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Date: Tue, 9 Jan 2007 10:44:45 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>, Oleg Nesterov <oleg@tv-sign.ru>,
       David Howells <dhowells@redhat.com>,
       Christoph Hellwig <hch@infradead.org>,
       Linus Torvalds <torvalds@osdl.org>, linux-kernel@vger.kernel.org,
       Gautham shenoy <ego@in.ibm.com>
Subject: Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist
Message-ID: <20070109094445.GA12773@elte.hu>
References: <20070106163035.GA2948@tv-sign.ru> <20070106163851.GA13579@in.ibm.com> <20070106111117.54bb2307.akpm@osdl.org> <20070107110013.GD13579@in.ibm.com> <20070107115957.6080aa08.akpm@osdl.org> <20070107210139.GA2332@tv-sign.ru> <20070108155428.d76f3b73.akpm@osdl.org> <20070109050417.GC589@in.ibm.com> <20070108212656.ca77a3ba.akpm@osdl.org> <20070109093302.GE589@in.ibm.com>
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* Srivatsa Vaddagiri <vatsa@in.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