Don't trigger congestion wait on dirty-but-not-writeout pages

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / vmscan.c

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6ef876c..6ef484f 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1540,19 +1540,18 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
                 * If dirty pages are scanned that are not queued for IO, it
                 * implies that flushers are not keeping up. In this case, flag
                 * the zone ZONE_TAIL_LRU_DIRTY and kswapd will start writing
-                * pages from reclaim context. It will forcibly stall in the
-                * next check.
+                * pages from reclaim context.
                 */
                if (nr_unqueued_dirty == nr_taken)
                        zone_set_flag(zone, ZONE_TAIL_LRU_DIRTY);
 
                /*
-                * In addition, if kswapd scans pages marked marked for
-                * immediate reclaim and under writeback (nr_immediate), it
-                * implies that pages are cycling through the LRU faster than
+                * If kswapd scans pages marked marked for immediate
+                * reclaim and under writeback (nr_immediate), it implies
+                * that pages are cycling through the LRU faster than
                 * they are written so also forcibly stall.
                 */
-               if (nr_unqueued_dirty == nr_taken || nr_immediate)
+               if (nr_immediate)
                        congestion_wait(BLK_RW_ASYNC, HZ/10);
        }