From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Bart Van Assche <bart.vanassche@gmail.com>,
Roland Dreier <rdreier@cisco.com>, Ingo Molnar <mingo@elte.hu>,
Matthew Wilcox <matthew@wil.cx>, Ingo Oeser <ioe-lkml@rameria.de>,
Daniel Walker <dwalker@mvista.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Replace completions with semaphores
Date: Tue, 15 Apr 2008 10:26:21 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.1.00.0804151023350.2879@woody.linux-foundation.org> (raw)
In-Reply-To: <4804E29F.9060703@firstfloor.org>
On Tue, 15 Apr 2008, Andi Kleen wrote:
>
> For normal locks. But if you have N number of outstanding
> events you need to wait for the semaphore is the right primitive.
Right. Except if you were to just use completions instead (which could be
trivially extended to do that).
MUCH more trivial than this complex series.
(You may think that the "Replace completions with semaphores" patch is not
very complicated, but it *is* - it depends very intimately on the big
patch-series that basically turns semaphores into what completions are
now!)
In other words, what makes me not like this is hat we first turn
semaphores into the generic code (which is largely what completions were:
just a special case of the generic semaphores!) and then turns completions
into these things. That just doesn't make any sense to me!
Linus
next prev parent reply other threads:[~2008-04-15 17:31 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-11 21:00 Matthew Wilcox
2008-04-12 6:43 ` Daniel Walker
2008-04-12 10:31 ` Ingo Oeser
2008-04-12 12:24 ` Peter Zijlstra
2008-04-12 17:26 ` Matthew Wilcox
2008-04-12 18:01 ` Daniel Walker
2008-04-12 18:05 ` Peter Zijlstra
2008-04-12 19:04 ` Matthew Wilcox
2008-04-12 19:16 ` Peter Zijlstra
2008-04-12 19:53 ` Roland Dreier
2008-04-12 20:47 ` Matthew Wilcox
2008-04-13 7:08 ` Ingo Molnar
2008-04-13 12:57 ` Matthew Wilcox
2008-04-14 15:39 ` Ingo Molnar
2008-04-14 15:58 ` Roland Dreier
2008-04-14 16:32 ` Peter Zijlstra
2008-04-14 16:56 ` Arjan van de Ven
2008-04-14 17:50 ` Matthew Wilcox
2008-04-14 17:46 ` Andi Kleen
2008-04-14 17:54 ` Peter Zijlstra
2008-04-14 18:09 ` Daniel Walker
2008-04-14 19:16 ` Andi Kleen
2008-04-15 6:18 ` Bart Van Assche
2008-04-15 6:46 ` Peter Zijlstra
2008-04-15 7:17 ` Bart Van Assche
2008-04-15 8:44 ` Peter Zijlstra
2008-04-15 13:15 ` Bart Van Assche
2008-04-15 16:09 ` Linus Torvalds
2008-04-15 16:27 ` Andi Kleen
2008-04-15 16:57 ` Linus Torvalds
2008-04-15 17:05 ` Ingo Molnar
2008-04-15 18:50 ` Matthew Wilcox
2008-04-16 12:37 ` Ingo Molnar
2008-04-16 12:50 ` Andi Kleen
2008-04-16 12:59 ` Killable stat/readdir Matthew Wilcox
2008-04-15 17:15 ` [PATCH] Replace completions with semaphores Andi Kleen
2008-04-15 17:26 ` Linus Torvalds [this message]
2008-04-15 17:41 ` Matthew Wilcox
2008-04-15 18:14 ` Linus Torvalds
2008-04-16 16:07 ` Ingo Oeser
2008-04-16 16:16 ` Matthew Wilcox
2008-04-16 16:31 ` Oliver Neukum
2008-04-16 16:34 ` Matthew Wilcox
2008-04-16 16:42 ` Oliver Neukum
2008-04-16 16:44 ` Matthew Wilcox
2008-04-16 16:47 ` Roland Dreier
2008-04-16 16:50 ` Arjan van de Ven
2008-04-16 16:58 ` Matthew Wilcox
2008-04-16 17:08 ` Arjan van de Ven
2008-04-16 17:12 ` Matthew Wilcox
2008-04-16 18:10 ` Matthew Wilcox
2008-04-14 19:16 ` Alan Cox
2008-04-13 14:55 ` Bart Van Assche
2008-04-14 17:12 ` API documentation (was [PATCH] Replace completions with semaphores) Jonathan Corbet
2008-04-14 17:33 ` Peter Zijlstra
2008-04-14 18:38 ` Bart Van Assche
2008-04-13 13:55 ` [PATCH] Replace completions with semaphores Bart Van Assche
2008-04-13 14:22 ` Matthew Wilcox
2008-04-13 7:05 ` Ingo Molnar
2008-04-13 12:52 ` Matthew Wilcox
2008-04-14 15:41 ` Ingo Molnar
2008-04-14 17:46 ` Matthew Wilcox
2008-04-14 16:54 ` Jens Axboe
[not found] <ahyFC-2bu-25@gated-at.bofh.it>
[not found] ` <ahUPJ-8rN-1@gated-at.bofh.it>
[not found] ` <ai4vO-2Rp-19@gated-at.bofh.it>
[not found] ` <ai9Yw-5uh-7@gated-at.bofh.it>
[not found] ` <aiz6z-OZ-31@gated-at.bofh.it>
[not found] ` <aizgp-151-25@gated-at.bofh.it>
[not found] ` <aizSW-2Ar-17@gated-at.bofh.it>
[not found] ` <aiAYF-5e7-19@gated-at.bofh.it>
[not found] ` <aiB8o-5A7-17@gated-at.bofh.it>
[not found] ` <aiCnR-7k-39@gated-at.bofh.it>
[not found] ` <aiMGu-7f0-7@gated-at.bofh.it>
2008-04-16 10:22 ` Bodo Eggert
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