mirror of
https://github.com/torvalds/linux
synced 2024-09-20 11:07:02 +00:00
3dc43e3e4d
This patch allows each namespace to independently set up its levels for tcp memory pressure thresholds. This patch alone does not buy much: we need to make this values per group of process somehow. This is achieved in the patches that follows in this patchset. Signed-off-by: Glauber Costa <glommer@parallels.com> Reviewed-by: KAMEZAWA Hiroyuki <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>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
#include <net/tcp.h>
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#include <net/tcp_memcontrol.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <linux/nsproxy.h>
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#include <linux/memcontrol.h>
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#include <linux/module.h>
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static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
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{
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return container_of(cg_proto, struct tcp_memcontrol, cg_proto);
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}
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static void memcg_tcp_enter_memory_pressure(struct sock *sk)
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{
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if (!sk->sk_cgrp->memory_pressure)
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*sk->sk_cgrp->memory_pressure = 1;
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}
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EXPORT_SYMBOL(memcg_tcp_enter_memory_pressure);
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int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
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{
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/*
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* The root cgroup does not use res_counters, but rather,
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* rely on the data already collected by the network
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* subsystem
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*/
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struct res_counter *res_parent = NULL;
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struct cg_proto *cg_proto, *parent_cg;
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struct tcp_memcontrol *tcp;
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struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
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struct mem_cgroup *parent = parent_mem_cgroup(memcg);
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struct net *net = current->nsproxy->net_ns;
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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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tcp->tcp_prot_mem[0] = net->ipv4.sysctl_tcp_mem[0];
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tcp->tcp_prot_mem[1] = net->ipv4.sysctl_tcp_mem[1];
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tcp->tcp_prot_mem[2] = net->ipv4.sysctl_tcp_mem[2];
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tcp->tcp_memory_pressure = 0;
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parent_cg = tcp_prot.proto_cgroup(parent);
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if (parent_cg)
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res_parent = parent_cg->memory_allocated;
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res_counter_init(&tcp->tcp_memory_allocated, res_parent);
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percpu_counter_init(&tcp->tcp_sockets_allocated, 0);
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cg_proto->enter_memory_pressure = memcg_tcp_enter_memory_pressure;
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cg_proto->memory_pressure = &tcp->tcp_memory_pressure;
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cg_proto->sysctl_mem = tcp->tcp_prot_mem;
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cg_proto->memory_allocated = &tcp->tcp_memory_allocated;
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cg_proto->sockets_allocated = &tcp->tcp_sockets_allocated;
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cg_proto->memcg = memcg;
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return 0;
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}
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EXPORT_SYMBOL(tcp_init_cgroup);
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void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
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{
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struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
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struct cg_proto *cg_proto;
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struct tcp_memcontrol *tcp;
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return;
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tcp = tcp_from_cgproto(cg_proto);
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percpu_counter_destroy(&tcp->tcp_sockets_allocated);
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}
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EXPORT_SYMBOL(tcp_destroy_cgroup);
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