linux-kernel - Re: [RFC][PATCH][EXPERIMENTAL] Make kernel threads nonfreezable by default

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Message-Id: <200705282011.37626.rjw@sisk.pl>
Date:	Mon, 28 May 2007 20:11:36 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Oleg Nesterov <oleg@...sign.ru>,
	Maximilian Engelhardt <maxi@...monizer.de>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [RFC][PATCH][EXPERIMENTAL] Make kernel threads nonfreezable by default

On Monday, 28 May 2007 12:30, Pavel Machek wrote:
> Hi!
> 
> > > This patch is on top of the "Freezer: Avoid freezing kernel threads prematurely"
> > > patch that I posted yestarday, available at http://lkml.org/lkml/2007/5/25/199
> > > (updated version that applies cleanly on top of 2.6.22-rc3, is available at
> > > http://www.sisk.pl/kernel/hibernation_and_suspend/2.6.22-rc3/patches/07-freezer-avoid-freezing-kernel-threads-prematurely.patch).
> > > It has been tested on a couple of machines and doesn't seem to break anything.
> > > 
> > > [As you can see there are quite a lot of files affected, so I didn't add all
> > > maintainers of them to the CC list.  In fact, I'm not sure how to handle
> > > notifying them of the change, so please advise.]
> > 
> > Does the lack of comments mean that everyone on the CC list agrees with this
> > approach? ;-)
> > 
> > In the meantime, it turns out that this patch fixes the hibernation/suspend
> > problem with cryptd discussed in the thread at
> > http://lkml.org/lkml/2007/5/26/24 .
> > 
> > The problem is that cryptd doesn't call try_to_freeze() and doesn't set
> > PF_NOFREEZE for itself, so the freezer cannot handle it properly.  In principle
> > we can add either try_to_freeze() or the setting of PF_NOFREEZE to it, but if
> > the approach in the $subject patch is acceptable, we'll need to remove that
> > soon.  So, what should we do?
> 
> I'd add PF_NONFREEZE. Changing the defaults in freezer is obviously
> not 2.6.22 material.

OK

Rafael
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