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Date: Fri, 21 May 2010 08:35:39 +0200
From: Tejun Heo <tj@kernel.org>
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
CC: Oleg Nesterov <oleg@redhat.com>,
       =?ISO-8859-1?Q?Arve_Hj=F8nnev=E5g?= <arve@android.com>,
       linux-pm@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
       Alan Stern <stern@rowland.harvard.edu>, Len Brown <len.brown@intel.com>,
       Pavel Machek <pavel@ucw.cz>, Randy Dunlap <rdunlap@xenotime.net>,
       Jesse Barnes <jbarnes@virtuousgeek.org>, Magnus Damm <damm@igel.co.jp>,
       Nigel Cunningham <nigel@tuxonice.net>,
       Cornelia Huck <cornelia.huck@de.ibm.com>,
       Ming Lei <tom.leiming@gmail.com>, Wu Fengguang <fengguang.wu@intel.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Maxim Levitsky <maximlevitsky@gmail.com>, linux-doc@vger.kernel.org
Subject: Re: [PATCH 1/8] PM: Add suspend block api.
References: <1272429119-12103-1-git-send-email-arve@android.com> <20100430172618.GA9043@redhat.com> <4BF4F31D.8070900@kernel.org> <201005210027.31910.rjw@sisk.pl>
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Hello,

On 05/21/2010 12:27 AM, Rafael J. Wysocki wrote:
>> Oh, this isn't an issue w/ cmwq.  While frozen all new works are
>> collected into per-cpu delayed worklist and while frozen trustee in
>> charge of the cpu will keep waiting.  Once thawed, trustee will
>> execute all works including the delayed ones unbound to any cpu.
> 
> So, does it require any intrusive changes to make it possible to create
> multithread freezable workqueues?

cmwq itself is quite intrusive changes but w/ cmwq it just takes
flipping a flag when creating the queue.

Thanks.

-- 
tejun