[PATCH 4/8] mm: vmscan: Set zone flags before blocking

[Mel Gorman]

In shrink_page_list a decision may be made to stall and flag a zone
as ZONE_WRITEBACK so that if a large number of unqueued dirty pages are
encountered later then the reclaimer will stall. Set ZONE_WRITEBACK before
potentially going to sleep so it is noticed sooner.

Signed-off-by: Mel Gorman 
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5b1a79c..5f80d01 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1445,8 +1445,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct 
lruvec *lruvec,
 */
if (nr_writeback && nr_writeback >=
(nr_taken >> (DEF_PRIORITY - sc->priority))) {
-   wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
zone_set_flag(zone, ZONE_WRITEBACK);
+   wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
}
 
/*
-- 
1.8.1.4

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[PATCH 4/8] mm: vmscan: Set zone flags before blocking

[Mel Gorman]

In shrink_page_list a decision may be made to stall and flag a zone
as ZONE_WRITEBACK so that if a large number of unqueued dirty pages are
encountered later then the reclaimer will stall. Set ZONE_WRITEBACK before
potentially going to sleep so it is noticed sooner.

Signed-off-by: Mel Gorman mgor...@suse.de
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5b1a79c..5f80d01 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1445,8 +1445,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct 
lruvec *lruvec,
 */
if (nr_writeback  nr_writeback =
(nr_taken  (DEF_PRIORITY - sc-priority))) {
-   wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
zone_set_flag(zone, ZONE_WRITEBACK);
+   wait_iff_congested(zone, BLK_RW_ASYNC, HZ/10);
}
 
/*
-- 
1.8.1.4

--
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