linux-kernel - Re: [PATCH -tip] cpuacct: Make cpuacct hierarchy walk in cpuacct

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Message-Id: <20090318085908.215f665d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 18 Mar 2009 08:59:08 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	balbir@...ux.vnet.ibm.com,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>, linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH -tip] cpuacct: Make cpuacct hierarchy walk in
 cpuacct_charge() safe when rcupreempt is used.

On Tue, 17 Mar 2009 14:26:01 +0100
Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> On Tue, 2009-03-17 at 18:42 +0530, Balbir Singh wrote:
> 
> > I'd like to get the patches in -tip and see the results, I would
> > recommend using percpu_counter_sum() while reading the data as an
> > enhancement to this patch. If user space does not overwhelm with a lot
> > of reads, sum would work out better.
> 
> You trust userspace? I'd rather not.
> 
hehe, I don't trust, either.
BTW, is there anyone wants "remove rq->lock" patch ?
If yes, I'll dig the patch from my graveyard.

Thanks,
-Kame

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