linux-kernel - Re: Freezeable workqueues [Was: 2.6.22-rc1: Broken suspend on SMP with tifm]

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Message-Id: <200705152254.28911.rjw@sisk.pl>
Date:	Tue, 15 May 2007 22:54:27 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alex Dubov <oakad@...oo.com>
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Pierre Ossman <drzeus@...eus.cx>, Pavel Machek <pavel@....cz>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: Freezeable workqueues [Was: 2.6.22-rc1: Broken suspend on SMP with tifm]

On Tuesday, 15 May 2007 02:56, Alex Dubov wrote:
> > 
> > > > 	- Do we need freezeable workqueues ?
> > > 
> > > Well, we have at least one case in which they appear to be useful.
> > 
> 
> I need freezeable wq exactly for the fact that they are synchronized with suspend/resume. My
> workitem may do device_register/unregister and it can (and will be) scheduled from irq handler
> during resume. As far as I understand, before freezeable wqs, kthreads were the only way to
> achieve this behavior,

That's correct.

> which is less convenient.

Thanks for the explanation. 

Greetings,
Rafael
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