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memcg: fix memory.memsw.usage_in_bytes for root cgroup

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A memory cgroup has a memory.memsw.usage_in_bytes file.  It shows the sum
of the usage of pages and swapents in the cgroup.  Presently the root
cgroup's memsw.usage_in_bytes shows the wrong value - the number of
swapents are not added.

So take MEM_CGROUP_STAT_SWAPOUT into account.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2009-12-15 16:47:01 -08:00 committed by Linus Torvalds
parent 6be4b78993
commit cd9b45b78a
1 changed files with 1 additions and 0 deletions
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mm/memcontrol.c
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@ -2542,6 +2542,7 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
val += idx_val;
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_SWAPOUT, &idx_val);
val += idx_val;
val <<= PAGE_SHIFT;
} else
val = res_counter_read_u64(&mem->memsw, name);