linux-kernel - [PATCH v4 1/7] mm: memcontrol: fix NR_ANON

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Message-Id: <20201211041954.79543-2-songmuchun@bytedance.com>
Date:   Fri, 11 Dec 2020 12:19:48 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org, adobriyan@...il.com,
        akpm@...ux-foundation.org, hannes@...xchg.org, mhocko@...nel.org,
        vdavydov.dev@...il.com, hughd@...gle.com, shakeelb@...gle.com,
        guro@...com, samitolvanen@...gle.com, feng.tang@...el.com,
        neilb@...e.de, iamjoonsoo.kim@....com, rdunlap@...radead.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH v4 1/7] mm: memcontrol: fix NR_ANON_THPS accounting in charge moving

The unit of NR_ANON_THPS is HPAGE_PMD_NR already. So it should inc/dec
by one rather than nr_pages.

Fixes: 468c398233da ("mm: memcontrol: switch to native NR_ANON_THPS counter")
Signed-off-by: Muchun Song <songmuchun@...edance.com>
Acked-by: Michal Hocko <mhocko@...e.com>
Acked-by: Johannes Weiner <hannes@...xchg.org>
Reviewed-by: Roman Gushchin <guro@...com>
---
 mm/memcontrol.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b80328f52fb4..8818bf64d6fe 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5653,10 +5653,8 @@ static int mem_cgroup_move_account(struct page *page,
 			__mod_lruvec_state(from_vec, NR_ANON_MAPPED, -nr_pages);
 			__mod_lruvec_state(to_vec, NR_ANON_MAPPED, nr_pages);
 			if (PageTransHuge(page)) {
-				__mod_lruvec_state(from_vec, NR_ANON_THPS,
-						   -nr_pages);
-				__mod_lruvec_state(to_vec, NR_ANON_THPS,
-						   nr_pages);
+				__dec_lruvec_state(from_vec, NR_ANON_THPS);
+				__inc_lruvec_state(to_vec, NR_ANON_THPS);
 			}
 
 		}
-- 
2.11.0