Re: [RFC PATCH 11/12] mm: add the PCP interface

[Dave Hansen]

On 06/04/2015 06:04 AM, Xishi Qiu wrote:
>  	spin_lock(&zone->lock);
>  	for (i = 0; i < count; ++i) {
> -		struct page *page = __rmqueue(zone, order, migratetype);
> +		struct page *page;
> +
> +		if (is_migrate_mirror(migratetype))
> +			page = __rmqueue_smallest(zone, order, migratetype);
> +		else
> +			page = __rmqueue(zone, order, migratetype);
>  		if (unlikely(page == NULL))
>  			break;

Why is this necessary/helpful?  The changelog doesn't tell me either. :(

Why was this code modified in stead of putting the changes in
__rmqueue() itself (like CMA did)?
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