linux-kernel - Re: [PATCH 2 of 4] hotplug-memory: adding non-section-aligned memory is bad

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Message-Id: <20080328133940.dc3be13d.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 28 Mar 2008 13:39:40 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Yasunori Goto <y-goto@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Christoph Lameter <clameter@....com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2 of 4] hotplug-memory: adding non-section-aligned
 memory is bad

On Thu, 27 Mar 2008 21:20:18 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> > How about capturing online_page() by balloon ?
> >   
> 
> You're saying that using online_page() on each page on its own is not 
> sufficient?
> 
online_page() just remove PG_reserved flags and free it. 
Not dealing with global data, like total pages, zonelist, etc.

> > ex.)
> > ==
> > call add_memory() to create mem_map
> > call online_pages() against the whole section. <=== call this without sysfs.
> >      online_pages() do misc. jobs
> >         call online_page() one by one (arch dependent) called by walk_memory_resource.
> >             online_page() will finally call free_page(page).
> >             <=========== Xen capture here.
> >             Don't free onlined page and swallow them into baloon driver.
> > ==
> >   
> 
> I'm not sure what you mean by "capture" here.  Do you mean a hook?  I'd 
> rather not have to put some Xen-specific hook in here.
> 
ok.

> What would happen if I did online_pages(pfn, 1) on each page as I 
> populate it?
> 
I think (hope) it works well. But it seems no one tries to do that.

Thanks,
-Kame



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