[PATCH] mm: introduce entrance for root_mem_cgroup's current

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From: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx>

Introducing memory.root_current for the memory charges on root_mem_cgroup.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@xxxxxxxxxx>
---
 mm/memcontrol.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ab457f0..158d4232 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6681,6 +6681,11 @@ static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
 
 static struct cftype memory_files[] = {
 	{
+		.name = "root_current",
+		.flags = CFTYPE_ONLY_ON_ROOT,
+		.read_u64 = memory_current_read,
+	},
+	{
 		.name = "current",
 		.flags = CFTYPE_NOT_ON_ROOT,
 		.read_u64 = memory_current_read,
-- 
1.9.1





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