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

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Message-ID: <20070424202336.GC16503@elf.ucw.cz>
Date:	Tue, 24 Apr 2007 22:23:36 +0200
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: suspend2 merge (was Re: [Suspend2-devel] Re: CFS and suspend2: hang in atomic copy)

Hi!

> > From subsequent emails, I think you already got your answer, but just 
> > in case...
> > 
> > Yes, if you enabled "Replace swsusp by default" and you already had it 
> > set up for getting swsusp to resume. If not, and you're using an 
> > initrd/ramfs, you'll need to modify it to echo
> > > /sys/power/suspend2/do_resume after /sys and /proc are mounted but
> > prior to mounting / and so on.
> 
> yeah, went with the default suggested by your patch:
> 
>    CONFIG_SUSPEND2_REPLACE_SWSUSP=y
> 
> and it was pretty easy to set things up. I used "echo disk > 
> /sys/power/state" to trigger it.
> 
> In hindsight it was all pretty straightforward and suspend2 worked 
> beautifully on an UP and on an SMP system i tried. So in exchange for 
> suspend2 folks debugging a bug in CFS here's some suspend2 review 
> feedback ;) Any plans about moving suspend2 to the upstream kernel? It 
> should be pretty easy for it to co-exist with the current swsuspend 
> code.

Well, current uswsusp code can do most of stuff suspend2 can do, with
20% (or so) of kernel code. 

"Major feature" that is missing is ability to save 100% of memory if
it is all the pagecache. I think that is not that important; we have
200 line patch to do that, but noone was able to verify it is correct.

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