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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2011-02-01 15:52:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-02 16:03:19 -0800
commit3751d60430fe4c26460a5ca8ad8672d32f93bcb1 (patch)
treef0bbefb76a4fc328ca441bd71fc49a5a091bb323 /mm
parent8493ae439f7038b502df1d687e61dde54c27ca92 (diff)
downloadlinux-linaro-stable-3751d60430fe4c26460a5ca8ad8672d32f93bcb1.tar.gz
memcg: fix event counting breakage from recent THP update
Changes in e401f1761 ("memcg: modify accounting function for supporting THP better") adds nr_pages to support multiple page size in memory_cgroup_charge_statistics. But counting the number of event nees abs(nr_pages) for increasing counters. This patch fixes event counting. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Minchan Kim <minchan.kim@gmail.com> 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/memcontrol.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fc75f34ba609..da53a252b259 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -612,8 +612,10 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *mem,
/* pagein of a big page is an event. So, ignore page size */
if (nr_pages > 0)
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]);
- else
+ else {
__this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]);
+ nr_pages = -nr_pages; /* for event */
+ }
__this_cpu_add(mem->stat->count[MEM_CGROUP_EVENTS], nr_pages);