linux-kernel - Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Message-Id: <E1I6huk-0003AH-00@dorka.pomaz.szeredi.hu>
Date:	Fri, 06 Jul 2007 09:07:38 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	pavel@....cz
CC:	miklos@...redi.hu, oliver@...kum.org, paulus@...ba.org,
	stern@...land.harvard.edu, johannes@...solutions.net, rjw@...k.pl,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	mjg59@...f.ucam.org, benh@...nel.crashing.org
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

> > Actually fuse allows SIGKILL, because it's always fatal, and the
> > syscall may not be restarted.
> 
> Okay, and you should handle refrigerator in the same paths where you
> handle SIGKILL. Just add try_to_freeze() there...

It's the fourth time I'm repeating this in this thread:

Yes adding try_to_freeze() there would partially solve the probelem.

But another task can be sleeping on a mutex held by the task waiting
for the reply.  And the freezer won't be able to handle that one.

Generally, calling try_to_freeze() with mutexes held is not a good
idea.

Miklos
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