From: Pavel Machek <pavel@suse.cz>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
mingo@elte.hu, Matthew Kirkwood <matthew@hairy.beasts.org>,
Benjamin LaHaise <bcrl@redhat.com>,
David Axmark <david@mysql.com>,
William Lee Irwin III <wli@holomorphy.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Lightweight userspace semaphores...
Date: Sat, 2 Mar 2002 14:54:53 +0000 [thread overview]
Message-ID: <20020302145452.A37@toy.ucw.cz> (raw)
In-Reply-To: <E16f85L-0005QM-00@wagner.rustcorp.com.au> <Pine.LNX.4.33.0202241543550.28708-100000@home.transmeta.com>
In-Reply-To: <Pine.LNX.4.33.0202241543550.28708-100000@home.transmeta.com>; from torvalds@transmeta.com on Sun, Feb 24, 2002 at 03:48:58PM -0800
Hi!
> > > sys_sem_create()
> > > sys_sem_destroy()
> >
> > There is no create and destroy (init is purely userspace). There is
> > "this is a semapore: up it". This is a feature.
>
> No, that's a bug.
>
> You have to realize that there are architectures that need special
> initialization and page allocation for semaphores: they need special flags
> in the TLB for "careful access", for example (sometimes the careful access
> ends up being non-cached).
Your user part is arch-dependend, anyway. So it can just mmap(..., O_CAREFULL).
Pavel
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
next prev parent reply other threads:[~2002-03-03 20:14 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-23 3:47 Rusty Russell
2002-02-23 15:03 ` Ingo Molnar
2002-02-23 18:20 ` Linus Torvalds
2002-02-23 18:28 ` Larry McVoy
2002-02-23 20:31 ` Ingo Molnar
2002-02-23 21:22 ` Alan Cox
2002-02-26 16:09 ` Hubertus Franke
2002-02-24 23:29 ` Rusty Russell
2002-02-24 23:48 ` Linus Torvalds
2002-02-25 1:10 ` Rusty Russell
2002-02-25 1:23 ` Linus Torvalds
2002-02-25 13:14 ` Alan Cox
2002-02-25 16:11 ` Linus Torvalds
2002-02-25 16:39 ` Alan Cox
2002-02-25 16:32 ` Benjamin LaHaise
2002-02-25 17:42 ` Alan Cox
2002-02-25 18:23 ` Hubertus Franke
2002-02-25 20:57 ` Hubertus Franke
2002-02-25 17:06 ` Linus Torvalds
2002-02-25 17:31 ` Alan Cox
2002-02-25 17:20 ` Linus Torvalds
2002-02-25 17:50 ` Alan Cox
2002-02-25 17:44 ` Linus Torvalds
2002-02-25 18:06 ` Alan Cox
2002-02-25 19:31 ` Linus Torvalds
2002-02-24 4:57 ` Daniel Phillips
2002-02-25 19:51 ` Hubertus Franke
2002-02-26 12:15 ` [PATCH] 2.5.5 IDE clean 14 Martin Dalecki
2002-02-26 21:49 ` Keith Owens
2002-02-27 10:08 ` Martin Dalecki
2002-03-03 7:07 ` [PATCH] Lightweight userspace semaphores Rusty Russell
2002-03-01 4:56 ` Eric W. Biederman
2002-03-02 14:54 ` Pavel Machek [this message]
2002-02-25 15:00 ` Hubertus Franke
2002-03-01 4:44 ` Eric W. Biederman
2002-02-27 0:24 ` Rusty Russell
2002-02-27 15:53 ` Hubertus Franke
2002-03-01 0:24 ` Richard Henderson
2002-03-01 2:00 ` Hubertus Franke
2002-02-27 16:29 ` Hubertus Franke
2002-03-02 14:50 ` Hubertus Franke
2002-03-03 13:30 ` Rusty Russell
2002-03-04 16:51 ` Hubertus Franke
2002-03-05 4:41 ` Rusty Russell
2002-02-27 8:43 [PATCH] Lightweight userspace semphores Martin Wirth
2002-02-27 15:24 ` Hubertus Franke
2002-02-27 17:17 ` Martin Wirth
2002-02-27 19:04 ` Hubertus Franke
[not found] ` <3C7FDF76.9040903@dlr.de>
2002-03-02 14:08 ` [PATCH] Lightweight userspace semaphores Hubertus Franke
[not found] <20020227163834.GF322@reload.nmd.msu.ru>
2002-02-27 16:58 ` Hubertus Franke
[not found] ` <20020227173307.GH322@reload.nmd.msu.ru>
2002-02-27 22:09 ` Hubertus Franke
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