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Date: Wed, 12 Feb 2003 20:01:57 -0800 (PST)
Subject: Re: [Ext2-devel] Re: fsck out of memory
From: "Randy.Dunlap" <rddunlap@osdl.org>
To: <peter@chubb.wattle.id.au>
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>>>>>> "Stephen" == Stephen C Tweedie <sct@redhat.com> writes:
>
> Stephen> Hi, On Tue, 2003-02-11 at 13:11, Stephan van Hienen wrote:
>
> Stephen> I've no idea.  Ben has some lb patches up at
>
> Stephen>   http://people.redhat.com/bcrl/lb/
>
> Stephen> but there's nothing broken out against the latest lbd diffs.
>
>
> Ben's patches are against a very old version of the kernel (2.4.6-pre8) and
> require linking against libgcc to get 64-bit division.
>
>
> The main issue is 64-bit division.  In the limited time I had I
> couldn't convince myself that I could rely on all divisors being less than
> 2^31 in the raid4/5 code.  If you can convince yourself of that, then t's a
> straightforward but tedious task to make raid1, raid4 and raid5 LBD-safe.
> --

Hi,
Is this in a speed-sensitive area?
If not, you could consider 64-bit software divide functions, such as found at
http://nemesis.sourceforge.net/browse/lib/static/intmath/ix86/intmath.c.html,
which would only be used on 32-bit CPUs, of course.

--
~Randy



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