1 files changed, 16 insertions, 15 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index bee53495a829..cd5dc3faaa57 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1780,6 +1780,20 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
                 set_bit(PGDAT_WRITEBACK, &pgdat->flags);
 
         /*
+         * If dirty pages are scanned that are not queued for IO, it
+         * implies that flushers are not doing their job. This can
+         * happen when memory pressure pushes dirty pages to the end of
+         * the LRU before the dirty limits are breached and the dirty
+         * data has expired. It can also happen when the proportion of
+         * dirty pages grows not through writes but through memory
+         * pressure reclaiming all the clean cache. And in some cases,
+         * the flushers simply cannot keep up with the allocation
+         * rate. Nudge the flusher threads in case they are asleep.
+         */
+        if (stat.nr_unqueued_dirty == nr_taken)
+                wakeup_flusher_threads(WB_REASON_VMSCAN);
+
+        /*
          * Legacy memcg will stall in page writeback so avoid forcibly
          * stalling here.
          */
@@ -1791,22 +1805,9 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
                 if (stat.nr_dirty && stat.nr_dirty == stat.nr_congested)
                         set_bit(PGDAT_CONGESTED, &pgdat->flags);
 
-                /*
-                 * If dirty pages are scanned that are not queued for IO, it
-                 * implies that flushers are not doing their job. This can
-                 * happen when memory pressure pushes dirty pages to the end of
-                 * the LRU before the dirty limits are breached and the dirty
-                 * data has expired. It can also happen when the proportion of
-                 * dirty pages grows not through writes but through memory
-                 * pressure reclaiming all the clean cache. And in some cases,
-                 * the flushers simply cannot keep up with the allocation
-                 * rate. Nudge the flusher threads in case they are asleep, but
-                 * also allow kswapd to start writing pages during reclaim.
-                 */
-                if (stat.nr_unqueued_dirty == nr_taken) {
-                        wakeup_flusher_threads(WB_REASON_VMSCAN);
+                /* Allow kswapd to start writing pages during reclaim. */
+                if (stat.nr_unqueued_dirty == nr_taken)
                         set_bit(PGDAT_DIRTY, &pgdat->flags);
-                }
 
                 /*
                  * If kswapd scans pages marked marked for immediate