From: Christoph Lameter <cl@linux.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, linux-mm@kvack.org
Subject: Re: [UnifiedV4 00/16] The Unified slab allocator (V4)
Date: Wed, 6 Oct 2010 10:59:55 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1010061057160.31538@router.home> (raw)
In-Reply-To: <87fwwjha2u.fsf@basil.nowhere.org>
On Wed, 6 Oct 2010, Andi Kleen wrote:
> Christoph Lameter <cl@linux.com> writes:
>
> Not looked at code so far, but just comments based on the
> description. But thanks for working on this, it's good
> to have alternatives to the ugly slab.c
>
> > V3->V4:
> > - Lots of debugging
> > - Performance optimizations (more would be good)...
> > - Drop per slab locking in favor of per node locking for
> > partial lists (queuing implies freeing large amounts of objects
> > to per node lists of slab).
>
> Is that really a good idea? Nodes (= sockets) are getting larger and
> larger and they are quite substantial SMPs by themselves now.
> On Xeon 75xx you have 16 virtual CPUs per node.
True. The shared caches can compensate for that. Without this I got
regression because of too many atomic operations during draining and
refilling.
The other alternative is to stay with the current approach
which minimizes the queuing etc overhead and can affort to have the
overhead.
> > 2. SLUB object expiration is tied into the page reclaim logic. There
> > is no periodic cache expiration.
>
> Hmm, but that means that you could fill a lot of memory with caches
> before they get pruned right? Is there another limit too?
The cache all have an limit on the number of objects in them (like SLAB).
If you want less you can limit the sizes of the queues.
Otherwise there is no other limit.
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next prev parent reply other threads:[~2010-10-06 16:02 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-05 18:57 Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 01/16] slub: Enable sysfs support for !CONFIG_SLUB_DEBUG Christoph Lameter
2010-10-06 14:02 ` Pekka Enberg
2010-10-05 18:57 ` [UnifiedV4 02/16] slub: Move functions to reduce #ifdefs Christoph Lameter
2010-10-06 14:02 ` Pekka Enberg
2010-10-05 18:57 ` [UnifiedV4 03/16] slub: Add per cpu queueing Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 04/16] slub: Allow resizing of per cpu queues Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 05/16] slub: Remove MAX_OBJS limitation Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 06/16] slub: Drop allocator announcement Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 07/16] slub: Object based NUMA policies Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 08/16] slub: Get rid of page lock and rely on per node lock Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 09/16] slub: Shared cache to exploit cross cpu caching abilities Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 10/16] slub: Support Alien Caches Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 11/16] slub: Add a "touched" state to queues and partial lists Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 12/16] slub: Cached object expiration Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 13/16] vmscan: Tie slub object expiration into page reclaim Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 14/16] slub: Reduce size of not performance critical slabs Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 15/16] slub: Detailed reports on validate Christoph Lameter
2010-10-05 18:57 ` [UnifiedV4 16/16] slub: Add stats for alien allocation slowpath Christoph Lameter
2010-10-06 8:01 ` [UnifiedV4 00/16] The Unified slab allocator (V4) Pekka Enberg
2010-10-06 11:03 ` Richard Kennedy
2010-10-06 11:19 ` Pekka Enberg
2010-10-06 15:46 ` Richard Kennedy
2010-10-06 16:21 ` [UnifiedV4 slabinfo 1/2] Move slabinfo.c to tools/slub/slabinfo.c Christoph Lameter
2010-10-06 16:21 ` [UnifiedV4 slabinfo 2/2] slub: update slabinfo.c for queuing Christoph Lameter
2010-10-06 20:56 ` [UnifiedV4 00/16] The Unified slab allocator (V4) Christoph Lameter
2010-10-06 16:00 ` Christoph Lameter
2010-10-06 12:37 ` Wu Fengguang
2010-10-13 2:21 ` Alex,Shi
2010-10-18 18:00 ` Christoph Lameter
2010-10-19 0:01 ` Alex,Shi
2010-10-06 15:56 ` Christoph Lameter
2010-10-13 14:14 ` Mel Gorman
2010-10-18 18:13 ` Christoph Lameter
2010-10-19 9:23 ` Mel Gorman
2010-10-12 18:25 ` Mel Gorman
2010-10-13 7:16 ` Pekka Enberg
2010-10-13 13:46 ` Mel Gorman
2010-10-13 16:10 ` Christoph Lameter
2010-10-06 10:47 ` Andi Kleen
2010-10-06 15:59 ` Christoph Lameter [this message]
2010-10-06 16:25 ` Andi Kleen
2010-10-06 16:37 ` Christoph Lameter
2010-10-06 16:43 ` Andi Kleen
2010-10-06 16:49 ` Christoph Lameter
2010-10-06 16:52 ` Christoph Lameter
2010-10-19 20:39 ` David Rientjes
2010-10-20 13:47 ` Christoph Lameter
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