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Subject: [PATCH] mm: Fix recent_rotated history
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
To:     akpm@linux-foundation.org, daniel.m.jordan@oracle.com,
        mhocko@suse.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        ktkhai@virtuozzo.com
Date:   Tue, 28 May 2019 19:09:02 +0300
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Johannes pointed that after commit 886cf1901db9
we lost all zone_reclaim_stat::recent_rotated
history. This commit fixes that.

Fixes: 886cf1901db9 "mm: move recent_rotated pages calculation to shrink_inactive_list()"
Reported-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
 mm/vmscan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index d9c3e873eca6..1d49329a4d7d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1953,8 +1953,8 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	if (global_reclaim(sc))
 		__count_vm_events(item, nr_reclaimed);
 	__count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
-	reclaim_stat->recent_rotated[0] = stat.nr_activate[0];
-	reclaim_stat->recent_rotated[1] = stat.nr_activate[1];
+	reclaim_stat->recent_rotated[0] += stat.nr_activate[0];
+	reclaim_stat->recent_rotated[1] += stat.nr_activate[1];
 
 	move_pages_to_lru(lruvec, &page_list);