linux-kernel - Re: [RFC tg_shares_up improvements - v1 00/12] [RFC tg_shares_up - v1 00/12] Reducing cost of tg->shares distribution

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Message-ID: <20101017120933.GM13048@balbir.in.ibm.com>
Date:	Sun, 17 Oct 2010 17:39:33 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	pjt@...gle.com, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Pierre Bourdon <pbourdon@...ellency.fr>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>
Subject: Re: [RFC tg_shares_up improvements - v1 00/12] [RFC tg_shares_up -
 v1 00/12] Reducing cost of tg->shares distribution

* Peter Zijlstra <peterz@...radead.org> [2010-10-17 11:38:51]:

> On Sun, 2010-10-17 at 10:54 +0530, Balbir Singh wrote:
> > 
> > The results do sound interesting, could I recommend that you try to
> > get 1000 cgroups or so, with half of them as active and half inactive.
> > I'd also suggest tracking system and user time at the cgroup level. 
> 
> Sure, but do keep in mind that 500 active cgroups will always utterly
> suck no matter what you do, it means we do indeed need to iterate 500
> cgroups for a lot of scheduler operations.
>

I agree in general, but in my case I've seen nasty things even when
the groups were empty. 

-- 
	Three Cheers,
	Balbir
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