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Date: Thu, 10 Oct 2002 15:44:17 -0700
From: Mike Fedyk <mfedyk@matchmail.com>
To: Giuliano Pochini <pochini@shiny.it>
Cc: Helge Hafting <helgehaf@aitel.hist.no>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] O_STREAMING - flag for optimal streaming I/O
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References: <3DA55E0C.24033BB5@aitel.hist.no> <XFMail.20021010151735.pochini@shiny.it>
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On Thu, Oct 10, 2002 at 03:17:35PM +0200, Giuliano Pochini wrote:
> O_STREAMING is a way to reduce cache footprint of some
> files, ad it does the job very well, unless those files
> are accessed concurrently by two of more processes.
> Thing again about to backup a large database. I don't
> want to use tar because it kills the caches. I would
> like a way to read the db so that the cached part of
> the db (the 20% which gets 80% of accesses) is not
> expunged.

Unless you are pausing the database (causing the files on disk to be in a
useful state) and then reading the file you will have trouble.  Anything
else will have to syncronize with the database itself, and thus can't use
O_STREAMING.
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