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

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Date:	Wed, 9 Aug 2006 13:27:01 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...l.org>
Subject: Re: [RFC][PATCH -mm 1/5] swsusp: Introduce memory bitmaps

Hi!

> > > 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? I see it
> > enables you to do some cleanups... but could we get those cleanups
> > without those 500 lines? :-).
> 
> Out of the 500 lines, something like 100 are comments and other 50 are
> definitions of structures. ;-)

Yes, and of the 100 lines of comments, 10 are fixmes :-).

> Seriously speaking, I could do that without the bitmaps, but the code wouldn't
> be that much shorter.  Apart from this, I would need to introduce yet another
> type of PBEs (for storing pfns) and try not to get lost in the resulting mess.
> 
> Instead of doing this I prefer to add some extra code to set up a decent data
> structure and just use it.

Okay, I guess that if we need to change the structure anyway, we may
well use the effective structure...

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