From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>,
"Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
Rob Fuller <rfuller@nsisoftware.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: broken VM in 2.4.10-pre9
Date: Tue, 25 Sep 2001 00:50:34 +0200 [thread overview]
Message-ID: <20010925005033.A137@bug.ucw.cz> (raw)
In-Reply-To: <m1iteegag6.fsf@frodo.biederman.org> <E15jpRy-0003yt-00@the-village.bc.nu>
In-Reply-To: <E15jpRy-0003yt-00@the-village.bc.nu>; from Alan Cox on Wed, Sep 19, 2001 at 11:04:10PM +0100
Hi!
> > So my suggestion was to look at getting anonymous pages backed by what
> > amounts to a shared memory segment. In that vein. By using an extent
> > based data structure we can get the cost down under the current 8 bits
> > per page that we have for the swap counts, and make allocating swap
> > pages faster. And we want to cluster related swap pages anyway so
> > an extent based system is a natural fit.
>
> Much of this goes away if you get rid of both the swap and anonymous page
> special cases. Back anonymous pages with the "whoops everything I write here
> vanishes mysteriously" file system and swap with a swapfs
What exactly is anonymous memory? I thought it is what you do when you
want to malloc(), but you want to back that up by swap, not /dev/null.
Pavel
--
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
WARNING: multiple messages have this Message-ID (diff)
From: Pavel Machek <pavel@suse.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>,
"Eric W. Biederman" <ebiederm@xmission.com>
Cc: Daniel Phillips <phillips@bonn-fries.net>,
Rob Fuller <rfuller@nsisoftware.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: broken VM in 2.4.10-pre9
Date: Tue, 25 Sep 2001 00:50:34 +0200 [thread overview]
Message-ID: <20010925005033.A137@bug.ucw.cz> (raw)
In-Reply-To: <E15jpRy-0003yt-00@the-village.bc.nu>; from Alan Cox on Wed, Sep 19, 2001 at 11:04:10PM +0100
Hi!
> > So my suggestion was to look at getting anonymous pages backed by what
> > amounts to a shared memory segment. In that vein. By using an extent
> > based data structure we can get the cost down under the current 8 bits
> > per page that we have for the swap counts, and make allocating swap
> > pages faster. And we want to cluster related swap pages anyway so
> > an extent based system is a natural fit.
>
> Much of this goes away if you get rid of both the swap and anonymous page
> special cases. Back anonymous pages with the "whoops everything I write here
> vanishes mysteriously" file system and swap with a swapfs
What exactly is anonymous memory? I thought it is what you do when you
want to malloc(), but you want to back that up by swap, not /dev/null.
Pavel
--
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
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next prev parent reply other threads:[~2001-09-25 19:44 UTC|newest]
Thread overview: 154+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-17 15:40 broken VM in 2.4.10-pre9 Rob Fuller
2001-09-17 15:40 ` Rob Fuller
2001-09-17 16:03 ` Eric W. Biederman
2001-09-17 16:03 ` Eric W. Biederman
2001-09-19 9:45 ` Daniel Phillips
2001-09-19 9:45 ` Daniel Phillips
2001-09-19 19:45 ` Alan Cox
2001-09-19 19:45 ` Alan Cox
2001-09-19 21:03 ` Eric W. Biederman
2001-09-19 21:03 ` Eric W. Biederman
2001-09-19 22:04 ` Alan Cox
2001-09-19 22:04 ` Alan Cox
2001-09-19 22:26 ` Eric W. Biederman
2001-09-19 22:26 ` Eric W. Biederman
2001-09-19 23:05 ` Rik van Riel
2001-09-19 23:05 ` Rik van Riel
2001-09-20 11:28 ` Daniel Phillips
2001-09-20 11:28 ` Daniel Phillips
2001-09-20 12:06 ` Rik van Riel
2001-09-20 12:06 ` Rik van Riel
2001-09-21 8:13 ` Daniel Phillips
2001-09-21 8:13 ` Daniel Phillips
2001-09-21 12:10 ` Rik van Riel
2001-09-21 12:10 ` Rik van Riel
2001-09-21 15:27 ` Jan Harkes
2001-09-21 15:27 ` Jan Harkes
2001-09-22 7:09 ` Daniel Phillips
2001-09-22 7:09 ` Daniel Phillips
2001-09-25 11:04 ` Mike Fedyk
2001-09-25 11:04 ` Mike Fedyk
2001-09-20 12:57 ` Alan Cox
2001-09-20 12:57 ` Alan Cox
2001-09-20 13:40 ` Daniel Phillips
2001-09-20 13:40 ` Daniel Phillips
2001-09-24 22:50 ` Pavel Machek [this message]
2001-09-24 22:50 ` Pavel Machek
2001-09-26 18:22 ` Marcelo Tosatti
2001-09-26 18:22 ` Marcelo Tosatti
2001-09-26 23:44 ` Pavel Machek
2001-09-26 23:44 ` Pavel Machek
2001-09-27 13:52 ` Eric W. Biederman
2001-09-27 13:52 ` Eric W. Biederman
2001-10-01 11:37 ` Marcelo Tosatti
2001-10-01 11:37 ` Marcelo Tosatti
2001-09-19 23:00 ` Rik van Riel
2001-09-19 23:00 ` Rik van Riel
2001-09-21 8:23 ` Eric W. Biederman
2001-09-21 8:23 ` Eric W. Biederman
2001-09-21 12:01 ` Rik van Riel
2001-09-21 12:01 ` Rik van Riel
2001-09-22 2:14 ` Alexander Viro
2001-09-22 2:14 ` Alexander Viro
2001-09-22 3:09 ` Rik van Riel
2001-09-22 3:09 ` Rik van Riel
2001-09-21 14:29 ` Gábor Lénárt
2001-09-21 14:35 ` Horst von Brand
2001-09-19 21:37 ` Eric W. Biederman
2001-09-19 21:37 ` Eric W. Biederman
2001-09-19 21:55 ` David S. Miller
2001-09-19 21:55 ` David S. Miller
2001-09-20 13:02 ` Rik van Riel
2001-09-20 13:02 ` Rik van Riel
-- strict thread matches above, loose matches on Subject: below --
2001-09-22 19:59 Peter Magnusson
2001-09-22 20:46 ` Jan Harkes
2001-09-22 21:46 ` Peter Magnusson
2001-09-22 19:59 Peter Magnusson
2001-09-22 20:18 ` Rik van Riel
2001-09-19 22:15 Rob Fuller
2001-09-19 22:15 ` Rob Fuller
2001-09-19 22:21 ` David S. Miller
2001-09-19 22:21 ` David S. Miller
2001-09-19 22:26 ` Christoph Hellwig
2001-09-20 3:16 ` GOTO Masanori
2001-09-20 7:38 ` Christoph Hellwig
2001-09-19 22:30 ` Alan Cox
2001-09-19 22:30 ` Alan Cox
2001-09-19 22:48 ` Eric W. Biederman
2001-09-19 22:48 ` Eric W. Biederman
2001-09-19 22:51 ` Bryan O'Sullivan
2001-09-19 22:51 ` Bryan O'Sullivan
2001-09-16 19:07 vm rewrite ready [Re: broken VM in 2.4.10-pre9] Rik van Riel
2001-09-16 15:19 ` broken VM in 2.4.10-pre9 Phillip Susi
2001-09-16 19:33 ` Jeremy Zawodny
2001-09-16 19:52 ` Rik van Riel
[not found] <fa.i95if5v.74un2p@ifi.uio.no>
[not found] ` <fa.gu977tv.1b7u0g9@ifi.uio.no>
2001-09-16 18:06 ` Dan Maas
2001-09-16 15:19 Ricardo Galli
2001-09-16 15:23 ` Michael Rothwell
2001-09-16 16:33 ` Rik van Riel
2001-09-16 16:50 ` Andreas Steinmetz
2001-09-16 17:12 ` Ricardo Galli
2001-09-16 17:06 ` Ricardo Galli
2001-09-16 17:18 ` Jeremy Zawodny
2001-09-16 18:16 ` Stephan von Krawczynski
2001-09-16 18:45 ` Stephan von Krawczynski
2001-09-21 3:16 ` Bill Davidsen
2001-09-21 10:21 ` Stephan von Krawczynski
2001-09-21 14:08 ` Bill Davidsen
2001-09-21 14:23 ` Rik van Riel
2001-09-23 13:13 ` Eric W. Biederman
2001-09-23 13:27 ` Rik van Riel
2001-09-21 10:43 ` Stephan von Krawczynski
2001-09-21 12:13 ` Rik van Riel
2001-09-21 12:55 ` Stephan von Krawczynski
2001-09-21 13:01 ` Rik van Riel
2001-09-22 11:01 ` Daniel Phillips
2001-09-22 20:05 ` Rik van Riel
2001-09-16 19:43 ` Linus Torvalds
2001-09-16 19:57 ` Rik van Riel
2001-09-16 20:17 ` Rik van Riel
2001-09-16 20:29 ` Andreas Steinmetz
2001-09-16 21:28 ` Linus Torvalds
2001-09-16 22:47 ` Alex Bligh - linux-kernel
2001-09-16 22:55 ` Linus Torvalds
2001-09-16 22:59 ` Stephan von Krawczynski
2001-09-16 22:14 ` Linus Torvalds
2001-09-16 23:29 ` Stephan von Krawczynski
2001-09-17 15:35 ` Stephan von Krawczynski
2001-09-17 15:51 ` Linus Torvalds
2001-09-17 16:34 ` Stephan von Krawczynski
2001-09-17 16:46 ` Linus Torvalds
2001-09-17 17:20 ` Stephan von Krawczynski
2001-09-17 17:37 ` Linus Torvalds
2001-09-17 0:37 ` Daniel Phillips
2001-09-17 1:07 ` Linus Torvalds
2001-09-17 2:23 ` Daniel Phillips
2001-09-17 5:11 ` Jan Harkes
2001-09-17 12:33 ` Daniel Phillips
2001-09-17 12:41 ` Rik van Riel
2001-09-17 14:49 ` Daniel Phillips
2001-09-17 16:14 ` Jan Harkes
2001-09-17 16:34 ` Linus Torvalds
2001-09-17 15:38 ` Linus Torvalds
2001-09-17 12:26 ` Rik van Riel
2001-09-17 15:42 ` Linus Torvalds
2001-09-18 12:04 ` Rik van Riel
2001-09-17 17:33 ` Linus Torvalds
2001-09-17 18:07 ` Linus Torvalds
2001-09-18 12:09 ` Rik van Riel
2001-09-21 3:10 ` Bill Davidsen
2001-09-17 8:06 ` Eric W. Biederman
2001-09-17 8:06 ` Eric W. Biederman
2001-09-17 12:12 ` Rik van Riel
2001-09-17 12:12 ` Rik van Riel
2001-09-17 15:45 ` Eric W. Biederman
2001-09-17 15:45 ` Eric W. Biederman
2001-09-15 22:43 Peter Magnusson
2001-09-15 23:50 ` Jan Harkes
2001-09-16 5:31 ` Linus Torvalds
2001-09-16 8:45 ` Eric W. Biederman
2001-09-17 10:25 ` Tonu Samuel
2001-09-16 16:47 ` Jeremy Zawodny
2001-09-16 18:36 ` Alan Cox
2001-09-16 19:38 ` Linus Torvalds
2001-09-16 19:37 ` Linus Torvalds
2001-09-17 14:04 ` Olaf Zaplinski
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