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

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Message-Id: <20070522093050.0320d092.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 22 May 2007 09:30:50 +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 10:08:06 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> On Sun, 20 May 2007, Andi Kleen wrote:
> 
> > Besides with the scarcity of pageflags it might make sense to do "64 bit only"
> > flags at some point.
> 
> There is no scarcity of page flags. There is
> 
> 1. Hoarding by Andrew
> 
> 2. Waste by Sparsemem (section flags no longer necessary with
>    virtual memmap)

For i386(32bit arch), there is not enough space for vmemmap.
For 64bit arch, page flags are not exhausted yet.

-Kame


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