linux-kernel - Re: [patch] sched: fix b5d9d734 blunder in task_new

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Message-ID: <1259085280.4531.1730.camel@laptop>
Date:	Tue, 24 Nov 2009 18:54:40 +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 b5d9d734 blunder in task_new_fair()

On Tue, 2009-11-24 at 18:35 +0100, Peter Zijlstra wrote:
> On Tue, 2009-11-24 at 18:07 +0100, Mike Galbraith wrote:
> > >       if (p->sched_class->task_new) {
> > >               /* can detect migration through: task_cpu(p) != smp_processor_id() */
> > 
> > What if the parent was migrated before we got here?
> 
> Well, the only case it really matters for is the child_runs_first crap,
> which is basically broken on SMP anyway, so I don't think we care too
> much if we race here.
> 
> Unless I missed some detail that is ;-)


Also, we're running all this from the parent context, and we have
preemption disabled, we're not going anywhere.

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