From: Phillip Susi <psusi@cfl.rr.com>
To: Matt Mackall <mpm@selenic.com>
Cc: Rene Herman <rene.herman@gmail.com>,
Jeremy Fitzhardinge <jeremy@goop.org>,
Jesper Juhl <jesper.juhl@gmail.com>,
Ray Lee <ray-lk@madrabbit.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
William Lee Irwin III <wli@holomorphy.com>,
David Chinner <dgc@sgi.com>
Subject: Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?
Date: Wed, 18 Jul 2007 13:19:44 -0400 [thread overview]
Message-ID: <469E4BB0.8010203@cfl.rr.com> (raw)
In-Reply-To: <20070714191737.GA11166@waste.org>
Matt Mackall wrote:
>> As far as I'm aware, the actual reason for 4K stacks is that after the
>> system has been up and running for some time getting "1 physically
>> contiguous pages" becomes significantly easier than 2 which wouldn't be
>> arbitrary.
>
> If there are exactly two free pages in the system, the odds of them
> being buddies (ie adjacent AND properly aligned) is quite small. The
> available page pool has to grow quite a bit before the availability of
> order-1 page pairs approaches 100%.
>
> So if we fail to allocate an 8k stack when we could have allocated a
> 4k stack, we're almost certainly failing significantly prematurely.
Why do the two pages have to be physically contiguous? The stack just
needs to be two contiguous pages in virtual memory, but they can map to
any two pages anywhere in physical memory.
next prev parent reply other threads:[~2007-07-18 17:19 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-11 17:16 [PATCH][RFC] 4K stacks default, not a debug thing any more...? Jesper Juhl
2007-07-11 17:54 ` Zan Lynx
2007-07-11 20:05 ` Daniel Phillips
2007-07-11 22:09 ` Neil Brown
2007-07-12 3:15 ` Daniel Phillips
2007-07-12 4:16 ` David Chinner
2007-07-12 4:59 ` Ray Lee
2007-07-12 20:24 ` Jesper Juhl
2007-07-13 0:34 ` Jeremy Fitzhardinge
2007-07-13 2:25 ` Jesper Juhl
2007-07-13 4:14 ` Jeremy Fitzhardinge
2007-07-13 9:19 ` Jan Engelhardt
2007-07-13 13:20 ` Rene Herman
2007-07-14 19:17 ` Matt Mackall
2007-07-14 22:19 ` Rene Herman
2007-07-16 23:38 ` Matt Mackall
2007-07-17 13:46 ` Rene Herman
2007-07-18 17:19 ` Phillip Susi [this message]
2007-07-18 17:32 ` Rene Herman
2007-07-18 17:32 ` Alan Cox
2007-07-18 17:33 ` Phillip Susi
2007-07-14 19:42 ` Matt Mackall
2007-07-12 6:08 ` Jeremy Fitzhardinge
2007-07-12 6:37 ` David Chinner
[not found] <8FO1e-2jW-35@gated-at.bofh.it>
[not found] ` <8FYWD-2eS-7@gated-at.bofh.it>
[not found] ` <8GdsH-8dc-13@gated-at.bofh.it>
[not found] ` <8Ghmx-60z-17@gated-at.bofh.it>
[not found] ` <8Gj55-hJ-5@gated-at.bofh.it>
[not found] ` <8GkNo-2Vb-1@gated-at.bofh.it>
[not found] ` <8GtnN-7TG-23@gated-at.bofh.it>
[not found] ` <8GVjY-PL-25@gated-at.bofh.it>
2007-07-15 17:17 ` Bodo Eggert
2007-07-15 17:35 ` Arjan van de Ven
2007-07-15 18:32 ` Måns Rullgård
2007-07-15 17:46 ` Rene Herman
2007-07-16 13:43 ` Bodo Eggert
2007-07-16 22:28 ` Rene Herman
2007-07-16 22:37 ` Ray Lee
2007-07-16 22:54 ` Alan Cox
2007-07-16 22:53 ` Ray Lee
2007-07-16 23:05 ` Rene Herman
2007-07-16 23:15 ` Ray Lee
2007-07-18 0:14 ` Alan Cox
2007-07-18 6:39 ` Ray Lee
2007-07-17 17:01 ` William Lee Irwin III
2007-07-17 23:39 ` Jesper Juhl
2007-07-18 0:22 ` Rene Herman
2007-07-16 22:54 ` Jesper Juhl
2007-07-16 23:01 ` Rene Herman
2007-07-16 23:42 ` Bodo Eggert
2007-07-16 23:51 ` Jesper Juhl
2007-07-19 19:34 ` Denis Vlasenko
2007-07-19 20:04 ` Bodo Eggert
2007-07-16 22:55 ` Rene Herman
2007-07-16 23:07 ` Matt Mackall
2007-07-16 23:12 ` Rene Herman
2007-07-16 23:27 ` Matt Mackall
2007-07-16 23:32 ` Rene Herman
2007-07-18 2:38 ` Rene Herman
2007-07-18 16:54 ` Matt Mackall
2007-07-18 17:17 ` Rene Herman
2007-07-19 0:15 ` Andrea Arcangeli
2007-07-19 0:39 ` Alan Cox
2007-07-19 1:33 ` Andrea Arcangeli
2007-07-19 1:37 ` Matt Mackall
2007-07-19 1:56 ` Rene Herman
2007-07-19 11:24 ` Andrea Arcangeli
2007-07-19 11:44 ` Alan Cox
2007-07-27 13:02 ` Eric Sandeen
2007-07-27 17:38 ` Alan Cox
2007-07-27 18:31 ` Satyam Sharma
2007-08-01 3:53 ` Eric Sandeen
2007-08-01 8:11 ` Dan Merillat
2007-08-01 10:04 ` Neil Brown
2007-08-10 4:51 ` Dan Merillat
2007-08-10 4:59 ` Neil Brown
2007-08-01 13:33 ` Andrea Arcangeli
2007-08-01 15:44 ` Alan Cox
2007-08-10 1:03 ` Dan Merillat
2007-07-19 9:23 ` Alan Cox
2007-07-19 10:52 ` Andrea Arcangeli
2007-07-27 13:03 ` Eric Sandeen
2007-07-27 17:18 ` Krzysztof Halasa
2007-07-19 0:41 ` Matt Mackall
2007-07-19 0:48 ` Rene Herman
2007-07-19 1:28 ` Matt Mackall
2007-07-16 23:13 ` Ray Lee
2007-07-16 23:22 ` Rene Herman
2007-07-16 23:35 ` Jesper Juhl
2007-07-16 23:40 ` Ray Lee
2007-07-17 0:57 ` Rene Herman
2007-07-17 16:14 ` Shawn Bohrer
2007-07-17 16:52 ` Rene Herman
2007-07-17 17:45 ` Zan Lynx
2007-07-18 0:16 ` Alan Cox
2007-07-16 23:45 ` Bodo Eggert
2007-07-17 0:28 ` Rene Herman
2007-07-17 10:06 ` Bodo Eggert
2007-07-17 14:38 ` Rene Herman
2007-07-17 23:19 ` Bodo Eggert
2007-07-17 23:29 ` Arjan van de Ven
2007-07-19 17:20 ` Bodo Eggert
2007-07-17 23:57 ` Rene Herman
2007-07-19 17:05 ` Bodo Eggert
2007-07-16 23:26 ` utz lehmann
2007-07-16 23:39 ` Måns Rullgård
2007-07-17 1:00 ` Rene Herman
2007-07-17 14:45 ` John Stoffel
2007-07-17 23:46 ` utz lehmann
[not found] <8HfVl-71J-15@gated-at.bofh.it>
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[not found] ` <8HIb2-PD-11@gated-at.bofh.it>
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[not found] ` <8HJA3-2Nq-9@gated-at.bofh.it>
[not found] ` <8HXWo-8t2-17@gated-at.bofh.it>
[not found] ` <8HYzd-PZ-25@gated-at.bofh.it>
[not found] ` <8HZlt-27o-7@gated-at.bofh.it>
2007-07-18 8:37 ` Nick Craig-Wood
[not found] ` <8HHRD-rK-19@gated-at.bofh.it>
[not found] ` <8HI1j-Dn-21@gated-at.bofh.it>
[not found] ` <8HIb2-PD-5@gated-at.bofh.it>
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[not found] ` <8IAkZ-WW-1@gated-at.bofh.it>
2007-07-19 13:37 ` Bodo Eggert
[not found] <8IdHQ-7Pm-25@gated-at.bofh.it>
[not found] ` <8IdHQ-7Pm-27@gated-at.bofh.it>
[not found] ` <8IdHQ-7Pm-29@gated-at.bofh.it>
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[not found] ` <8IdHQ-7Pm-23@gated-at.bofh.it>
2007-07-18 11:09 ` Nick Craig-Wood
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