linux-kernel - Re: [RFC] Shared page accounting for memory cgroup

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Date:	Thu, 7 Jan 2010 18:08:00 +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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC] Shared page accounting for memory cgroup

On Thu, 7 Jan 2010 17:48:14 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > > "How pages are shared" doesn't show good hints. I don't hear such parameter
> > > is used in production's resource monitoring software.
> > > 
> > 
> > You mean "How many pages are shared" are not good hints, please see my
> > justification above. With Virtualization (look at KSM for example),
> > shared pages are going to be increasingly important part of the
> > accounting.
> > 
> 
> Considering KSM, your cuounting style is tooo bad.
> 
> You should add 
> 
>  - MEM_CGROUP_STAT_SHARED_BY_KSM
>  - MEM_CGROUP_STAT_FOR_TMPFS/SYSV_IPC_SHMEM
> 
> counters to memcg rather than scanning. I can help tests.
> 
> I have no objections to have above 2 counters. It's informative.
> 
> But, memory reclaim can page-out pages even if pages are shared.
> So, "how heavy memcg is" is an independent problem from above coutners.
> 

In other words, above counters can show
"What role the memcg play in the system" to some extent.

But I don't express it as "heavy" ....."importance or influence of cgroup" ?

Thanks,
-Kame

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