linux-kernel - Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

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Message-ID: <20070425203150.GD17387@elf.ucw.cz>
Date:	Wed, 25 Apr 2007 22:31:50 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>, Ingo Molnar <mingo@...e.hu>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Christian Hesse <mail@...thworm.de>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	suspend2-devel@...ts.suspend2.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

Hi!

> > > > > .. but if the alternative is a feature that just isn't worth it, and 
> > > > > likely to not only have its own bugs, but cause bugs elsewhere? (And yes, 
> > > > > I believe STD is both of those. There's a reason it's called "STD". Go 
> > > > > to google and type "STD" and press "I'm feeling lucky". Google is God).
> > > > 
> > > > Is there really no use case for STD?
> 
> [--snip--]
> > > So my objections to STD have nothing to do with saving state and shutting 
> > > down. They have everything to do with the fact that it is not - and will 
> > > never be - a "suspend", and it shouldn't affect suspend.
> > 
> > STD needs to snapshot system, and then it needs devices to be
> > suspended so that snapshot is consistent.
> 
> Not suspended.  _Frozen_.  In fact don't want any DMA transfers or interrupts
> to take place when we're creating the image.  That's all and that's what we're
> doing (or rather, trying to do).

Yep, _frozen_. That's the right word.

> So, the "suspend" and "resume" for the functions being called for that are
> wrong, but then we call them with PMSG_FREEZE. ;-)  Still, we could add
> .freeze() and .thaw() callbacks for hibernation just fine.  This wouldn't even
> be that difficult ...

It would be ugly big patch I'm afraid.

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