linux-kernel - Re: Problem with freezable workqueues

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Date:	Wed, 28 Feb 2007 14:40:53 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Gautham R Shenoy <ego@...ibm.com>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Problem with freezable workqueues

On Wed, Feb 28, 2007 at 11:48:59AM +0300, Oleg Nesterov wrote:
> On 02/28, Srivatsa Vaddagiri wrote:
> > We can just thaw the worker thread selectively before kthread_stopping
> > them. This will let us freeze all worker threads (which we want to for
> > hotplug anyway).
> 
> I am not sure this is a good change for 2.6.21.

So we make that change when merging the freezer-based hotplug patchset?

> I strongly believe it is better to change XFS so that it doesn't use
> create_freezeable_workqueue() as Rafael suggested. 

Ok no issues. But when we enable freezer-based hotplug, we expect all
non-singlethreaded worker threads to be frozen (for hotplug atleast).

> Besides, freezeable workqueues are buggy anyway in 2.6.21-rc,
> 
> 	http://marc.theaimsgroup.com/?l=linux-kernel&m=116855740612755
>
> This means that workqueues become non-freezeable after suspend/resume
> anyway (if I understand disable_nonboot_cpus() correctly).

Ah ok. When is the above patch expected to be merged?

-- 
Regards,
vatsa
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