diff options
| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2009-09-21 17:01:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:27 -0700 |
| commit | 4b02108ac1b3354a22b0d83c684797692efdc395 (patch) | |
| tree | 9f65d6e8e35ddce940e7b9da6305cf5a19e5904e /mm | |
| parent | c6a7f5728a1db45d30df55a01adc130b4ab0327c (diff) | |
mm: oom analysis: add shmem vmstat
Recently we encountered OOM problems due to memory use of the GEM cache.
Generally a large amuont of Shmem/Tmpfs pages tend to create a memory
shortage problem.
We often use the following calculation to determine the amount of shmem
pages:
shmem = NR_ACTIVE_ANON + NR_INACTIVE_ANON - NR_ANON_PAGES
however the expression does not consider isolated and mlocked pages.
This patch adds explicit accounting for pages used by shmem and tmpfs.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/filemap.c | 4 | ||||
| -rw-r--r-- | mm/migrate.c | 5 | ||||
| -rw-r--r-- | mm/page_alloc.c | 5 | ||||
| -rw-r--r-- | mm/vmstat.c | 2 |
4 files changed, 13 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index dd51c68e2b86..bcc7372aebbc 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -119,6 +119,8 @@ void __remove_from_page_cache(struct page *page) page->mapping = NULL; mapping->nrpages--; __dec_zone_page_state(page, NR_FILE_PAGES); + if (PageSwapBacked(page)) + __dec_zone_page_state(page, NR_SHMEM); BUG_ON(page_mapped(page)); /* @@ -431,6 +433,8 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping, if (likely(!error)) { mapping->nrpages++; __inc_zone_page_state(page, NR_FILE_PAGES); + if (PageSwapBacked(page)) + __inc_zone_page_state(page, NR_SHMEM); spin_unlock_irq(&mapping->tree_lock); } else { page->mapping = NULL; diff --git a/mm/migrate.c b/mm/migrate.c index 0edeac91348d..37143b924484 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -312,7 +312,10 @@ static int migrate_page_move_mapping(struct address_space *mapping, */ __dec_zone_page_state(page, NR_FILE_PAGES); __inc_zone_page_state(newpage, NR_FILE_PAGES); - + if (PageSwapBacked(page)) { + __dec_zone_page_state(page, NR_SHMEM); + __inc_zone_page_state(newpage, NR_SHMEM); + } spin_unlock_irq(&mapping->tree_lock); return 0; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4e050f325ebd..e50c22545b8f 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2139,7 +2139,7 @@ void show_free_areas(void) " unevictable:%lu" " dirty:%lu writeback:%lu unstable:%lu buffer:%lu\n" " free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n" - " mapped:%lu pagetables:%lu bounce:%lu\n", + " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n", global_page_state(NR_ACTIVE_ANON), global_page_state(NR_ACTIVE_FILE), global_page_state(NR_INACTIVE_ANON), @@ -2153,6 +2153,7 @@ void show_free_areas(void) global_page_state(NR_SLAB_RECLAIMABLE), global_page_state(NR_SLAB_UNRECLAIMABLE), global_page_state(NR_FILE_MAPPED), + global_page_state(NR_SHMEM), global_page_state(NR_PAGETABLE), global_page_state(NR_BOUNCE)); @@ -2175,6 +2176,7 @@ void show_free_areas(void) " dirty:%lukB" " writeback:%lukB" " mapped:%lukB" + " shmem:%lukB" " slab_reclaimable:%lukB" " slab_unreclaimable:%lukB" " kernel_stack:%lukB" @@ -2200,6 +2202,7 @@ void show_free_areas(void) K(zone_page_state(zone, NR_FILE_DIRTY)), K(zone_page_state(zone, NR_WRITEBACK)), K(zone_page_state(zone, NR_FILE_MAPPED)), + K(zone_page_state(zone, NR_SHMEM)), K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)), K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)), zone_page_state(zone, NR_KERNEL_STACK) * diff --git a/mm/vmstat.c b/mm/vmstat.c index ceda39b63d7e..7214a4511257 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -644,7 +644,7 @@ static const char * const vmstat_text[] = { "nr_bounce", "nr_vmscan_write", "nr_writeback_temp", - + "nr_shmem", #ifdef CONFIG_NUMA "numa_hit", "numa_miss", |