linux-kernel - Re: [PATCH 3 of 4] sparsemem: reduce i386 PAE section size

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Message-ID: <Pine.LNX.4.64.0803271734450.10635@schroedinger.engr.sgi.com>
Date:	Thu, 27 Mar 2008 17:35:42 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3 of 4] sparsemem: reduce i386 PAE section size

On Thu, 27 Mar 2008, Jeremy Fitzhardinge wrote:

> A 1G section size makes memory hotplug too coarse in a virtual
> environment.  Retuce it by a factor of 2 to 512M.  I would have liked
> to make it smaller, but it runs out of reserved flags in the page flags.

There are patches in mm which changes that situation. You should have 5 or 
6 more flags to play with.

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