linux-kernel - Re: [PATCH] Use extents for recording what swap is allocated.

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Message-ID: <20061023153257.GC8414@elf.ucw.cz>
Date:	Mon, 23 Oct 2006 17:32:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	Nigel Cunningham <ncunningham@...uxmail.org>
Cc:	Andrew Morton <akpm@...l.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Use extents for recording what swap is allocated.

Hi!

> Switch from bitmaps to using extents to record what swap is allocated;
> they make more efficient use of memory, particularly where the allocated
> storage is small and the swap space is large.

> This is also part of the ground work for implementing support for
> supporting multiple swap devices.

bitmaps were more efficient and longer than original code... I did not
_like_ them, but they are in now. I'd hate to change the code again,
for what, 0.5% gain?

...and this is still longer than bitmaps.

And SNAPSHOT_GET_SWAP_PAGE seems to support multiple swap spaces
already.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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