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Subject[PATCH v8 8/9] Display current tcp failcnt in kmem cgroup
Date
This patch introduces kmem.tcp.failcnt file, living in the
kmem_cgroup filesystem. Following the pattern in the other
memcg resources, this files keeps a counter of how many times
allocation failed due to limits being hit in this cgroup.
The root cgroup will always show a failcnt of 0.

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>
---
net/ipv4/tcp_memcontrol.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index 9481f23..d438fba 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -9,6 +9,7 @@
static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft);
static int tcp_cgroup_write(struct cgroup *cont, struct cftype *cft,
const char *buffer);
+static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event);

static struct cftype tcp_files[] = {
{
@@ -22,6 +23,12 @@ static struct cftype tcp_files[] = {
.read_u64 = tcp_cgroup_read,
.private = RES_USAGE,
},
+ {
+ .name = "kmem.tcp.failcnt",
+ .private = RES_FAILCNT,
+ .trigger = tcp_cgroup_reset,
+ .read_u64 = tcp_cgroup_read,
+ },
};

static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
@@ -197,12 +204,36 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
case RES_USAGE:
val = tcp_read_usage(memcg);
break;
+ case RES_FAILCNT:
+ val = tcp_read_stat(memcg, RES_FAILCNT, 0);
+ break;
default:
BUG();
}
return val;
}

+static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event)
+{
+ struct mem_cgroup *memcg;
+ struct tcp_memcontrol *tcp;
+ struct cg_proto *cg_proto;
+
+ memcg = mem_cgroup_from_cont(cont);
+ cg_proto = tcp_prot.proto_cgroup(memcg);
+ if (!cg_proto)
+ return 0;
+ tcp = tcp_from_cgproto(cg_proto);
+
+ switch (event) {
+ case RES_FAILCNT:
+ res_counter_reset_failcnt(&tcp->tcp_memory_allocated);
+ break;
+ }
+
+ return 0;
+}
+
unsigned long long tcp_max_memory(const struct mem_cgroup *memcg)
{
struct tcp_memcontrol *tcp;
--
1.7.6.4


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