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

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Message-Id: <200610242258.34352.rjw@sisk.pl>
Date:	Tue, 24 Oct 2006 22:58:33 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Nigel Cunningham <ncunningham@...uxmail.org>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Use extents for recording what swap is allocated.

On Tuesday, 24 October 2006 22:42, Christoph Hellwig wrote:
> On Mon, Oct 23, 2006 at 02:14:17PM +1000, Nigel Cunningham wrote:
> > 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.
> 
> In addition to the very useful comments from Rafael there's some observations
> of my own:
> 
>  - there's an awful lot of opencoded list manipulation, any chance you
>    could use list.h instead?
>  - what unit are the extent values in?  The usage of unsigned long rings
>    warning bells for me, shouldn't this be something like pgoff_t or
>    sector_t depending on what you describe with it?

These are swap offsets as returned by swp_offset().
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