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From: torvalds@transmeta.com (Linus Torvalds)
To: linux-kernel@vger.kernel.org
Subject: Re: [patch] 'sticky pages' support in the VM, futex-2.5.38-C5
Date: Thu, 26 Sep 2002 15:01:51 +0000 (UTC)	[thread overview]
Message-ID: <amv7gv$266$1@penguin.transmeta.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0209261311070.11487-100000@localhost.localdomain>

In article <Pine.LNX.4.44.0209261311070.11487-100000@localhost.localdomain>,
Ingo Molnar  <mingo@elte.hu> wrote:
>
>while running fork() testcases with NPTL we found a number of futex
>related failures that i tracked down to the following conceptual bug in
>the futex code:

This patch seems trivially broken by having two futexes on the same
page.  When the first futex removes itself, it will clear the sticky
bit, even though the other futex is still pinning the same page.

Trust me, you'll have to use the page list approach.

		Linus

  reply	other threads:[~2002-09-26 14:53 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-26 11:30 Ingo Molnar
2002-09-26 15:01 ` Linus Torvalds [this message]
2002-09-26 22:09 ` Andrew Morton
2002-09-26 22:32   ` Linus Torvalds
2002-09-27  7:53     ` Ingo Molnar
2002-09-26 22:45   ` Linus Torvalds
2002-09-26 22:56     ` Linus Torvalds
2002-09-27 11:11     ` Ingo Molnar
2002-10-04 22:47 ` Jamie Lokier
2002-10-04 23:20   ` Linus Torvalds
     [not found] <200209261501.g8QF1pc02251@penguin.transmeta.com>
2002-09-26 15:27 ` Ingo Molnar
2002-09-26 16:48   ` Alan Cox
2002-09-27  8:05 Martin Wirth
2002-09-27  9:27 ` Ingo Molnar

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