mm/vmscan: remove redundant current_may_throttle() check

Only kswapd can have non-zero nr_immediate, and current_may_throttle()
is always true for kswapd (PF_LESS_THROTTLE bit is never set) thus it's
enough to check stat.nr_immediate only.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Andrey Ryabinin <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6d74b12099bdee287edb85640ad013a886402f1f..403f59edd53e9d58a59783be96d6c42627ca46a2 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1807,7 +1807,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
                 * that pages are cycling through the LRU faster than
                 * they are written so also forcibly stall.
                 */
-               if (stat.nr_immediate && current_may_throttle())
+               if (stat.nr_immediate)
                        congestion_wait(BLK_RW_ASYNC, HZ/10);
        }