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Date: Mon, 14 May 2007 17:56:15 -0700 (PDT)
From: Alex Dubov <oakad@...oo.com>
To: Oleg Nesterov <oleg@...sign.ru>, "Rafael J. Wysocki" <rjw@...k.pl>
Cc: 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]
>
> > > - 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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