linux-kernel - Re: [PATCH 1/8] PM: Add suspend block api.

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Date:	Fri, 21 May 2010 08:35:39 +0200
From:	Tejun Heo <tj@...nel.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Oleg Nesterov <oleg@...hat.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Magnus Damm <damm@...l.co.jp>,
	Nigel Cunningham <nigel@...onice.net>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Ming Lei <tom.leiming@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/8] PM: Add suspend block api.

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
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