linux-kernel - Re: [PATCH] remove rq->lock from cpuacct cgroup v2

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Message-Id: <20090304174635.43d0f554.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 4 Mar 2009 17:46:35 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Bharata B Rao <bharata.rao@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	paulmck@...ux.vnet.ibm.com, Li Zefan <lizf@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, kenchen@...gle.com
Subject: Re: [PATCH] remove rq->lock from cpuacct cgroup v2

On Wed, 4 Mar 2009 17:20:05 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Wed, 4 Mar 2009 13:24:43 +0530
> Bharata B Rao <bharata.rao@...il.com> wrote:
> At first, generic per-cpu counter sounds interesting but to be honest,
> some special handling is used for cpuacct based on its characteristic.
> 
>   - Writer works under non-preemptable context.
>   - There is only one writer.
> 
If utime/stime updates works on above context, using the same code will be good.

I don't use any cpuacct structure specific in routines...
If you want me to rewrite it, I'll do. please request what you want.

Thanks,
-Kame 

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