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

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Date:	Fri, 4 Apr 2008 10:47:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	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, 03 Apr 2008 17:51:12 -0700
Dave Hansen <dave@...ux.vnet.ibm.com> wrote:

> 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?
> 

At first. please don't call online_page() handler in add_memory() phase.
online_page() handler should be called in online_pages().

Passing handler to online_pages() is much easier and it's ok to me.


Thanks,
-Kame

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