linux-kernel - [PATCH 1/2] mm: memcg: fix memcg file

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Date:   Sun, 27 Dec 2020 10:13:09 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Shakeel Butt <shakeelb@...gle.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] mm: memcg: fix memcg file_dirty numa stat

The kernel updates the per-node NR_FILE_DIRTY stats on page migration
but not the memcg numa stats. That was not an issue until recently the
commit 5f9a4f4a7096 ("mm: memcontrol: add the missing numa_stat interface
for cgroup v2") exposed numa stats for the memcg. So fixing the
file_dirty per-memcg numa stat.

Fixes: 5f9a4f4a7096 ("mm: memcontrol: add the missing numa_stat interface for cgroup v2")
Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
Cc: <stable@...r.kernel.org>
---
 mm/migrate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index ee5e612b4cd8..613794f6a433 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -500,9 +500,9 @@ int migrate_page_move_mapping(struct address_space *mapping,
 			__inc_lruvec_state(new_lruvec, NR_SHMEM);
 		}
 		if (dirty && mapping_can_writeback(mapping)) {
-			__dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY);
+			__dec_lruvec_state(old_lruvec, NR_FILE_DIRTY);
 			__dec_zone_state(oldzone, NR_ZONE_WRITE_PENDING);
-			__inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY);
+			__inc_lruvec_state(new_lruvec, NR_FILE_DIRTY);
 			__inc_zone_state(newzone, NR_ZONE_WRITE_PENDING);
 		}
 	}
-- 
2.29.2.729.g45daf8777d-goog