From: Rik van Riel <riel@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: userspace pagecache management tool
Date: Sat, 03 Mar 2007 17:25:30 -0500 [thread overview]
Message-ID: <45E9F5DA.2070708@redhat.com> (raw)
In-Reply-To: <20070303140744.b22699dd.akpm@linux-foundation.org>
Andrew Morton wrote:
> Well, backup programs are a unique case. Let's say instead that the user
> has just generated a 600MB ISO image.
>
> The kernel *just doesn't know* whether the user will next try to read the
> kernel tree or will next try to read that ISO image.
>
> That, Rik, is my point, and is the entire point of this work.
I still don't understand why "the backup program flushed my data out
of the cache with POSIX_FADV_DONTNEED" is an improvement over "the
backup program flushed my data out of the cache by reading other files".
Your code may be useful for a few specialized situations, but I don't
see it actually fixing most of the examples you gave in your
announcement, except for the DVD copying one.
--
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is. Each group
calls the other unpatriotic.
next prev parent reply other threads:[~2007-03-03 22:25 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-03 20:29 userspace pagecache management tool Andrew Morton
2007-03-03 20:40 ` Rik van Riel
2007-03-03 21:12 ` Andrew Morton
2007-03-03 21:30 ` Rik van Riel
2007-03-03 21:41 ` bert hubert
2007-03-03 22:14 ` Andrew Morton
2007-03-03 22:19 ` Rik van Riel
2007-03-03 22:26 ` Andrew Morton
2007-03-03 22:28 ` Rik van Riel
2007-03-03 22:38 ` Andrew Morton
2007-03-03 22:56 ` Erik Andersen
2007-03-03 23:01 ` bert hubert
2007-03-03 23:45 ` Andrew Morton
2007-03-06 12:10 ` Pádraig Brady
2007-03-06 21:40 ` Andrew Morton
2007-03-06 21:44 ` Rik van Riel
2007-03-07 11:39 ` Pádraig Brady
2007-03-07 18:50 ` Andrew Morton
2007-03-08 7:59 ` Vaidyanathan Srinivasan
2007-03-08 8:12 ` Andrew Morton
2007-03-03 22:07 ` Andrew Morton
2007-03-03 22:25 ` Rik van Riel [this message]
2007-03-03 22:37 ` Andrew Morton
2007-03-03 22:52 ` Andrew Morton
2007-03-04 0:01 ` Rik van Riel
2007-03-04 1:02 ` Andrew Morton
2007-03-04 1:23 ` Rik van Riel
2007-03-04 1:49 ` Andrew Morton
2007-03-04 1:56 ` Rik van Riel
2007-03-04 12:07 ` Andrew Morton
2007-03-04 14:35 ` Peter Zijlstra
2007-03-04 16:01 ` Rik van Riel
2007-03-03 22:58 ` Ray Lee
2007-03-03 23:34 ` Andrew Morton
2007-03-04 1:02 ` Ray Lee
2007-03-04 1:21 ` Andrew Morton
2007-03-04 0:14 ` Eric St-Laurent
2007-03-04 1:10 ` Andrew Morton
2007-03-04 1:39 ` Rik van Riel
2007-03-04 1:16 ` Lee Revell
2007-03-04 1:39 ` Andrew Morton
2007-03-04 2:35 ` Lee Revell
2007-03-04 4:35 ` Andrew Morton
2007-03-05 11:02 ` Pádraig Brady
2007-03-05 11:12 ` Andrew Morton
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