linux-kernel - Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched

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Date:	Tue, 29 Jun 2010 12:43:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	shenghui <crosslonelyover@...il.com>
Cc:	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] avoid race condition in pick_next_task_fair in 
 kernel/sched_fair.c

On Tue, 2010-06-29 at 15:10 +0800, shenghui wrote:
> I think some lock on the metadata can fix this issue, but we may
> change plenty of code to add support for lock. I think the easist
> way is just substacting nr_running before dequing tasks. 

But all that is fully serialized by the rq->lock.. so I'm really not
seeing how this can happen.


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