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

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Date:	Tue, 18 Aug 2009 15:57:00 -0700 (PDT)
From:	Vincent Li <macli@....ubc.ca>
To:	Mel Gorman <mel@....ul.ie>
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, 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.

> +	 * 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
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