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

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Date:	Mon, 29 Nov 2010 17:44:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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


* Linus Torvalds <torvalds@...ux-foundation.org> 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?

Something along that line, or worse.

> Peter - getting the wrong answer quickly is not any better than strong 
> serialization.

Yeah, obviously.

> Anyway, I'm happy to hear that the problem hasn't reached mainline yet.

It wont.

Thanks,

	Ingo
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