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 09:57:07 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.1.00.0804150952300.2879@woody.linux-foundation.org> (raw)
In-Reply-To: <4804D779.6070907@firstfloor.org>
On Tue, 15 Apr 2008, Andi Kleen wrote:
>
> > - probably add support for completions to do counting
>
> But that's just a semaphore, isn't it?
Exactly. But the point here is:
- nobody should use semaphores anyway (use mutexes)
- making *more* code use semaphores is wrong
- completions have a different _mental_ model
IOW, this is not about implementation issues. It's about how you think
about the operations.
We should _not_ implement completions as semaphores, simply because we
want to get *rid* of semaphores some day.
So rather than this long and involved patch series that first makes
semaphores generic, and then makes them be used as completions, I'd much
rather just skip this whole pointless exercise entirely.
Why have "generic semaphores" at all, if we want to get rid of them?
Linus
next prev parent reply other threads:[~2008-04-15 17:00 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 [this message]
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
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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