linux-kernel - Re: [PATCH 4/4] sched: add hooks for workqueue

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Message-ID: <1275292867.27810.21442.camel@twins>
Date:	Mon, 31 May 2010 10:01:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 4/4] sched: add hooks for workqueue

On Thu, 2010-05-13 at 12:48 +0200, Tejun Heo wrote:
> Concurrency managed workqueue needs to know when workers are going to
> sleep and waking up, and, when a worker goes to sleep, be able to wake
> up another worker to maintain adequate concurrency.  This patch
> introduces PF_WQ_WORKER to identify workqueue workers and adds the
> following two hooks.
> 
> * wq_worker_waking_up(): called when a worker is woken up.
> 
> * wq_worker_sleeping(): called when a worker is going to sleep and may
>   return a pointer to a local task which should be woken up.  The
>   returned task is woken up using try_to_wake_up_local() which is
>   simplified ttwu which is called under rq lock and can only wake up
>   local tasks.

This changelog seems to lack explanation for why you need the wakeup
callback.
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