linux-kernel - Re: [PATCH 09/10] Change table chaining layout

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Message-ID: <20071022235251.656b9cad@the-village.bc.nu>
Date:	Mon, 22 Oct 2007 23:52:51 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	mingo@...e.hu, Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: [PATCH 09/10] Change table chaining layout

On Mon, 22 Oct 2007 16:47:07 -0500
Matt Mackall <mpm@...enic.com> wrote:

> On Mon, Oct 22, 2007 at 05:21:30PM -0400, Jeff Garzik wrote:
> > Alan Cox wrote:
> > >Why can't we just make the list one item longer than the entry count and
> > >stick a NULL on the end of it like normal people ?
> > 
> > Certainly seems safer than the current "let's run off the end of the 
> > list if anything bad happens" setup...  And I do not think allocating 
> > n+1 scatterlist entries will have much of a negative impact.
> 
> It'll mean m-1 scatterlists fit on a slab.

Is that really a credible space issue ?
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