From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Christoph Lameter <clameter@sgi.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
mingo@redhat.com
Subject: Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
Date: Mon, 20 Aug 2007 17:29:22 -0400 [thread overview]
Message-ID: <20070820212922.GA27011@Krystal> (raw)
In-Reply-To: <Pine.LNX.4.64.0708201346160.30353@schroedinger.engr.sgi.com>
* Christoph Lameter (clameter@sgi.com) wrote:
> On Mon, 20 Aug 2007, Mathieu Desnoyers wrote:
>
> > Yes, I use it as synchronization mechanism for my buffer management algorithm
> > in LTTng. Since I write in per-cpu buffers and want to be as reentrant
> > as possible wrt other contexts (dealing with NMI as worse case, but also
> > applies to MCE..), I use local_cmpxchg to reserve space in my buffers.
> > It is faster than the standard cmpxchg.
>
> Ok I have seen these numbers in the OLS papers but I could not reproduce
> them in SLUB.
>
I'm digging in the slub with cmpxchg_local patch... first detail:
slab_alloc seems to have a return path that does not reenable
preemption... I'll keep you posted when I finish the 2.6.23-rc2-mm2
port.
Mathieu
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2007-08-20 21:29 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-20 20:15 [patch 00/23] cmpxchg_local and cmpxchg64_local implementation Mathieu Desnoyers
2007-08-20 20:15 ` [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486 Mathieu Desnoyers
2007-08-20 20:32 ` Christoph Lameter
2007-08-20 20:41 ` Mathieu Desnoyers
2007-08-20 20:46 ` Christoph Lameter
2007-08-20 21:29 ` Mathieu Desnoyers [this message]
2007-08-20 21:49 ` Christoph Lameter
2007-08-20 21:54 ` Mathieu Desnoyers
2007-08-20 22:07 ` Christoph Lameter
2007-08-20 22:29 ` Mathieu Desnoyers
2007-08-21 17:38 ` [PATCH] SLUB Use cmpxchg() everywhere Mathieu Desnoyers
2007-08-21 17:38 ` [PATCH] SLUB use cmpxchg_local Mathieu Desnoyers
2007-08-21 17:44 ` Mathieu Desnoyers
2007-08-21 21:10 ` Christoph Lameter
2007-08-21 23:21 ` Mathieu Desnoyers
2007-08-21 23:35 ` Christoph Lameter
2007-08-21 23:38 ` Christoph Lameter
2007-08-21 20:41 ` Mathieu Desnoyers
2007-08-21 21:36 ` Christoph Lameter
2007-08-21 21:08 ` Christoph Lameter
2007-08-21 23:12 ` Mathieu Desnoyers
2007-08-21 23:17 ` Christoph Lameter
2007-08-21 23:39 ` Mathieu Desnoyers
2007-08-21 23:41 ` Christoph Lameter
2007-08-21 23:47 ` Mathieu Desnoyers
2007-08-21 23:51 ` Christoph Lameter
2007-08-22 0:03 ` Mathieu Desnoyers
2007-08-22 0:11 ` Christoph Lameter
2007-08-22 0:26 ` Mathieu Desnoyers
2007-08-22 0:34 ` Christoph Lameter
2007-08-22 1:18 ` Mathieu Desnoyers
2007-08-22 15:00 ` [PATCH] define have_arch_cmpxchg() Mathieu Desnoyers
2007-08-22 18:50 ` Christoph Lameter
2007-08-22 15:02 ` [PATCH] SLUB: use have_arch_cmpxchg() Mathieu Desnoyers
2007-08-22 16:24 ` Pekka Enberg
2007-08-27 14:56 ` Mathieu Desnoyers
2007-08-27 19:43 ` Christoph Lameter
2007-08-27 20:25 ` Mathieu Desnoyers
2007-08-22 1:28 ` [PATCH] SLUB use cmpxchg_local Andi Kleen
2007-08-22 0:38 ` Mathieu Desnoyers
2007-08-22 1:06 ` Christoph Lameter
2007-08-22 1:12 ` Mathieu Desnoyers
2007-08-22 9:39 ` Andi Kleen
2007-08-22 13:45 ` Mathieu Desnoyers
2007-08-22 13:46 ` Andi Kleen
2007-08-22 18:54 ` Christoph Lameter
2007-08-22 19:25 ` Christoph Lameter
2007-08-22 20:09 ` Mathieu Desnoyers
2007-08-22 20:19 ` Christoph Lameter
2007-08-22 20:29 ` Mathieu Desnoyers
2007-08-22 20:33 ` Christoph Lameter
2007-08-22 20:38 ` Christoph Lameter
2007-08-21 23:14 ` Christoph Lameter
2007-08-21 23:23 ` Mathieu Desnoyers
2007-08-21 23:50 ` Mathieu Desnoyers
2007-08-27 6:52 ` Peter Zijlstra
2007-08-27 19:39 ` Christoph Lameter
2007-08-27 20:22 ` Mathieu Desnoyers
2007-08-27 20:26 ` Christoph Lameter
2007-08-27 20:39 ` Mathieu Desnoyers
2007-08-27 21:04 ` Christoph Lameter
2007-08-27 21:10 ` Mathieu Desnoyers
2007-08-27 21:23 ` Christoph Lameter
2007-08-27 21:38 ` Mathieu Desnoyers
2007-08-27 22:12 ` Christoph Lameter
2007-08-27 22:27 ` Mathieu Desnoyers
2007-08-27 22:29 ` Christoph Lameter
2007-08-28 1:26 ` Christoph Lameter
2007-08-28 1:26 ` Christoph Lameter
2007-08-28 12:07 ` Mathieu Desnoyers
2007-08-28 12:07 ` Mathieu Desnoyers
2007-08-28 19:42 ` Christoph Lameter
2007-08-28 19:42 ` Christoph Lameter
2007-09-04 20:02 ` Mathieu Desnoyers
2007-09-04 20:02 ` Mathieu Desnoyers
2007-09-04 20:03 ` [PATCH] local_t protection (critical section) Mathieu Desnoyers
2007-09-04 20:03 ` Mathieu Desnoyers
2007-09-04 20:04 ` [PATCH] slub - Use local_t protection Mathieu Desnoyers
2007-09-04 20:04 ` Mathieu Desnoyers
2007-09-04 20:45 ` Christoph Lameter
2007-09-04 20:45 ` Christoph Lameter
2007-09-05 13:03 ` Mathieu Desnoyers
2007-09-05 13:03 ` Mathieu Desnoyers
2007-09-05 13:04 ` [PATCH] local_t protection (critical section) Mathieu Desnoyers
2007-09-05 13:04 ` Mathieu Desnoyers
2007-09-12 22:33 ` Christoph Lameter
2007-09-12 22:33 ` Christoph Lameter
2007-09-12 23:00 ` Mathieu Desnoyers
2007-09-12 23:00 ` Mathieu Desnoyers
2007-09-05 13:06 ` [PATCH] slub - Use local_t protection Mathieu Desnoyers
2007-09-05 13:06 ` Mathieu Desnoyers
2007-09-12 22:28 ` Christoph Lameter
2007-09-12 22:28 ` Christoph Lameter
2007-08-27 22:15 ` [PATCH] SLUB use cmpxchg_local Christoph Lameter
2007-08-28 7:12 ` Peter Zijlstra
2007-08-28 19:36 ` Christoph Lameter
2007-08-28 19:46 ` Peter Zijlstra
2007-08-20 20:15 ` [patch 02/23] Add cmpxchg_local to asm-generic for per cpu atomic operations Mathieu Desnoyers
2007-08-20 20:15 ` [patch 03/23] Add cmpxchg_local to arm Mathieu Desnoyers
2007-08-20 20:15 ` [patch 04/23] Add cmpxchg_local to avr32 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 05/23] Add cmpxchg_local to blackfin, replace __cmpxchg by generic cmpxchg Mathieu Desnoyers
2007-08-20 20:15 ` [patch 06/23] Add cmpxchg_local to cris Mathieu Desnoyers
2007-08-20 20:15 ` [patch 07/23] Add cmpxchg_local to frv Mathieu Desnoyers
2007-08-20 20:15 ` [patch 08/23] Add cmpxchg_local to h8300 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 09/23] Add cmpxchg_local, cmpxchg64 and cmpxchg64_local to ia64 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 10/23] New cmpxchg_local (optimized for UP case) for m32r Mathieu Desnoyers
2007-08-21 9:36 ` Hirokazu Takata
2007-08-20 20:15 ` [patch 11/23] Fix m32r __xchg Mathieu Desnoyers
2007-08-21 9:39 ` Hirokazu Takata
2007-08-20 20:15 ` [patch 12/23] local_t m32r use architecture specific cmpxchg_local Mathieu Desnoyers
2007-08-21 9:34 ` Hirokazu Takata
2007-08-21 14:01 ` Mathieu Desnoyers
2007-08-20 20:15 ` [patch 13/23] Add cmpxchg_local to m86k Mathieu Desnoyers
2007-08-20 20:15 ` [patch 14/23] Add cmpxchg_local to m68knommu Mathieu Desnoyers
2007-08-20 20:15 ` [parisc-linux] [patch 15/23] Add cmpxchg_local to parisc Mathieu Desnoyers
2007-08-20 20:15 ` Mathieu Desnoyers
2007-08-20 20:15 ` [patch 16/23] Add cmpxchg_local to ppc Mathieu Desnoyers
2007-08-20 20:15 ` [patch 17/23] Add cmpxchg_local to s390 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 18/23] Add cmpxchg_local to sh, use generic cmpxchg() instead of cmpxchg_u32 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 19/23] Add cmpxchg_local to sh64 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 20/23] Add cmpxchg_local to sparc, move __cmpxchg to system.h Mathieu Desnoyers
2007-08-20 20:15 ` Mathieu Desnoyers
2007-08-20 20:15 ` [patch 21/23] Add cmpxchg_local to sparc64 Mathieu Desnoyers
2007-08-20 20:15 ` Mathieu Desnoyers
2007-08-20 23:34 ` Julian Calaby
2007-08-20 23:34 ` Julian Calaby
2007-08-20 23:36 ` Christoph Lameter
2007-08-20 23:36 ` Christoph Lameter
2007-08-20 23:42 ` Julian Calaby
2007-08-20 23:42 ` Julian Calaby
2007-08-20 23:43 ` [patch 21/23] Add cmpxchg_local to sparc64 (update) Mathieu Desnoyers
2007-08-20 23:43 ` Mathieu Desnoyers
2007-08-20 20:15 ` [patch 22/23] Add cmpxchg_local to v850 Mathieu Desnoyers
2007-08-20 20:15 ` [patch 23/23] Add cmpxchg_local to xtensa Mathieu Desnoyers
2007-08-20 20:29 ` [patch 00/23] cmpxchg_local and cmpxchg64_local implementation Mathieu Desnoyers
-- strict thread matches above, loose matches on Subject: below --
2007-08-12 14:54 [patch 00/23] Atomic operations updates: add cmpxchg_local Mathieu Desnoyers
2007-08-12 14:54 ` [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486 Mathieu Desnoyers
2007-08-12 15:51 ` Jan Engelhardt
2007-08-12 16:23 ` Mathieu Desnoyers
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