Subject: Re: [PATCH 01/40] sched: consult online mask instead of active in
 select_fallback_rq()
From: Peter Zijlstra <peterz@infradead.org>
To: Tejun Heo <tj@kernel.org>
Cc: torvalds@linux-foundation.org, mingo@elte.hu, awalls@radix.net,
       linux-kernel@vger.kernel.org, jeff@garzik.org,
       akpm@linux-foundation.org, jens.axboe@oracle.com, rusty@rustcorp.com.au,
       cl@linux-foundation.org, dhowells@redhat.com, arjan@linux.intel.com,
       avi@redhat.com, johannes@sipsolutions.net, andi@firstfloor.org
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Date: Mon, 18 Jan 2010 11:13:40 +0100
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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?


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