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Date: Thu, 10 Oct 2002 10:33:36 +0200 (CEST)
From: Giuliano Pochini <pochini@shiny.it>
To: Erik Andersen <andersen@codepoet.org>
Subject: Re: [PATCH] O_STREAMING - flag for optimal streaming I/O
Cc: linux-kernel@vger.kernel.org, Mark Mielke <mark@mark.mielke.cc>,
       Jamie Lokier <lk@tantalophile.demon.co.uk>, Robert Love <rml@tech9.net>
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On 10-Oct-2002 Erik Andersen wrote:
> I don't think grep is a very good candidate for O_STREAMING.  I
> usually want the stuff I grep to stay in cache.  O_STREAMING is
> much better suited to applications like ogle, vlc, xine, xmovie,
> xmms etc since there is little reason for the OS to cache things
> like songs and movies you aren't likely to hear/see again any
> time soon.

The kernel already have cache pruning algorithm. O_STREAMING logic
should not clear caches if there is no need to do that. We could
fake the age of the pages loaded with O_STR to make the kernel
discard them earlier (oh, I SUPPOSE pages have an age to make
a lru replacement algorithm possible).


Bye.

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