linux-kernel - Re: [PATCH v4] sched: automated per session task groups

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Message-ID: <1291052268.32004.171.camel@laptop>
Date:	Mon, 29 Nov 2010 18:37:48 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v4] sched: automated per session task groups

On Mon, 2010-11-29 at 08:27 -0800, Linus Torvalds wrote:
> On Mon, Nov 29, 2010 at 3:53 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> >
> > Well we totally re-wrote the cgroup load-balancer in -tip. The thing
> > currently in -linus is a utter crap because its very strongly serialized
> > across all cores (some people spend like 25% of their time in there).
> 
> Well, it seems that the rewrite is more crap than the "utter crap" in
> current -git. What does that make -tip? Super-utter-crap?
> 
> Peter - getting the wrong answer quickly is not any better than strong
> serialization.

I know, from the testing so far we _thought_ it was fairly sane.
Apparently there's still some work to do.


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