From: Christoph Lameter <cl@linux.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>, Pekka Enberg <penberg@kernel.org>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Matt Mackall <mpm@selenic.com>
Subject: Re: [PATCH] mm-slab: allocate kmem_cache with __GFP_REPEAT
Date: Wed, 20 Jul 2011 09:52:03 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1107200950270.1472@router.home> (raw)
In-Reply-To: <1311170893.2338.29.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
On Wed, 20 Jul 2011, Eric Dumazet wrote:
> > Slab's kmem_cache is configured with an array of NR_CPUS which is the
> > maximum nr of cpus supported. Some distros support 4096 cpus in order to
> > accomodate SGI machines. That array then will have the size of 4096 * 8 =
> > 32k
>
> We currently support a dynamic schem for the possible nodes :
>
> cache_cache.buffer_size = offsetof(struct kmem_cache, nodelists) +
> nr_node_ids * sizeof(struct kmem_list3 *);
>
> We could have a similar trick to make the real size both depends on
> nr_node_ids and nr_cpu_ids.
>
> (struct kmem_cache)->array would become a pointer.
We should be making it a per cpu pointer like slub then. I looked at what
it would take to do so a couple of month ago but it was quite invasive.
The other solution is to use slub instead.
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next prev parent reply other threads:[~2011-07-20 14:52 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-20 12:16 Konstantin Khlebnikov
2011-07-20 13:14 ` Pekka Enberg
2011-07-20 13:28 ` Konstantin Khlebnikov
2011-07-20 13:42 ` Pekka Enberg
2011-07-20 13:50 ` Konstantin Khlebnikov
2011-07-20 13:53 ` Pekka Enberg
2011-07-20 15:36 ` Christoph Lameter
2011-07-20 13:59 ` Konstantin Khlebnikov
2011-07-20 13:54 ` Christoph Lameter
2011-07-20 14:20 ` Mel Gorman
2011-07-20 14:32 ` Konstantin Khlebnikov
2011-07-20 14:40 ` Eric Dumazet
2011-07-20 14:47 ` Konstantin Khlebnikov
2011-07-20 13:43 ` Mel Gorman
2011-07-20 13:56 ` Christoph Lameter
2011-07-20 14:08 ` Eric Dumazet
2011-07-20 14:52 ` Christoph Lameter [this message]
2011-07-20 15:09 ` Eric Dumazet
2011-07-20 15:34 ` Christoph Lameter
2011-07-20 15:56 ` Eric Dumazet
2011-07-20 16:17 ` Christoph Lameter
2011-07-20 16:31 ` Eric Dumazet
2011-07-20 17:04 ` Eric Dumazet
2011-07-20 17:13 ` Christoph Lameter
2011-07-20 17:28 ` Pekka Enberg
2011-07-20 17:37 ` Christoph Lameter
2011-07-20 17:41 ` Pekka Enberg
2011-07-20 18:07 ` Matt Mackall
2011-07-21 7:18 ` Konstantin Khlebnikov
2011-07-20 19:09 ` Mel Gorman
2011-07-31 11:41 ` Konstantin Khlebnikov
2011-07-31 11:44 ` Pekka Enberg
2011-07-21 8:43 ` Eric Dumazet
2011-07-21 15:27 ` Christoph Lameter
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