linux-kernel - Re: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics

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Message-Id: <20090323164842.78212757.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 23 Mar 2009 16:48:42 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	bharata@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.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: [PATCH -tip] cpuacct: per-cgroup utime/stime statistics - v4

On Mon, 23 Mar 2009 13:17:50 +0530
Bharata B Rao <bharata@...ux.vnet.ibm.com> wrote:

> On Mon, Mar 23, 2009 at 04:01:12PM +0900, KAMEZAWA Hiroyuki wrote:
> > 
> > Removet this.
> > 
> > +- It is possible to see slightly outdated values for stime and utime
> > +  due to the batch processing nature of percpu_counter.
> 
> This will explain why the stime and utime values for the top cgroup is
> different from the ones seen from /proc/stat. Hence I would prefer to have a
> mention of it in the documentation.
> 
i see.

Thanks,
-Kame
> [root@...11 cgroups]# cat cpuacct.stat ; cat /proc/stat | grep cpu
> utime 3110
> stime 8410
> cpu  3151 2 8336 4051594 2189 0 133 0 0
> ...
> 
> Regards,
> Bharata.
> 

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