linux-kernel - Re: [PATCH] Add file based RSS accounting for memory resource controller (v2)

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Message-Id: <20090417091737.27d71ab7.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 17 Apr 2009 09:17:37 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	balbir@...ux.vnet.ibm.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Add file based RSS accounting for memory resource
 controller (v2)

On Fri, 17 Apr 2009 09:14:59 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...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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