From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Rene Herman <rene.herman@gmail.com>
Cc: david@lang.hm, Daniel Hazelton <dhazelton@enter.net>,
Mike Galbraith <efault@gmx.de>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Frank Kingswood <frank@kingswood-consulting.co.uk>,
Andi Kleen <andi@firstfloor.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Ray Lee <ray-lk@madrabbit.org>,
Jesper Juhl <jesper.juhl@gmail.com>, ck list <ck@vds.kolivas.org>,
Paul Jackson <pj@sgi.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]
Date: Sat, 28 Jul 2007 12:21:39 +0100 [thread overview]
Message-ID: <20070728122139.3c7f4290@the-village.bc.nu> (raw)
In-Reply-To: <46AB166A.2000300@gmail.com>
> It is. Prefetched pages can be dropped on the floor without additional I/O.
Which is essentially free for most cases. In addition your disk access
may well have been in idle time (and should be for this sort of stuff)
and if it was in the same chunk as something nearby was effectively free
anyway.
Actual physical disk ops are precious resource and anything that mostly
reduces the number will be a win - not to stay swap prefetch is the right
answer but accidentally or otherwise there are good reasons it may happen
to help.
Bigger more linear chunks of writeout/readin is much more important I
suspect than swap prefetching.
> good overview of exactly how broken -mm can be at times. How many -mm users
> use it anyway? He himself said he's not convinced of usefulness having not
I've been using it for months with no noticed problem. I turn it on
because it might as well get tested. I've not done comparison tests so I
can't comment on if its worth it.
Lots of -mm testers turn *everything* on because its a test kernel.
--
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next prev parent reply other threads:[~2007-07-28 11:21 UTC|newest]
Thread overview: 227+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070710013152.ef2cd200.akpm@linux-foundation.org>
2007-07-10 10:15 ` -mm merge plans for 2.6.23 Con Kolivas
2007-07-11 1:02 ` Matthew Hawkins
2007-07-11 1:14 ` [ck] " Andrew Morton
2007-07-11 1:52 ` André Goddard Rosa
2007-07-11 4:25 ` [ck] " André Goddard Rosa
2007-07-11 2:21 ` Ira Snyder
2007-07-11 3:37 ` timotheus
2007-07-11 2:54 ` Matthew Hawkins
2007-07-11 5:18 ` Nick Piggin
2007-07-11 5:47 ` Ray Lee
2007-07-11 5:54 ` Nick Piggin
2007-07-11 6:04 ` Ray Lee
2007-07-11 6:24 ` Nick Piggin
2007-07-11 7:50 ` swap prefetch (Re: -mm merge plans for 2.6.23) Ingo Molnar
2007-07-11 6:00 ` [ck] Re: -mm merge plans for 2.6.23 Nick Piggin
2007-07-11 3:59 ` Grzegorz Kulewski
2007-07-11 12:26 ` Kevin Winchester
2007-07-11 12:36 ` Jesper Juhl
2007-07-12 12:06 ` Kacper Wysocki
2007-07-12 12:35 ` Avuton Olrich
2007-07-22 23:11 ` Con Kolivas
2007-07-23 23:08 ` Jesper Juhl
2007-07-24 3:22 ` Nick Piggin
2007-07-24 4:53 ` Ray Lee
2007-07-24 5:10 ` Jeremy Fitzhardinge
2007-07-24 5:18 ` Ray Lee
2007-07-24 5:16 ` Nick Piggin
2007-07-24 16:11 ` -mm merge plans for 2.6.23 - Completely Fair Swap Prefetch Frank Kingswood
2007-07-25 0:59 ` [ck] " Matthew Hawkins
2007-07-24 16:15 ` -mm merge plans for 2.6.23 Ray Lee
2007-07-25 4:06 ` Nick Piggin
2007-07-25 4:55 ` Rene Herman
2007-07-25 5:00 ` Nick Piggin
2007-07-25 5:12 ` david
2007-07-25 5:30 ` Rene Herman
2007-07-25 5:51 ` david
2007-07-25 7:14 ` Valdis.Kletnieks
2007-07-25 8:18 ` Rene Herman
2007-07-25 8:28 ` Ingo Molnar
2007-07-25 8:43 ` Rene Herman
2007-07-25 10:53 ` [ck] " Jos Poortvliet
2007-07-25 11:06 ` Nick Piggin
2007-07-25 12:39 ` Jos Poortvliet
2007-07-25 13:30 ` Rene Herman
2007-07-25 13:50 ` Ingo Molnar
2007-07-25 17:33 ` Satyam Sharma
2007-07-25 20:35 ` Ingo Molnar
2007-07-26 2:32 ` Bartlomiej Zolnierkiewicz
2007-07-26 4:13 ` Jeff Garzik
2007-07-26 10:22 ` Bartlomiej Zolnierkiewicz
2007-07-25 11:34 ` Ingo Molnar
2007-07-25 11:40 ` Rene Herman
2007-07-25 11:50 ` Ingo Molnar
2007-07-25 16:08 ` Valdis.Kletnieks
2007-07-25 22:05 ` Paul Jackson
2007-07-25 22:22 ` Zan Lynx
2007-07-25 22:27 ` Jesper Juhl
2007-07-25 22:28 ` [ck] " Michael Chang
2007-07-25 23:45 ` André Goddard Rosa
2007-07-25 16:02 ` Ray Lee
2007-07-25 20:55 ` Zan Lynx
2007-07-25 21:28 ` Ray Lee
2007-07-26 1:15 ` [ck] " Matthew Hawkins
2007-07-26 1:32 ` Ray Lee
2007-07-26 3:16 ` Matthew Hawkins
2007-07-26 22:30 ` Michael Chang
2007-07-25 5:30 ` Eric St-Laurent
2007-07-25 5:37 ` Nick Piggin
2007-07-25 5:53 ` david
2007-07-25 6:04 ` Nick Piggin
2007-07-25 6:23 ` david
2007-07-25 7:25 ` Nick Piggin
2007-07-25 7:49 ` Ingo Molnar
2007-07-25 7:58 ` Nick Piggin
2007-07-25 8:15 ` Ingo Molnar
2007-07-25 10:41 ` Jesper Juhl
2007-07-25 6:19 ` [ck] " Matthew Hawkins
2007-07-25 6:30 ` Nick Piggin
2007-07-25 6:47 ` Mike Galbraith
2007-07-25 7:19 ` Eric St-Laurent
2007-07-25 6:44 ` Eric St-Laurent
2007-07-25 16:09 ` Ray Lee
2007-07-26 4:57 ` Andrew Morton
2007-07-26 5:53 ` Nick Piggin
2007-07-26 6:06 ` Andrew Morton
2007-07-26 6:17 ` Nick Piggin
2007-07-26 6:33 ` Ray Lee
2007-07-26 6:50 ` Andrew Morton
2007-07-26 7:43 ` Ray Lee
2007-07-26 7:59 ` Nick Piggin
2007-07-28 0:24 ` Matt Mackall
2007-07-26 14:19 ` [ck] " Michael Chang
2007-07-26 18:13 ` Andrew Morton
2007-07-26 22:04 ` Dirk Schoebel
2007-07-26 22:33 ` Dirk Schoebel
2007-07-26 23:27 ` Jeff Garzik
2007-07-26 23:29 ` david
2007-07-26 23:39 ` Jeff Garzik
2007-07-27 0:12 ` david
2007-07-28 0:12 ` Matt Mackall
2007-07-28 3:42 ` Daniel Cheng
2007-07-28 9:35 ` Stefan Richter
2007-07-25 17:55 ` Frank A. Kingswood
2007-07-25 6:09 ` [ck] " Matthew Hawkins
2007-07-25 6:18 ` Nick Piggin
2007-07-25 16:19 ` Ray Lee
2007-07-25 20:46 ` Andi Kleen
2007-07-26 8:38 ` Frank Kingswood
2007-07-26 9:20 ` Ingo Molnar
2007-07-26 9:34 ` Andrew Morton
2007-07-26 9:40 ` RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23] Ingo Molnar
2007-07-26 10:09 ` Andrew Morton
2007-07-26 10:24 ` Ingo Molnar
2007-07-27 0:33 ` [ck] " Matthew Hawkins
2007-07-30 9:33 ` Helge Hafting
2007-07-26 10:27 ` Ingo Molnar
2007-07-26 10:38 ` Andrew Morton
2007-07-26 12:46 ` Mike Galbraith
2007-07-26 18:05 ` Andrew Morton
2007-07-27 5:12 ` Mike Galbraith
2007-07-27 7:23 ` Mike Galbraith
2007-07-27 8:47 ` Andrew Morton
2007-07-27 8:54 ` Al Viro
2007-07-27 9:02 ` Andrew Morton
2007-07-27 9:40 ` Mike Galbraith
2007-07-27 10:00 ` Andrew Morton
2007-07-27 10:25 ` Mike Galbraith
2007-07-27 17:45 ` Daniel Hazelton
2007-07-27 18:16 ` Rene Herman
2007-07-27 19:43 ` david
2007-07-28 7:19 ` Rene Herman
2007-07-28 8:55 ` david
2007-07-28 10:11 ` Rene Herman
2007-07-28 11:21 ` Alan Cox [this message]
2007-07-28 16:29 ` Ray Lee
2007-07-28 21:03 ` david
2007-07-29 8:11 ` Rene Herman
2007-07-29 13:12 ` Alan Cox
2007-07-29 14:07 ` Rene Herman
2007-07-29 14:58 ` Ray Lee
2007-07-29 14:59 ` Rene Herman
2007-07-29 15:20 ` Ray Lee
2007-07-29 15:36 ` Rene Herman
2007-07-29 16:04 ` Ray Lee
2007-07-29 16:59 ` Rene Herman
2007-07-29 17:19 ` Ray Lee
2007-07-29 17:33 ` Rene Herman
2007-07-29 17:52 ` Ray Lee
2007-07-29 19:05 ` Rene Herman
2007-07-29 17:53 ` Alan Cox
2007-07-29 19:33 ` Paul Jackson
2007-07-29 20:00 ` Ray Lee
2007-07-29 20:18 ` Paul Jackson
2007-07-29 20:23 ` Ray Lee
2007-07-29 21:06 ` Daniel Hazelton
2007-07-28 21:00 ` david
2007-07-29 10:09 ` Rene Herman
2007-07-29 11:41 ` david
2007-07-29 14:01 ` Rene Herman
2007-07-29 21:19 ` david
2007-08-06 2:14 ` Nick Piggin
2007-08-06 2:22 ` david
2007-08-06 9:21 ` Nick Piggin
2007-08-06 9:55 ` Paolo Ciarrocchi
2007-07-28 15:56 ` Daniel Hazelton
2007-07-28 21:06 ` david
2007-07-28 21:48 ` Daniel Hazelton
2007-07-27 20:28 ` Daniel Hazelton
2007-07-28 5:19 ` Rene Herman
2007-07-27 23:15 ` Björn Steinbrink
2007-07-27 23:29 ` Andi Kleen
2007-07-28 0:08 ` Björn Steinbrink
2007-07-28 1:10 ` Daniel Hazelton
2007-07-29 12:53 ` Paul Jackson
2007-07-28 7:35 ` Rene Herman
2007-07-28 8:51 ` Rene Herman
2007-07-27 22:08 ` Mike Galbraith
2007-07-27 22:51 ` Daniel Hazelton
2007-07-28 7:48 ` Mike Galbraith
2007-07-28 15:36 ` Daniel Hazelton
2007-07-29 1:33 ` Rik van Riel
2007-07-29 3:39 ` Andrew Morton
2007-07-26 10:20 ` Al Viro
2007-07-26 12:23 ` Andi Kleen
2007-07-26 14:59 ` Al Viro
2007-07-11 20:41 ` Pavel Machek
2007-07-27 19:19 ` Paul Jackson
2007-07-26 13:05 ` Fredrik Klasson
2007-07-31 16:37 ` [ck] Re: -mm merge plans for 2.6.23 Matthew Hawkins
2007-08-06 2:11 ` Nick Piggin
2007-07-25 4:46 ` david
2007-07-25 8:00 ` Rene Herman
2007-07-25 8:07 ` david
2007-07-25 8:29 ` Rene Herman
2007-07-25 8:31 ` david
2007-07-25 8:33 ` david
2007-07-25 10:58 ` Rene Herman
2007-07-25 15:55 ` Ray Lee
2007-07-25 20:16 ` Al Boldi
2007-07-27 0:28 ` Magnus Naeslund
2007-07-24 5:18 ` Andrew Morton
2007-07-24 6:01 ` Ray Lee
2007-07-24 6:10 ` Andrew Morton
2007-07-24 9:38 ` Tilman Schmidt
2007-07-25 1:26 ` [ck] " Matthew Hawkins
2007-07-25 1:35 ` David Miller, Matthew Hawkins
2007-07-24 0:08 ` Con Kolivas
2007-07-11 11:39 ` buffered write patches, " Christoph Hellwig
2007-07-11 17:23 ` Andrew Morton
2007-07-11 12:23 ` lguest, " Christoph Hellwig
2007-07-11 15:45 ` Randy Dunlap
2007-07-11 18:04 ` Andrew Morton
2007-07-12 1:21 ` Rusty Russell
2007-07-12 2:28 ` David Miller, Rusty Russell
2007-07-12 2:48 ` Rusty Russell
2007-07-12 2:51 ` David Miller, Rusty Russell
2007-07-12 3:15 ` Rusty Russell
2007-07-12 3:35 ` David Miller, Rusty Russell
2007-07-12 4:24 ` Andrew Morton
2007-07-12 4:52 ` Rusty Russell
2007-07-12 11:10 ` Avi Kivity
2007-07-19 17:27 ` Christoph Hellwig
2007-07-20 3:27 ` Rusty Russell
2007-07-20 7:15 ` Christoph Hellwig
2007-07-12 0:54 ` fault vs invalidate race (Re: -mm merge plans for 2.6.23) Nick Piggin
2007-07-12 2:31 ` block_page_mkwrite? (Re: fault vs invalidate race (Re: -mm merge plans for 2.6.23)) David Chinner
2007-07-12 2:42 ` Nick Piggin
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