linux-kernel - Re: [RFC][PATCH] PM / Hibernate: Add sysfs knob to control size of memory for drivers

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Message-ID: <20110518183638.GA8887@elf.ucw.cz>
Date:	Wed, 18 May 2011 20:36:38 +0200
From:	Pavel Machek <pavel@....cz>
To:	Martin Steigerwald <Martin@...htvoll.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] PM / Hibernate: Add sysfs knob to control size of
 memory for drivers

Hi!

> > > OK, there are no comments, so my understanding is that everyone is
> > > fine with this patch and I can add it to my linux-next branch.
> > 
> > Actually no, I don't like it. Yes, knob might be useful for debugging,
> > but having it as part of official kernel interface...
> 
> Well I and people with similar setups it is actually quite useful. It 
> makes the difference between does hibernate *every time* versus does not 
> hibernate sometimes. And I don't see why it can't go again, when the issue 
> is taken care of elsewise in the future. I think that autotuning / drivers 
> allocating their memory via whatnot is better, but until such a mechanism 
> is agreed, developed and included in official kernel I do think that this 
> knob does help.

Yes, autotuning would be better, and yes, knob is useful for you now.

I'd say the knob is for debugging and should go to debugfs somewhere.

> I think missing is some documentation so that the advanced user can figure 
> out this knob.

...so we can easily delete the knob when it is no longer neccessary.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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