From: "Manfred Spraul" <manfred@colorfullife.com>
To: "Andrea Arcangeli" <andrea@suse.de>,
"David Howells" <dhowells@redhat.com>
Cc: "Linus Torvalds" <torvalds@transmeta.com>,
<Ulrich.Weigand@de.ibm.com>, <linux-kernel@vger.kernel.org>
Subject: Re: Deadlock on the mm->mmap_sem
Date: Wed, 19 Sep 2001 20:19:09 +0200 [thread overview]
Message-ID: <006c01c14137$95c580c0$010411ac@local> (raw)
In-Reply-To: <torvalds@transmeta.com> <5079.1000911203@warthog.cambridge.redhat.com> <20010919200357.Z720@athlon.random>
> if we go generic then I strongly recommend my version of the generic
> semaphores is _much_ faster (and cleaner) than this one (it even
allows
> more than 2^31 concurrent readers on 64 bit archs ;).
>
Andrea,
implementing recursive semaphores is trivial, but do you have any idea
how to fix the latency problem?
Multithreaded, iobound apps that use mmap are unusable with unfair
semaphores.
My test app hangs for minutes within mprotect().
--
Manfred
next prev parent reply other threads:[~2001-09-20 1:59 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-17 21:50 Deadlock on the mm->mmap_sem Manfred Spraul
2001-09-17 23:39 ` Linus Torvalds
[not found] ` <200109172339.f8HNd5W13244@penguin.transmeta.com>
2001-09-18 0:01 ` Andrea Arcangeli
2001-09-18 7:31 ` Manfred Spraul
2001-09-18 7:55 ` Andrea Arcangeli
2001-09-18 8:18 ` David Howells
2001-09-18 9:32 ` David Howells
2001-09-18 9:37 ` Manfred Spraul
2001-09-18 9:49 ` Arjan van de Ven
2001-09-18 12:53 ` Manfred Spraul
2001-09-18 14:13 ` David Howells
2001-09-18 14:49 ` Alan Cox
2001-09-18 15:26 ` David Howells
2001-09-18 15:46 ` Alan Cox
2001-09-18 15:11 ` David Howells
2001-09-18 16:49 ` Linus Torvalds
2001-09-19 9:51 ` David Howells
2001-09-19 12:49 ` Andrea Arcangeli
2001-09-19 14:08 ` Manfred Spraul
2001-09-19 14:51 ` David Howells
2001-09-19 15:18 ` Manfred Spraul
2001-09-19 14:53 ` David Howells
2001-09-19 18:03 ` Andrea Arcangeli
2001-09-19 18:16 ` Benjamin LaHaise
2001-09-19 18:27 ` David Howells
2001-09-19 18:48 ` Andrea Arcangeli
2001-09-19 18:45 ` Andrea Arcangeli
2001-09-19 21:14 ` Benjamin LaHaise
2001-09-19 22:07 ` Andrea Arcangeli
2001-09-19 18:19 ` Manfred Spraul [this message]
2001-09-20 2:07 ` Andrea Arcangeli
2001-09-20 4:37 ` Andrea Arcangeli
2001-09-20 7:05 ` David Howells
2001-09-20 7:19 ` Andrea Arcangeli
2001-09-20 8:01 ` David Howells
2001-09-20 8:09 ` Andrea Arcangeli
2001-09-19 18:26 ` David Howells
2001-09-19 18:47 ` Andrea Arcangeli
2001-09-19 23:25 ` David Howells
2001-09-19 23:34 ` Andrea Arcangeli
2001-09-19 23:46 ` Andrea Arcangeli
2001-09-19 23:24 ` [PATCH] attempt #2 (Re: Deadlock on the mm->mmap_sem) David Howells
2001-09-19 14:58 ` Deadlock on the mm->mmap_sem David Howells
[not found] <masp0008@stud.uni-sb.de>
2001-09-20 10:57 ` Studierende der Universitaet des Saarlandes
2001-09-20 12:40 ` David Howells
2001-09-20 18:24 ` Andrea Arcangeli
2001-09-20 21:43 ` Manfred Spraul
2001-09-22 21:06 ` Manfred Spraul
-- strict thread matches above, loose matches on Subject: below --
2001-09-18 13:22 Ulrich Weigand
2001-09-17 20:57 Ulrich Weigand
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