linux-kernel - Re: [RFC][PATCH 5/5] sched: Reduce ttwu rq->lock contention

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Message-ID: <20101217182154.GA12817@redhat.com>
Date:	Fri, 17 Dec 2010 19:21:54 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>, Paul Turner <pjt@...gle.com>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 5/5] sched: Reduce ttwu rq->lock contention

On 12/17, Peter Zijlstra wrote:
>
> Hrmph, so is it only about serializing concurrent wakeups?

I __think__ that it is possible to solve other problems, but
of course I am not sure ;)

> If so, we
> could possibly hold p->pi_lock over the wakeup.

Hmm, yes, this looks right.

Oleg.

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