Re: [RFC][PATCH 4/4] vm-mapped-x-active-lists

[Nick Piggin]

Nick Piggin wrote:

> @@ -714,14 +737,27 @@ shrink_zone(struct zone *zone, int max_s
> 	 * just to make sure that the kernel will slowly sift through the
> 	 * active list.
> 	 */
> -	ratio = (unsigned long)SWAP_CLUSTER_MAX * zone->nr_active /
> -				((zone->nr_inactive | 1) * 2);
> +	nr_active = zone->nr_active_mapped + zone->nr_active_unmapped;
> +	ratio = (unsigned long)SWAP_CLUSTER_MAX * nr_active /
> +				(zone->nr_inactive * 2 + 1);
> +	mapped_ratio = (unsigned long long)ratio * nr_active;
> +	do_div(mapped_ratio, zone->nr_active_mapped+1);

Just for information, this is where you would balance mapped vs unmapped
pages:    do_div(mapped_ratio, 16); /* mapped pages are worth 16 times 
more */

> +
> +	ratio = ratio - mapped_ratio;
> +	atomic_add(ratio+1, &zone->nr_scan_active_unmapped);
> +	count = atomic_read(&zone->nr_scan_active_unmapped);
> +	if (count >= SWAP_CLUSTER_MAX) {
> +		atomic_set(&zone->nr_scan_active_unmapped, 0);
> +		shrink_active_list(zone, &zone->active_unmapped_list,
> +					&zone->nr_active_unmapped, count, ps);
> +	}
>
> -	atomic_add(ratio+1, &zone->nr_scan_active);
> -	count = atomic_read(&zone->nr_scan_active);
> +	atomic_add(mapped_ratio+1, &zone->nr_scan_active_mapped);
> +	count = atomic_read(&zone->nr_scan_active_mapped);
> 	if (count >= SWAP_CLUSTER_MAX) {
> -		atomic_set(&zone->nr_scan_active, 0);
> -		shrink_active_list(zone, &zone->active_list, count, ps);
> +		atomic_set(&zone->nr_scan_active_mapped, 0);
> +		shrink_active_list(zone, &zone->active_mapped_list,
> +					&zone->nr_active_mapped, count, ps);
> 	}
>
> 	atomic_add(max_scan, &zone->nr_scan_inactive);
>
>  

-
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