linux-kernel - Re: [patch 1/2] x86: add numa=possible command line option

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Message-ID: <20101122154317.GC4137@hack>
Date:	Mon, 22 Nov 2010 23:43:17 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Shaohui Zheng <shaohui.zheng@...el.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Haicheng Li <haicheng.li@...el.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Subject: Re: [patch 1/2] x86: add numa=possible command line option

On Sun, Nov 21, 2010 at 01:46:07PM -0800, David Rientjes wrote:
>On Sun, 21 Nov 2010, Américo Wang wrote:
>> Also, numa=possible= is not as clear as numa=max=, for me at least.
>> 
>
>I like name, but it requires that you know how many nodes that system 
>already has.  In other words, numa=possible=4 allows you to specify that 4 
>additional nodes will be possible, but initially offline, for this or 
>other purposes.  numa=max=4 would be no-op if the system actually had 4 
>nodes.
>
>I chose numa=possible over numa=additional because it is more clearly tied 
>to node_possible_map, which is the only thing it modifies.

Okay, I thought "possible" means "max", but "possible" means "addtional" here.
It's clear for me now.

Thanks!

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