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SubjectRe: [PATCH] Add file based RSS accounting for memory resource controller (v2)
On Fri, 17 Apr 2009 09:14:59 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> page_cgroup->mem_cgroup != try_get_mem_cgroup_from_mm(mm); in many many cases.
>
> For example, libc and /bin/*** is tend to be loaded into default cgroup at boot but
> used by many cgroups. But mapcount of page caches for /bin/*** is 0 if not running.
>
> Then, File_Mapped can be greater than Cached easily if you use mm->owner.
>
> I can't estimate RSS in *my* cgroup if File_Mapped includes pages which is under
> other cgroups. It's meaningless.
> Especially, when Cached==0 but File_Mapped > 0, I think "oh, the kernel leaks somehing..hmm..."
>
> By useing page_cgroup->mem_cgroup, we can avoid above mess.
>
And, if pc->mem_cgroup is used, we can ignore "task move".

Thanks,
-Kame



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