From: Peter Zijlstra <peterz@infradead.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
mingo@redhat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local
Date: Tue, 28 Aug 2007 09:12:39 +0200 [thread overview]
Message-ID: <1188285159.6112.4.camel@twins> (raw)
In-Reply-To: <Pine.LNX.4.64.0708271514020.8891@schroedinger.engr.sgi.com>
On Mon, 2007-08-27 at 15:15 -0700, Christoph Lameter wrote:
> Hmmmm. One wild idea would be to use a priority futex for the slab lock?
> That would make the slow paths interrupt safe without requiring interrupt
> disable? Does a futex fit into the page struct?
Very much puzzled at what you propose. in-kernel we use rt_mutex (has
PI) or mutex, futexes are user-space. (on -rt spinlock_t == mutex ==
rt_mutex)
Neither disable interrupts since they are sleeping locks.
That said, on -rt we do not need to disable interrupts in the allocators
because its a bug to call an allocator from raw irq context.
next prev parent reply other threads:[~2007-08-28 7:13 UTC|newest]
Thread overview: 115+ 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
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 12:07 ` Mathieu Desnoyers
2007-08-28 19:42 ` Christoph Lameter
2007-09-04 20:02 ` Mathieu Desnoyers
2007-09-04 20:03 ` [PATCH] local_t protection (critical section) Mathieu Desnoyers
2007-09-04 20:04 ` [PATCH] slub - Use local_t protection Mathieu Desnoyers
2007-09-04 20:45 ` Christoph Lameter
2007-09-05 13:03 ` Mathieu Desnoyers
2007-09-05 13:04 ` [PATCH] local_t protection (critical section) Mathieu Desnoyers
2007-09-12 22:33 ` Christoph Lameter
2007-09-12 23:00 ` Mathieu Desnoyers
2007-09-05 13:06 ` [PATCH] slub - Use local_t protection Mathieu Desnoyers
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 [this message]
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 ` [patch 15/23] Add cmpxchg_local to parisc 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 ` [patch 21/23] Add cmpxchg_local to sparc64 Mathieu Desnoyers
2007-08-20 23:34 ` Julian Calaby
2007-08-20 23:36 ` Christoph Lameter
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 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1188285159.6112.4.camel@twins \
--to=peterz@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=clameter@sgi.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@polymtl.ca \
--cc=mingo@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox