linux-kernel - Re: [PATCH 2/3] work_on_cpu: Use our own workqueue.

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Message-ID: <20090126223703.GA5508@redhat.com>
Date:	Mon, 26 Jan 2009 23:37:03 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, a.p.zijlstra@...llo.nl,
	rusty@...tcorp.com.au, travis@....com, mingo@...hat.com,
	davej@...hat.com, cpufreq@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] work_on_cpu: Use our own workqueue.

On 01/26, Ingo Molnar wrote:
>
> Andrew's suggestion does make sense though: for any not-in-progress
> worklet we can dequeue that worklet and execute it in the flushing
> context. [ And if that worklet cannot be dequeued because it's being
> processed then that's fine and we can wait on that single worklet, without
> waiting on any other 'unrelated' worklets. ]

Yes sure. This is easy, and I am not sure we need the special handler.
If the caller wants this behaviour, it can do:

	if (cancel_work_sync(work))
		work->func(work);

But flush_work() was specially introduced for the case when we can't
do the above,

> That does not help work_on_cpu() though: that facility really uses the
> fact that workqueues are implemented via per CPU threads - hence we cannot
> remove the worklet from the queue and execute it in the flushing context.

Yes.

Oleg.

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