntrack_init_start(void)
{
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
int max_factor = 8;
int ret = -ENOMEM;
int i;
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 6cb9a74..2df06c4f 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -274,7 +274,7 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg,
struct xt_hashlimit_htable *hinfo;
const struct seq_operations *ops;
unsigned int size, i;
- unsigned long totalram_pgs = totalram_pages;
+ unsigned long totalram_pgs = totalram_pages();
int ret;
if (cfg->size) {
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 16bd187..d6f3280 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -106,7 +106,7 @@ void ima_add_kexec_buffer(struct kimage *image)
kexec_segment_size = ALIGN(ima_get_binary_runtime_size() +
PAGE_SIZE / 2, PAGE_SIZE);
if ((kexec_segment_size == ULONG_MAX) ||
- ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages / 2)) {
+ ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages() / 2)) {
pr_err("Binary measurement list too large.\n");
return;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 20+ messages in thread
* [PATCH v1 4/4] mm: Remove managed_page_count spinlock
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
` (2 preceding siblings ...)
2018-10-26 11:01 ` [PATCH v1 3/4] mm: convert totalram_pages and totalhigh_pages variables to atomic Arun KS
@ 2018-10-26 11:01 ` Arun KS
[not found] ` <20181106141732.GR27423@dhcp22.suse.cz>
2018-11-07 11:50 ` Vlastimil Babka
2018-11-06 5:38 ` [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-11-07 0:22 ` Andrew Morton
5 siblings, 2 replies; 20+ messages in thread
From: Arun KS @ 2018-10-26 11:01 UTC (permalink / raw)
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
Now totalram_pages and managed_pages are atomic varibles. No need
of managed_page_count spinlock.
Signed-off-by: Arun KS <arunks@codeaurora.org>
---
include/linux/mmzone.h | 6 ------
mm/page_alloc.c | 5 -----
2 files changed, 11 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 597b0c7..aa960f6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -428,12 +428,6 @@ struct zone {
* Write access to present_pages at runtime should be protected by
* mem_hotplug_begin/end(). Any reader who can't tolerant drift of
* present_pages should get_online_mems() to get a stable value.
- *
- * Read access to managed_pages should be safe because it's unsigned
- * long. Write access to zone->managed_pages and totalram_pages are
- * protected by managed_page_count_lock at runtime. Idealy only
- * adjust_managed_page_count() should be used instead of directly
- * touching zone->managed_pages and totalram_pages.
*/
atomic_long_t managed_pages;
unsigned long spanned_pages;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index af832de..e29e78f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -122,9 +122,6 @@
};
EXPORT_SYMBOL(node_states);
-/* Protect totalram_pages and zone->managed_pages */
-static DEFINE_SPINLOCK(managed_page_count_lock);
-
atomic_long_t _totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long totalcma_pages __read_mostly;
@@ -7062,14 +7059,12 @@ static int __init cmdline_parse_movablecore(char *p)
void adjust_managed_page_count(struct page *page, long count)
{
- spin_lock(&managed_page_count_lock);
atomic_long_add(count, &page_zone(page)->managed_pages);
totalram_pages_add(count);
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
totalhigh_pages_add(count);
#endif
- spin_unlock(&managed_page_count_lock);
}
EXPORT_SYMBOL(adjust_managed_page_count);
--
1.9.1
^ permalink raw reply related [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
` (3 preceding siblings ...)
2018-10-26 11:01 ` [PATCH v1 4/4] mm: Remove managed_page_count spinlock Arun KS
@ 2018-11-06 5:38 ` Arun KS
2018-11-06 8:17 ` Konstantin Khlebnikov
2018-11-07 0:22 ` Andrew Morton
5 siblings, 1 reply; 20+ messages in thread
From: Arun KS @ 2018-11-06 5:38 UTC (permalink / raw)
To: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, julia.lawall
Any comments?
Regards,
Arun
On 2018-10-26 16:30, Arun KS wrote:
> This series convert totalram_pages, totalhigh_pages and
> zone->managed_pages to atomic variables.
>
> The patch was comiple tested on x86(x86_64_defconfig & i386_defconfig)
> on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
> older version of kernel.
>
> Arun KS (4):
> mm: Fix multiple evaluvations of totalram_pages and managed_pages
> mm: Convert zone->managed_pages to atomic variable
> mm: convert totalram_pages and totalhigh_pages variables to atomic
> mm: Remove managed_page_count spinlock
>
> arch/csky/mm/init.c | 4 +-
> arch/powerpc/platforms/pseries/cmm.c | 10 ++--
> arch/s390/mm/init.c | 2 +-
> arch/um/kernel/mem.c | 3 +-
> arch/x86/kernel/cpu/microcode/core.c | 5 +-
> drivers/char/agp/backend.c | 4 +-
> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
> drivers/gpu/drm/i915/i915_gem.c | 2 +-
> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
> drivers/hv/hv_balloon.c | 19 +++----
> drivers/md/dm-bufio.c | 2 +-
> drivers/md/dm-crypt.c | 2 +-
> drivers/md/dm-integrity.c | 2 +-
> drivers/md/dm-stats.c | 2 +-
> drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
> drivers/misc/vmw_balloon.c | 2 +-
> drivers/parisc/ccio-dma.c | 4 +-
> drivers/parisc/sba_iommu.c | 4 +-
> drivers/staging/android/ion/ion_system_heap.c | 2 +-
> drivers/xen/xen-selfballoon.c | 6 +--
> fs/ceph/super.h | 2 +-
> fs/file_table.c | 7 +--
> fs/fuse/inode.c | 2 +-
> fs/nfs/write.c | 2 +-
> fs/nfsd/nfscache.c | 2 +-
> fs/ntfs/malloc.h | 2 +-
> fs/proc/base.c | 2 +-
> include/linux/highmem.h | 28 ++++++++++-
> include/linux/mm.h | 27 +++++++++-
> include/linux/mmzone.h | 15 +++---
> include/linux/swap.h | 1 -
> kernel/fork.c | 5 +-
> kernel/kexec_core.c | 5 +-
> kernel/power/snapshot.c | 2 +-
> lib/show_mem.c | 2 +-
> mm/highmem.c | 4 +-
> mm/huge_memory.c | 2 +-
> mm/kasan/quarantine.c | 2 +-
> mm/memblock.c | 6 +--
> mm/memory_hotplug.c | 4 +-
> mm/mm_init.c | 2 +-
> mm/oom_kill.c | 2 +-
> mm/page_alloc.c | 71
> +++++++++++++--------------
> mm/shmem.c | 7 +--
> mm/slab.c | 2 +-
> mm/swap.c | 2 +-
> mm/util.c | 2 +-
> mm/vmalloc.c | 4 +-
> mm/vmstat.c | 4 +-
> mm/workingset.c | 2 +-
> mm/zswap.c | 4 +-
> net/dccp/proto.c | 7 +--
> net/decnet/dn_route.c | 2 +-
> net/ipv4/tcp_metrics.c | 2 +-
> net/netfilter/nf_conntrack_core.c | 7 +--
> net/netfilter/xt_hashlimit.c | 5 +-
> net/sctp/protocol.c | 7 +--
> security/integrity/ima/ima_kexec.c | 2 +-
> 58 files changed, 195 insertions(+), 144 deletions(-)
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-06 5:38 ` [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
@ 2018-11-06 8:17 ` Konstantin Khlebnikov
2018-11-06 8:30 ` Arun KS
0 siblings, 1 reply; 20+ messages in thread
From: Konstantin Khlebnikov @ 2018-11-06 8:17 UTC (permalink / raw)
To: Arun KS, keescook, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, julia.lawall
On 06.11.2018 8:38, Arun KS wrote:
> Any comments?
Looks good.
Except unclear motivation behind this change.
This should be in comment of one of patch.
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
>
> Regards,
> Arun
>
> On 2018-10-26 16:30, Arun KS wrote:
>> This series convert totalram_pages, totalhigh_pages and
>> zone->managed_pages to atomic variables.
>>
>> The patch was comiple tested on x86(x86_64_defconfig & i386_defconfig)
>> on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
>> older version of kernel.
>>
>> Arun KS (4):
>> mm: Fix multiple evaluvations of totalram_pages and managed_pages
>> mm: Convert zone->managed_pages to atomic variable
>> mm: convert totalram_pages and totalhigh_pages variables to atomic
>> mm: Remove managed_page_count spinlock
>>
>> arch/csky/mm/init.c | 4 +-
>> arch/powerpc/platforms/pseries/cmm.c | 10 ++--
>> arch/s390/mm/init.c | 2 +-
>> arch/um/kernel/mem.c | 3 +-
>> arch/x86/kernel/cpu/microcode/core.c | 5 +-
>> drivers/char/agp/backend.c | 4 +-
>> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
>> drivers/gpu/drm/i915/i915_gem.c | 2 +-
>> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
>> drivers/hv/hv_balloon.c | 19 +++----
>> drivers/md/dm-bufio.c | 2 +-
>> drivers/md/dm-crypt.c | 2 +-
>> drivers/md/dm-integrity.c | 2 +-
>> drivers/md/dm-stats.c | 2 +-
>> drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
>> drivers/misc/vmw_balloon.c | 2 +-
>> drivers/parisc/ccio-dma.c | 4 +-
>> drivers/parisc/sba_iommu.c | 4 +-
>> drivers/staging/android/ion/ion_system_heap.c | 2 +-
>> drivers/xen/xen-selfballoon.c | 6 +--
>> fs/ceph/super.h | 2 +-
>> fs/file_table.c | 7 +--
>> fs/fuse/inode.c | 2 +-
>> fs/nfs/write.c | 2 +-
>> fs/nfsd/nfscache.c | 2 +-
>> fs/ntfs/malloc.h | 2 +-
>> fs/proc/base.c | 2 +-
>> include/linux/highmem.h | 28 ++++++++++-
>> include/linux/mm.h | 27 +++++++++-
>> include/linux/mmzone.h | 15 +++---
>> include/linux/swap.h | 1 -
>> kernel/fork.c | 5 +-
>> kernel/kexec_core.c | 5 +-
>> kernel/power/snapshot.c | 2 +-
>> lib/show_mem.c | 2 +-
>> mm/highmem.c | 4 +-
>> mm/huge_memory.c | 2 +-
>> mm/kasan/quarantine.c | 2 +-
>> mm/memblock.c | 6 +--
>> mm/memory_hotplug.c | 4 +-
>> mm/mm_init.c | 2 +-
>> mm/oom_kill.c | 2 +-
>> mm/page_alloc.c | 71 +++++++++++++--------------
>> mm/shmem.c | 7 +--
>> mm/slab.c | 2 +-
>> mm/swap.c | 2 +-
>> mm/util.c | 2 +-
>> mm/vmalloc.c | 4 +-
>> mm/vmstat.c | 4 +-
>> mm/workingset.c | 2 +-
>> mm/zswap.c | 4 +-
>> net/dccp/proto.c | 7 +--
>> net/decnet/dn_route.c | 2 +-
>> net/ipv4/tcp_metrics.c | 2 +-
>> net/netfilter/nf_conntrack_core.c | 7 +--
>> net/netfilter/xt_hashlimit.c | 5 +-
>> net/sctp/protocol.c | 7 +--
>> security/integrity/ima/ima_kexec.c | 2 +-
>> 58 files changed, 195 insertions(+), 144 deletions(-)
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-06 8:17 ` Konstantin Khlebnikov
@ 2018-11-06 8:30 ` Arun KS
2018-11-06 8:37 ` Konstantin Khlebnikov
0 siblings, 1 reply; 20+ messages in thread
From: Arun KS @ 2018-11-06 8:30 UTC (permalink / raw)
To: Konstantin Khlebnikov
Cc: keescook, minchan, getarunks, gregkh, akpm, mhocko, vbabka,
linux-kernel, linux-mm, julia.lawall
On 2018-11-06 13:47, Konstantin Khlebnikov wrote:
> On 06.11.2018 8:38, Arun KS wrote:
>> Any comments?
>
> Looks good.
> Except unclear motivation behind this change.
> This should be in comment of one of patch.
totalram_pages, zone->managed_pages and totalhigh_pages are sometimes
modified outside managed_page_count_lock. Hence convert these variable
to atomic to avoid readers potentially seeing a store tear.
Will update the comment.
Regards,
Arun
>
> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
>
>>
>> Regards,
>> Arun
>>
>> On 2018-10-26 16:30, Arun KS wrote:
>>> This series convert totalram_pages, totalhigh_pages and
>>> zone->managed_pages to atomic variables.
>>>
>>> The patch was comiple tested on x86(x86_64_defconfig &
>>> i386_defconfig)
>>> on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
>>> older version of kernel.
>>>
>>> Arun KS (4):
>>> mm: Fix multiple evaluvations of totalram_pages and managed_pages
>>> mm: Convert zone->managed_pages to atomic variable
>>> mm: convert totalram_pages and totalhigh_pages variables to atomic
>>> mm: Remove managed_page_count spinlock
>>>
>>> arch/csky/mm/init.c | 4 +-
>>> arch/powerpc/platforms/pseries/cmm.c | 10 ++--
>>> arch/s390/mm/init.c | 2 +-
>>> arch/um/kernel/mem.c | 3 +-
>>> arch/x86/kernel/cpu/microcode/core.c | 5 +-
>>> drivers/char/agp/backend.c | 4 +-
>>> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
>>> drivers/gpu/drm/i915/i915_gem.c | 2 +-
>>> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
>>> drivers/hv/hv_balloon.c | 19 +++----
>>> drivers/md/dm-bufio.c | 2 +-
>>> drivers/md/dm-crypt.c | 2 +-
>>> drivers/md/dm-integrity.c | 2 +-
>>> drivers/md/dm-stats.c | 2 +-
>>> drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
>>> drivers/misc/vmw_balloon.c | 2 +-
>>> drivers/parisc/ccio-dma.c | 4 +-
>>> drivers/parisc/sba_iommu.c | 4 +-
>>> drivers/staging/android/ion/ion_system_heap.c | 2 +-
>>> drivers/xen/xen-selfballoon.c | 6 +--
>>> fs/ceph/super.h | 2 +-
>>> fs/file_table.c | 7 +--
>>> fs/fuse/inode.c | 2 +-
>>> fs/nfs/write.c | 2 +-
>>> fs/nfsd/nfscache.c | 2 +-
>>> fs/ntfs/malloc.h | 2 +-
>>> fs/proc/base.c | 2 +-
>>> include/linux/highmem.h | 28 ++++++++++-
>>> include/linux/mm.h | 27 +++++++++-
>>> include/linux/mmzone.h | 15 +++---
>>> include/linux/swap.h | 1 -
>>> kernel/fork.c | 5 +-
>>> kernel/kexec_core.c | 5 +-
>>> kernel/power/snapshot.c | 2 +-
>>> lib/show_mem.c | 2 +-
>>> mm/highmem.c | 4 +-
>>> mm/huge_memory.c | 2 +-
>>> mm/kasan/quarantine.c | 2 +-
>>> mm/memblock.c | 6 +--
>>> mm/memory_hotplug.c | 4 +-
>>> mm/mm_init.c | 2 +-
>>> mm/oom_kill.c | 2 +-
>>> mm/page_alloc.c | 71
>>> +++++++++++++--------------
>>> mm/shmem.c | 7 +--
>>> mm/slab.c | 2 +-
>>> mm/swap.c | 2 +-
>>> mm/util.c | 2 +-
>>> mm/vmalloc.c | 4 +-
>>> mm/vmstat.c | 4 +-
>>> mm/workingset.c | 2 +-
>>> mm/zswap.c | 4 +-
>>> net/dccp/proto.c | 7 +--
>>> net/decnet/dn_route.c | 2 +-
>>> net/ipv4/tcp_metrics.c | 2 +-
>>> net/netfilter/nf_conntrack_core.c | 7 +--
>>> net/netfilter/xt_hashlimit.c | 5 +-
>>> net/sctp/protocol.c | 7 +--
>>> security/integrity/ima/ima_kexec.c | 2 +-
>>> 58 files changed, 195 insertions(+), 144 deletions(-)
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-06 8:30 ` Arun KS
@ 2018-11-06 8:37 ` Konstantin Khlebnikov
2018-11-06 8:43 ` Arun KS
0 siblings, 1 reply; 20+ messages in thread
From: Konstantin Khlebnikov @ 2018-11-06 8:37 UTC (permalink / raw)
To: Arun KS
Cc: keescook, minchan, getarunks, gregkh, akpm, mhocko, vbabka,
linux-kernel, linux-mm, julia.lawall
On 06.11.2018 11:30, Arun KS wrote:
> On 2018-11-06 13:47, Konstantin Khlebnikov wrote:
>> On 06.11.2018 8:38, Arun KS wrote:
>>> Any comments?
>>
>> Looks good.
>> Except unclear motivation behind this change.
>> This should be in comment of one of patch.
>
> totalram_pages, zone->managed_pages and totalhigh_pages are sometimes modified outside managed_page_count_lock. Hence convert these variable
> to atomic to avoid readers potentially seeing a store tear.
So, this is just theoretical issue or splat from sanitizer.
After boot memory online\offline are strictly serialized by rw-semaphore.
>
> Will update the comment.
>
> Regards,
> Arun
>
>>
>> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
>>
>>>
>>> Regards,
>>> Arun
>>>
>>> On 2018-10-26 16:30, Arun KS wrote:
>>>> This series convert totalram_pages, totalhigh_pages and
>>>> zone->managed_pages to atomic variables.
>>>>
>>>> The patch was comiple tested on x86(x86_64_defconfig & i386_defconfig)
>>>> on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
>>>> older version of kernel.
>>>>
>>>> Arun KS (4):
>>>> mm: Fix multiple evaluvations of totalram_pages and managed_pages
>>>> mm: Convert zone->managed_pages to atomic variable
>>>> mm: convert totalram_pages and totalhigh_pages variables to atomic
>>>> mm: Remove managed_page_count spinlock
>>>>
>>>> arch/csky/mm/init.c | 4 +-
>>>> arch/powerpc/platforms/pseries/cmm.c | 10 ++--
>>>> arch/s390/mm/init.c | 2 +-
>>>> arch/um/kernel/mem.c | 3 +-
>>>> arch/x86/kernel/cpu/microcode/core.c | 5 +-
>>>> drivers/char/agp/backend.c | 4 +-
>>>> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
>>>> drivers/gpu/drm/i915/i915_gem.c | 2 +-
>>>> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
>>>> drivers/hv/hv_balloon.c | 19 +++----
>>>> drivers/md/dm-bufio.c | 2 +-
>>>> drivers/md/dm-crypt.c | 2 +-
>>>> drivers/md/dm-integrity.c | 2 +-
>>>> drivers/md/dm-stats.c | 2 +-
>>>> drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
>>>> drivers/misc/vmw_balloon.c | 2 +-
>>>> drivers/parisc/ccio-dma.c | 4 +-
>>>> drivers/parisc/sba_iommu.c | 4 +-
>>>> drivers/staging/android/ion/ion_system_heap.c | 2 +-
>>>> drivers/xen/xen-selfballoon.c | 6 +--
>>>> fs/ceph/super.h | 2 +-
>>>> fs/file_table.c | 7 +--
>>>> fs/fuse/inode.c | 2 +-
>>>> fs/nfs/write.c | 2 +-
>>>> fs/nfsd/nfscache.c | 2 +-
>>>> fs/ntfs/malloc.h | 2 +-
>>>> fs/proc/base.c | 2 +-
>>>> include/linux/highmem.h | 28 ++++++++++-
>>>> include/linux/mm.h | 27 +++++++++-
>>>> include/linux/mmzone.h | 15 +++---
>>>> include/linux/swap.h | 1 -
>>>> kernel/fork.c | 5 +-
>>>> kernel/kexec_core.c | 5 +-
>>>> kernel/power/snapshot.c | 2 +-
>>>> lib/show_mem.c | 2 +-
>>>> mm/highmem.c | 4 +-
>>>> mm/huge_memory.c | 2 +-
>>>> mm/kasan/quarantine.c | 2 +-
>>>> mm/memblock.c | 6 +--
>>>> mm/memory_hotplug.c | 4 +-
>>>> mm/mm_init.c | 2 +-
>>>> mm/oom_kill.c | 2 +-
>>>> mm/page_alloc.c | 71 +++++++++++++--------------
>>>> mm/shmem.c | 7 +--
>>>> mm/slab.c | 2 +-
>>>> mm/swap.c | 2 +-
>>>> mm/util.c | 2 +-
>>>> mm/vmalloc.c | 4 +-
>>>> mm/vmstat.c | 4 +-
>>>> mm/workingset.c | 2 +-
>>>> mm/zswap.c | 4 +-
>>>> net/dccp/proto.c | 7 +--
>>>> net/decnet/dn_route.c | 2 +-
>>>> net/ipv4/tcp_metrics.c | 2 +-
>>>> net/netfilter/nf_conntrack_core.c | 7 +--
>>>> net/netfilter/xt_hashlimit.c | 5 +-
>>>> net/sctp/protocol.c | 7 +--
>>>> security/integrity/ima/ima_kexec.c | 2 +-
>>>> 58 files changed, 195 insertions(+), 144 deletions(-)
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-06 8:37 ` Konstantin Khlebnikov
@ 2018-11-06 8:43 ` Arun KS
2018-11-07 7:02 ` Konstantin Khlebnikov
0 siblings, 1 reply; 20+ messages in thread
From: Arun KS @ 2018-11-06 8:43 UTC (permalink / raw)
To: Konstantin Khlebnikov
Cc: keescook, minchan, getarunks, gregkh, akpm, mhocko, vbabka,
linux-kernel, linux-mm, julia.lawall
On 2018-11-06 14:07, Konstantin Khlebnikov wrote:
> On 06.11.2018 11:30, Arun KS wrote:
>> On 2018-11-06 13:47, Konstantin Khlebnikov wrote:
>>> On 06.11.2018 8:38, Arun KS wrote:
>>>> Any comments?
>>>
>>> Looks good.
>>> Except unclear motivation behind this change.
>>> This should be in comment of one of patch.
>>
>> totalram_pages, zone->managed_pages and totalhigh_pages are sometimes
>> modified outside managed_page_count_lock. Hence convert these variable
>> to atomic to avoid readers potentially seeing a store tear.
>
> So, this is just theoretical issue or splat from sanitizer.
> After boot memory online\offline are strictly serialized by
> rw-semaphore.
Few instances which can race with hot add. Please see below,
https://patchwork.kernel.org/patch/10627521/
Regards,
Arun
>
>>
>> Will update the comment.
>>
>> Regards,
>> Arun
>>
>>>
>>> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
>>>
>>>>
>>>> Regards,
>>>> Arun
>>>>
>>>> On 2018-10-26 16:30, Arun KS wrote:
>>>>> This series convert totalram_pages, totalhigh_pages and
>>>>> zone->managed_pages to atomic variables.
>>>>>
>>>>> The patch was comiple tested on x86(x86_64_defconfig &
>>>>> i386_defconfig)
>>>>> on tip of linux-mmotm. And memory hotplug tested on arm64, but on
>>>>> an
>>>>> older version of kernel.
>>>>>
>>>>> Arun KS (4):
>>>>> mm: Fix multiple evaluvations of totalram_pages and managed_pages
>>>>> mm: Convert zone->managed_pages to atomic variable
>>>>> mm: convert totalram_pages and totalhigh_pages variables to
>>>>> atomic
>>>>> mm: Remove managed_page_count spinlock
>>>>>
>>>>> arch/csky/mm/init.c | 4 +-
>>>>> arch/powerpc/platforms/pseries/cmm.c | 10 ++--
>>>>> arch/s390/mm/init.c | 2 +-
>>>>> arch/um/kernel/mem.c | 3 +-
>>>>> arch/x86/kernel/cpu/microcode/core.c | 5 +-
>>>>> drivers/char/agp/backend.c | 4 +-
>>>>> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
>>>>> drivers/gpu/drm/i915/i915_gem.c | 2 +-
>>>>> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
>>>>> drivers/hv/hv_balloon.c | 19 +++----
>>>>> drivers/md/dm-bufio.c | 2 +-
>>>>> drivers/md/dm-crypt.c | 2 +-
>>>>> drivers/md/dm-integrity.c | 2 +-
>>>>> drivers/md/dm-stats.c | 2 +-
>>>>> drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
>>>>> drivers/misc/vmw_balloon.c | 2 +-
>>>>> drivers/parisc/ccio-dma.c | 4 +-
>>>>> drivers/parisc/sba_iommu.c | 4 +-
>>>>> drivers/staging/android/ion/ion_system_heap.c | 2 +-
>>>>> drivers/xen/xen-selfballoon.c | 6 +--
>>>>> fs/ceph/super.h | 2 +-
>>>>> fs/file_table.c | 7 +--
>>>>> fs/fuse/inode.c | 2 +-
>>>>> fs/nfs/write.c | 2 +-
>>>>> fs/nfsd/nfscache.c | 2 +-
>>>>> fs/ntfs/malloc.h | 2 +-
>>>>> fs/proc/base.c | 2 +-
>>>>> include/linux/highmem.h | 28 ++++++++++-
>>>>> include/linux/mm.h | 27 +++++++++-
>>>>> include/linux/mmzone.h | 15 +++---
>>>>> include/linux/swap.h | 1 -
>>>>> kernel/fork.c | 5 +-
>>>>> kernel/kexec_core.c | 5 +-
>>>>> kernel/power/snapshot.c | 2 +-
>>>>> lib/show_mem.c | 2 +-
>>>>> mm/highmem.c | 4 +-
>>>>> mm/huge_memory.c | 2 +-
>>>>> mm/kasan/quarantine.c | 2 +-
>>>>> mm/memblock.c | 6 +--
>>>>> mm/memory_hotplug.c | 4 +-
>>>>> mm/mm_init.c | 2 +-
>>>>> mm/oom_kill.c | 2 +-
>>>>> mm/page_alloc.c | 71
>>>>> +++++++++++++--------------
>>>>> mm/shmem.c | 7 +--
>>>>> mm/slab.c | 2 +-
>>>>> mm/swap.c | 2 +-
>>>>> mm/util.c | 2 +-
>>>>> mm/vmalloc.c | 4 +-
>>>>> mm/vmstat.c | 4 +-
>>>>> mm/workingset.c | 2 +-
>>>>> mm/zswap.c | 4 +-
>>>>> net/dccp/proto.c | 7 +--
>>>>> net/decnet/dn_route.c | 2 +-
>>>>> net/ipv4/tcp_metrics.c | 2 +-
>>>>> net/netfilter/nf_conntrack_core.c | 7 +--
>>>>> net/netfilter/xt_hashlimit.c | 5 +-
>>>>> net/sctp/protocol.c | 7 +--
>>>>> security/integrity/ima/ima_kexec.c | 2 +-
>>>>> 58 files changed, 195 insertions(+), 144 deletions(-)
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
` (4 preceding siblings ...)
2018-11-06 5:38 ` [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
@ 2018-11-07 0:22 ` Andrew Morton
2018-11-07 6:19 ` Arun KS
5 siblings, 1 reply; 20+ messages in thread
From: Andrew Morton @ 2018-11-07 0:22 UTC (permalink / raw)
To: Arun KS
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, mhocko, vbabka,
linux-kernel, linux-mm
On Fri, 26 Oct 2018 16:30:58 +0530 Arun KS <arunks@codeaurora.org> wrote:
> This series convert totalram_pages, totalhigh_pages and
> zone->managed_pages to atomic variables.
The whole point appears to be removal of managed_page_count_lock, yes?
Why? What is the value of this patchset? If "performance" then are any
measurements available?
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-07 0:22 ` Andrew Morton
@ 2018-11-07 6:19 ` Arun KS
0 siblings, 0 replies; 20+ messages in thread
From: Arun KS @ 2018-11-07 6:19 UTC (permalink / raw)
To: Andrew Morton
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, mhocko, vbabka,
linux-kernel, linux-mm
On 2018-11-07 05:52, Andrew Morton wrote:
> On Fri, 26 Oct 2018 16:30:58 +0530 Arun KS <arunks@codeaurora.org>
> wrote:
>
>> This series convert totalram_pages, totalhigh_pages and
>> zone->managed_pages to atomic variables.
>
> The whole point appears to be removal of managed_page_count_lock, yes?
>
> Why? What is the value of this patchset? If "performance" then are
> any
> measurements available?
Hello Andrew,
https://patchwork.kernel.org/patch/10670787/
In version 2, I have added motivation behind this conversion. Pasting
same here,
totalram_pages, zone->managed_pages and totalhigh_pages updates are
protected by managed_page_count_lock, but readers never care about it.
Convert these variables to atomic to avoid readers potentially seeing a
store tear. I don't think we have a performance improvement here.
Regards,
Arun
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-06 8:43 ` Arun KS
@ 2018-11-07 7:02 ` Konstantin Khlebnikov
2018-11-07 8:50 ` Vlastimil Babka
0 siblings, 1 reply; 20+ messages in thread
From: Konstantin Khlebnikov @ 2018-11-07 7:02 UTC (permalink / raw)
To: Arun KS
Cc: keescook, minchan, getarunks, gregkh, akpm, mhocko, vbabka,
linux-kernel, linux-mm, julia.lawall
On 06.11.2018 11:43, Arun KS wrote:
> On 2018-11-06 14:07, Konstantin Khlebnikov wrote:
>> On 06.11.2018 11:30, Arun KS wrote:
>>> On 2018-11-06 13:47, Konstantin Khlebnikov wrote:
>>>> On 06.11.2018 8:38, Arun KS wrote:
>>>>> Any comments?
>>>>
>>>> Looks good.
>>>> Except unclear motivation behind this change.
>>>> This should be in comment of one of patch.
>>>
>>> totalram_pages, zone->managed_pages and totalhigh_pages are sometimes modified outside managed_page_count_lock. Hence convert these
>>> variable to atomic to avoid readers potentially seeing a store tear.
>>
>> So, this is just theoretical issue or splat from sanitizer.
>> After boot memory online\offline are strictly serialized by rw-semaphore.
>
> Few instances which can race with hot add. Please see below,
> https://patchwork.kernel.org/patch/10627521/
Could you point what exactly are you fixing with this set?
from v2:
> totalram_pages, zone->managed_pages and totalhigh_pages updates
> are protected by managed_page_count_lock, but readers never care
> about it. Convert these variables to atomic to avoid readers
> potentially seeing a store tear.
This?
Aligned unsigned long almost always stored at once.
To make it completely correct you could replace
a += b;
with
WRITE_ONCE(a, a + b);
>
> Regards,
> Arun
>
>>
>>>
>>> Will update the comment.
>>>
>>> Regards,
>>> Arun
>>>
>>>>
>>>> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
>>>>
>>>>>
>>>>> Regards,
>>>>> Arun
>>>>>
>>>>> On 2018-10-26 16:30, Arun KS wrote:
>>>>>> This series convert totalram_pages, totalhigh_pages and
>>>>>> zone->managed_pages to atomic variables.
>>>>>>
>>>>>> The patch was comiple tested on x86(x86_64_defconfig & i386_defconfig)
>>>>>> on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
>>>>>> older version of kernel.
>>>>>>
>>>>>> Arun KS (4):
>>>>>> mm: Fix multiple evaluvations of totalram_pages and managed_pages
>>>>>> mm: Convert zone->managed_pages to atomic variable
>>>>>> mm: convert totalram_pages and totalhigh_pages variables to atomic
>>>>>> mm: Remove managed_page_count spinlock
>>>>>>
>>>>>> arch/csky/mm/init.c | 4 +-
>>>>>> arch/powerpc/platforms/pseries/cmm.c | 10 ++--
>>>>>> arch/s390/mm/init.c | 2 +-
>>>>>> arch/um/kernel/mem.c | 3 +-
>>>>>> arch/x86/kernel/cpu/microcode/core.c | 5 +-
>>>>>> drivers/char/agp/backend.c | 4 +-
>>>>>> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
>>>>>> drivers/gpu/drm/i915/i915_gem.c | 2 +-
>>>>>> drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
>>>>>> drivers/hv/hv_balloon.c | 19 +++----
>>>>>> drivers/md/dm-bufio.c | 2 +-
>>>>>> drivers/md/dm-crypt.c | 2 +-
>>>>>> drivers/md/dm-integrity.c | 2 +-
>>>>>> drivers/md/dm-stats.c | 2 +-
>>>>>> drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
>>>>>> drivers/misc/vmw_balloon.c | 2 +-
>>>>>> drivers/parisc/ccio-dma.c | 4 +-
>>>>>> drivers/parisc/sba_iommu.c | 4 +-
>>>>>> drivers/staging/android/ion/ion_system_heap.c | 2 +-
>>>>>> drivers/xen/xen-selfballoon.c | 6 +--
>>>>>> fs/ceph/super.h | 2 +-
>>>>>> fs/file_table.c | 7 +--
>>>>>> fs/fuse/inode.c | 2 +-
>>>>>> fs/nfs/write.c | 2 +-
>>>>>> fs/nfsd/nfscache.c | 2 +-
>>>>>> fs/ntfs/malloc.h | 2 +-
>>>>>> fs/proc/base.c | 2 +-
>>>>>> include/linux/highmem.h | 28 ++++++++++-
>>>>>> include/linux/mm.h | 27 +++++++++-
>>>>>> include/linux/mmzone.h | 15 +++---
>>>>>> include/linux/swap.h | 1 -
>>>>>> kernel/fork.c | 5 +-
>>>>>> kernel/kexec_core.c | 5 +-
>>>>>> kernel/power/snapshot.c | 2 +-
>>>>>> lib/show_mem.c | 2 +-
>>>>>> mm/highmem.c | 4 +-
>>>>>> mm/huge_memory.c | 2 +-
>>>>>> mm/kasan/quarantine.c | 2 +-
>>>>>> mm/memblock.c | 6 +--
>>>>>> mm/memory_hotplug.c | 4 +-
>>>>>> mm/mm_init.c | 2 +-
>>>>>> mm/oom_kill.c | 2 +-
>>>>>> mm/page_alloc.c | 71 +++++++++++++--------------
>>>>>> mm/shmem.c | 7 +--
>>>>>> mm/slab.c | 2 +-
>>>>>> mm/swap.c | 2 +-
>>>>>> mm/util.c | 2 +-
>>>>>> mm/vmalloc.c | 4 +-
>>>>>> mm/vmstat.c | 4 +-
>>>>>> mm/workingset.c | 2 +-
>>>>>> mm/zswap.c | 4 +-
>>>>>> net/dccp/proto.c | 7 +--
>>>>>> net/decnet/dn_route.c | 2 +-
>>>>>> net/ipv4/tcp_metrics.c | 2 +-
>>>>>> net/netfilter/nf_conntrack_core.c | 7 +--
>>>>>> net/netfilter/xt_hashlimit.c | 5 +-
>>>>>> net/sctp/protocol.c | 7 +--
>>>>>> security/integrity/ima/ima_kexec.c | 2 +-
>>>>>> 58 files changed, 195 insertions(+), 144 deletions(-)
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-07 7:02 ` Konstantin Khlebnikov
@ 2018-11-07 8:50 ` Vlastimil Babka
2018-11-07 10:28 ` Michal Hocko
0 siblings, 1 reply; 20+ messages in thread
From: Vlastimil Babka @ 2018-11-07 8:50 UTC (permalink / raw)
To: Konstantin Khlebnikov, Arun KS
Cc: keescook, minchan, getarunks, gregkh, akpm, mhocko, linux-kernel,
linux-mm, julia.lawall
On 11/7/18 8:02 AM, Konstantin Khlebnikov wrote:
> On 06.11.2018 11:43, Arun KS wrote:
>> On 2018-11-06 14:07, Konstantin Khlebnikov wrote:
>>> On 06.11.2018 11:30, Arun KS wrote:
>>>> On 2018-11-06 13:47, Konstantin Khlebnikov wrote:
>>>>> On 06.11.2018 8:38, Arun KS wrote:
>>>>>> Any comments?
>>>>>
>>>>> Looks good.
>>>>> Except unclear motivation behind this change.
>>>>> This should be in comment of one of patch.
>>>>
>>>> totalram_pages, zone->managed_pages and totalhigh_pages are sometimes modified outside managed_page_count_lock. Hence convert these
>>>> variable to atomic to avoid readers potentially seeing a store tear.
>>>
>>> So, this is just theoretical issue or splat from sanitizer.
>>> After boot memory online\offline are strictly serialized by rw-semaphore.
>>
>> Few instances which can race with hot add. Please see below,
>> https://patchwork.kernel.org/patch/10627521/
> Could you point what exactly are you fixing with this set?
>
> from v2:
>
> > totalram_pages, zone->managed_pages and totalhigh_pages updates
> > are protected by managed_page_count_lock, but readers never care
> > about it. Convert these variables to atomic to avoid readers
> > potentially seeing a store tear.
>
> This?
>
>
> Aligned unsigned long almost always stored at once.
The point is "almost always", so better not rely on it :) But the main
motivation was that managed_page_count_lock handling was complicating
Arun's "memory_hotplug: Free pages as higher order" patch and it seemed
a better idea to just remove and convert this to atomics, with
preventing potential store-to-read tearing as a bonus.
It would be nice to mention it in the changelogs though.
> To make it completely correct you could replace
>
> a += b;
>
> with
>
> WRITE_ONCE(a, a + b);
Wouldn't be enough to get rid of the locks.
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-07 8:50 ` Vlastimil Babka
@ 2018-11-07 10:28 ` Michal Hocko
2018-11-07 10:39 ` Michal Hocko
0 siblings, 1 reply; 20+ messages in thread
From: Michal Hocko @ 2018-11-07 10:28 UTC (permalink / raw)
To: Vlastimil Babka
Cc: Konstantin Khlebnikov, Arun KS, keescook, minchan, getarunks,
gregkh, akpm, linux-kernel, linux-mm, julia.lawall
On Wed 07-11-18 09:50:10, Vlastimil Babka wrote:
> On 11/7/18 8:02 AM, Konstantin Khlebnikov wrote:
[...]
> > Could you point what exactly are you fixing with this set?
> >
> > from v2:
> >
> > > totalram_pages, zone->managed_pages and totalhigh_pages updates
> > > are protected by managed_page_count_lock, but readers never care
> > > about it. Convert these variables to atomic to avoid readers
> > > potentially seeing a store tear.
> >
> > This?
> >
> >
> > Aligned unsigned long almost always stored at once.
>
> The point is "almost always", so better not rely on it :) But the main
> motivation was that managed_page_count_lock handling was complicating
> Arun's "memory_hotplug: Free pages as higher order" patch and it seemed
> a better idea to just remove and convert this to atomics, with
> preventing potential store-to-read tearing as a bonus.
And more importantly the lock itself seems bogus as mentioned here
http://lkml.kernel.org/r/20181106141732.GR27423@dhcp22.suse.cz
> It would be nice to mention it in the changelogs though.
agreed
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 4/4] mm: Remove managed_page_count spinlock
[not found] ` <20181106141732.GR27423@dhcp22.suse.cz>
@ 2018-11-07 10:36 ` Michal Hocko
0 siblings, 0 replies; 20+ messages in thread
From: Michal Hocko @ 2018-11-07 10:36 UTC (permalink / raw)
To: Arun KS
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
[for some reason I have dropped the rest of the cc list. Restored]
On Tue 06-11-18 15:17:32, Michal Hocko wrote:
> On Fri 26-10-18 16:31:02, Arun KS wrote:
> > Now totalram_pages and managed_pages are atomic varibles. No need
> > of managed_page_count spinlock.
>
> Yes this is the real improvement. The lock had really a weak consistency
> guarantee. It hasn't been used for anything but the update but no reader
> actually cares about all the values being updated to be in sync. I
> haven't really done an excavation work to see whether it used to be used
> in other contexts in the past but it simply doesn't have any meaning
> anymore.
>
> > Signed-off-by: Arun KS <arunks@codeaurora.org>
>
> Acked-by: Michal Hocko <mhocko@suse.com>
>
> Thanks for getting through all the hassles to reach to this end point.
>
> > ---
> > include/linux/mmzone.h | 6 ------
> > mm/page_alloc.c | 5 -----
> > 2 files changed, 11 deletions(-)
> >
> > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> > index 597b0c7..aa960f6 100644
> > --- a/include/linux/mmzone.h
> > +++ b/include/linux/mmzone.h
> > @@ -428,12 +428,6 @@ struct zone {
> > * Write access to present_pages at runtime should be protected by
> > * mem_hotplug_begin/end(). Any reader who can't tolerant drift of
> > * present_pages should get_online_mems() to get a stable value.
> > - *
> > - * Read access to managed_pages should be safe because it's unsigned
> > - * long. Write access to zone->managed_pages and totalram_pages are
> > - * protected by managed_page_count_lock at runtime. Idealy only
> > - * adjust_managed_page_count() should be used instead of directly
> > - * touching zone->managed_pages and totalram_pages.
> > */
> > atomic_long_t managed_pages;
> > unsigned long spanned_pages;
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index af832de..e29e78f 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -122,9 +122,6 @@
> > };
> > EXPORT_SYMBOL(node_states);
> >
> > -/* Protect totalram_pages and zone->managed_pages */
> > -static DEFINE_SPINLOCK(managed_page_count_lock);
> > -
> > atomic_long_t _totalram_pages __read_mostly;
> > unsigned long totalreserve_pages __read_mostly;
> > unsigned long totalcma_pages __read_mostly;
> > @@ -7062,14 +7059,12 @@ static int __init cmdline_parse_movablecore(char *p)
> >
> > void adjust_managed_page_count(struct page *page, long count)
> > {
> > - spin_lock(&managed_page_count_lock);
> > atomic_long_add(count, &page_zone(page)->managed_pages);
> > totalram_pages_add(count);
> > #ifdef CONFIG_HIGHMEM
> > if (PageHighMem(page))
> > totalhigh_pages_add(count);
> > #endif
> > - spin_unlock(&managed_page_count_lock);
> > }
> > EXPORT_SYMBOL(adjust_managed_page_count);
> >
> > --
> > 1.9.1
>
> --
> Michal Hocko
> SUSE Labs
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 3/4] mm: convert totalram_pages and totalhigh_pages variables to atomic
[not found] ` <20181106141438.GQ27423@dhcp22.suse.cz>
@ 2018-11-07 10:38 ` Michal Hocko
0 siblings, 0 replies; 20+ messages in thread
From: Michal Hocko @ 2018-11-07 10:38 UTC (permalink / raw)
To: Arun KS
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
vbabka, linux-kernel, linux-mm, Arun KS
[For some reason I've dropped the CC list]
On Tue 06-11-18 15:14:38, Michal Hocko wrote:
> On Fri 26-10-18 16:31:01, Arun KS wrote:
> > totalram_pages and totalhigh_pages are made static inline function.
> >
> > Suggested-by: Michal Hocko <mhocko@suse.com>
> > Suggested-by: Vlastimil Babka <vbabka@suse.cz>
> > Signed-off-by: Arun KS <arunks@codeaurora.org>
>
> Same as with the previous one.
>
> Acked-by: Michal Hocko <mhocko@suse.com>
>
> > ---
> > coccinelle script to make most of the changes,
> >
> > @@
> > declarer name EXPORT_SYMBOL;
> > symbol totalram_pages;
> > expression e;
> > @@
> > (
> > EXPORT_SYMBOL(totalram_pages);
> > |
> > - totalram_pages = e
> > + totalram_pages_set(e)
> > |
> > - totalram_pages += e
> > + totalram_pages_add(e)
> > |
> > - totalram_pages++
> > + totalram_pages_inc()
> > |
> > - totalram_pages--
> > + totalram_pages_dec()
> > |
> > - totalram_pages
> > + totalram_pages()
> > )
> >
> > @@
> > symbol totalhigh_pages;
> > expression e;
> > @@
> > (
> > EXPORT_SYMBOL(totalhigh_pages);
> > |
> > - totalhigh_pages = e
> > + totalhigh_pages_set(e)
> > |
> > - totalhigh_pages += e
> > + totalhigh_pages_add(e)
> > |
> > - totalhigh_pages++
> > + totalhigh_pages_inc()
> > |
> > - totalhigh_pages--
> > + totalhigh_pages_dec()
> > |
> > - totalhigh_pages
> > + totalhigh_pages()
> > )
> >
> > Manaually apply all changes of following files,
> >
> > include/linux/highmem.h
> > include/linux/mm.h
> > include/linux/swap.h
> > mm/highmem.c
> >
> > and for mm/page_alloc.c mannualy apply only below changes,
> >
> > #include <linux/stddef.h>
> > #include <linux/mm.h>
> > +#include <linux/highmem.h>
> > #include <linux/swap.h>
> > #include <linux/interrupt.h>
> > #include <linux/pagemap.h>
> >
> > /* Protect totalram_pages and zone->managed_pages */
> > static DEFINE_SPINLOCK(managed_page_count_lock);
> >
> > -unsigned long totalram_pages __read_mostly;
> > +atomic_long_t _totalram_pages __read_mostly;
> > unsigned long totalreserve_pages __read_mostly;
> > unsigned long totalcma_pages __read_mostly;
> > ---
> > arch/csky/mm/init.c | 4 ++--
> > arch/powerpc/platforms/pseries/cmm.c | 10 +++++-----
> > arch/s390/mm/init.c | 2 +-
> > arch/um/kernel/mem.c | 2 +-
> > arch/x86/kernel/cpu/microcode/core.c | 2 +-
> > drivers/char/agp/backend.c | 4 ++--
> > drivers/gpu/drm/i915/i915_gem.c | 2 +-
> > drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 ++--
> > drivers/hv/hv_balloon.c | 2 +-
> > drivers/md/dm-bufio.c | 2 +-
> > drivers/md/dm-crypt.c | 2 +-
> > drivers/md/dm-integrity.c | 2 +-
> > drivers/md/dm-stats.c | 2 +-
> > drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
> > drivers/misc/vmw_balloon.c | 2 +-
> > drivers/parisc/ccio-dma.c | 4 ++--
> > drivers/parisc/sba_iommu.c | 4 ++--
> > drivers/staging/android/ion/ion_system_heap.c | 2 +-
> > drivers/xen/xen-selfballoon.c | 6 +++---
> > fs/ceph/super.h | 2 +-
> > fs/file_table.c | 2 +-
> > fs/fuse/inode.c | 2 +-
> > fs/nfs/write.c | 2 +-
> > fs/nfsd/nfscache.c | 2 +-
> > fs/ntfs/malloc.h | 2 +-
> > fs/proc/base.c | 2 +-
> > include/linux/highmem.h | 28 +++++++++++++++++++++++++--
> > include/linux/mm.h | 27 +++++++++++++++++++++++++-
> > include/linux/swap.h | 1 -
> > kernel/fork.c | 2 +-
> > kernel/kexec_core.c | 2 +-
> > kernel/power/snapshot.c | 2 +-
> > mm/highmem.c | 4 +---
> > mm/huge_memory.c | 2 +-
> > mm/kasan/quarantine.c | 2 +-
> > mm/memblock.c | 4 ++--
> > mm/memory_hotplug.c | 4 ++--
> > mm/mm_init.c | 2 +-
> > mm/oom_kill.c | 2 +-
> > mm/page_alloc.c | 19 +++++++++---------
> > mm/shmem.c | 8 ++++----
> > mm/slab.c | 2 +-
> > mm/swap.c | 2 +-
> > mm/util.c | 2 +-
> > mm/vmalloc.c | 4 ++--
> > mm/workingset.c | 2 +-
> > mm/zswap.c | 4 ++--
> > net/dccp/proto.c | 2 +-
> > net/decnet/dn_route.c | 2 +-
> > net/ipv4/tcp_metrics.c | 2 +-
> > net/netfilter/nf_conntrack_core.c | 2 +-
> > net/netfilter/xt_hashlimit.c | 2 +-
> > security/integrity/ima/ima_kexec.c | 2 +-
> > 53 files changed, 129 insertions(+), 82 deletions(-)
> >
> > diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
> > index dc07c07..66e5970 100644
> > --- a/arch/csky/mm/init.c
> > +++ b/arch/csky/mm/init.c
> > @@ -71,7 +71,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
> > ClearPageReserved(virt_to_page(start));
> > init_page_count(virt_to_page(start));
> > free_page(start);
> > - totalram_pages++;
> > + totalram_pages_inc();
> > }
> > }
> > #endif
> > @@ -88,7 +88,7 @@ void free_initmem(void)
> > ClearPageReserved(virt_to_page(addr));
> > init_page_count(virt_to_page(addr));
> > free_page(addr);
> > - totalram_pages++;
> > + totalram_pages_inc();
> > addr += PAGE_SIZE;
> > }
> >
> > diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
> > index 25427a4..e8d63a6 100644
> > --- a/arch/powerpc/platforms/pseries/cmm.c
> > +++ b/arch/powerpc/platforms/pseries/cmm.c
> > @@ -208,7 +208,7 @@ static long cmm_alloc_pages(long nr)
> >
> > pa->page[pa->index++] = addr;
> > loaned_pages++;
> > - totalram_pages--;
> > + totalram_pages_dec();
> > spin_unlock(&cmm_lock);
> > nr--;
> > }
> > @@ -247,7 +247,7 @@ static long cmm_free_pages(long nr)
> > free_page(addr);
> > loaned_pages--;
> > nr--;
> > - totalram_pages++;
> > + totalram_pages_inc();
> > }
> > spin_unlock(&cmm_lock);
> > cmm_dbg("End request with %ld pages unfulfilled\n", nr);
> > @@ -291,7 +291,7 @@ static void cmm_get_mpp(void)
> > int rc;
> > struct hvcall_mpp_data mpp_data;
> > signed long active_pages_target, page_loan_request, target;
> > - signed long total_pages = totalram_pages + loaned_pages;
> > + signed long total_pages = totalram_pages() + loaned_pages;
> > signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE;
> >
> > rc = h_get_mpp(&mpp_data);
> > @@ -322,7 +322,7 @@ static void cmm_get_mpp(void)
> >
> > cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = %lu\n",
> > page_loan_request, loaned_pages, loaned_pages_target,
> > - oom_freed_pages, totalram_pages);
> > + oom_freed_pages, totalram_pages());
> > }
> >
> > static struct notifier_block cmm_oom_nb = {
> > @@ -581,7 +581,7 @@ static int cmm_mem_going_offline(void *arg)
> > free_page(pa_curr->page[idx]);
> > freed++;
> > loaned_pages--;
> > - totalram_pages++;
> > + totalram_pages_inc();
> > pa_curr->page[idx] = pa_last->page[--pa_last->index];
> > if (pa_last->index == 0) {
> > if (pa_curr == pa_last)
> > diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
> > index 76d0708..5038819 100644
> > --- a/arch/s390/mm/init.c
> > +++ b/arch/s390/mm/init.c
> > @@ -59,7 +59,7 @@ static void __init setup_zero_pages(void)
> > order = 7;
> >
> > /* Limit number of empty zero pages for small memory sizes */
> > - while (order > 2 && (totalram_pages >> 10) < (1UL << order))
> > + while (order > 2 && (totalram_pages() >> 10) < (1UL << order))
> > order--;
> >
> > empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
> > diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
> > index 134d3fd..64b62a8 100644
> > --- a/arch/um/kernel/mem.c
> > +++ b/arch/um/kernel/mem.c
> > @@ -51,7 +51,7 @@ void __init mem_init(void)
> >
> > /* this will put all low memory onto the freelists */
> > memblock_free_all();
> > - max_pfn = max_low_pfn = totalram_pages;
> > + max_pfn = max_low_pfn = totalram_pages();
> > mem_init_print_info(NULL);
> > kmalloc_ok = 1;
> > }
> > diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
> > index 99c67ca..8594641 100644
> > --- a/arch/x86/kernel/cpu/microcode/core.c
> > +++ b/arch/x86/kernel/cpu/microcode/core.c
> > @@ -434,7 +434,7 @@ static ssize_t microcode_write(struct file *file, const char __user *buf,
> > size_t len, loff_t *ppos)
> > {
> > ssize_t ret = -EINVAL;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> >
> > if ((len >> PAGE_SHIFT) > totalram_pgs) {
> > pr_err("too much data (max %ld pages)\n", totalram_pgs);
> > diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
> > index 38ffb28..004a3ce 100644
> > --- a/drivers/char/agp/backend.c
> > +++ b/drivers/char/agp/backend.c
> > @@ -115,9 +115,9 @@ static int agp_find_max(void)
> > long memory, index, result;
> >
> > #if PAGE_SHIFT < 20
> > - memory = totalram_pages >> (20 - PAGE_SHIFT);
> > + memory = totalram_pages() >> (20 - PAGE_SHIFT);
> > #else
> > - memory = totalram_pages << (PAGE_SHIFT - 20);
> > + memory = totalram_pages() << (PAGE_SHIFT - 20);
> > #endif
> > index = 1;
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> > index 0c8aa57..6ed0e75 100644
> > --- a/drivers/gpu/drm/i915/i915_gem.c
> > +++ b/drivers/gpu/drm/i915/i915_gem.c
> > @@ -2539,7 +2539,7 @@ static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
> > * If there's no chance of allocating enough pages for the whole
> > * object, bail early.
> > */
> > - if (page_count > totalram_pages)
> > + if (page_count > totalram_pages())
> > return -ENOMEM;
> >
> > st = kmalloc(sizeof(*st), GFP_KERNEL);
> > diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> > index 8e2e269..91a8fa4 100644
> > --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> > @@ -170,7 +170,7 @@ static int igt_ppgtt_alloc(void *arg)
> > * This should ensure that we do not run into the oomkiller during
> > * the test and take down the machine wilfully.
> > */
> > - limit = totalram_pages << PAGE_SHIFT;
> > + limit = totalram_pages() << PAGE_SHIFT;
> > limit = min(ppgtt->vm.total, limit);
> >
> > /* Check we can allocate the entire range */
> > @@ -1244,7 +1244,7 @@ static int exercise_mock(struct drm_i915_private *i915,
> > u64 hole_start, u64 hole_end,
> > unsigned long end_time))
> > {
> > - const u64 limit = totalram_pages << PAGE_SHIFT;
> > + const u64 limit = totalram_pages() << PAGE_SHIFT;
> > struct i915_gem_context *ctx;
> > struct i915_hw_ppgtt *ppgtt;
> > IGT_TIMEOUT(end_time);
> > diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> > index 2a60f9a..94b3d66 100644
> > --- a/drivers/hv/hv_balloon.c
> > +++ b/drivers/hv/hv_balloon.c
> > @@ -1092,7 +1092,7 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg)
> > static unsigned long compute_balloon_floor(void)
> > {
> > unsigned long min_pages;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> > #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
> > /* Simple continuous piecewiese linear function:
> > * max MiB -> min MiB gradient
> > diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
> > index dc385b7..8b0b628 100644
> > --- a/drivers/md/dm-bufio.c
> > +++ b/drivers/md/dm-bufio.c
> > @@ -1887,7 +1887,7 @@ static int __init dm_bufio_init(void)
> > dm_bufio_allocated_vmalloc = 0;
> > dm_bufio_current_allocated = 0;
> >
> > - mem = (__u64)mult_frac(totalram_pages - totalhigh_pages,
> > + mem = (__u64)mult_frac(totalram_pages() - totalhigh_pages(),
> > DM_BUFIO_MEMORY_PERCENT, 100) << PAGE_SHIFT;
> >
> > if (mem > ULONG_MAX)
> > diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
> > index 0481223..62f2e92 100644
> > --- a/drivers/md/dm-crypt.c
> > +++ b/drivers/md/dm-crypt.c
> > @@ -2158,7 +2158,7 @@ static int crypt_wipe_key(struct crypt_config *cc)
> >
> > static void crypt_calculate_pages_per_client(void)
> > {
> > - unsigned long pages = (totalram_pages - totalhigh_pages) * DM_CRYPT_MEMORY_PERCENT / 100;
> > + unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100;
> >
> > if (!dm_crypt_clients_n)
> > return;
> > diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
> > index bb3096b..c12fa01 100644
> > --- a/drivers/md/dm-integrity.c
> > +++ b/drivers/md/dm-integrity.c
> > @@ -2843,7 +2843,7 @@ static int create_journal(struct dm_integrity_c *ic, char **error)
> > journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
> > PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
> > journal_desc_size = journal_pages * sizeof(struct page_list);
> > - if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) {
> > + if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
> > *error = "Journal doesn't fit into memory";
> > r = -ENOMEM;
> > goto bad;
> > diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
> > index 21de30b..45b92a3 100644
> > --- a/drivers/md/dm-stats.c
> > +++ b/drivers/md/dm-stats.c
> > @@ -85,7 +85,7 @@ static bool __check_shared_memory(size_t alloc_size)
> > a = shared_memory_amount + alloc_size;
> > if (a < shared_memory_amount)
> > return false;
> > - if (a >> PAGE_SHIFT > totalram_pages / DM_STATS_MEMORY_FACTOR)
> > + if (a >> PAGE_SHIFT > totalram_pages() / DM_STATS_MEMORY_FACTOR)
> > return false;
> > #ifdef CONFIG_MMU
> > if (a > (VMALLOC_END - VMALLOC_START) / DM_STATS_VMALLOC_FACTOR)
> > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > index 616f78b..b660249 100644
> > --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> > @@ -855,7 +855,7 @@ static int mtk_vpu_probe(struct platform_device *pdev)
> > /* Set PTCM to 96K and DTCM to 32K */
> > vpu_cfg_writel(vpu, 0x2, VPU_TCM_CFG);
> >
> > - vpu->enable_4GB = !!(totalram_pages > (SZ_2G >> PAGE_SHIFT));
> > + vpu->enable_4GB = !!(totalram_pages() > (SZ_2G >> PAGE_SHIFT));
> > dev_info(dev, "4GB mode %u\n", vpu->enable_4GB);
> >
> > if (vpu->enable_4GB) {
> > diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
> > index 9b0b3fa..e6126a4 100644
> > --- a/drivers/misc/vmw_balloon.c
> > +++ b/drivers/misc/vmw_balloon.c
> > @@ -570,7 +570,7 @@ static int vmballoon_send_get_target(struct vmballoon *b)
> > unsigned long status;
> > unsigned long limit;
> >
> > - limit = totalram_pages;
> > + limit = totalram_pages();
> >
> > /* Ensure limit fits in 32-bits */
> > if (limit != (u32)limit)
> > diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
> > index 6148236..067cbaf 100644
> > --- a/drivers/parisc/ccio-dma.c
> > +++ b/drivers/parisc/ccio-dma.c
> > @@ -1255,7 +1255,7 @@ void __init ccio_cujo20_fixup(struct parisc_device *cujo, u32 iovp)
> > ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
> > */
> >
> > - iova_space_size = (u32) (totalram_pages / count_parisc_driver(&ccio_driver));
> > + iova_space_size = (u32) (totalram_pages() / count_parisc_driver(&ccio_driver));
> >
> > /* limit IOVA space size to 1MB-1GB */
> >
> > @@ -1294,7 +1294,7 @@ void __init ccio_cujo20_fixup(struct parisc_device *cujo, u32 iovp)
> >
> > DBG_INIT("%s() hpa 0x%p mem %luMB IOV %dMB (%d bits)\n",
> > __func__, ioc->ioc_regs,
> > - (unsigned long) totalram_pages >> (20 - PAGE_SHIFT),
> > + (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
> > iova_space_size>>20,
> > iov_order + PAGE_SHIFT);
> >
> > diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
> > index 11de0ec..b61ae31 100644
> > --- a/drivers/parisc/sba_iommu.c
> > +++ b/drivers/parisc/sba_iommu.c
> > @@ -1419,7 +1419,7 @@ static int setup_ibase_imask_callback(struct device *dev, void *data)
> > ** for DMA hints - ergo only 30 bits max.
> > */
> >
> > - iova_space_size = (u32) (totalram_pages/global_ioc_cnt);
> > + iova_space_size = (u32) (totalram_pages()/global_ioc_cnt);
> >
> > /* limit IOVA space size to 1MB-1GB */
> > if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
> > @@ -1444,7 +1444,7 @@ static int setup_ibase_imask_callback(struct device *dev, void *data)
> > DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n",
> > __func__,
> > ioc->ioc_hpa,
> > - (unsigned long) totalram_pages >> (20 - PAGE_SHIFT),
> > + (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT),
> > iova_space_size>>20,
> > iov_order + PAGE_SHIFT);
> >
> > diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
> > index 548bb02..6cb0eeb 100644
> > --- a/drivers/staging/android/ion/ion_system_heap.c
> > +++ b/drivers/staging/android/ion/ion_system_heap.c
> > @@ -110,7 +110,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
> > unsigned long size_remaining = PAGE_ALIGN(size);
> > unsigned int max_order = orders[0];
> >
> > - if (size / PAGE_SIZE > totalram_pages / 2)
> > + if (size / PAGE_SIZE > totalram_pages() / 2)
> > return -ENOMEM;
> >
> > INIT_LIST_HEAD(&pages);
> > diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
> > index 5165aa8..246f612 100644
> > --- a/drivers/xen/xen-selfballoon.c
> > +++ b/drivers/xen/xen-selfballoon.c
> > @@ -189,7 +189,7 @@ static void selfballoon_process(struct work_struct *work)
> > bool reset_timer = false;
> >
> > if (xen_selfballooning_enabled) {
> > - cur_pages = totalram_pages;
> > + cur_pages = totalram_pages();
> > tgt_pages = cur_pages; /* default is no change */
> > goal_pages = vm_memory_committed() +
> > totalreserve_pages +
> > @@ -227,7 +227,7 @@ static void selfballoon_process(struct work_struct *work)
> > if (tgt_pages < floor_pages)
> > tgt_pages = floor_pages;
> > balloon_set_new_target(tgt_pages +
> > - balloon_stats.current_pages - totalram_pages);
> > + balloon_stats.current_pages - totalram_pages());
> > reset_timer = true;
> > }
> > #ifdef CONFIG_FRONTSWAP
> > @@ -569,7 +569,7 @@ int xen_selfballoon_init(bool use_selfballooning, bool use_frontswap_selfshrink)
> > * much more reliably and response faster in some cases.
> > */
> > if (!selfballoon_reserved_mb) {
> > - reserve_pages = totalram_pages / 10;
> > + reserve_pages = totalram_pages() / 10;
> > selfballoon_reserved_mb = PAGES2MB(reserve_pages);
> > }
> > schedule_delayed_work(&selfballoon_worker, selfballoon_interval * HZ);
> > diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> > index 582e28f..5d6659c 100644
> > --- a/fs/ceph/super.h
> > +++ b/fs/ceph/super.h
> > @@ -807,7 +807,7 @@ static inline int default_congestion_kb(void)
> > * This allows larger machines to have larger/more transfers.
> > * Limit the default to 256M
> > */
> > - congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
> > + congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10);
> > if (congestion_kb > 256*1024)
> > congestion_kb = 256*1024;
> >
> > diff --git a/fs/file_table.c b/fs/file_table.c
> > index 5d36655..ec1633b 100644
> > --- a/fs/file_table.c
> > +++ b/fs/file_table.c
> > @@ -383,7 +383,7 @@ void __init files_init(void)
> > void __init files_maxfiles_init(void)
> > {
> > unsigned long n;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> > unsigned long memreserve = (totalram_pgs - nr_free_pages()) * 3/2;
> >
> > memreserve = min(memreserve, totalram_pgs - 1);
> > diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
> > index 4727ef6..f0fe74f 100644
> > --- a/fs/fuse/inode.c
> > +++ b/fs/fuse/inode.c
> > @@ -825,7 +825,7 @@ static struct dentry *fuse_get_parent(struct dentry *child)
> > static void sanitize_global_limit(unsigned *limit)
> > {
> > if (*limit == 0)
> > - *limit = ((totalram_pages << PAGE_SHIFT) >> 13) /
> > + *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) /
> > sizeof(struct fuse_req);
> >
> > if (*limit >= 1 << 16)
> > diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> > index 586726a..4f15665 100644
> > --- a/fs/nfs/write.c
> > +++ b/fs/nfs/write.c
> > @@ -2121,7 +2121,7 @@ int __init nfs_init_writepagecache(void)
> > * This allows larger machines to have larger/more transfers.
> > * Limit the default to 256M
> > */
> > - nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
> > + nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10);
> > if (nfs_congestion_kb > 256*1024)
> > nfs_congestion_kb = 256*1024;
> >
> > diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
> > index e2fe0e9..da52b59 100644
> > --- a/fs/nfsd/nfscache.c
> > +++ b/fs/nfsd/nfscache.c
> > @@ -99,7 +99,7 @@ static unsigned long nfsd_reply_cache_scan(struct shrinker *shrink,
> > nfsd_cache_size_limit(void)
> > {
> > unsigned int limit;
> > - unsigned long low_pages = totalram_pages - totalhigh_pages;
> > + unsigned long low_pages = totalram_pages() - totalhigh_pages();
> >
> > limit = (16 * int_sqrt(low_pages)) << (PAGE_SHIFT-10);
> > return min_t(unsigned int, limit, 256*1024);
> > diff --git a/fs/ntfs/malloc.h b/fs/ntfs/malloc.h
> > index ab172e5..5becc8a 100644
> > --- a/fs/ntfs/malloc.h
> > +++ b/fs/ntfs/malloc.h
> > @@ -47,7 +47,7 @@ static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
> > return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
> > /* return (void *)__get_free_page(gfp_mask); */
> > }
> > - if (likely((size >> PAGE_SHIFT) < totalram_pages))
> > + if (likely((size >> PAGE_SHIFT) < totalram_pages()))
> > return __vmalloc(size, gfp_mask, PAGE_KERNEL);
> > return NULL;
> > }
> > diff --git a/fs/proc/base.c b/fs/proc/base.c
> > index ce34654..d7fd1ca 100644
> > --- a/fs/proc/base.c
> > +++ b/fs/proc/base.c
> > @@ -530,7 +530,7 @@ static ssize_t lstats_write(struct file *file, const char __user *buf,
> > static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
> > struct pid *pid, struct task_struct *task)
> > {
> > - unsigned long totalpages = totalram_pages + total_swap_pages;
> > + unsigned long totalpages = totalram_pages() + total_swap_pages;
> > unsigned long points = 0;
> >
> > points = oom_badness(task, NULL, NULL, totalpages) *
> > diff --git a/include/linux/highmem.h b/include/linux/highmem.h
> > index 0690679..cea3a01 100644
> > --- a/include/linux/highmem.h
> > +++ b/include/linux/highmem.h
> > @@ -36,7 +36,31 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
> >
> > /* declarations for linux/mm/highmem.c */
> > unsigned int nr_free_highpages(void);
> > -extern unsigned long totalhigh_pages;
> > +extern atomic_long_t _totalhigh_pages;
> > +static inline unsigned long totalhigh_pages(void)
> > +{
> > + return (unsigned long)atomic_long_read(&_totalhigh_pages);
> > +}
> > +
> > +static inline void totalhigh_pages_inc(void)
> > +{
> > + atomic_long_inc(&_totalhigh_pages);
> > +}
> > +
> > +static inline void totalhigh_pages_dec(void)
> > +{
> > + atomic_long_dec(&_totalhigh_pages);
> > +}
> > +
> > +static inline void totalhigh_pages_add(long count)
> > +{
> > + atomic_long_add(count, &_totalhigh_pages);
> > +}
> > +
> > +static inline void totalhigh_pages_set(long val)
> > +{
> > + atomic_long_set(&_totalhigh_pages, val);
> > +}
> >
> > void kmap_flush_unused(void);
> >
> > @@ -51,7 +75,7 @@ static inline struct page *kmap_to_page(void *addr)
> > return virt_to_page(addr);
> > }
> >
> > -#define totalhigh_pages 0UL
> > +static inline unsigned long totalhigh_pages(void) { return 0UL; }
> >
> > #ifndef ARCH_HAS_KMAP
> > static inline void *kmap(struct page *page)
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index fcf9cc9..d2c1646 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -48,7 +48,32 @@ static inline void set_max_mapnr(unsigned long limit)
> > static inline void set_max_mapnr(unsigned long limit) { }
> > #endif
> >
> > -extern unsigned long totalram_pages;
> > +extern atomic_long_t _totalram_pages;
> > +static inline unsigned long totalram_pages(void)
> > +{
> > + return (unsigned long)atomic_long_read(&_totalram_pages);
> > +}
> > +
> > +static inline void totalram_pages_inc(void)
> > +{
> > + atomic_long_inc(&_totalram_pages);
> > +}
> > +
> > +static inline void totalram_pages_dec(void)
> > +{
> > + atomic_long_dec(&_totalram_pages);
> > +}
> > +
> > +static inline void totalram_pages_add(long count)
> > +{
> > + atomic_long_add(count, &_totalram_pages);
> > +}
> > +
> > +static inline void totalram_pages_set(long val)
> > +{
> > + atomic_long_set(&_totalram_pages, val);
> > +}
> > +
> > extern void * high_memory;
> > extern int page_cluster;
> >
> > diff --git a/include/linux/swap.h b/include/linux/swap.h
> > index d098743..80d0ab6 100644
> > --- a/include/linux/swap.h
> > +++ b/include/linux/swap.h
> > @@ -309,7 +309,6 @@ struct vma_swap_readahead {
> > } while (0)
> >
> > /* linux/mm/page_alloc.c */
> > -extern unsigned long totalram_pages;
> > extern unsigned long totalreserve_pages;
> > extern unsigned long nr_free_buffer_pages(void);
> > extern unsigned long nr_free_pagecache_pages(void);
> > diff --git a/kernel/fork.c b/kernel/fork.c
> > index 63d57f7..fa524b2 100644
> > --- a/kernel/fork.c
> > +++ b/kernel/fork.c
> > @@ -739,7 +739,7 @@ void __init __weak arch_task_cache_init(void) { }
> > static void set_max_threads(unsigned int max_threads_suggested)
> > {
> > u64 threads;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> >
> > /*
> > * The number of threads shall be limited such that the thread
> > diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> > index dff217c..7c50f56 100644
> > --- a/kernel/kexec_core.c
> > +++ b/kernel/kexec_core.c
> > @@ -152,7 +152,7 @@ int sanity_check_segment_list(struct kimage *image)
> > int i;
> > unsigned long nr_segments = image->nr_segments;
> > unsigned long total_pages = 0;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> >
> > /*
> > * Verify we have good destination addresses. The caller is
> > diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
> > index b0308a2..640b203 100644
> > --- a/kernel/power/snapshot.c
> > +++ b/kernel/power/snapshot.c
> > @@ -105,7 +105,7 @@ void __init hibernate_reserved_size_init(void)
> >
> > void __init hibernate_image_size_init(void)
> > {
> > - image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
> > + image_size = ((totalram_pages() * 2) / 5) * PAGE_SIZE;
> > }
> >
> > /*
> > diff --git a/mm/highmem.c b/mm/highmem.c
> > index 59db322..02a9a4b 100644
> > --- a/mm/highmem.c
> > +++ b/mm/highmem.c
> > @@ -105,9 +105,7 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
> > }
> > #endif
> >
> > -unsigned long totalhigh_pages __read_mostly;
> > -EXPORT_SYMBOL(totalhigh_pages);
> > -
> > +atomic_long_t _totalhigh_pages __read_mostly;
> >
> > EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
> >
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index d394d18..9a36c67 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -420,7 +420,7 @@ static int __init hugepage_init(void)
> > * where the extra memory used could hurt more than TLB overhead
> > * is likely to save. The admin can still enable it through /sys.
> > */
> > - if (totalram_pages < (512 << (20 - PAGE_SHIFT))) {
> > + if (totalram_pages() < (512 << (20 - PAGE_SHIFT))) {
> > transparent_hugepage_flags = 0;
> > return 0;
> > }
> > diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
> > index b209dba..5be4639 100644
> > --- a/mm/kasan/quarantine.c
> > +++ b/mm/kasan/quarantine.c
> > @@ -236,7 +236,7 @@ void quarantine_reduce(void)
> > * Update quarantine size in case of hotplug. Allocate a fraction of
> > * the installed memory to quarantine minus per-cpu queue limits.
> > */
> > - total_size = (READ_ONCE(totalram_pages) << PAGE_SHIFT) /
> > + total_size = (READ_ONCE(totalram_pages()) << PAGE_SHIFT) /
> > QUARANTINE_FRACTION;
> > percpu_quarantines = QUARANTINE_PERCPU_SIZE * num_online_cpus();
> > new_quarantine_size = (total_size < percpu_quarantines) ?
> > diff --git a/mm/memblock.c b/mm/memblock.c
> > index 14a6219..ab089b2 100644
> > --- a/mm/memblock.c
> > +++ b/mm/memblock.c
> > @@ -1627,7 +1627,7 @@ void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
> >
> > for (; cursor < end; cursor++) {
> > memblock_free_pages(pfn_to_page(cursor), cursor, 0);
> > - totalram_pages++;
> > + totalram_pages_inc();
> > }
> > }
> >
> > @@ -2029,7 +2029,7 @@ unsigned long __init memblock_free_all(void)
> > reset_all_zones_managed_pages();
> >
> > pages = free_low_memory_core_early();
> > - totalram_pages += pages;
> > + totalram_pages_add(pages);
> >
> > return pages;
> > }
> > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> > index dbbb945..25b8377 100644
> > --- a/mm/memory_hotplug.c
> > +++ b/mm/memory_hotplug.c
> > @@ -657,10 +657,10 @@ void __online_page_free(struct page *page)
> > static int generic_online_page(struct page *page, unsigned int order)
> > {
> > __free_pages_core(page, order);
> > - totalram_pages += (1UL << order);
> > + totalram_pages_add((1UL << order));
> > #ifdef CONFIG_HIGHMEM
> > if (PageHighMem(page))
> > - totalhigh_pages += (1UL << order);
> > + totalhigh_pages_add((1UL << order));
> > #endif
> > return 0;
> > }
> > diff --git a/mm/mm_init.c b/mm/mm_init.c
> > index 6838a53..3391710 100644
> > --- a/mm/mm_init.c
> > +++ b/mm/mm_init.c
> > @@ -146,7 +146,7 @@ static void __meminit mm_compute_batch(void)
> > s32 batch = max_t(s32, nr*2, 32);
> >
> > /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
> > - memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
> > + memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff);
> >
> > vm_committed_as_batch = max_t(s32, memsized_batch, batch);
> > }
> > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > index 6589f60..21d4877 100644
> > --- a/mm/oom_kill.c
> > +++ b/mm/oom_kill.c
> > @@ -269,7 +269,7 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc)
> > }
> >
> > /* Default to all available memory */
> > - oc->totalpages = totalram_pages + total_swap_pages;
> > + oc->totalpages = totalram_pages() + total_swap_pages;
> >
> > if (!IS_ENABLED(CONFIG_NUMA))
> > return CONSTRAINT_NONE;
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index f077849..af832de 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -16,6 +16,7 @@
> >
> > #include <linux/stddef.h>
> > #include <linux/mm.h>
> > +#include <linux/highmem.h>
> > #include <linux/swap.h>
> > #include <linux/interrupt.h>
> > #include <linux/pagemap.h>
> > @@ -124,7 +125,7 @@
> > /* Protect totalram_pages and zone->managed_pages */
> > static DEFINE_SPINLOCK(managed_page_count_lock);
> >
> > -unsigned long totalram_pages __read_mostly;
> > +atomic_long_t _totalram_pages __read_mostly;
> > unsigned long totalreserve_pages __read_mostly;
> > unsigned long totalcma_pages __read_mostly;
> >
> > @@ -4744,11 +4745,11 @@ long si_mem_available(void)
> >
> > void si_meminfo(struct sysinfo *val)
> > {
> > - val->totalram = totalram_pages;
> > + val->totalram = totalram_pages();
> > val->sharedram = global_node_page_state(NR_SHMEM);
> > val->freeram = global_zone_page_state(NR_FREE_PAGES);
> > val->bufferram = nr_blockdev_pages();
> > - val->totalhigh = totalhigh_pages;
> > + val->totalhigh = totalhigh_pages();
> > val->freehigh = nr_free_highpages();
> > val->mem_unit = PAGE_SIZE;
> > }
> > @@ -7063,10 +7064,10 @@ void adjust_managed_page_count(struct page *page, long count)
> > {
> > spin_lock(&managed_page_count_lock);
> > atomic_long_add(count, &page_zone(page)->managed_pages);
> > - totalram_pages += count;
> > + totalram_pages_add(count);
> > #ifdef CONFIG_HIGHMEM
> > if (PageHighMem(page))
> > - totalhigh_pages += count;
> > + totalhigh_pages_add(count);
> > #endif
> > spin_unlock(&managed_page_count_lock);
> > }
> > @@ -7109,9 +7110,9 @@ unsigned long free_reserved_area(void *start, void *end, int poison, char *s)
> > void free_highmem_page(struct page *page)
> > {
> > __free_reserved_page(page);
> > - totalram_pages++;
> > + totalram_pages_inc();
> > atomic_long_inc(&page_zone(page)->managed_pages);
> > - totalhigh_pages++;
> > + totalhigh_pages_inc();
> > }
> > #endif
> >
> > @@ -7160,10 +7161,10 @@ void __init mem_init_print_info(const char *str)
> > physpages << (PAGE_SHIFT - 10),
> > codesize >> 10, datasize >> 10, rosize >> 10,
> > (init_data_size + init_code_size) >> 10, bss_size >> 10,
> > - (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10),
> > + (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT - 10),
> > totalcma_pages << (PAGE_SHIFT - 10),
> > #ifdef CONFIG_HIGHMEM
> > - totalhigh_pages << (PAGE_SHIFT - 10),
> > + totalhigh_pages() << (PAGE_SHIFT - 10),
> > #endif
> > str ? ", " : "", str ? str : "");
> > }
> > diff --git a/mm/shmem.c b/mm/shmem.c
> > index 6556e86..d4ee5a6 100644
> > --- a/mm/shmem.c
> > +++ b/mm/shmem.c
> > @@ -109,13 +109,13 @@ struct shmem_falloc {
> > #ifdef CONFIG_TMPFS
> > static unsigned long shmem_default_max_blocks(void)
> > {
> > - return totalram_pages / 2;
> > + return totalram_pages() / 2;
> > }
> >
> > static unsigned long shmem_default_max_inodes(void)
> > {
> > - unsigned long totalram_pgs = totalram_pages;
> > - return min(totalram_pgs - totalhigh_pages, totalram_pgs / 2);
> > + unsigned long totalram_pgs = totalram_pages();
> > + return min(totalram_pgs - totalhigh_pages(), totalram_pgs / 2);
> > }
> > #endif
> >
> > @@ -3275,7 +3275,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
> > size = memparse(value,&rest);
> > if (*rest == '%') {
> > size <<= PAGE_SHIFT;
> > - size *= totalram_pages;
> > + size *= totalram_pages();
> > do_div(size, 100);
> > rest++;
> > }
> > diff --git a/mm/slab.c b/mm/slab.c
> > index 2a5654b..bc3de2f 100644
> > --- a/mm/slab.c
> > +++ b/mm/slab.c
> > @@ -1248,7 +1248,7 @@ void __init kmem_cache_init(void)
> > * page orders on machines with more than 32MB of memory if
> > * not overridden on the command line.
> > */
> > - if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT)
> > + if (!slab_max_order_set && totalram_pages() > (32 << 20) >> PAGE_SHIFT)
> > slab_max_order = SLAB_MAX_ORDER_HI;
> >
> > /* Bootstrap is tricky, because several objects are allocated
> > diff --git a/mm/swap.c b/mm/swap.c
> > index aa48371..a87bd4c 100644
> > --- a/mm/swap.c
> > +++ b/mm/swap.c
> > @@ -1023,7 +1023,7 @@ unsigned pagevec_lookup_range_nr_tag(struct pagevec *pvec,
> > */
> > void __init swap_setup(void)
> > {
> > - unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT);
> > + unsigned long megs = totalram_pages() >> (20 - PAGE_SHIFT);
> >
> > /* Use a smaller cluster for small-memory machines */
> > if (megs < 16)
> > diff --git a/mm/util.c b/mm/util.c
> > index 7f1f165..c3256d5 100644
> > --- a/mm/util.c
> > +++ b/mm/util.c
> > @@ -600,7 +600,7 @@ unsigned long vm_commit_limit(void)
> > if (sysctl_overcommit_kbytes)
> > allowed = sysctl_overcommit_kbytes >> (PAGE_SHIFT - 10);
> > else
> > - allowed = ((totalram_pages - hugetlb_total_pages())
> > + allowed = ((totalram_pages() - hugetlb_total_pages())
> > * sysctl_overcommit_ratio / 100);
> > allowed += total_swap_pages;
> >
> > diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> > index 97d4b25..871e41c 100644
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -1634,7 +1634,7 @@ void *vmap(struct page **pages, unsigned int count,
> >
> > might_sleep();
> >
> > - if (count > totalram_pages)
> > + if (count > totalram_pages())
> > return NULL;
> >
> > size = (unsigned long)count << PAGE_SHIFT;
> > @@ -1739,7 +1739,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
> > unsigned long real_size = size;
> >
> > size = PAGE_ALIGN(size);
> > - if (!size || (size >> PAGE_SHIFT) > totalram_pages)
> > + if (!size || (size >> PAGE_SHIFT) > totalram_pages())
> > goto fail;
> >
> > area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED |
> > diff --git a/mm/workingset.c b/mm/workingset.c
> > index b15799d..bd17239 100644
> > --- a/mm/workingset.c
> > +++ b/mm/workingset.c
> > @@ -550,7 +550,7 @@ static int __init workingset_init(void)
> > * double the initial memory by using totalram_pages as-is.
> > */
> > timestamp_bits = BITS_PER_LONG - EVICTION_SHIFT;
> > - max_order = fls_long(totalram_pages - 1);
> > + max_order = fls_long(totalram_pages() - 1);
> > if (max_order > timestamp_bits)
> > bucket_order = max_order - timestamp_bits;
> > pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
> > diff --git a/mm/zswap.c b/mm/zswap.c
> > index cd91fd9..a4e4d36 100644
> > --- a/mm/zswap.c
> > +++ b/mm/zswap.c
> > @@ -219,8 +219,8 @@ struct zswap_tree {
> >
> > static bool zswap_is_full(void)
> > {
> > - return totalram_pages * zswap_max_pool_percent / 100 <
> > - DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE);
> > + return totalram_pages() * zswap_max_pool_percent / 100 <
> > + DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE);
> > }
> >
> > static void zswap_update_total_size(void)
> > diff --git a/net/dccp/proto.c b/net/dccp/proto.c
> > index 0cef31e..44f1bf7 100644
> > --- a/net/dccp/proto.c
> > +++ b/net/dccp/proto.c
> > @@ -1131,7 +1131,7 @@ static inline void dccp_mib_exit(void)
> > static int __init dccp_init(void)
> > {
> > unsigned long goal;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> > int ehash_order, bhash_order, i;
> > int rc;
> >
> > diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
> > index 1c002c0..950613e 100644
> > --- a/net/decnet/dn_route.c
> > +++ b/net/decnet/dn_route.c
> > @@ -1866,7 +1866,7 @@ void __init dn_route_init(void)
> > dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
> > add_timer(&dn_route_timer);
> >
> > - goal = totalram_pages >> (26 - PAGE_SHIFT);
> > + goal = totalram_pages() >> (26 - PAGE_SHIFT);
> >
> > for(order = 0; (1UL << order) < goal; order++)
> > /* NOTHING */;
> > diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
> > index 03b51cd..b467a7c 100644
> > --- a/net/ipv4/tcp_metrics.c
> > +++ b/net/ipv4/tcp_metrics.c
> > @@ -1000,7 +1000,7 @@ static int __net_init tcp_net_metrics_init(struct net *net)
> >
> > slots = tcpmhash_entries;
> > if (!slots) {
> > - if (totalram_pages >= 128 * 1024)
> > + if (totalram_pages() >= 128 * 1024)
> > slots = 16 * 1024;
> > else
> > slots = 8 * 1024;
> > diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
> > index 0b1801e..edc83f2 100644
> > --- a/net/netfilter/nf_conntrack_core.c
> > +++ b/net/netfilter/nf_conntrack_core.c
> > @@ -2248,7 +2248,7 @@ static __always_inline unsigned int total_extension_size(void)
> >
> > int nf_conntrack_init_start(void)
> > {
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> > int max_factor = 8;
> > int ret = -ENOMEM;
> > int i;
> > diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
> > index 6cb9a74..2df06c4f 100644
> > --- a/net/netfilter/xt_hashlimit.c
> > +++ b/net/netfilter/xt_hashlimit.c
> > @@ -274,7 +274,7 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg,
> > struct xt_hashlimit_htable *hinfo;
> > const struct seq_operations *ops;
> > unsigned int size, i;
> > - unsigned long totalram_pgs = totalram_pages;
> > + unsigned long totalram_pgs = totalram_pages();
> > int ret;
> >
> > if (cfg->size) {
> > diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
> > index 16bd187..d6f3280 100644
> > --- a/security/integrity/ima/ima_kexec.c
> > +++ b/security/integrity/ima/ima_kexec.c
> > @@ -106,7 +106,7 @@ void ima_add_kexec_buffer(struct kimage *image)
> > kexec_segment_size = ALIGN(ima_get_binary_runtime_size() +
> > PAGE_SIZE / 2, PAGE_SIZE);
> > if ((kexec_segment_size == ULONG_MAX) ||
> > - ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages / 2)) {
> > + ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages() / 2)) {
> > pr_err("Binary measurement list too large.\n");
> > return;
> > }
> > --
> > 1.9.1
> >
>
> --
> Michal Hocko
> SUSE Labs
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
2018-11-07 10:28 ` Michal Hocko
@ 2018-11-07 10:39 ` Michal Hocko
0 siblings, 0 replies; 20+ messages in thread
From: Michal Hocko @ 2018-11-07 10:39 UTC (permalink / raw)
To: Vlastimil Babka
Cc: Konstantin Khlebnikov, Arun KS, keescook, minchan, getarunks,
gregkh, akpm, linux-kernel, linux-mm, julia.lawall
On Wed 07-11-18 11:28:37, Michal Hocko wrote:
> On Wed 07-11-18 09:50:10, Vlastimil Babka wrote:
> > On 11/7/18 8:02 AM, Konstantin Khlebnikov wrote:
> [...]
> > > Could you point what exactly are you fixing with this set?
> > >
> > > from v2:
> > >
> > > > totalram_pages, zone->managed_pages and totalhigh_pages updates
> > > > are protected by managed_page_count_lock, but readers never care
> > > > about it. Convert these variables to atomic to avoid readers
> > > > potentially seeing a store tear.
> > >
> > > This?
> > >
> > >
> > > Aligned unsigned long almost always stored at once.
> >
> > The point is "almost always", so better not rely on it :) But the main
> > motivation was that managed_page_count_lock handling was complicating
> > Arun's "memory_hotplug: Free pages as higher order" patch and it seemed
> > a better idea to just remove and convert this to atomics, with
> > preventing potential store-to-read tearing as a bonus.
>
> And more importantly the lock itself seems bogus as mentioned here
> http://lkml.kernel.org/r/20181106141732.GR27423@dhcp22.suse.cz
Should be http://lkml.kernel.org/r/20181107103630.GF2453@dhcp22.suse.cz
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 20+ messages in thread
* Re: [PATCH v1 4/4] mm: Remove managed_page_count spinlock
2018-10-26 11:01 ` [PATCH v1 4/4] mm: Remove managed_page_count spinlock Arun KS
[not found] ` <20181106141732.GR27423@dhcp22.suse.cz>
@ 2018-11-07 11:50 ` Vlastimil Babka
1 sibling, 0 replies; 20+ messages in thread
From: Vlastimil Babka @ 2018-11-07 11:50 UTC (permalink / raw)
To: Arun KS
Cc: keescook, khlebnikov, minchan, getarunks, gregkh, akpm, mhocko,
linux-kernel, linux-mm
On 10/26/18 1:01 PM, Arun KS wrote:
> Now totalram_pages and managed_pages are atomic varibles. No need
> of managed_page_count spinlock.
>
> Signed-off-by: Arun KS <arunks@codeaurora.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> include/linux/mmzone.h | 6 ------
> mm/page_alloc.c | 5 -----
> 2 files changed, 11 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 597b0c7..aa960f6 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -428,12 +428,6 @@ struct zone {
> * Write access to present_pages at runtime should be protected by
> * mem_hotplug_begin/end(). Any reader who can't tolerant drift of
> * present_pages should get_online_mems() to get a stable value.
> - *
> - * Read access to managed_pages should be safe because it's unsigned
> - * long. Write access to zone->managed_pages and totalram_pages are
> - * protected by managed_page_count_lock at runtime. Idealy only
> - * adjust_managed_page_count() should be used instead of directly
> - * touching zone->managed_pages and totalram_pages.
> */
> atomic_long_t managed_pages;
> unsigned long spanned_pages;
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index af832de..e29e78f 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -122,9 +122,6 @@
> };
> EXPORT_SYMBOL(node_states);
>
> -/* Protect totalram_pages and zone->managed_pages */
> -static DEFINE_SPINLOCK(managed_page_count_lock);
> -
> atomic_long_t _totalram_pages __read_mostly;
> unsigned long totalreserve_pages __read_mostly;
> unsigned long totalcma_pages __read_mostly;
> @@ -7062,14 +7059,12 @@ static int __init cmdline_parse_movablecore(char *p)
>
> void adjust_managed_page_count(struct page *page, long count)
> {
> - spin_lock(&managed_page_count_lock);
> atomic_long_add(count, &page_zone(page)->managed_pages);
> totalram_pages_add(count);
> #ifdef CONFIG_HIGHMEM
> if (PageHighMem(page))
> totalhigh_pages_add(count);
> #endif
> - spin_unlock(&managed_page_count_lock);
> }
> EXPORT_SYMBOL(adjust_managed_page_count);
>
>
^ permalink raw reply [flat|nested] 20+ messages in thread
* [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic
@ 2018-10-26 11:00 Arun KS
0 siblings, 0 replies; 20+ messages in thread
From: Arun KS @ 2018-10-26 11:00 UTC (permalink / raw)
Cc: keescook, minchan, getarunks, gregkh, akpm, mhocko, vbabka,
linux-kernel, linux-mm, Arun KS
This series convert totalram_pages, totalhigh_pages and
zone->managed_pages to atomic variables.
The patch was comiple tested on x86(x86_64_defconfig & i386_defconfig)
on tip of linux-mmotm. And memory hotplug tested on arm64, but on an
older version of kernel.
Arun KS (4):
mm: Fix multiple evaluvations of totalram_pages and managed_pages
mm: Convert zone->managed_pages to atomic variable
mm: convert totalram_pages and totalhigh_pages variables to atomic
mm: Remove managed_page_count spinlock
arch/csky/mm/init.c | 4 +-
arch/powerpc/platforms/pseries/cmm.c | 10 ++--
arch/s390/mm/init.c | 2 +-
arch/um/kernel/mem.c | 3 +-
arch/x86/kernel/cpu/microcode/core.c | 5 +-
drivers/char/agp/backend.c | 4 +-
drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +-
drivers/hv/hv_balloon.c | 19 +++----
drivers/md/dm-bufio.c | 2 +-
drivers/md/dm-crypt.c | 2 +-
drivers/md/dm-integrity.c | 2 +-
drivers/md/dm-stats.c | 2 +-
drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +-
drivers/misc/vmw_balloon.c | 2 +-
drivers/parisc/ccio-dma.c | 4 +-
drivers/parisc/sba_iommu.c | 4 +-
drivers/staging/android/ion/ion_system_heap.c | 2 +-
drivers/xen/xen-selfballoon.c | 6 +--
fs/ceph/super.h | 2 +-
fs/file_table.c | 7 +--
fs/fuse/inode.c | 2 +-
fs/nfs/write.c | 2 +-
fs/nfsd/nfscache.c | 2 +-
fs/ntfs/malloc.h | 2 +-
fs/proc/base.c | 2 +-
include/linux/highmem.h | 28 ++++++++++-
include/linux/mm.h | 27 +++++++++-
include/linux/mmzone.h | 15 +++---
include/linux/swap.h | 1 -
kernel/fork.c | 5 +-
kernel/kexec_core.c | 5 +-
kernel/power/snapshot.c | 2 +-
lib/show_mem.c | 2 +-
mm/highmem.c | 4 +-
mm/huge_memory.c | 2 +-
mm/kasan/quarantine.c | 2 +-
mm/memblock.c | 6 +--
mm/memory_hotplug.c | 4 +-
mm/mm_init.c | 2 +-
mm/oom_kill.c | 2 +-
mm/page_alloc.c | 71 +++++++++++++--------------
mm/shmem.c | 7 +--
mm/slab.c | 2 +-
mm/swap.c | 2 +-
mm/util.c | 2 +-
mm/vmalloc.c | 4 +-
mm/vmstat.c | 4 +-
mm/workingset.c | 2 +-
mm/zswap.c | 4 +-
net/dccp/proto.c | 7 +--
net/decnet/dn_route.c | 2 +-
net/ipv4/tcp_metrics.c | 2 +-
net/netfilter/nf_conntrack_core.c | 7 +--
net/netfilter/xt_hashlimit.c | 5 +-
net/sctp/protocol.c | 7 +--
security/integrity/ima/ima_kexec.c | 2 +-
58 files changed, 195 insertions(+), 144 deletions(-)
--
1.9.1
^ permalink raw reply [flat|nested] 20+ messages in thread
end of thread, other threads:[~2018-11-07 11:50 UTC | newest]
Thread overview: 20+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-10-26 11:00 ` [PATCH v1 1/4] mm: Fix multiple evaluvations of totalram_pages and managed_pages Arun KS
2018-10-26 11:01 ` [PATCH v1 2/4] mm: Convert zone->managed_pages to atomic variable Arun KS
2018-10-26 11:01 ` [PATCH v1 3/4] mm: convert totalram_pages and totalhigh_pages variables to atomic Arun KS
[not found] ` <20181106141438.GQ27423@dhcp22.suse.cz>
2018-11-07 10:38 ` Michal Hocko
2018-10-26 11:01 ` [PATCH v1 4/4] mm: Remove managed_page_count spinlock Arun KS
[not found] ` <20181106141732.GR27423@dhcp22.suse.cz>
2018-11-07 10:36 ` Michal Hocko
2018-11-07 11:50 ` Vlastimil Babka
2018-11-06 5:38 ` [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-11-06 8:17 ` Konstantin Khlebnikov
2018-11-06 8:30 ` Arun KS
2018-11-06 8:37 ` Konstantin Khlebnikov
2018-11-06 8:43 ` Arun KS
2018-11-07 7:02 ` Konstantin Khlebnikov
2018-11-07 8:50 ` Vlastimil Babka
2018-11-07 10:28 ` Michal Hocko
2018-11-07 10:39 ` Michal Hocko
2018-11-07 0:22 ` Andrew Morton
2018-11-07 6:19 ` Arun KS
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2018-10-26 11:00 Arun KS
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