From: Ulrich Drepper <drepper@redhat.com>
To: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: light weight user level semaphores
Date: 19 Apr 2001 13:40:19 -0700 [thread overview]
Message-ID: <m31yqo1v4c.fsf@otr.mynet.cygnus.com> (raw)
In-Reply-To: <Pine.LNX.4.31.0104191036220.5052-100000@penguin.transmeta.com> <m3ofts3d4k.fsf@otr.mynet.cygnus.com> <20010419222228.J682@nightmaster.csn.tu-chemnitz.de>
In-Reply-To: Ingo Oeser's message of "Thu, 19 Apr 2001 22:22:28 +0200"
Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de> writes:
> Are you sure, you can implement SMP-safe, atomic operations (which you need
> for all up()/down() in user space) WITHOUT using privileged
> instructions on ALL archs Linux supports?
Which processors have no such instructions but are SMP-capable?
> How do we do this on nccNUMA machines later? How on clusters[1]?
Clusters are not my problem. They require additional software. And
NUMA machines maybe be requiring a certain sequence in which the
operations must be performed and the hardware should take care of the
rest.
I don't really care what the final implementation will be like. For
UP and SMP machines I definitely want to have as much as possible at
user-level. If you need a special libpthread for NUMA machines, so be
it.
--
---------------. ,-. 1325 Chesapeake Terrace
Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA
Red Hat `--' drepper at redhat.com `------------------------
next prev parent reply other threads:[~2001-04-19 20:41 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20010417114433.D1108@w-mikek2.sequent.com>
2001-04-17 19:48 ` Linus Torvalds
2001-04-18 18:13 ` Bernd Eckenfels
2001-04-18 19:35 ` Ulrich Drepper
2001-04-19 8:20 ` Alon Ziv
2001-04-19 8:52 ` Abramo Bagnara
2001-04-19 9:08 ` Alexander Viro
2001-04-19 10:44 ` Abramo Bagnara
2001-04-19 16:11 ` Linus Torvalds
2001-04-19 16:33 ` Alexander Viro
2001-04-19 16:43 ` Linus Torvalds
2001-04-19 17:33 ` Alexander Viro
2001-04-19 17:38 ` Linus Torvalds
2001-04-19 18:24 ` Alexander Viro
2001-04-19 19:26 ` Ulrich Drepper
2001-04-19 19:35 ` Alan Cox
2001-04-19 20:06 ` Ulrich Drepper
2001-04-19 20:11 ` Alan Cox
2001-04-19 20:26 ` Ulrich Drepper
2001-04-19 20:22 ` Ingo Oeser
2001-04-19 20:40 ` Ulrich Drepper [this message]
2001-04-19 20:51 ` Linus Torvalds
2001-04-19 21:38 ` Alan Cox
2001-04-19 20:49 ` Linus Torvalds
2001-04-19 21:18 ` Ulrich Drepper
2001-04-19 21:41 ` Linus Torvalds
2001-04-19 22:46 ` Ulrich Drepper
2001-04-20 1:35 ` Alexander Viro
2001-04-20 2:45 ` Ulrich Drepper
2001-04-19 16:43 ` Abramo Bagnara
2001-04-19 20:47 ` Ingo Oeser
2001-04-19 20:54 ` Linus Torvalds
2001-04-19 9:08 ` Ingo Oeser
2001-04-19 11:51 ` Alan Cox
2001-04-19 16:03 ` Linus Torvalds
2001-04-19 16:38 ` Alan Cox
2001-04-19 16:46 ` Linus Torvalds
2001-04-19 17:12 ` Alan Cox
2001-04-19 22:35 ` Rogier Wolff
2001-04-20 9:29 ` Olaf Titz
2001-04-20 14:19 ` Jesse Pollard
2001-04-20 18:36 ` Olaf Titz
2001-04-20 23:33 ` Linus Torvalds
2001-04-21 4:06 ` fd allocation [was: light weight user level semaphores] Edgar Toernig
2001-04-22 9:48 ` Olaf Titz
2001-04-22 11:41 ` light weight user level semaphores Alon Ziv
2001-04-22 12:44 ` Alan Cox
2001-04-22 15:19 ` Alon Ziv
2001-04-22 14:31 ` Alexander Viro
2001-04-22 16:08 ` Alon Ziv
2001-04-22 11:41 ` Alon Ziv
2001-04-22 14:18 ` David Woodhouse
2001-04-23 13:19 ` David Howells
2001-04-23 14:48 ` Alon Ziv
2001-04-23 15:40 ` David Howells
2001-04-21 10:13 ` Olaf Titz
2001-04-23 15:34 ` Jeff Garzik
2001-04-23 19:18 ` Ingo Oeser
2001-04-24 0:19 ` David Wagner
2001-04-24 0:41 ` Alexander Viro
2001-04-19 19:47 ` Ulrich Drepper
2001-04-19 18:48 ` Olaf Titz
2001-04-19 13:59 George Talbot
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