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Re: [PATCH] Replace completions with semaphores

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From: Andi Kleen
Subject: Re: [PATCH] Replace completions with semaphores
Date: Wednesday, April 16, 2008 - 5:50 am

> btw., has anyone thought about killable sync/fsync syscalls - would that 

killable stat and readdir would be even more important I would say.

When sync/fsync takes too long it's typically just a kernel bug
of some sort (like that long running MM starvation issue that stalls
writes on some kinds of background activity) that should be really just
fixed.

But handling down network servers which hit stat/readdir etc. is
a real situation not explained by a bug.

For example a standard situation that hits me regularly is that
I save something in firefox on a different server and then later
turn that machine off. Then next time I try to save something
in firefox it first blocks forever in stat()ing that down directory.

-Andi

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Messages in current thread:
[PATCH] Replace completions with semaphores, Matthew Wilcox, (Fri Apr 11, 2:00 pm)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Fri Apr 11, 11:43 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Oeser, (Sat Apr 12, 3:31 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 5:24 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 10:26 am)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Sat Apr 12, 11:01 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 11:05 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 12:04 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Sat Apr 12, 12:16 pm)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Sat Apr 12, 12:53 pm)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sat Apr 12, 1:47 pm)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Sun Apr 13, 12:05 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Sun Apr 13, 12:08 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 5:52 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 5:57 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Sun Apr 13, 6:55 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Sun Apr 13, 7:22 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Sun Apr 13, 7:55 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Mon Apr 14, 8:39 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Mon Apr 14, 8:41 am)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Mon Apr 14, 8:58 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 9:32 am)
Re: [PATCH] Replace completions with semaphores, Jens Axboe, (Mon Apr 14, 9:54 am)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Mon Apr 14, 9:56 am)
Re: API documentation (was [PATCH] Replace completions wit ..., Jonathan Corbet, (Mon Apr 14, 10:12 am)
Re: API documentation (was [PATCH] Replace completions wit ..., Peter Zijlstra, (Mon Apr 14, 10:33 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Mon Apr 14, 10:46 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Mon Apr 14, 10:46 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Mon Apr 14, 10:50 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 10:54 am)
Re: [PATCH] Replace completions with semaphores, Daniel Walker, (Mon Apr 14, 11:09 am)
Re: API documentation (was [PATCH] Replace completions wit ..., Bart Van Assche, (Mon Apr 14, 11:38 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Mon Apr 14, 12:16 pm)
Re: [PATCH] Replace completions with semaphores, Alan Cox, (Mon Apr 14, 12:16 pm)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Mon Apr 14, 11:18 pm)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Mon Apr 14, 11:46 pm)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 12:17 am)
Re: [PATCH] Replace completions with semaphores, Peter Zijlstra, (Tue Apr 15, 1:44 am)
Re: [PATCH] Replace completions with semaphores, Bart Van Assche, (Tue Apr 15, 6:15 am)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 9:09 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Tue Apr 15, 9:27 am)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 9:57 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Tue Apr 15, 10:05 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Tue Apr 15, 10:15 am)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 10:26 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Tue Apr 15, 10:41 am)
Re: [PATCH] Replace completions with semaphores, Linus Torvalds, (Tue Apr 15, 11:14 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Tue Apr 15, 11:50 am)
Re: [PATCH] Replace completions with semaphores, Ingo Molnar, (Wed Apr 16, 5:37 am)
Re: [PATCH] Replace completions with semaphores, Andi Kleen, (Wed Apr 16, 5:50 am)
Killable stat/readdir, Matthew Wilcox, (Wed Apr 16, 5:59 am)
Re: [PATCH] Replace completions with semaphores, Ingo Oeser, (Wed Apr 16, 9:07 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 9:16 am)
Re: [PATCH] Replace completions with semaphores, Oliver Neukum, (Wed Apr 16, 9:31 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 9:34 am)
Re: [PATCH] Replace completions with semaphores, Oliver Neukum, (Wed Apr 16, 9:42 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 9:44 am)
Re: [PATCH] Replace completions with semaphores, Roland Dreier, (Wed Apr 16, 9:47 am)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Wed Apr 16, 9:50 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 9:58 am)
Re: [PATCH] Replace completions with semaphores, Arjan van de Ven, (Wed Apr 16, 10:08 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 10:12 am)
Re: [PATCH] Replace completions with semaphores, Matthew Wilcox, (Wed Apr 16, 11:10 am)