linux-kernel - Re: [RFC][PATCH -mm 1/5] swsusp: Introduce memory bitmaps

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Date:	Wed, 9 Aug 2006 14:11:59 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...l.org>
Subject: Re: [RFC][PATCH -mm 1/5] swsusp: Introduce memory bitmaps

On Wednesday 09 August 2006 13:53, Pavel Machek wrote:
> On Wed 2006-08-09 13:36:16, Rafael J. Wysocki wrote:
> > Hi,
> > 
> > On Wednesday 09 August 2006 13:27, Pavel Machek wrote:
> > > > > > Introduce the memory bitmap data structure and make swsusp use in the suspend
> > > > > > phase.
> > > > > > 
> > > > > > The current swsusp's internal data structure is not very efficient from the
> > > > > > memory usage point of view, so it seems reasonable to replace it with a data
> > > > > > structure that will require less memory, such as a pair of bitmaps.
> > > > > 
> > > > > Well, 500 lines of code  for what... 0.25% bigger image?
> > 
> > BTW, that depends on the total size of RAM.  On a 1.5 GB i386 box that would
> > be something like 100%.
> 
> Well, well, but 99.75% of that is from 3/5 patch, and we could still
> get those 99.75% without bitmaps, right?

Yes.  I meant the total gain from all of the changes.  [The highmem one would
be quite difficult without bitmaps, I think, because the bitmaps give us the
right ordering of pages automatically.]

Rafael
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