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: <200905042153.37069.rjw@sisk.pl>
Date:	Mon, 4 May 2009 21:53:36 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
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 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.

Thanks,
Rafael
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