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Message-Id: <1237296361.7867.16.camel@twins>
Date: Tue, 17 Mar 2009 14:26:01 +0100
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: balbir@...ux.vnet.ibm.com
Cc: 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>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH -tip] cpuacct: Make cpuacct hierarchy walk in
cpuacct_charge() safe when rcupreempt is used.
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.
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