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Date: Mon, 18 Jan 2010 20:26:41 +0900 From: Tejun Heo <tj@...nel.org> To: Peter Zijlstra <peterz@...radead.org> CC: torvalds@...ux-foundation.org, mingo@...e.hu, awalls@...ix.net, linux-kernel@...r.kernel.org, jeff@...zik.org, akpm@...ux-foundation.org, jens.axboe@...cle.com, rusty@...tcorp.com.au, cl@...ux-foundation.org, dhowells@...hat.com, arjan@...ux.intel.com, avi@...hat.com, johannes@...solutions.net, andi@...stfloor.org Subject: Re: [PATCH 01/40] sched: consult online mask instead of active in select_fallback_rq() Hello, On 01/18/2010 07:13 PM, Peter Zijlstra wrote: > On Mon, 2010-01-18 at 09:57 +0900, Tejun Heo wrote: >> If called after sched_class chooses a CPU which isn't in a task's >> cpus_allowed mask, > > I can only see this happening when you're changing cpus_allowed after > starting to take down the cpu. IOW you're moving a thread to a dying > cpu. > > This is because you're spawning workqueue threads while we're going > down? It got triggered by the hotplug callback creating the trustee kthread and kthread_bind()ing it to the target cpu during CPU_DOWN_PREPARE. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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