linux-kernel - Re: [PATCHSET] workqueue: concurrency managed workqueue, take#4

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Date:	Fri, 12 Mar 2010 14:03:11 +0900
From:	Tejun Heo <tj@...nel.org>
To:	David Howells <dhowells@...hat.com>
CC:	torvalds@...ux-foundation.org, mingo@...e.hu, peterz@...radead.org,
	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,
	arjan@...ux.intel.com, avi@...hat.com, johannes@...solutions.net,
	andi@...stfloor.org, oleg@...hat.com
Subject: Re: [PATCHSET] workqueue: concurrency managed workqueue, take#4

Hello,

On 03/10/2010 11:52 PM, David Howells wrote:
>  * queue_work - queue work on a workqueue
>  * @wq: workqueue to use
>  * @work: work to queue
>  *
>  * Returns 0 if @work was already on a queue, non-zero otherwise.
>  *
>  * We queue the work to the CPU on which it was submitted, but if the CPU dies
>  * it can be processed by another CPU.
> 
> So when a work item is running on a CPU, any work items it queues (including
> requeueing itself) will be queued upon that CPU for attention only by that CPU
> (assuming that CPU doesn't get pulled out)?

Yes, that's the one of the characteristics of workqueue.  For IO bound
stuff, it usually is a plus.

Thanks.

-- 
tejun
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