From: Ulrich Drepper <drepper@redhat.com>
To: Pierre Peiffer <pierre.peiffer@bull.net>
Cc: "Ingo Molnar" <mingo@elte.hu>,
LKML <linux-kernel@vger.kernel.org>,
"Dinakar Guniguntala" <dino@in.ibm.com>,
"Jean-Pierre Dion" <jean-pierre.dion@bull.net>,
"Sébastien Dugué" <sebastien.dugue@bull.net>,
"Darren Hart" <dvhltc@us.ibm.com>
Subject: Re: [PATCH 2.6.19.1-rt15][RFC] - futex_requeue_pi implementation (requeue from futex1 to PI-futex2)
Date: Thu, 04 Jan 2007 00:08:35 -0800 [thread overview]
Message-ID: <459CB603.9010208@redhat.com> (raw)
In-Reply-To: <459CB3E6.9080906@bull.net>
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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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prev parent reply other threads:[~2007-01-04 8:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-03 12:32 [PATCH 2.6.19.1-rt15][RFC] - futex_requeue_pi implementation (requeue from futex1 to PI-futex2) Pierre Peiffer
2007-01-03 12:35 ` Ingo Molnar
2007-01-03 14:35 ` Pierre Peiffer
2007-01-03 15:56 ` Ingo Molnar
2007-01-04 7:59 ` Pierre Peiffer
2007-01-04 8:08 ` Ulrich Drepper [this message]
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