[RFC] memcg: Add swappiness to cgroup2

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Even if cgroup2 has swap.max, swappiness is still a very useful config.
This commit add swappiness to cgroup2.

Signed-off-by: Hui Zhu <teawaterz@xxxxxxxxxxxxxxxxx>
---
 mm/memcontrol.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c5b5f74..e966396 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -7143,6 +7143,11 @@ static struct cftype swap_files[] = {
 		.file_offset = offsetof(struct mem_cgroup, swap_events_file),
 		.seq_show = swap_events_show,
 	},
+	{
+		.name = "swappiness",
+		.read_u64 = mem_cgroup_swappiness_read,
+		.write_u64 = mem_cgroup_swappiness_write,
+	},
 	{ }	/* terminate */
 };
 
-- 
2.7.4




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