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

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Message-ID: <20070109094445.GA12773@elte.hu>
Date:	Tue, 9 Jan 2007 10:44:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc:	Andrew Morton <akpm@...l.org>, Oleg Nesterov <oleg@...sign.ru>,
	David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Gautham shenoy <ego@...ibm.com>
Subject: Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist


* Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:

> This thread makes absolutely -no- calls to try_to_freeze() in its 
> lifetime.

that's a plain bug. suspend will fail for example. A kernel thread 
either needs to mark itself PF_NOFREEZE (which means it can be ignored 
and zapped with impunity), or needs to call into try_to_freeze() with a 
sane frequency.

	Ingo
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