From: Christoph Lameter <cl@linux-foundation.org>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
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: Thu, 23 Oct 2008 10:39:58 -0500 (CDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0810231035510.17638@quilx.com> (raw)
In-Reply-To: <49009575.60004@cosmosbay.com>
On Thu, 23 Oct 2008, Eric Dumazet wrote:
> At alloc time, I remember I added a prefetchw() call in SLAB in
> __cache_alloc(),
> this could explain some differences between SLUB and SLAB too, since SLAB
> gives a hint to processor to warm its cache.
SLUB touches objects by default when allocating. And it does it
immediately in slab_alloc() in order to retrieve the pointer to the next
object. So there is no point of hinting there right now.
If we go to the pointer arrays then the situation is similar to SLAB where
the object is not touched by the allocator. Then the hint would be useful
again.
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next prev parent reply other threads:[~2008-10-23 15:39 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 [this message]
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
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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