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Re: SV: Need ammo against BSD Fud

To: James Simmons <jsimmons@edgeglobal.com>
Subject: Re: SV: Need ammo against BSD Fud
From: "David Mentr'e" <David.Mentre@irisa.fr>
Date: 25 Sep 1999 21:05:41 +0200
Cc: Andrea Arcangeli <andrea@suse.de>, linux-mm@kvack.org
In-Reply-To: James Simmons's message of "Sat, 25 Sep 1999 12:28:30 -0400 (EDT)"
References: <Pine.LNX.4.10.9909251226070.22660-100000@imperial.edgeglobal.com>
Sender: owner-linux-mm@kvack.org
User-Agent: Gnus/5.070096 (Pterodactyl Gnus v0.96) Emacs/20.4

James Simmons <jsimmons@edgeglobal.com> writes:

> Whats page colouring?

This is a scheme that tries to allocate pages to minimize cache
conflicts.

More precisely : if a process need a page, the kernel tries to give him
a page that will not conflict (that is to say will use a different cache
set) with its actual set of pages.

Some "academical" studies have shown that some gain are
possible. However I do not now any successful real-life implementation
of page colouring. 

Some time ago, David Miller (of sparc, ultrasparc and gcc-sparc64 fame)
implemented a minimal coulouring support. Should be in some archives.


david
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 Opinions expressed here are only mine.
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References:
- Re: SV: Need ammo against BSD Fud
  - From: James Simmons <jsimmons@edgeglobal.com>

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