linux-kernel - Re: [PATCH][2.6.20-rc1-mm1] sparsemem vmem_map optimzed pfn

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Message-Id: <20061217100258.faf504a9.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sun, 17 Dec 2006 10:02:58 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, clameter@...r.sgi.com,
	apw@...dowen.org, heiko.carstens@...ibm.com, bob.picco@...com
Subject: Re: [PATCH][2.6.20-rc1-mm1] sparsemem vmem_map optimzed pfn_valid()
 [0/2]

On Sat, 16 Dec 2006 10:38:53 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:

> On Sat, 16 Dec 2006, KAMEZAWA Hiroyuki wrote:
> 
> > By this, we'll not access mem_section[] in usual ops.
> 
> Why do we need mem_section? We have a page table that fulfills the same 
> role.
> 
Basically, we don't need it.
But I use mem_section[] in bootstrap and I want to keep patches small in this
time. 
I think it's not too late that we'll consider removing it after implementing
memory hot unplug.(and confirm we never use it.)

-Kame 

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