mm: oom analysis: add shmem vmstat
authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Tue, 22 Sep 2009 00:01:33 +0000 (17:01 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 22 Sep 2009 14:17:27 +0000 (07:17 -0700)
commit4b02108ac1b3354a22b0d83c684797692efdc395
tree9f65d6e8e35ddce940e7b9da6305cf5a19e5904e
parentc6a7f5728a1db45d30df55a01adc130b4ab0327c
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>
drivers/base/node.c
fs/proc/meminfo.c
include/linux/mmzone.h
mm/filemap.c
mm/migrate.c
mm/page_alloc.c
mm/vmstat.c