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Subject[PATCH 04/10] vmscan: Synchronous lumpy reclaim should not call congestion_wait()
Date
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

congestion_wait() mean "waiting queue congestion is cleared". However,
synchronous lumpy reclaim does not need this congestion_wait() as
shrink_page_list(PAGEOUT_IO_SYNC) uses wait_on_page_writeback()
and it provides the necessary waiting.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
---
mm/vmscan.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index eabe987..5979850 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1341,8 +1341,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct zone *zone,

/* Check if we should syncronously wait for writeback */
if (should_reclaim_stall(nr_taken, nr_reclaimed, priority, sc)) {
- wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
-
/*
* The attempt at page out may have made some
* of the pages active, mark them inactive again.
--
1.7.1


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