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SubjectRe: [PATCH 2/5] vmscan: sleep only if backingdev is congested
On 08/22/2012 03:15 AM, Minchan Kim wrote:

> +++ b/mm/vmscan.c
> @@ -2705,8 +2705,16 @@ loop_again:
> if (total_scanned && (sc.priority < DEF_PRIORITY - 2)) {
> if (has_under_min_watermark_zone)
> count_vm_event(KSWAPD_SKIP_CONGESTION_WAIT);
> - else
> - congestion_wait(BLK_RW_ASYNC, HZ/10);
> + else {
> + for (i = 0; i <= end_zone; i++) {
> + struct zone *zone = pgdat->node_zones
> + + i;
> + if (!populated_zone(zone))
> + continue;
> + wait_iff_congested(zone, BLK_RW_ASYNC,
> + HZ/10);
> + }
> + }
> }

Do we really want to wait on every zone?

That could increase the sleep time by a factor 3.

--
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