linux-kernel - Re: [patch 1/2] cpuacct: refactoring cpuusage_read / cpuusage

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Date:	Tue, 16 Dec 2008 12:15:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/2] cpuacct: refactoring cpuusage_read / cpuusage_write


* Ken Chen <kenchen@...gle.com> wrote:

> In the thread regarding to 'export percpu cpuacct cgroup stats'
> http://lkml.org/lkml/2008/12/7/13
> 
> akpm pointed out that current cpuacct code is inefficient.  This patch
> refactoring the following:
> 
> * make cpu_rq locking only on 32-bit
> * change iterator to each_present_cpu instead of each_possible_cpu to
>   make it hotplug friendly.
> 
> It's a bit of code churn, but I was rewarded with 160 byte code size saving
> on x86-64 arch and zero code size change on i386.

applied to tip/sched/core, thanks Ken!

	Ingo
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