From: Daniel Walker <dwalker@mvista.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Pierre Peiffer <peifferp@gmail.com>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: futex: priority wakeup miss ordering
Date: Thu, 08 May 2008 09:28:17 -0700 [thread overview]
Message-ID: <1210264097.17132.261.camel@localhost.localdomain> (raw)
In-Reply-To: <alpine.LFD.1.10.0805081156450.3318@apollo.tec.linutronix.de>
On Thu, 2008-05-08 at 12:06 +0200, Thomas Gleixner wrote:
> IIRC this has been discussed before. The priority ordering of the
> plain mutex waiters is an optimization without guarantees of
> correctness across a priority change. It's simply not worth the
> additional complexity and overhead for that corner case.
I've gotten a number of complains about this .. I think it's assumed
that this feature was implementing posix priority queuing for the
standard futex, but it can't be if there are any miss ordered wakeups.
Daniel
prev parent reply other threads:[~2008-05-08 16:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-07 21:22 Daniel Walker
2008-05-08 8:25 ` Andrew Morton
2008-05-08 10:06 ` Thomas Gleixner
2008-05-08 16:28 ` Daniel Walker [this message]
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