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Re: [PATCH] Replace completions with semaphores

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To: Linus Torvalds <torvalds@...>
Cc: Andi Kleen <andi@...>, Peter Zijlstra <peterz@...>, Bart Van Assche <bart.vanassche@...>, Roland Dreier <rdreier@...>, Matthew Wilcox <matthew@...>, Ingo Oeser <ioe-lkml@...>, Daniel Walker <dwalker@...>, <linux-kernel@...>
Date: Tuesday, April 15, 2008 - 1:05 pm

* Linus Torvalds <torvalds@linux-foundation.org> wrote:


i very much agree with the "get rid of semaphores" argument - the reason 
why i initially supported the "move to generic semaphores" step was 
because i saw it basically as the precursor to full removal: it is the 
removal of semaphores from all architectures - with a small generic 
compatibility wrapper to handle the remaining few uses of semaphores.

i got thoroughly surprised by the "increase the scope of semaphores" 
angle to the patchset though, and in hindsight i'd rather see neither of 
those generalizations and see semaphores die a slow but sure natural 
death than to see their prolongation :-/

perhaps the 'remove all semaphores from all architectures' privilege 
should be a final step kept for the lucky guy who manages to get rid of 
the last remaining semaphore use in the kernel? :)

	Ingo
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Messages in current thread:
[PATCH] Replace completions with semaphores, Matthew Wilcox, (Fri Apr 11, 5:00 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 8:24 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Sun Apr 13, 3:05 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 8:52 am)
Re: [PATCH] Replace completions with semaphores, Jens Axboe, (Mon Apr 14, 12:54 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Mon Apr 14, 11:41 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Mon Apr 14, 1:46 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 1:26 pm)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Sat Apr 12, 3:53 pm)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Sun Apr 13, 9:55 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 10:22 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 4:47 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Sun Apr 13, 3:08 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Sun Apr 13, 10:55 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 8:57 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Mon Apr 14, 11:39 am)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Mon Apr 14, 11:58 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 12:32 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Mon Apr 14, 1:46 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 1:54 pm)
Re: [PATCH] Replace completions with semaphores, Alan Cox, (Mon Apr 14, 3:16 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Mon Apr 14, 3:16 pm)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 2:18 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Tue Apr 15, 2:46 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 3:17 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Tue Apr 15, 4:44 am)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 12:09 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Tue Apr 15, 12:27 pm)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 12:57 pm)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Tue Apr 15, 1:15 pm)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 1:26 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Tue Apr 15, 1:41 pm)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 2:14 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Oeser, (Wed Apr 16, 12:07 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:16 pm)
Re: [PATCH] Replace completions with semaphores, Oliver Neukum, (Wed Apr 16, 12:31 pm)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Wed Apr 16, 12:50 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:58 pm)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Wed Apr 16, 1:08 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 2:10 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 1:12 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:34 pm)
Re: [PATCH] Replace completions with semaphores, Oliver Neukum, (Wed Apr 16, 12:42 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 12:44 pm)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Wed Apr 16, 12:47 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Tue Apr 15, 1:05 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Tue Apr 15, 2:50 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Wed Apr 16, 8:37 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Wed Apr 16, 8:50 am)
Killable stat/readdir, Matthew Wilcox, (Wed Apr 16, 8:59 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 9:15 am)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Mon Apr 14, 2:09 pm)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Mon Apr 14, 12:56 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Mon Apr 14, 1:50 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 2:05 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 3:04 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 3:16 pm)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Sat Apr 12, 2:01 pm)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Sat Apr 12, 2:43 am)
Re: [PATCH] Replace completions with semaphores, Ingo Oeser, (Sat Apr 12, 6:31 am)
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