linux-kernel - Re: + memory-hotplug-update-zone-pcp-at-memory-online.patch added to -mm tree

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Date:	Tue, 30 Jun 2009 10:21:34 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Shaohua Li <shaohua.li@...el.com>
cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"mel@....ul.ie" <mel@....ul.ie>,
	"Zhao, Yakui" <yakui.zhao@...el.com>
Subject: Re: + memory-hotplug-update-zone-pcp-at-memory-online.patch added
 to -mm tree

On Tue, 30 Jun 2009, Shaohua Li wrote:

> > foreach possible cpu?
> Just follows zone_pcp_init(), do you think we should change that too?

I plan to change that but for now this would be okay.

> > > +		struct per_cpu_pageset *pset;
> > > +		struct per_cpu_pages *pcp;
> > > +
> > > +		pset = zone_pcp(zone, cpu);
> > > +		pcp = &pset->pcp;
> > > +
> > > +		local_irq_save(flags);
> > > +		free_pages_bulk(zone, pcp->count, &pcp->list, 0);
> >
> > There are no pages in the pageset since the pcp batch is zero right?
> It might not be zero for a populated zone, see above comments.

But you are populating an unpopulated zone?

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