linux-kernel - Re: [PATCH] slub: prefetch next freelist pointer in slab

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Date:	Mon, 30 Jan 2012 22:32:53 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>,
	"Alex,Shi" <alex.shi@...el.com>, Shaohua Li <shaohua.li@...el.com>,
	Matt Mackall <mpm@...enic.com>,
	Linux-Next <linux-next@...r.kernel.org>
Subject: Re: [PATCH] slub: prefetch next freelist pointer in slab_alloc()

On Tue, Jan 24, 2012 at 20:54, Pekka Enberg <penberg@...nel.org> wrote:
> On Fri, 16 Dec 2011, Eric Dumazet wrote:
>>> Recycling a page is a problem, since freelist link chain is hot on
>>> cpu(s) which freed objects, and possibly very cold on cpu currently
>>> owning slab.
>
> On Fri, 16 Dec 2011, Christoph Lameter wrote:
>> Good idea. How do the tcp benchmarks look after this?
>>
>> Looks sane.
>>
>> Acked-by: Christoph Lameter <cl@...ux.com>
>
> Applied, thanks!

m68k/allmodconfig at http://kisskb.ellerman.id.au/kisskb/buildresult/5527349/

mm/slub.c:274: error: implicit declaration of function 'prefetch'

Sorry, didn't notice it earlier due to other build breakage in -next.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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