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>
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@ -79,6 +79,7 @@ Brief summary of control files.
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memory.independent_kmem_limit # select whether or not kernel memory limits are
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memory.independent_kmem_limit # select whether or not kernel memory limits are
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independent of user limits
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independent of user limits
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memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory
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memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory
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memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation
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1. History
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1. History
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@ -17,6 +17,11 @@ 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_LIMIT,
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.private = RES_LIMIT,
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},
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},
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{
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.name = "kmem.tcp.usage_in_bytes",
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.read_u64 = tcp_cgroup_read,
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.private = RES_USAGE,
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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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@ -167,6 +172,19 @@ static u64 tcp_read_stat(struct mem_cgroup *memcg, int type, u64 default_val)
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return res_counter_read_u64(&tcp->tcp_memory_allocated, type);
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return res_counter_read_u64(&tcp->tcp_memory_allocated, type);
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}
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}
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static u64 tcp_read_usage(struct mem_cgroup *memcg)
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{
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struct tcp_memcontrol *tcp;
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struct cg_proto *cg_proto;
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT;
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tcp = tcp_from_cgproto(cg_proto);
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return res_counter_read_u64(&tcp->tcp_memory_allocated, RES_USAGE);
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}
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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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{
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{
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struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
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struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
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@ -176,6 +194,9 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft)
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case RES_LIMIT:
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case RES_LIMIT:
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val = tcp_read_stat(memcg, RES_LIMIT, RESOURCE_MAX);
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val = tcp_read_stat(memcg, RES_LIMIT, RESOURCE_MAX);
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break;
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break;
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case RES_USAGE:
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val = tcp_read_usage(memcg);
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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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