linux-kernel - Re: [PATCH] x86-64: improve e820_search

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Message-ID: <20090509100008.GD23223@one.firstfloor.org>
Date:	Sat, 9 May 2009 12:00:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Jan Beulich <jbeulich@...ell.com>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86-64: improve e820_search_gap()

> However, as far as querying SRAT, I don't like the idea of spreading the 
> knowledge of the system memory map out between a bunch of different 
> places, each of which have a little piece of the puzzle.  It puts a huge 
> onus on the user to know what mechanisms are actually available, and 
> really makes a shitty interface.

AFAIK another popular OS always combines mappings from all sources (e820,
SRAT, PCI, PNP, ACPI etc.) in the query before allocating anything.
Something like that might be a reasonable long term direction for Linux
too, but it's probably also a can of worms to handle the conflicts
between the various sources (e.g. e820 reserves a lot of things
in other sources too). It would be a rather large change.
Maybe that would handle the systems I thought of above.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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