From: Andrea Arcangeli <andrea@suse.de>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: David Howells <dhowells@redhat.com>,
Linus Torvalds <torvalds@transmeta.com>,
Ulrich.Weigand@de.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: Deadlock on the mm->mmap_sem
Date: Thu, 20 Sep 2001 04:07:02 +0200 [thread overview]
Message-ID: <20010920040702.J720@athlon.random> (raw)
In-Reply-To: <torvalds@transmeta.com> <5079.1000911203@warthog.cambridge.redhat.com> <20010919200357.Z720@athlon.random> <006c01c14137$95c580c0$010411ac@local>
In-Reply-To: <006c01c14137$95c580c0$010411ac@local>; from manfred@colorfullife.com on Wed, Sep 19, 2001 at 08:19:09PM +0200
On Wed, Sep 19, 2001 at 08:19:09PM +0200, Manfred Spraul wrote:
> > 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?
yes, one solution to the latency problem without writing the
ugly code would be simply to add a per-process counter to pass to a
modified rwsem api, then to hide the trickery in a mm_down_read macro.
such way it will be recursive _and_ fair.
Andrea
next prev parent reply other threads:[~2001-09-20 2:07 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
2001-09-20 2:07 ` Andrea Arcangeli [this message]
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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