linux-kernel - Re: [tip:sched/core] sched: cpuacct: Use bigger percpu counter batch values for stats counters

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Date:	Thu, 20 Aug 2009 17:16:03 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, schwidefsky@...ibm.com,
	balajirrao@...il.com, dhaval@...ux.vnet.ibm.com,
	tglx@...utronix.de, akpm@...ux-foundation.org
Subject: Re: [tip:sched/core] sched: cpuacct: Use bigger percpu counter batch 
	values for stats counters

Hi, Anton,

Do you have any data on what level of batching is good for
VIRT_CPU_ACCOUNTING? If it is going to be as high as INT_MAX, then
your patch seems to be the best way to go forward. We'll need to herd
away bad users who read cpuacct.stat frequently enough to create a
problem.

Balbir Singh.
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