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
In small high zone(ex, 40M movable zone), reclaim priority
could be raised easily so congestion_wait of balance_pgdat can make
kswapd sleep unnecessarily so process ends up entering into direct
reclaim path. It means processes's latency would be longer.
This patch changes congestion_wait with wait
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