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Subject[PATCH v2 2/4] mm/vmscan: remove redundant current_may_throttle() check
Date
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.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6d74b12099bd..403f59edd53e 100644
--- 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);
}

--
2.16.1
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