linux-kernel - Re: [PATCH 2/5] workqueue: change value of lcpu in queue_delayed_work

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Message-ID: <20120813163219.GA9180@google.com>
Date:	Mon, 13 Aug 2012 09:32:19 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] workqueue: change value of lcpu in
 queue_delayed_work_on()

Hello,

On Tue, Aug 14, 2012 at 01:17:49AM +0900, Joonsoo Kim wrote:
> We assign cpu id into work struct in queue_delayed_work_on().
> In current implementation, when work is come in first time,
> current running cpu id is assigned.
> If we do queue_delayed_work_on() with CPU A on CPU B,
> __queue_work() invoked in delayed_work_timer_fn() go into sub-optimal path
> in case of WQ_NON_REENTRANT.
> Change it to cpu argument is prevent to go into sub-optimal path.

Which part is suboptimal?  Also, what if @cpu is WQ_UNBOUND?

Thanks.

-- 
tejun
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