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Date: Mon, 14 May 2007 17:56:15 -0700 (PDT)
From: Alex Dubov <oakad@yahoo.com>
Subject: Re: Freezeable workqueues [Was: 2.6.22-rc1: Broken suspend on SMP with tifm]
To: Oleg Nesterov <oleg@tv-sign.ru>, "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Michal Piotrowski <michal.k.k.piotrowski@gmail.com>,
       Pierre Ossman <drzeus@drzeus.cx>, Pavel Machek <pavel@ucw.cz>,
       Gautham R Shenoy <ego@in.ibm.com>
In-Reply-To: <20070514214833.GA249@tv-sign.ru>
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> 
> > > 	- 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, which is less convenient.


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