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From: Nick Piggin <npiggin@suse.de>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	linux-mm@kvack.org
Subject: Re: [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator
Date: Tue, 25 May 2010 12:06:30 +1000	[thread overview]
Message-ID: <20100525020629.GA5087@laptop> (raw)
In-Reply-To: <alpine.DEB.2.00.1005240852580.5045@router.home>

On Mon, May 24, 2010 at 10:06:08AM -0500, Christoph Lameter wrote:
> On Mon, 24 May 2010, Nick Piggin wrote:
> 
> > Well I'm glad you've conceded that queues are useful for high
> > performance computing, and that higher order allocations are not
> > a free and unlimited resource.
> 
> Ahem. I have never made any such claim and would never make them. And
> "conceding" something ???

Well, you were quite vocal about the subject.

 
> The "unqueueing" was the result of excessive queue handling in SLAB due and
> the higher order allocations are a natural move in HPC to gain performance.

This is the kind of handwavings that need to be put into a testable
form. I repeatedly asked you for examples of where the jitter is
excessive or where the TLB improvements help, but you never provided
any testable case. I'm not saying they don't exist, but we have to be
reational about this.

 
> > I hope we can move forward now with some objective, testable
> > comparisons and criteria for selecting one main slab allocator.
> 
> If can find criteria that are universally agreed upon then yes but that is
> doubtful.

I think we can agree that perfect is the enemy of good, and that no
allocator will do the perfect thing for everybody. I think we have to
come up with a way to a single allocator.

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  reply	other threads:[~2010-05-25  6:40 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-05-21 21:14 [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator Christoph Lameter
2010-05-21 21:14 ` [RFC V2 SLEB 01/14] slab: Introduce a constant for a unspecified node Christoph Lameter
2010-06-07 21:44   ` David Rientjes
2010-06-07 22:30     ` Christoph Lameter
2010-06-08  5:41       ` Pekka Enberg
2010-06-08  6:20         ` David Rientjes
2010-06-08  6:34           ` Pekka Enberg
2010-06-08 23:35             ` David Rientjes
2010-06-09  5:55               ` Pekka Enberg
2010-06-09  5:55                 ` Pekka Enberg
2010-06-09  6:20                 ` David Rientjes
2010-06-09  6:20                   ` David Rientjes
2010-05-21 21:14 ` [RFC V2 SLEB 02/14] SLUB: Constants need UL Christoph Lameter
2010-05-21 21:14 ` [RFC V2 SLEB 03/14] SLUB: Use kmem_cache flags to detect if Slab is in debugging mode Christoph Lameter
2010-06-08  3:57   ` David Rientjes
2010-05-21 21:14 ` [RFC V2 SLEB 04/14] SLUB: discard_slab_unlock Christoph Lameter
2010-05-21 21:14 ` [RFC V2 SLEB 05/14] SLUB: is_kmalloc_cache Christoph Lameter
2010-06-08  8:54   ` David Rientjes
2010-05-21 21:14 ` [RFC V2 SLEB 06/14] SLUB: Get rid of the kmalloc_node slab Christoph Lameter
2010-06-09  6:14   ` David Rientjes
2010-06-09 16:14     ` Christoph Lameter
2010-06-09 16:26       ` Pekka Enberg
2010-06-10  6:07         ` Pekka Enberg
2010-05-21 21:14 ` [RFC V2 SLEB 07/14] SLEB: The Enhanced Slab Allocator Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 08/14] SLEB: Resize cpu queue Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 09/14] SLED: Get rid of useless function Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 10/14] SLEB: Remove MAX_OBJS limitation Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 11/14] SLEB: Add per node cache (with a fixed size for now) Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 12/14] SLEB: Make the size of the shared cache configurable Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 13/14] SLEB: Enhanced NUMA support Christoph Lameter
2010-05-21 21:15 ` [RFC V2 SLEB 14/14] SLEB: Allocate off node objects from remote shared caches Christoph Lameter
2010-05-22  8:37 ` [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator Pekka Enberg
2010-05-24  7:03 ` Nick Piggin
2010-05-24 15:06   ` Christoph Lameter
2010-05-25  2:06     ` Nick Piggin [this message]
2010-05-25  6:55       ` Pekka Enberg
2010-05-25  7:07         ` Nick Piggin
2010-05-25  8:03           ` Pekka Enberg
2010-05-25  8:03             ` Pekka Enberg
2010-05-25  8:16             ` Nick Piggin
2010-05-25  8:16               ` Nick Piggin
2010-05-25  9:19               ` Pekka Enberg
2010-05-25  9:19                 ` Pekka Enberg
2010-05-25  9:34                 ` Nick Piggin
2010-05-25  9:34                   ` Nick Piggin
2010-05-25  9:53                   ` Pekka Enberg
2010-05-25  9:53                     ` Pekka Enberg
2010-05-25 10:19                     ` Nick Piggin
2010-05-25 10:19                       ` Nick Piggin
2010-05-25 10:45                       ` Pekka Enberg
2010-05-25 10:45                         ` Pekka Enberg
2010-05-25 11:06                         ` Nick Piggin
2010-05-25 11:06                           ` Nick Piggin
2010-05-25 15:13                         ` Linus Torvalds
2010-05-25 15:13                           ` Linus Torvalds
2010-05-25 15:43                           ` Nick Piggin
2010-05-25 15:43                             ` Nick Piggin
2010-05-25 17:02                             ` Pekka Enberg
2010-05-25 17:02                               ` Pekka Enberg
2010-05-25 17:19                               ` Nick Piggin
2010-05-25 17:19                                 ` Nick Piggin
2010-05-25 17:35                                 ` Pekka Enberg
2010-05-25 17:35                                   ` Pekka Enberg
2010-05-25 17:40                                   ` Nick Piggin
2010-05-25 17:40                                     ` Nick Piggin
2010-05-25 10:07               ` David Rientjes
2010-05-25 10:07                 ` David Rientjes
2010-05-25 10:02             ` David Rientjes
2010-05-25 10:02               ` David Rientjes
2010-05-25 10:47               ` Pekka Enberg
2010-05-25 10:47                 ` Pekka Enberg
2010-05-25 19:57                 ` David Rientjes
2010-05-25 19:57                   ` David Rientjes
2010-05-25 14:13       ` Christoph Lameter
2010-05-25 14:34         ` Nick Piggin
2010-05-25 14:43           ` Nick Piggin
2010-05-25 14:48           ` Christoph Lameter
2010-05-25 15:11             ` Nick Piggin
2010-05-25 15:28               ` Christoph Lameter
2010-05-25 15:37                 ` Nick Piggin
2010-05-27 14:24                   ` Christoph Lameter
2010-05-27 14:37                     ` Nick Piggin
2010-05-27 15:52                       ` Christoph Lameter
2010-05-27 16:07                         ` Nick Piggin
2010-05-27 16:57                           ` Christoph Lameter
2010-05-28  8:39                             ` Nick Piggin
2010-05-25 14:40         ` Nick Piggin
2010-05-25 14:48           ` Christoph Lameter
2010-05-25 15:12             ` Nick Piggin

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