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

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Message-ID: <AANLkTimQ2Kp2=um9ip7J2=-joskmz4P-0b_SrexFbTh0@mail.gmail.com>
Date:	Mon, 29 Nov 2010 08:27:40 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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, 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.

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

                    Linus
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