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

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Date:	Wed, 25 Apr 2007 10:48:57 +0300
From:	Dumitru Ciobarcianu <Dumitru.Ciobarcianu@...S.RO>
To:	Pavel Machek <pavel@....cz>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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)

On Wed, 2007-04-25 at 07:29 +0000, Pavel Machek wrote:
> > userspace-driven-suspend is already in the kernel, today. So it's not 
> > really "two versions side by side doing the same thing", but more of:
> > 
> >            A B C + D E F G H
> > 
> > where "ABC" is used by the uswsusp code today, and "ABCDEFGH" is used by 
> > suspend2. So any "suspend2 merge" would largely be about adding "DEFGH". 
> 
> Actually, we have 'D H' in kernel, today. It is called swsusp...
> (Encryption, swapFile support and Graphical progress are missing from
> today's kernel.)

Please stop using FUD. 
Graphical progress it's not in the kernel, even with suspend2.

> 
> > My original mail was about the following thing: i tried the suspend2 
> > patch (which just makes "echo disk > /sys/power/state" work as expected, 
> > as long as you give the booting up kernel image an idea about where the 
> 
> ..and it means that 'echo disk > ...' should work w/o suspend2 patch,
> too. (Just try it). You'll miss compression part, but that provides
> only small speedup.

I beg to differ:
  Compressed 904687616 bytes into 418828687 (53 percent compression).

Almost 500mb less to write (did I mention it writes the full image?).
Now imagine the time it takes to write that with those pesky 4200rpm
laptop hdds.

-- 
Cioby

"Mr Linus, how do you debug the kernel, what tools do you use?"
"Ever heard of prinf ?"
(From an presentation at the "Politehnica" University of Bucharest, 1995)

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