linux-kernel - Re: [PATCH 2/2] scheduler: cgroups cpuaccouting: Make cpuusage atomic

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Message-ID: <1274295743.1674.1545.camel@laptop>
Date:	Wed, 19 May 2010 21:02:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Thomas Renninger <trenn@...e.de>
Cc:	mike@...roid.com, linux-kernel@...r.kernel.org,
	lizf@...fujitsu.com, menage@...gle.com,
	containers@...ts.linux-foundation.org, mingo@...e.hu
Subject: Re: [PATCH 2/2] scheduler: cgroups cpuaccouting: Make cpuusage
 atomic

On Wed, 2010-05-19 at 20:58 +0200, Thomas Renninger wrote:
> and avoid locking on 32 bit.
> This resolves an ugly dependency in cgroups_cpuaccount.c
> to per_cpu runqueues lock variable.

While I totally agree with the sentiments here, atomic64_t isn't
available on all 32bit archs and is _terribly_ expensive on ARCH=i386.


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