[RFC PATCH 7/7] memcg: do not modify rstat tree for zero updates

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In some situations, we may end up calling memcg_rstat_updated() with a
value of 0, which means the stat was not actually updated. An example is
if we fail to reclaim any pages in shrink_folio_list().

Do not add the cgroup to the rstat updated tree in this case, to avoid
unnecessarily flushing it.

Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
 mm/memcontrol.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 39a9c7a978ae..7afd29399409 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -618,6 +618,9 @@ static inline void memcg_rstat_updated(struct mem_cgroup *memcg, int val)
 	unsigned int x;
+	if (!val)
+		return;
 	cgroup_rstat_updated(memcg->css.cgroup, smp_processor_id());
 	x = __this_cpu_add_return(stats_updates, abs(val));

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