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authorGlauber Costa <glommer@parallels.com>2011-12-12 01:47:07 +0400
committerDavid S. Miller <davem@davemloft.net>2011-12-13 04:04:11 +0400
commit5a6dd343770d2ae2c25f7a4b1998c091e6252f42 (patch)
tree2675741dd0e09d0099502da36cfb06a7b63dc746 /net/ipv4/tcp_memcontrol.c
parent3aaabe2342c36bf48567b88fa78b819eee14bb5e (diff)
downloadlinux-5a6dd343770d2ae2c25f7a4b1998c091e6252f42.tar.xz
Display current tcp memory allocation in kmem cgroup
This patch introduces kmem.tcp.usage_in_bytes 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> Reviewed-by: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com> CC: David S. Miller <davem@davemloft.net> CC: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_memcontrol.c')
-rw-r--r--net/ipv4/tcp_memcontrol.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index e3533903409d..9481f235803e 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -17,6 +17,11 @@ static struct cftype tcp_files[] = {
.read_u64 = tcp_cgroup_read,
.private = RES_LIMIT,
},
+ {
+ .name = "kmem.tcp.usage_in_bytes",
+ .read_u64 = tcp_cgroup_read,
+ .private = RES_USAGE,
+ },
};
static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
@@ -167,6 +172,19 @@ static u64 tcp_read_stat(struct mem_cgroup *memcg, int type, u64 default_val)
return res_counter_read_u64(&tcp->tcp_memory_allocated, type);
}
+static u64 tcp_read_usage(struct mem_cgroup *memcg)
+{
+ struct tcp_memcontrol *tcp;
+ struct cg_proto *cg_proto;
+
+ cg_proto = tcp_prot.proto_cgroup(memcg);
+ if (!cg_proto)
+ return atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT;
+
+ tcp = tcp_from_cgproto(cg_proto);
+ return res_counter_read_u64(&tcp->tcp_memory_allocated, RES_USAGE);
+}
+
static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
@@ -176,6 +194,9 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
case RES_LIMIT:
val = tcp_read_stat(memcg, RES_LIMIT, RESOURCE_MAX);
break;
+ case RES_USAGE:
+ val = tcp_read_usage(memcg);
+ break;
default:
BUG();
}