linux-kernel - [PATCH 5.2 378/413] mm/memcontrol: fix wrong statistics in memory.stat

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Date:   Wed, 24 Jul 2019 21:21:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Yafang Shao <shaoyafang@...iglobal.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.2 378/413] mm/memcontrol: fix wrong statistics in memory.stat

From: Yafang Shao <laoar.shao@...il.com>

commit dd9239900e12db84c198855b262ae7796db1123b upstream.

When we calculate total statistics for memcg1_stats and memcg1_events,
we use the the index 'i' in the for loop as the events index.  Actually
we should use memcg1_stats[i] and memcg1_events[i] as the events index.

Link: http://lkml.kernel.org/r/1562116978-19539-1-git-send-email-laoar.shao@gmail.com
Fixes: 42a300353577 ("mm: memcontrol: fix recursive statistics correctness & scalabilty").
Signed-off-by: Yafang Shao <laoar.shao@...il.com
Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Yafang Shao <shaoyafang@...iglobal.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/memcontrol.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3530,12 +3530,13 @@ static int memcg_stat_show(struct seq_fi
 		if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
 			continue;
 		seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i],
-			   (u64)memcg_page_state(memcg, i) * PAGE_SIZE);
+			   (u64)memcg_page_state(memcg, memcg1_stats[i]) *
+			   PAGE_SIZE);
 	}

 	for (i = 0; i < ARRAY_SIZE(memcg1_events); i++)
 		seq_printf(m, "total_%s %llu\n", memcg1_event_names[i],
-			   (u64)memcg_events(memcg, i));
+			   (u64)memcg_events(memcg, memcg1_events[i]));

 	for (i = 0; i < NR_LRU_LISTS; i++)
 		seq_printf(m, "total_%s %llu\n", mem_cgroup_lru_names[i],