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

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Message-ID: <20090312042951.GA3344@in.ibm.com>
Date:	Thu, 12 Mar 2009 09:59:51 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...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: [RFC PATCH] cpuacct: per-cgroup utime/stime statistics - v1

On Wed, Mar 11, 2009 at 09:04:34PM +0530, Balbir Singh wrote:
> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-03-11 09:38:12]:
> 
> > BTW, I'm not sure but don't we need special handling if
> > CONFIG_VIRT_CPU_ACCOUNTING=y ?
> 
> Good point. Bharata, with CONFIG_VIRT_CPU_ACCOUNTING, utime and stime
> is accounted for within the architecture.

True, but as I replied to Kamezawa in the other thread, these
architectures are still dependent on generic implementations of
account_{system,user}_time() which feed to per-process and system-wide
accounting. And this is where we have hooks for per-cgroup accounting.
So I don't see why we need to handle these archs specially. Do I miss
something ?

Regards,
Bharata.
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