From: Neil Brown <neilb@suse.de>
To: "Dan Merillat" <dan.merillat@gmail.com>
Cc: "Eric Sandeen" <sandeen@sandeen.net>,
"Satyam Sharma" <satyam.sharma@gmail.com>,
"Alan Cox" <alan@lxorguk.ukuu.org.uk>,
"Andrea Arcangeli" <andrea@suse.de>,
"Matt Mackall" <mpm@selenic.com>,
"Rene Herman" <rene.herman@gmail.com>,
"Ray Lee" <ray-lk@madrabbit.org>, "Bodo Eggert" <7eggert@gmx.de>,
"Jeremy Fitzhardinge" <jeremy@goop.org>,
"Jesper Juhl" <jesper.juhl@gmail.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"William Lee Irwin III" <wli@holomorphy.com>,
"David Chinner" <dgc@sgi.com>,
"Arjan van de Ven" <arjan@infradead.org>
Subject: Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?
Date: Wed, 1 Aug 2007 20:04:03 +1000 [thread overview]
Message-ID: <18096.23187.887075.943181@notabene.brown> (raw)
In-Reply-To: message from Dan Merillat on Wednesday August 1
On Wednesday August 1, dan.merillat@gmail.com wrote:
>
> The other issue is with the layered IO design - no matter what we
> configure the stack size to, it is still possible to create a set of
> translation layers that will cause it to crash regularly: XFS on
> dm_crypt on loop on XFS on dm_crypt on loop on ad infinitum.
No, this does not use indefinite stack.
loop will schedule each request to be handled by a kernel thread, so
requests to 'loop' are serialised, never stacked.
In 2.6.22, generic_make_request detects and serialises recursive calls,
so unlimited recursion is not possible there either.
It is still possible to do
dm on dm on dm on dm on md on md on md on md
and calls to ->issue_flush_fn or ->unplug_fn could use an arbitrarily
large amount of stack. But the stack usage of each stage is very
small so it is unlikely to be a problem (though it should still be
fixed).
NeilBrown
next prev parent reply other threads:[~2007-08-01 10:04 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <8FO1e-2jW-35@gated-at.bofh.it>
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[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 [this message]
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
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[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>
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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>
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[not found] ` <8IdHQ-7Pm-23@gated-at.bofh.it>
2007-07-18 11:09 ` Nick Craig-Wood
2007-07-11 17:16 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
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
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