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Date: Mon, 21 Dec 2009 10:22:57 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Tejun Heo <tj@...nel.org> Cc: torvalds@...ux-foundation.org, awalls@...ix.net, linux-kernel@...r.kernel.org, jeff@...zik.org, mingo@...e.hu, 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: workqueue thing On Mon, 2009-12-21 at 12:04 +0900, Tejun Heo wrote: > When IO goes wrong, in extreme > cases, it can easily take over thirty secs to recover and that's > required by the hardware specifications, so anything which ends up > waiting on IO can take a pretty long time. The only piece of code > which is necessary to support that is the code necessary to migrate > back tasks to CPUs when they come online again. It's not a lot of > ugly code. Why does it need to get migrated back, there are no affinity promises if you allow hotplug to continue, so it might as well complete and continue on the other cpu. And yes, it is a lot of very ugly code. -- 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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