From: Christoph Lameter <clameter@sgi.com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Eric Dumazet <dada1@cosmosbay.com>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Torsten Kaiser <just.for.lkml@googlemail.com>,
Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.6.25-rc2
Date: Wed, 27 Feb 2008 15:34:07 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0802271532580.14380@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20080219200358.GB11197@Krystal>
On Tue, 19 Feb 2008, Mathieu Desnoyers wrote:
> I think you are right. A way to fix this would use the fact that the
> freelist is only useful to point to the first free object in a page. We
> could change it to an offset rather than an address.
>
> The freelist would become a counter of type "long" which increments
> until it wraps at 2^32 or 2^64. A PAGE_MASK bitmask could then be used
> to get low order bits which would get the page offset of the first free
> object, while the high order bits would insure we can detect this type
> of object reuse when doing a cmpxchg. Upon free, the freelist counter
> should always be incremented; this would be provided by adding PAGE_SIZE
> to the counter and setting the LSBs to the correct offset.
Urgh.... That sounds way too complicated. Do you have an experimental
patch that would allow us to see the impact?
next prev parent reply other threads:[~2008-02-27 23:34 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 21:23 Linus Torvalds
2008-02-16 2:08 ` Rafael J. Wysocki
2008-02-16 5:44 ` [BUG] Linux 2.6.25-rc2 - Kernel Ooops while running dbench Kamalesh Babulal
2008-02-18 12:59 ` Andrew Morton
2008-02-18 14:25 ` Jeff Garzik
2008-02-18 16:11 ` Frans Pop
2008-03-03 11:51 ` Pekka Enberg
2008-03-04 4:03 ` Kamalesh Babulal
2008-02-16 6:10 ` [BUG] Linux 2.6.25-rc2 - Regression from 2.6.24-rc1-git1 softlockup while bootup on powerpc Kamalesh Babulal
2008-02-17 19:29 ` Jens Axboe
2008-02-19 8:04 ` KAMEZAWA Hiroyuki
2008-02-19 8:36 ` Jens Axboe
2008-02-19 8:47 ` KAMEZAWA Hiroyuki
2008-02-19 8:58 ` Jens Axboe
2008-02-19 9:07 ` KAMEZAWA Hiroyuki
2008-02-19 9:09 ` Jens Axboe
2008-02-19 9:02 ` KAMEZAWA Hiroyuki
2008-02-19 9:01 ` Jens Axboe
2008-02-19 13:19 ` Kamalesh Babulal
2008-02-22 7:24 ` Andrew Morton
2008-02-22 7:40 ` Jens Axboe
2008-02-17 20:08 ` Rafael J. Wysocki
2008-02-16 16:52 ` Linux 2.6.25-rc2 Jan Engelhardt
2008-02-16 19:14 ` Linux 2.6.25-rc2 regression: LVM cannot find volume group Tilman Schmidt
2008-02-16 20:12 ` Alan Cox
2008-02-16 22:37 ` Jiri Slaby
2008-02-18 0:57 ` Tilman Schmidt
2008-02-18 1:22 ` Jeff Chua
2008-02-18 10:35 ` Tilman Schmidt
2008-02-19 1:53 ` Alasdair G Kergon
2008-02-19 8:56 ` Tilman Schmidt
2008-02-16 21:38 ` Linux 2.6.25-rc2 Torsten Kaiser
2008-02-17 20:25 ` Rafael J. Wysocki
2008-02-17 21:32 ` Torsten Kaiser
2008-02-18 23:54 ` Linus Torvalds
2008-02-19 6:44 ` Torsten Kaiser
2008-02-19 6:11 ` Ingo Molnar
2008-02-19 6:54 ` Torsten Kaiser
2008-02-19 7:21 ` Pekka Enberg
2008-02-19 10:27 ` Ingo Molnar
2008-02-19 10:45 ` Pekka Enberg
2008-02-19 13:02 ` Mathieu Desnoyers
2008-02-19 14:00 ` Ingo Molnar
2008-02-19 14:02 ` Mathieu Desnoyers
2008-02-19 14:21 ` Pekka Enberg
2008-02-19 14:38 ` Pekka Enberg
2008-02-19 14:55 ` Ingo Molnar
2008-02-19 14:57 ` Ingo Molnar
2008-02-19 15:54 ` Pekka Enberg
2008-02-19 15:52 ` Pekka Enberg
2008-02-20 0:36 ` Zhang, Yanmin
2008-02-20 2:08 ` Zhang, Yanmin
2008-02-20 6:53 ` Zhang, Yanmin
2008-02-20 7:10 ` Pekka Enberg
2008-02-19 16:20 ` Linus Torvalds
2008-02-19 16:45 ` Ingo Molnar
2008-02-19 16:48 ` Ingo Molnar
2008-02-19 19:27 ` Torsten Kaiser
2008-02-19 20:08 ` Mathieu Desnoyers
2008-02-27 23:32 ` Christoph Lameter
2008-02-28 1:57 ` Andrew Morton
2008-02-28 2:43 ` Christoph Lameter
2008-02-28 8:14 ` Ingo Molnar
2008-02-28 11:15 ` Alan Cox
2008-02-28 11:13 ` Jiri Kosina
2008-02-19 16:27 ` Eric Dumazet
2008-02-19 16:38 ` Linus Torvalds
2008-02-19 20:03 ` Mathieu Desnoyers
2008-02-27 23:34 ` Christoph Lameter [this message]
2008-02-28 5:55 ` [PATCH] Implement slub fastpath in terms of freebase and freeoffset Mathieu Desnoyers
2008-02-28 19:08 ` Christoph Lameter
2008-02-28 23:25 ` Mathieu Desnoyers
2008-02-29 0:57 ` Christoph Lameter
2008-02-29 1:56 ` Mathieu Desnoyers
2008-02-29 2:12 ` Christoph Lameter
2008-02-29 3:32 ` Mathieu Desnoyers
2008-02-29 5:11 ` Christoph Lameter
2008-02-29 13:03 ` Mathieu Desnoyers
2008-02-29 19:57 ` Christoph Lameter
2008-02-29 13:28 ` [PATCH] Slub Freeoffset check overflow Mathieu Desnoyers
2008-03-04 6:17 ` [PATCH] Slub Freeoffset check overflow (updated) Mathieu Desnoyers
2008-03-04 7:15 ` Christoph Lameter
2008-02-27 23:32 ` Linux 2.6.25-rc2 Christoph Lameter
2008-02-19 18:39 ` Torsten Kaiser
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