linux-kernel - Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede

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Date:	Tue, 13 Sep 2011 20:07:41 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Paul Turner <pjt@...gle.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs
 unpinnede

On Tue, 2011-09-13 at 23:24 +0530, Srivatsa Vaddagiri wrote:
> I guess the additional "system" time
> can't be accounted for easily by the tick-based accounting system we
> have. I agree there could be other un-observed side-effects of increased
> load-balance frequency (like workload performance) that I haven't noticed. 

Yeah, very hard, its the tick that starts the balancer, so it would have
to last longer than a tick to be noticed, very unlikely.

We should implement full blown CONFIG_VIRT_CPU_ACCOUNTING,.. except I
bet that once we do that people will want it enabled and I'm pretty sure
people also don't want to pay the price for it... :-)
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