linux-kernel - Re: [RFC PATCH 1/2] New cgroup subsystem API (->initialize())

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Message-Id: <20090226172056.d0e53e98.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 26 Feb 2009 17:20:56 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	bharata@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC PATCH 1/2] New cgroup subsystem API (->initialize())

On Thu, 26 Feb 2009 16:11:36 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> Bharata B Rao wrote:
> > On Thu, Feb 26, 2009 at 10:55:54AM +0800, Li Zefan wrote:
> >> Bharata B Rao wrote:
> >>> From: Balaji Rao <balajirrao@...il.com>
> > Another thing that could be done is to enhance already existing
> > cpuacct controller to do stime/utime accouting also. cpuacct controller
> > exists precisely for doing per-cgroup accounting and is there any reason
> > why these stats shouldn't be part of cpuacct controller. If we do this,
> > users would be forced to use cpu controller and cpuacct controller
> > together. Is that a problem ?
> > 
> 
> I wondered why these stats is part of cpu subsystem but not cpuacct.
> And I don't see any problem to use these 2 subsystems together. Actually
> this is one of the advantage of cgroup.
> 
IMHO, cpuacct subsystem should count utime/stime.
current statistics is not so useful.

BTW, I wonde why cpuacct subsys walks up to root at charging...
I think we can gather all subtree information at read...

Thanks
-Kame

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