From: Tejun Heo <tj@kernel.org>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Heinz Diehl <htd@fancy-poultry.org>,
Pekka Enberg <penberg@cs.helsinki.fi>,
linux-mm@kvack.org, Nick Piggin <npiggin@suse.de>,
David Rientjes <rientjes@google.com>,
linux-kernel@vger.kernel.org
Subject: Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR
Date: Wed, 14 Jul 2010 13:51:21 +0200 [thread overview]
Message-ID: <4C3DA4B9.1060206@kernel.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1007132055470.14067@router.home>
Hello,
On 07/14/2010 04:01 AM, Christoph Lameter wrote:
> I dont see anything in there at first glance that would cause slub to
> increase its percpu usage. This is straight upstream?
It's basically checking constant expressions there and
PERCPU_DYNAMIC_EARLY_SIZE is defined as 12k, so slub is thinking that
it's gonna use more memory on that build.
> Try to just comment out the BUILD_BUG_ON. I had it misfire before and
> fixed the formulae to no longer give false positives. Maybe that is
> another case. Tejun wanted that but never was able to give me an exact
> formular to check for.
Yeah, unfortunately, due to alignment requirements, it can't be
determined with accuracy. We'll just have to size it sufficiently.
> At the Ottawa Linux Symposium right now so responses may be delayed.
> Hotels Internet connection keeps getting clogged for some reason.
I'm in suse labs conf until next week so I don't think I'll be doing
much till then either.
Thanks.
--
tejun
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next prev parent reply other threads:[~2010-07-14 11:51 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-09 19:07 [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR Christoph Lameter
2010-07-09 19:07 ` [S+Q2 01/19] Bugfix for semop() not reporting successful operation Christoph Lameter
2010-07-09 19:07 ` [S+Q2 02/19] percpu: make @dyn_size always mean min dyn_size in first chunk init functions Christoph Lameter
2010-07-09 19:07 ` [S+Q2 03/19] percpu: allow limited allocation before slab is online Christoph Lameter
2010-07-09 19:07 ` [S+Q2 04/19] slub: Use a constant for a unspecified node Christoph Lameter
2010-07-09 19:07 ` [S+Q2 05/19] SLUB: Constants need UL Christoph Lameter
2010-07-09 19:07 ` [S+Q2 06/19] slub: Check kasprintf results in kmem_cache_init() Christoph Lameter
2010-07-14 22:16 ` David Rientjes
2010-07-09 19:07 ` [S+Q2 07/19] slub: Allow removal of slab caches during boot Christoph Lameter
2010-07-14 23:48 ` David Rientjes
2010-07-19 0:07 ` Benjamin Herrenschmidt
2010-07-19 16:39 ` Christoph Lameter
2010-07-31 9:41 ` Pekka Enberg
2010-08-02 15:36 ` Christoph Lameter
2010-08-03 4:32 ` Pekka Enberg
2010-07-09 19:07 ` [S+Q2 08/19] slub: Use kmem_cache flags to detect if slab is in debugging mode Christoph Lameter
2010-07-09 19:07 ` [S+Q2 09/19] slub: discard_slab_unlock Christoph Lameter
2010-07-09 19:07 ` [S+Q2 10/19] slub: remove dynamic dma slab allocation Christoph Lameter
2010-07-09 19:07 ` [S+Q2 11/19] slub: Remove static kmem_cache_cpu array for boot Christoph Lameter
2010-07-09 19:07 ` [S+Q2 12/19] slub: Dynamically size kmalloc cache allocations Christoph Lameter
2010-07-09 19:07 ` [S+Q2 13/19] slub: Extract hooks for memory checkers from hotpaths Christoph Lameter
2010-07-09 19:07 ` [S+Q2 14/19] slub: Move gfpflag masking out of the hotpath Christoph Lameter
2010-07-09 19:07 ` [S+Q2 15/19] SLUB: Add SLAB style per cpu queueing Christoph Lameter
2010-07-09 19:07 ` [S+Q2 16/19] slub: Resize the new cpu queues Christoph Lameter
2010-07-09 19:07 ` [S+Q2 17/19] SLUB: Get rid of useless function count_free() Christoph Lameter
2010-07-09 19:07 ` [S+Q2 18/19] SLUB: Remove MAX_OBJS limitation Christoph Lameter
2010-07-09 19:07 ` [S+Q2 19/19] slub: Drop allocator announcement Christoph Lameter
2010-07-10 19:56 ` [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR Heinz Diehl
2010-07-12 15:11 ` Christoph Lameter
2010-07-12 16:39 ` Heinz Diehl
2010-07-12 17:00 ` Christoph Lameter
2010-07-13 13:56 ` Heinz Diehl
2010-07-14 2:01 ` Christoph Lameter
2010-07-14 11:51 ` Tejun Heo [this message]
2010-07-14 14:25 ` Heinz Diehl
2010-07-14 20:22 ` David Rientjes
2010-07-14 11:46 ` Tejun Heo
2010-07-14 22:26 ` David Rientjes
2010-07-15 20:17 ` Christoph Lameter
2010-07-15 20:30 ` David Rientjes
2010-07-14 23:52 ` David Rientjes
2010-07-16 8:23 ` Pekka Enberg
2010-07-16 9:02 ` David Rientjes
2010-07-19 0:16 ` Benjamin Herrenschmidt
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