linux-kernel - Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

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Message-ID: <20070117161207.GE26211@in.ibm.com>
Date:	Wed, 17 Jan 2007 21:42:07 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...l.org>, David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Gautham shenoy <ego@...ibm.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

On Wed, Jan 17, 2007 at 06:47:16PM +0300, Oleg Nesterov wrote:
> > What do you mean by "currently" executing work? worker thread executing
> > some work on the cpu? That is not possible, because all threads are
> > frozen at this point. There cant be any ongoing flush_workxxx() as well
> > because of this, which should avoid breaking flush_workxxx() ..
> 
> work->func() sleeps/freezed. 

Didnt Andrew call that (work->func calling try_to_freeze) madness?

	http://lkml.org/lkml/2007/01/07/166

Does that happen in practice?

-- 
Regards,
vatsa
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