[PATCH v2 8/9] Display current tcp memory allocation in kmem cgroup

[Glauber Costa]

This patch introduces kmem.tcp_current_memory file, living in the
kmem_cgroup filesystem. It is a simple read-only file that displays the
amount of kernel memory currently consumed by the cgroup.

Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
CC: David S. Miller <davem@xxxxxxxxxxxxx>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@xxxxxxxxxxxxxx>
CC: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
---
 net/ipv4/tcp.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e1918fa..ff5c0e0 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -365,12 +365,29 @@ static u64 tcp_read_maxmem(struct cgroup *cgrp, struct cftype *cft)
 	return ret;
 }
 
+static u64 tcp_read_curmem(struct cgroup *cgrp, struct cftype *cft)
+{
+	struct kmem_cgroup *sg = kcg_from_cgroup(cgrp);
+	u64 ret;
+
+	if (!cgroup_lock_live_group(cgrp))
+		return -ENODEV;
+	ret = atomic_long_read(&sg->tcp_memory_allocated);
+
+	cgroup_unlock();
+	return ret;
+}
+
 static struct cftype tcp_files[] = {
 	{
 		.name = "tcp_maxmem",
 		.write_u64 = tcp_write_maxmem,
 		.read_u64 = tcp_read_maxmem,
 	},
+	{
+		.name = "tcp_current_memory",
+		.read_u64 = tcp_read_curmem,
+	},
 };
 
 int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
-- 
1.7.6

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