Commit ffea59e5 authored by Glauber Costa's avatar Glauber Costa Committed by David S. Miller
Browse files

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: default avatarGlauber Costa <glommer@parallels.com>
Reviewed-by: default avatarHiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: David S. Miller <davem@davemloft.net>
CC: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5a6dd343

net/ipv4/tcp_memcontrol.c

+31 −0
Original line number Diff line number Diff line
@@ -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;

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