From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Christoph Lameter <cl@linux-foundation.org>,
Miklos Szeredi <miklos@szeredi.hu>,
nickpiggin@yahoo.com.au, hugh@veritas.com, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org
Subject: Re: SLUB defrag pull request?
Date: Tue, 28 Oct 2008 13:06:23 +0200 [thread overview]
Message-ID: <1225191983.27477.16.camel@penberg-laptop> (raw)
In-Reply-To: <4900B0EF.2000108@cosmosbay.com>
On Thu, 2008-10-23 at 19:14 +0200, Eric Dumazet wrote:
> [PATCH] slub: slab_alloc() can use prefetchw()
>
> Most kmalloced() areas are initialized/written right after allocation.
>
> prefetchw() gives a hint to cpu saying this cache line is going to be
> *modified*, even if first access is a read.
>
> Some architectures can save some bus transactions, acquiring
> the cache line in an exclusive way instead of shared one.
>
> Same optimization was done in 2005 on SLAB in commit
> 34342e863c3143640c031760140d640a06c6a5f8
> ([PATCH] mm/slab.c: prefetchw the start of new allocated objects)
>
> Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Christoph, I was sort of expecting a NAK/ACK from you before merging
this. I would be nice to have numbers on this but then again I don't see
how this can hurt either.
Pekka
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next prev parent reply other threads:[~2008-10-28 11:06 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1223883004.31587.15.camel@penberg-laptop>
[not found] ` <1223883164.31587.16.camel@penberg-laptop>
[not found] ` <Pine.LNX.4.64.0810131227120.20511@blonde.site>
2008-10-13 12:54 ` Nick Piggin
2008-10-13 13:59 ` Miklos Szeredi
2008-10-13 14:27 ` Miklos Szeredi
2008-10-13 16:35 ` Christoph Lameter
2008-10-13 14:49 ` Miklos Szeredi
2008-10-13 15:22 ` Miklos Szeredi
2008-10-20 14:59 ` Christoph Lameter
2008-10-20 18:01 ` Miklos Szeredi
2008-10-20 18:22 ` Christoph Lameter
2008-10-20 18:40 ` Miklos Szeredi
2008-10-20 19:11 ` Christoph Lameter
2008-10-20 19:28 ` Miklos Szeredi
2008-10-20 19:53 ` Christoph Lameter
2008-10-20 20:50 ` Miklos Szeredi
2008-10-21 23:17 ` Christoph Lameter
2008-10-22 7:10 ` Miklos Szeredi
2008-10-22 15:42 ` Christoph Lameter
2008-10-22 19:46 ` Miklos Szeredi
2008-10-22 19:54 ` Christoph Lameter
2008-10-22 20:11 ` Miklos Szeredi
2008-10-22 20:19 ` Christoph Lameter
2008-10-22 20:26 ` Miklos Szeredi
2008-10-22 20:48 ` Pekka Enberg
2008-10-22 21:01 ` Christoph Lameter
2008-10-22 21:04 ` Miklos Szeredi
2008-10-22 21:12 ` Pekka Enberg
2008-10-22 21:28 ` Christoph Lameter
2008-10-22 22:10 ` Miklos Szeredi
2008-10-22 23:20 ` Christoph Lameter
2008-10-23 7:10 ` Pekka Enberg
2008-10-23 8:38 ` Miklos Szeredi
2008-10-23 13:40 ` Christoph Lameter
2008-10-23 13:58 ` Pekka Enberg
2008-10-23 14:09 ` Christoph Lameter
2008-10-23 14:14 ` Pekka Enberg
2008-10-23 14:25 ` Christoph Lameter
2008-10-23 15:17 ` Eric Dumazet
2008-10-23 15:39 ` Christoph Lameter
2008-10-23 16:35 ` Eric Dumazet
2008-10-23 16:47 ` Christoph Lameter
2008-10-23 17:14 ` Eric Dumazet
2008-10-28 11:06 ` Pekka Enberg [this message]
2008-10-28 11:19 ` Nick Piggin
2008-10-30 15:45 ` Christoph Lameter
2008-10-22 20:59 ` Christoph Lameter
2008-10-20 23:04 ` Dave Chinner
2008-10-13 16:24 ` Christoph Lameter
2008-10-13 14:28 ` Miklos Szeredi
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