[PATCH] mm/compaction: clear total_{migrate,free}_scanned before scanning a new zone

[Yafang Shao <laoar.shao@gmail.com>]

total_{migrate,free}_scanned will be added to COMPACTMIGRATE_SCANNED and
COMPACTFREE_SCANNED in compact_zone(). We should clear them before scanning
a new zone.
In the proc triggered compaction, we forgot clearing them.

Fixes: 7f354a548d1c ("mm, compaction: add vmstats for kcompactd work")
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yafang Shao <shaoyafang@didiglobal.com>
---
 mm/compaction.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 9e1b9ac..a109b45 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2405,8 +2405,6 @@ static void compact_node(int nid)
 	struct zone *zone;
 	struct compact_control cc = {
 		.order = -1,
-		.total_migrate_scanned = 0,
-		.total_free_scanned = 0,
 		.mode = MIGRATE_SYNC,
 		.ignore_skip_hint = true,
 		.whole_zone = true,
@@ -2422,6 +2420,8 @@ static void compact_node(int nid)
 
 		cc.nr_freepages = 0;
 		cc.nr_migratepages = 0;
+		cc.total_migrate_scanned = 0;
+		cc.total_free_scanned = 0;
 		cc.zone = zone;
 		INIT_LIST_HEAD(&cc.freepages);
 		INIT_LIST_HEAD(&cc.migratepages);
-- 
1.8.3.1