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authorMel Gorman <mgorman@techsingularity.net>2016-07-29 01:45:56 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-29 02:07:41 +0300
commit6256c6b499a1689d62ddfcb38d8048f9cd177070 (patch)
tree186dea4bd63c22051ad4ec54fb293d19fcf5fcb4
parent79dafcdca31386cfe0fe95b1c7f30a85209af166 (diff)
downloadlinux-6256c6b499a1689d62ddfcb38d8048f9cd177070.tar.xz
mm, vmscan: remove duplicate logic clearing node congestion and dirty state
Reclaim may stall if there is too much dirty or congested data on a node. This was previously based on zone flags and the logic for clearing the flags is in two places. As congestion/dirty tracking is now tracked on a per-node basis, we can remove some duplicate logic. Link: http://lkml.kernel.org/r/1467970510-21195-12-git-send-email-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@surriel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/vmscan.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 01fe4708e404..8b39b903bd14 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3008,7 +3008,17 @@ static bool zone_balanced(struct zone *zone, int order, int classzone_idx)
{
unsigned long mark = high_wmark_pages(zone);
- return zone_watermark_ok_safe(zone, order, mark, classzone_idx);
+ if (!zone_watermark_ok_safe(zone, order, mark, classzone_idx))
+ return false;
+
+ /*
+ * If any eligible zone is balanced then the node is not considered
+ * to be congested or dirty
+ */
+ clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags);
+ clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags);
+
+ return true;
}
/*
@@ -3154,13 +3164,6 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
if (!zone_balanced(zone, order, 0)) {
classzone_idx = i;
break;
- } else {
- /*
- * If any eligible zone is balanced then the
- * node is not considered congested or dirty.
- */
- clear_bit(PGDAT_CONGESTED, &zone->zone_pgdat->flags);
- clear_bit(PGDAT_DIRTY, &zone->zone_pgdat->flags);
}
}
@@ -3219,11 +3222,8 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx)
if (!populated_zone(zone))
continue;
- if (zone_balanced(zone, sc.order, classzone_idx)) {
- clear_bit(PGDAT_CONGESTED, &pgdat->flags);
- clear_bit(PGDAT_DIRTY, &pgdat->flags);
+ if (zone_balanced(zone, sc.order, classzone_idx))
goto out;
- }
}
/*