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Subject[PATCH v2 8/9] Display current tcp memory allocation in kmem cgroup
Date
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@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
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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