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Display current tcp failcnt in kmem cgroup

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Glauber Costa 2011-12-11 21:47:08 +00:00 committed by David S. Miller
parent 5a6dd34377
commit ffea59e504
1 changed files with 31 additions and 0 deletions
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31
net/ipv4/tcp_memcontrol.c
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@ -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;