linux-kernel - Re: [RFI] Shared accounting for memory resource controller

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Message-Id: <20090408163440.4442dc3c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 8 Apr 2009 16:34:40 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Bharata B Rao <bharata.rao@...il.com>
Cc:	balbir@...ux.vnet.ibm.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	Rik van Riel <riel@...riel.com>,
	Bharata B Rao <bharata.rao@...ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFI] Shared accounting for memory resource controller

On Wed, 8 Apr 2009 13:01:15 +0530
Bharata B Rao <bharata.rao@...il.com> wrote:

> On Wed, Apr 8, 2009 at 12:48 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > On Wed, 8 Apr 2009 12:41:15 +0530
> > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > > 3. Using the above, we can then try to (using an algorithm you
> > > proposed), try to do some work for figuring out the shared percentage.
> > >
> > This is the point. At last. Why "# of shared pages" is important ?
> >
> > I wonder it's better to add new stat file as memory.cacheinfo which helps
> > following kind of commands.
> >
> >  #cacheinfo /cgroups/memory/group01/
> >       /usr/lib/libc.so.1     30pages
> >       /var/log/messages      1 pages
> >       /tmp/xxxxxx            20 pages
> 
> Can I suggest that we don't add new files for additional stats and try
> as far as possible to include them in <controller>.stat file. Please
> note that we have APIs in libcgroup library which can return
> statistics from controllers associated with a cgroup and these APIs
> assume that stats are part of <controller>.stat file.
> 
Hmm ? Is there generic assumption as all cgroup has "stat" file ?
And libcgroup cause bug if the new entry is added to stat file ?
(IOW, libcgroup can't ignore new entry added ?)

Thanks,
-Kame

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