1 files changed, 11 insertions, 1 deletions

diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index d438fba31ba8..171d7b64f803 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -29,6 +29,12 @@ static struct cftype tcp_files[] = {
                 .trigger = tcp_cgroup_reset,
                 .read_u64 = tcp_cgroup_read,
         },
+        {
+                .name = "kmem.tcp.max_usage_in_bytes",
+                .private = RES_MAX_USAGE,
+                .trigger = tcp_cgroup_reset,
+                .read_u64 = tcp_cgroup_read,
+        },
 };
 
 static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
@@ -205,7 +211,8 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
                 val = tcp_read_usage(memcg);
                 break;
         case RES_FAILCNT:
-                val = tcp_read_stat(memcg, RES_FAILCNT, 0);
+        case RES_MAX_USAGE:
+                val = tcp_read_stat(memcg, cft->private, 0);
                 break;
         default:
                 BUG();
@@ -226,6 +233,9 @@ static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event)
         tcp = tcp_from_cgproto(cg_proto);
 
         switch (event) {
+        case RES_MAX_USAGE:
+                res_counter_reset_max(&tcp->tcp_memory_allocated);
+                break;
         case RES_FAILCNT:
                 res_counter_reset_failcnt(&tcp->tcp_memory_allocated);
                 break;