Re: [PATCH] [TRIVIAL] memcg: fix memory.memsw.usage_in_bytes forroot cgroup

[KAMEZAWA Hiroyuki]

On Wed, 9 Dec 2009 16:21:09 -0800
Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Thu, 10 Dec 2009 08:59:29 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> 
> > On Wed,  9 Dec 2009 17:48:58 +0200
> > "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx> wrote:
> > 
> > > We really want to take MEM_CGROUP_STAT_SWAPOUT into account.
> > > 
> > > Signed-off-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
> > > Cc: stable@xxxxxxxxxx
> > 
> > Thanks.
> > 
> > Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> > 
> 
> Is this bug sufficiently serious to justify a -stable backport?
> 
I think so.

> If so, why?
> 

memory cgroup has a file memory.memsw.usage_in_bytes file. It shows sum of
the usage of pages and swapents in the cgroup.  Now, root cgroup's 
memsw.usage_in_bytes shows wrong value....the number of swapents are not
added. This patch fixesi it.

Thanks,
-Kame

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