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

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Message-ID: <4FD65FD4.4060705@zytor.com>
Date:	Mon, 11 Jun 2012 14:15:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	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

On 06/11/2012 01:44 AM, Wen Congyang wrote:
> Currently, the boot option max_addr is only supported on ia64 platform.
> We also need it on x86 platform.
> For example:
> There are two nodes:
>  NODE#0  address range 0x00000000 00000000 - 0x00010000 00000000
>  NODE#1  address range 0x00010000 00000000 - 0x00020000 00000000
> If we only want to use node0, we can specify the max_addr. The boot
> option "mem=" can do the same thing now. But the boot option "mem="
> means the total memory used by the system. If we tell the user
> that the boot option "mem=" can do this, it will confuse the user.
> So we need an new boot option "max_addr" on x86 platform.
> 

I fail to see what this does that cannot be done with the
since-long-existing memmap= option.  Could you address why memmap=
doesn't match your needs?

	-hpa

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