linux-kernel - Re: [PATCH 1/4] freezer: make fake_signal_wake_up wake TASK

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Message-ID: <20111011061847.GB1377@ucw.cz>
Date:	Tue, 11 Oct 2011 08:18:48 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	trond.myklebust@...app.com, smfrench@...il.com, rjw@...k.pl,
	linux-pm@...ts.linux-foundation.org, linux-cifs@...r.kernel.org,
	linux-nfs@...r.kernel.org, john@...va.COM,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] freezer: make fake_signal_wake_up wake
 TASK_KILLABLE tasks too


Hi!

> TASK_KILLABLE is often used to put tasks to sleep for quite some time.
> One of the most common uses is to put tasks to sleep while waiting for
> replies from a server on a networked filesystem (such as CIFS or NFS).
> 
> Unfortunately, fake_signal_wake_up does not currently wake up tasks
> that are sleeping in TASK_KILLABLE state. This means that even if the
> code were in place to allow them to freeze while in this sleep, it
> wouldn't work anyway.
> 
> This patch changes this function to wake tasks in this state as well.
> This should be harmless -- if the code doing the sleeping doesn't have
> handling to deal with freezer events, it should just go back to sleep.

I'm pretty sure this will break something; but that does not mean it
is bad idea, just that it should be merged early and tested a lot.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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