linux-kernel - Re: [PATCH 0/4] PM: Drop shrink_all_memory (rev. 2) (was: Re: [PATCH 3/3] PM/Hibernate: Use memory allocations to free memory)

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Message-ID: <20090504202711.GA7258@elf.ucw.cz>
Date:	Mon, 4 May 2009 22:27:11 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, jens.axboe@...cle.com,
	alan-jenkins@...fmail.co.uk, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 0/4] PM: Drop shrink_all_memory (rev. 2) (was: Re:
	[PATCH 3/3] PM/Hibernate: Use memory allocations to free memory)

On Mon 2009-05-04 21:53:36, Rafael J. Wysocki wrote:
> On Monday 04 May 2009, Pavel Machek wrote:
> > Hi!
> > 
> > > I know that swsusp_shrink_memory() has problems, that's why I'd like to get rid
> > > of it.
> > > 
> > > > I wonder if it's possible to free up the memory within 1s at all.
> > > 
> > > I'm not sure.
> > > 
> > > Apparently, the counting of saveable pages takes substantial time (0.5 s each
> > > iteration on my 64-bit test box), so we can improve that by limiting the number
> > > of iterations.
> > 
> > We could increase step size after each step. Free in 40MB step, then
> > 80MB step, then 160MB step, ...
> 
> Why not just one step?  It doesn't seem to hurt performance AFAICS.

One step is obviously fine, too. 
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
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