linux-kernel - Re: [patch] sched: fix set_task_cpu() and provide an unlocked runqueue variant

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Message-ID: <1259244563.31676.53.camel@laptop>
Date:	Thu, 26 Nov 2009 15:09:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] sched: fix set_task_cpu() and provide an unlocked
 runqueue variant

On Thu, 2009-11-26 at 11:16 +0100, Mike Galbraith wrote:
> > min_vruntime should only ever be poked at when holding the respective
> > rq->lock, even with a barrier a 64bit read on a 32bit machine can go all
> > funny.
> 
> Yeah, but we're looking at an unlocked runqueue.  But never mind...

The patch is also poking at rq->clock without rq->lock held... not very
nice.

Gah, I hate that we're doing migration things without holding both rq's,
this is making live so very interesting ;-)

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