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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Date:	Mon, 4 May 2009 11:33:10 +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)

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