Display current tcp failcnt in kmem cgroup
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>
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@ -9,6 +9,7 @@
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static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft);
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static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft);
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static int tcp_cgroup_write(struct cgroup *cont, struct cftype *cft,
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static int tcp_cgroup_write(struct cgroup *cont, struct cftype *cft,
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const char *buffer);
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const char *buffer);
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static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event);
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static struct cftype tcp_files[] = {
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static struct cftype tcp_files[] = {
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{
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{
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@ -22,6 +23,12 @@ static struct cftype tcp_files[] = {
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.read_u64 = tcp_cgroup_read,
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.read_u64 = tcp_cgroup_read,
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.private = RES_USAGE,
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.private = RES_USAGE,
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},
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},
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{
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.name = "kmem.tcp.failcnt",
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.private = RES_FAILCNT,
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.trigger = tcp_cgroup_reset,
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.read_u64 = tcp_cgroup_read,
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},
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};
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};
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static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
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static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
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@ -197,12 +204,36 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
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case RES_USAGE:
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case RES_USAGE:
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val = tcp_read_usage(memcg);
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val = tcp_read_usage(memcg);
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break;
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break;
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case RES_FAILCNT:
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val = tcp_read_stat(memcg, RES_FAILCNT, 0);
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break;
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default:
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default:
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BUG();
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BUG();
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}
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}
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return val;
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return val;
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}
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}
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static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event)
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{
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struct mem_cgroup *memcg;
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struct tcp_memcontrol *tcp;
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struct cg_proto *cg_proto;
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memcg = mem_cgroup_from_cont(cont);
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return 0;
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tcp = tcp_from_cgproto(cg_proto);
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switch (event) {
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case RES_FAILCNT:
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res_counter_reset_failcnt(&tcp->tcp_memory_allocated);
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break;
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}
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return 0;
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}
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unsigned long long tcp_max_memory(const struct mem_cgroup *memcg)
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unsigned long long tcp_max_memory(const struct mem_cgroup *memcg)
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{
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{
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struct tcp_memcontrol *tcp;
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struct tcp_memcontrol *tcp;
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