From: "Stephen C. Tweedie" <sct@redhat.com>
To: Andrea Arcangeli <andrea@suse.de>,
"Stephen C. Tweedie" <sct@redhat.com>,
Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@transmeta.com>,
Rik van Riel <riel@conectiva.com.br>,
Roger Larsson <roger.larsson@norran.net>,
MM mailing list <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: [patch] vmfixes-2.4.0-test9-B2 - fixing deadlocks
Date: Mon, 25 Sep 2000 16:51:51 +0100 [thread overview]
Message-ID: <20000925165151.I2615@redhat.com> (raw)
In-Reply-To: <20000925003650.A20748@home.ds9a.nl>; from ahu@ds9a.nl on Mon, Sep 25, 2000 at 12:36:50AM +0200
Hi,
On Mon, Sep 25, 2000 at 12:36:50AM +0200, bert hubert wrote:
> On Mon, Sep 25, 2000 at 12:13:42AM +0200, Andrea Arcangeli wrote:
> > On Sun, Sep 24, 2000 at 10:43:03PM +0100, Stephen C. Tweedie wrote:
> > > any form of serialisation on the quota file). This feels like rather
> > > a lot of new and interesting deadlocks to be introducing so late in
> > > 2.4. :-)
>
> True. But they also appear to be found and solved at an impressive rate.
> These deadlocks are fatal and don't hide in corners, whereas the previous mm
> problems used to be very hard to spot and fix, there not being real
> showstoppers, except for abysmal performance. [1]
Sorry, but in this case you have got a lot more variables than you
seem to think. The obvious lock is the ext2 superblock lock, but
there are side cases with quota and O_SYNC which are much less
commonly triggered. That's not even starting to consider the other
dozens of filesystems in the kernel which have to be audited if we
change the locking requirements for GFP calls.
Cheers,
Stephen
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next prev parent reply other threads:[~2000-09-25 15:51 UTC|newest]
Thread overview: 243+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-24 10:11 __GFP_IO && shrink_[d|i]cache_memory()? Ingo Molnar
2000-09-24 18:11 ` Linus Torvalds
2000-09-24 18:40 ` Ingo Molnar
2000-09-24 18:39 ` Linus Torvalds
2000-09-24 18:46 ` Linus Torvalds
2000-09-24 18:59 ` Ingo Molnar
2000-09-24 19:34 ` [patch] vmfixes-2.4.0-test9-B2 Ingo Molnar
2000-09-24 20:20 ` Rui Sousa
2000-09-24 20:24 ` Andrea Arcangeli
2000-09-24 20:26 ` Ingo Molnar
2000-09-24 21:12 ` Andrea Arcangeli
2000-09-24 21:12 ` Ingo Molnar
2000-09-24 21:43 ` Stephen C. Tweedie
2000-09-24 22:13 ` Andrea Arcangeli
2000-09-24 22:36 ` [patch] vmfixes-2.4.0-test9-B2 - fixing deadlocks bert hubert
2000-09-24 23:41 ` Andrea Arcangeli
2000-09-25 16:24 ` Stephen C. Tweedie
2000-09-25 17:03 ` Andrea Arcangeli
2000-09-25 18:06 ` Stephen C. Tweedie
2000-09-25 19:32 ` Andrea Arcangeli
2000-09-25 19:26 ` Rik van Riel
2000-09-25 22:28 ` Andrea Arcangeli
2000-09-25 22:26 ` Rik van Riel
2000-09-25 22:51 ` Andrea Arcangeli
2000-09-25 22:30 ` Linus Torvalds
2000-09-25 23:03 ` Andrea Arcangeli
2000-09-25 23:18 ` Linus Torvalds
2000-09-26 0:32 ` Andrea Arcangeli
2000-09-25 22:30 ` Juan J. Quintela
2000-09-25 23:00 ` Andrea Arcangeli
2000-09-25 19:54 ` Stephen C. Tweedie
2000-09-25 22:44 ` Andrea Arcangeli
2000-09-25 22:42 ` Rik van Riel
2000-09-26 6:54 ` Christoph Rohland
2000-09-26 14:05 ` Andrea Arcangeli
2000-09-26 16:20 ` Christoph Rohland
2000-09-26 17:10 ` Andrea Arcangeli
2000-09-27 8:11 ` Christoph Rohland
2000-09-27 8:28 ` Ingo Molnar
2000-09-27 9:24 ` Christoph Rohland
2000-09-27 13:56 ` Andrea Arcangeli
2000-09-27 16:56 ` Christoph Rohland
2000-09-27 17:42 ` Andrea Arcangeli
2000-09-27 18:25 ` Erik Andersen
2000-09-27 18:55 ` Andrea Arcangeli
2000-09-28 10:08 ` Rik van Riel
2000-09-28 11:16 ` Rik van Riel
2000-09-28 14:52 ` Andrea Arcangeli
2000-09-29 14:39 ` Rik van Riel
2000-09-29 14:55 ` Andrea Arcangeli
2000-09-29 15:40 ` Rik van Riel
2000-09-28 11:31 ` Ingo Molnar
2000-09-28 14:54 ` Andrea Arcangeli
2000-09-28 15:13 ` Ingo Molnar
2000-09-28 15:23 ` Andrea Arcangeli
2000-09-28 16:16 ` Juan J. Quintela
2000-09-28 14:31 ` Andrea Arcangeli
2000-09-25 17:21 ` bert hubert
2000-09-25 17:49 ` Andrea Arcangeli
2000-09-25 15:09 ` Miles Lane
2000-09-25 15:51 ` Stephen C. Tweedie [this message]
2000-09-25 16:05 ` Ingo Molnar
2000-09-25 16:06 ` Alexander Viro
2000-09-25 16:20 ` Ingo Molnar
2000-09-25 16:29 ` Andrea Arcangeli
2000-09-25 4:56 ` [patch] vmfixes-2.4.0-test9-B2 Linus Torvalds
2000-09-25 5:19 ` Alexander Viro
2000-09-25 6:06 ` Linus Torvalds
2000-09-25 6:17 ` Alexander Viro
2000-09-25 21:21 ` Alexander Viro
2000-09-26 13:42 ` [CFT][PATCH] ext2 directories in pagecache Alexander Viro
2000-09-26 21:29 ` Alexander Viro
2000-09-26 22:16 ` Marko Kreen
2000-09-26 22:31 ` Alexander Viro
2000-09-26 22:47 ` Marko Kreen
2000-09-27 7:32 ` Ingo Molnar
2000-09-27 9:22 ` Alexander Viro
2000-09-26 23:19 ` Andreas Dilger
2000-09-26 23:33 ` Alexander Viro
2000-09-26 23:44 ` Alexander Viro
2000-09-25 0:09 ` [patch] vmfixes-2.4.0-test9-B2 Linus Torvalds
2000-09-25 0:49 ` Alexander Viro
2000-09-25 0:53 ` Marcelo Tosatti
2000-09-25 1:45 ` Andrea Arcangeli
2000-09-25 2:39 ` Marcelo Tosatti
2000-09-25 15:36 ` Andrea Arcangeli
2000-09-25 10:42 ` the new VM Ingo Molnar
2000-09-25 13:02 ` Andrea Arcangeli
2000-09-25 13:02 ` Ingo Molnar
2000-09-25 13:08 ` Andrea Arcangeli
2000-09-25 13:12 ` Ingo Molnar
2000-09-25 13:30 ` Andrea Arcangeli
2000-09-25 13:39 ` Ingo Molnar
2000-09-25 14:04 ` Andrea Arcangeli
2000-09-25 14:04 ` Ingo Molnar
2000-09-25 14:23 ` Andrea Arcangeli
2000-09-25 14:27 ` Ingo Molnar
2000-09-25 14:39 ` Andrea Arcangeli
2000-09-25 14:43 ` Ingo Molnar
2000-09-25 15:01 ` Andrea Arcangeli
2000-09-25 15:10 ` Ingo Molnar
2000-09-25 15:24 ` Andrea Arcangeli
2000-09-25 15:26 ` Ingo Molnar
2000-09-25 15:22 ` yodaiken
2000-09-26 19:10 ` Pavel Machek
2000-09-26 20:16 ` Andrea Arcangeli
2000-09-27 7:42 ` Ingo Molnar
2000-09-27 12:11 ` yodaiken
2000-09-27 14:08 ` Andrea Arcangeli
2000-09-25 16:09 ` Rik van Riel
2000-09-25 14:26 ` Marcelo Tosatti
2000-09-25 14:50 ` Andrea Arcangeli
2000-09-25 14:47 ` Alan Cox
2000-09-25 15:16 ` Ingo Molnar
2000-09-25 15:16 ` the new VMt Alan Cox
2000-09-25 15:33 ` the new VM Ingo Molnar
2000-09-25 15:41 ` the new VMt Andrea Arcangeli
2000-09-25 16:02 ` Ingo Molnar
2000-09-25 16:04 ` Andi Kleen
2000-09-25 16:19 ` Ingo Molnar
2000-09-25 16:18 ` Andi Kleen
2000-09-25 16:41 ` Andrea Arcangeli
2000-09-25 16:35 ` Linus Torvalds
2000-09-25 16:41 ` Rik van Riel
2000-09-25 16:49 ` Linus Torvalds
2000-09-25 17:03 ` Ingo Molnar
2000-09-25 17:17 ` Andrea Arcangeli
2000-09-25 17:10 ` Rik van Riel
2000-09-25 17:27 ` Andrea Arcangeli
2000-09-25 17:15 ` Andrea Arcangeli
2000-09-27 7:14 ` Rusty Russell
2000-09-25 20:23 ` Russell King
2000-09-25 16:28 ` Rik van Riel
2000-09-25 16:11 ` Andrea Arcangeli
2000-09-25 16:22 ` Ingo Molnar
2000-09-25 16:17 ` Alexander Viro
2000-09-25 16:36 ` Jeff Garzik
2000-09-25 16:57 ` Alan Cox
2000-09-25 17:01 ` Alexander Viro
2000-09-25 17:06 ` Alan Cox
2000-09-25 17:31 ` Oliver Xymoron
2000-09-25 17:51 ` Jeff Garzik
2000-09-25 19:03 ` the new VMt [4MB+ blocks] Matti Aarnio
2000-09-25 20:02 ` Stephen Williams
2000-09-25 16:33 ` the new VMt Andrea Arcangeli
2000-09-26 8:38 ` Jes Sorensen
2000-09-26 8:52 ` Ingo Molnar
2000-09-26 9:02 ` Jes Sorensen
2000-09-25 16:53 ` Alan Cox
2000-09-25 15:42 ` Stephen C. Tweedie
2000-09-25 16:05 ` Andrea Arcangeli
2000-09-25 16:22 ` Rik van Riel
2000-09-25 16:42 ` Andrea Arcangeli
2000-09-25 17:39 ` Stephen C. Tweedie
2000-09-25 16:51 ` Alan Cox
2000-09-25 17:43 ` Stephen C. Tweedie
2000-09-25 18:13 ` Alan Cox
2000-09-25 18:21 ` Stephen C. Tweedie
2000-09-25 19:09 ` Alan Cox
2000-09-25 19:21 ` Stephen C. Tweedie
2000-09-25 16:52 ` yodaiken
2000-09-25 17:18 ` Jamie Lokier
2000-09-25 17:51 ` yodaiken
2000-09-25 18:04 ` Jamie Lokier
2000-09-25 18:13 ` yodaiken
2000-09-25 18:24 ` Stephen C. Tweedie
2000-09-25 18:34 ` yodaiken
2000-09-25 18:48 ` Jamie Lokier
2000-09-25 19:25 ` Stephen C. Tweedie
2000-09-25 20:04 ` yodaiken
2000-09-25 20:23 ` Alan Cox
2000-09-25 20:35 ` yodaiken
2000-09-25 20:46 ` Alan Cox
2000-09-25 21:07 ` yodaiken
2000-09-26 9:54 ` Stephen C. Tweedie
2000-09-26 13:17 ` yodaiken
2000-09-25 20:47 ` Benjamin C.R. LaHaise
2000-09-25 21:12 ` yodaiken
2000-09-26 10:07 ` Stephen C. Tweedie
2000-09-26 13:30 ` yodaiken
2000-09-25 20:32 ` Stephen C. Tweedie
2000-09-26 12:10 ` Mark Hemment
2000-09-27 10:13 ` Andrey Savochkin
2000-09-27 12:55 ` Hugh Dickins
2000-09-28 3:25 ` Andrey Savochkin
2000-09-25 23:14 ` Erik Andersen
2000-09-26 15:17 ` yodaiken
2000-09-26 16:04 ` Stephen C. Tweedie
2000-09-26 17:02 ` Erik Andersen
2000-09-26 17:08 ` Stephen C. Tweedie
2000-09-26 17:45 ` Erik Andersen
2000-09-27 10:20 ` Andrey Savochkin
2000-09-26 21:13 ` Eric Lowe
2000-09-25 18:20 ` Andrea Arcangeli
2000-09-25 16:16 ` Rik van Riel
2000-09-25 16:55 ` Alan Cox
2000-09-25 15:48 ` the new VM Andrea Arcangeli
2000-09-25 15:40 ` Stephen C. Tweedie
2000-09-25 16:01 ` Andrea Arcangeli
2000-09-25 14:37 ` Rik van Riel
2000-09-25 20:34 ` Christoph Rohland
2000-10-06 16:14 ` Rik van Riel
2000-10-09 7:37 ` Christoph Rohland
2000-09-25 13:04 ` Ingo Molnar
2000-09-25 13:19 ` Andrea Arcangeli
2000-09-25 13:18 ` Ingo Molnar
2000-09-25 13:21 ` Ingo Molnar
2000-09-25 13:31 ` Andrea Arcangeli
2000-09-25 13:47 ` Ingo Molnar
2000-09-25 14:04 ` Andrea Arcangeli
2000-09-25 1:31 ` [patch] vmfixes-2.4.0-test9-B2 Andrea Arcangeli
2000-09-25 1:27 ` Alexander Viro
2000-09-25 2:02 ` Andrea Arcangeli
2000-09-25 2:01 ` Alexander Viro
2000-09-25 13:47 ` Stephen C. Tweedie
2000-09-25 10:13 ` Ingo Molnar
2000-09-25 12:58 ` Andrea Arcangeli
2000-09-25 13:10 ` Ingo Molnar
2000-09-25 13:49 ` Jens Axboe
2000-09-25 14:11 ` Ingo Molnar
2000-09-25 14:05 ` Jens Axboe
2000-09-25 16:46 ` Linus Torvalds
2000-09-25 17:05 ` Ingo Molnar
2000-09-25 17:23 ` Andrea Arcangeli
2000-09-25 14:20 ` Andrea Arcangeli
2000-09-25 14:11 ` Jens Axboe
2000-09-25 14:33 ` Andrea Arcangeli
2000-09-25 13:56 ` Andrea Arcangeli
2000-09-25 13:57 ` Ingo Molnar
2000-09-25 14:13 ` Andrea Arcangeli
2000-09-25 14:08 ` Jens Axboe
2000-09-25 14:29 ` Andrea Arcangeli
2000-09-25 14:18 ` Jens Axboe
2000-09-25 14:47 ` Andrea Arcangeli
2000-09-25 21:28 ` Jens Axboe
2000-09-25 22:14 ` Andrea Arcangeli
2000-09-25 14:13 ` Ingo Molnar
2000-09-25 14:29 ` Ingo Molnar
2000-09-25 14:46 ` Andrea Arcangeli
2000-09-25 14:53 ` Ingo Molnar
2000-09-25 15:02 ` Andrea Arcangeli
2000-09-24 21:38 ` __GFP_IO && shrink_[d|i]cache_memory()? Stephen C. Tweedie
2000-09-24 23:20 ` Alan Cox
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