linux-kernel - Re: [PATCH 2.6.19.1-rt15][RFC] - futex_requeue_pi implementation (requeue from futex1 to PI-futex2)

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Message-ID: <459CB603.9010208@redhat.com>
Date:	Thu, 04 Jan 2007 00:08:35 -0800
From:	Ulrich Drepper <drepper@...hat.com>
To:	Pierre Peiffer <pierre.peiffer@...l.net>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Jean-Pierre Dion <jean-pierre.dion@...l.net>,
	Sébastien Dugué 
	<sebastien.dugue@...l.net>, Darren Hart <dvhltc@...ibm.com>
Subject: Re: [PATCH 2.6.19.1-rt15][RFC] - futex_requeue_pi implementation
 (requeue from futex1 to PI-futex2)

Pierre Peiffer wrote:
> But, just for information, what is the sys_futex64 for, exactly ? Is
> there a plan to have in the future a 64-bit PID ?

This has nothing to do with PIDs.  We need 64-bit values for more
complex bit fields which can then be stored in the futex.  One example
is a new, much faster rwlock implementation.  These are not practical
without 64-bit futexes.  This is why I asked Ingo to add the code.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖


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