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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/