linux-kernel - Re: [rfc] increase struct page size?!

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Date:	Tue, 22 May 2007 09:58:36 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	ak@...e.de, dada1@...mosbay.com, wli@...omorphy.com,
	npiggin@...e.de, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org
Subject: Re: [rfc] increase struct page size?!

On Mon, 21 May 2007 17:38:58 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> On Tue, 22 May 2007, KAMEZAWA Hiroyuki wrote:
> 
> > For i386(32bit arch), there is not enough space for vmemmap.
> 
> I thought 32 bit would use flatmem? Is memory really sparse on 32 
> bit? Likely difficult due to lack of address space?
> 

Of course, i386 can use flatmem.

I am just afraid that memory hotplug is just for sprasemem.
But I also think we can add memory-hotplug for flatmem if necessary.
(I myself have no plan now. I wonder memory power-save-mode may be supported
 by chipsets.)

-Kame

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