linux-kernel - Re: Problem with freezable workqueues

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Message-Id: <1172619412.3681.11.camel@johannes.berg>
Date:	Wed, 28 Feb 2007 00:36:52 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Gautham R Shenoy <ego@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: Problem with freezable workqueues

On Wed, 2007-02-28 at 02:28 +0300, Oleg Nesterov wrote:

> Ugh. I know nothing, nothing, nothing about suspend. I'll try to guess.
> 
>    Commit: ed746e3b18f4df18afa3763155972c5835f284c5

> Yes? with the patch above, _cpu_down() called _after_ freeze_processes() ???

perfect :)
See also my original mail and the thread:
http://thread.gmane.org/gmane.linux.power-management.general/4314

> How about other kthread_stop()s ? For example, kernel/softirq.c:cpu_callback() ?

I'd they should be affected as well. For me, I guess I haven't run into
them because xfs is enough to freeze the box ;) As for Rafael, I don't
know why he isn't seeing that... I haven't been able to test this patch
on my quad powermac so far unfortunately, been sick and away from the
machine. I'll probably be able to test tomorrow.

> I think we need a general "cpu_down() after freeze" implementation,

Yeah, I'd think so.

>  this is what
> Gautham and Srivatsa are working on, right?

That I don't know.

johannes

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