linux-kernel - Re: [PATCH 1/3] page-allocator: Split per-cpu list into one-list-per-migrate-type

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Date:	Wed, 19 Aug 2009 09:57:14 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Vincent Li <macli@....ubc.ca>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] page-allocator: Split per-cpu list into
	one-list-per-migrate-type

On Tue, Aug 18, 2009 at 03:57:00PM -0700, Vincent Li wrote:
> On Tue, 18 Aug 2009, Mel Gorman wrote:
> 
> > +	/*
> > +	 * We only track unreclaimable, reclaimable and movable on pcp lists.
> 			 ^^^^^^^^^^^^^  
> Is it unmovable? I don't see unreclaimable migrate type on pcp lists. 
> Just ask to make sure I undsterstand the comment right.
> 

It should have said unmovable. Sorry

> > +	 * Free ISOLATE pages back to the allocator because they are being
> > +	 * offlined but treat RESERVE as movable pages so we can get those
> > +	 * areas back if necessary. Otherwise, we may have to free
> > +	 * excessively into the page allocator
> > +	 */
> > +	if (migratetype >= MIGRATE_PCPTYPES) {
> > +		if (unlikely(migratetype == MIGRATE_ISOLATE)) {
> > +			free_one_page(zone, page, 0, migratetype);
> > +			goto out;
> > +		}
> > +		migratetype = MIGRATE_MOVABLE;
> > +	}
> > +
> 
> Vincent Li
> Biomedical Research Center
> University of British Columbia
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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