From: Xavier Bestel <xavier.bestel@free.fr>
To: Helge Hafting <helgehaf@aitel.hist.no>
Cc: Giuliano Pochini <pochini@shiny.it>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] O_STREAMING - flag for optimal streaming I/O
Date: 10 Oct 2002 14:29:11 +0200 [thread overview]
Message-ID: <1034252951.961.23.camel@bip> (raw)
In-Reply-To: <3DA55E0C.24033BB5@aitel.hist.no>
Le jeu 10/10/2002 à 13:01, Helge Hafting a écrit :
> Giuliano Pochini wrote:
>
> > Yes, it makes sense, but it's useless or harmful to discard caches
> > if nobody else needs memory. You just lose data that may be
> > requested in the future for no reason.
>
> Sure, so the ideal is to not drop unconditionally, but
> make sure that the "finished" O_STREAMING pages are
> the very first ones to go whenever memory pressure happens.
IMHO this shoudln't be taken care of. As you say it, a linux box has no
free memory (or it's been very recently booted), so the problem is not
to make O_STREAMING pages "low priority", but just to make them not stay
in the cache (perhaps just keep a few KB worth of them in case of a
limited seek back, but not more).
Xav
next prev parent reply other threads:[~2002-10-10 12:23 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-08 2:38 [PATCH] O_STREAMING - flag for optimal streaming I/O Robert Love
2002-10-08 10:42 ` J.A. Magallon
2002-10-08 18:08 ` Robert Love
2002-10-08 18:38 ` Chris Wedgwood
2002-10-08 18:49 ` Robert Love
2002-10-08 19:05 ` Chris Wedgwood
2002-10-08 19:17 ` Robert Love
2002-10-08 19:30 ` Andrew Morton
2002-10-09 14:14 ` Marco Colombo
2002-10-09 16:30 ` kernel
2002-10-08 19:52 ` Chris Wedgwood
2002-10-08 19:59 ` Robert Love
2002-10-08 20:01 ` Chris Wedgwood
2002-10-09 8:33 ` Giuliano Pochini
2002-10-09 8:43 ` Andrew Morton
2002-10-09 10:55 ` Giuliano Pochini
2002-10-09 17:05 ` Mark Mielke
2002-10-09 19:36 ` Giuliano Pochini
2002-10-09 22:24 ` Mark Mielke
2002-10-09 23:20 ` Jamie Lokier
2002-10-10 3:07 ` Mark Mielke
2002-10-10 10:55 ` Helge Hafting
2002-10-10 17:50 ` Mark Mielke
2002-10-10 3:29 ` Erik Andersen
2002-10-10 3:37 ` Robert Love
2002-10-10 13:39 ` Giuliano Pochini
2002-10-10 22:50 ` Mike Fedyk
2002-10-10 22:58 ` Erik Andersen
2002-10-11 8:26 ` Giuliano Pochini
2002-10-11 8:32 ` Helge Hafting
2002-10-10 8:33 ` Giuliano Pochini
2002-10-10 9:10 ` Erik Andersen
2002-10-10 9:38 ` Giuliano Pochini
2002-10-10 10:40 ` Miquel van Smoorenburg
2002-10-10 11:01 ` Helge Hafting
2002-10-10 12:29 ` Xavier Bestel [this message]
2002-10-10 13:17 ` Giuliano Pochini
2002-10-10 22:44 ` Mike Fedyk
2002-10-11 8:13 ` Giuliano Pochini
2002-10-10 11:38 ` O_STREAMING has insufficient info - how about fadvise() ? Alan Cox
2002-10-10 11:47 ` William Lee Irwin III
2002-10-10 15:34 ` Andrew Morton
2002-10-10 16:08 ` Alan Cox
2002-10-10 16:49 ` Oliver Xymoron
2002-10-10 15:37 ` [PATCH] O_STREAMING - flag for optimal streaming I/O Gerhard Mack
2002-10-10 22:47 ` Mike Fedyk
2002-10-11 2:14 ` Gerhard Mack
2002-10-11 8:10 ` Chris Wedgwood
2002-10-10 9:14 ` David Lang
2002-10-10 14:51 ` Denis Vlasenko
2002-10-08 19:53 ` Matthias Schniedermeyer
2002-10-08 19:59 ` Chris Wedgwood
2002-10-08 20:03 ` Andrew Morton
2002-10-08 20:34 ` Matthias Schniedermeyer
2002-10-08 20:42 ` Andrew Morton
2002-10-08 20:37 ` Larry McVoy
2002-10-09 11:53 ` Roy Sigurd Karlsbakk
2002-10-09 14:10 ` Marco Colombo
2002-10-09 14:14 ` Robert Love
2002-10-09 14:33 ` Richard B. Johnson
2002-10-09 15:27 ` Andreas Dilger
2002-10-09 23:17 ` Jamie Lokier
2002-10-09 23:46 ` Rik van Riel
2002-10-10 0:16 ` Jamie Lokier
2002-10-10 2:39 ` Erik Andersen
2002-10-10 10:33 ` Marco Colombo
2002-10-10 20:00 ` Erik Andersen
-- strict thread matches above, loose matches on Subject: below --
2002-10-11 4:16 Hank Leininger
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