linux-kernel - Re: [PATCH 1/2 v2] x86: add max

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Message-ID: <4FD7F937.2010101@jp.fujitsu.com>
Date:	Wed, 13 Jun 2012 11:21:43 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Wen Congyang <wency@...fujitsu.com>, rob@...dley.net,
	tglx@...utronix.de, Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	bhelgaas@...gle.com
Subject: Re: [PATCH 1/2 v2] x86: add max_addr boot option

(2012/06/13 1:10), H. Peter Anvin wrote:
> If what you care about is nodes, why not have an option to specify a map?
>

At the first time of our project, we discussed passing node-id as boot option.
But, we found Node-ID is just determined by the pxm ID order in SRAT. That means,
we and our firmware team need to take care of the order of SRAT. But that node-ID
v.s. SRAT relationship is just determined by implemenation, there is no spec,
we thought we can't keep this way in future.

The second thought was specifying PXM. But, with hardware-partitioning-system,
dynamic implementation of SRAT for a partutuion is very confusing...

Then, alternative idea was using mem= boot option. Because our partition system
has fixed address range per each node, it works well.

But now, we know mem= boot option is buggy....it acts as max_addr= option, we
have concerns that 'someone may fix mem= option as sane as ia64. because it's buggy".

We'd like to fix mem= boot option by ourselves and preserve old behavior with max_addr=
boot option, which ia64 has.

Thanks,
-Kame

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