linux-kernel - Re: [PATCH 5 of 6] hotplug-memory: add section

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Date:	Thu, 03 Apr 2008 17:51:12 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH 5 of 6] hotplug-memory: add section_ops

On Thu, 2008-04-03 at 17:05 -0700, Jeremy Fitzhardinge wrote:
> Add a per-section "section_ops" structure,  allowing each section to have
> specific functions for onlining and offlining pages within the section.
> This is used by the Xen balloon driver to make sure that pages are not
> onlined without some physical memory backing them.

This is kinda a lot of code and mucking around for what we actually get
out of it, especially since you just condensed down all the actual
online_page() instances.

I think it might just be nicer to have a global list of these handlers
somewhere.  The Xen driver can just say "put me on the list of
callbacks" and we'll call them at online_page().  I really don't think
we need to be passing an ops structure around.

KAME, did you have some other ideas about this?

-- Dave

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