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tcp memory pressure controls

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This patch introduces memory pressure controls for the tcp
protocol. It uses the generic socket memory pressure code
introduced in earlier patches, and fills in the
necessary data in cg_proto struct.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com>
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 21:47:04 +00:00
committed by David S. Miller
parent e1aab161e0
commit d1a4c0b37c
10 changed files with 189 additions and 5 deletions
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74
net/ipv4/tcp_memcontrol.c Normal file
View File

@@ -0,0 +1,74 @@
#include <net/tcp.h>
#include <net/tcp_memcontrol.h>
#include <net/sock.h>
#include <linux/memcontrol.h>
#include <linux/module.h>
static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
{
return container_of(cg_proto, struct tcp_memcontrol, cg_proto);
}
static void memcg_tcp_enter_memory_pressure(struct sock *sk)
{
if (!sk->sk_cgrp->memory_pressure)
*sk->sk_cgrp->memory_pressure = 1;
}
EXPORT_SYMBOL(memcg_tcp_enter_memory_pressure);
int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
{
/*
* The root cgroup does not use res_counters, but rather,
* rely on the data already collected by the network
* subsystem
*/
struct res_counter *res_parent = NULL;
struct cg_proto *cg_proto, *parent_cg;
struct tcp_memcontrol *tcp;
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct mem_cgroup *parent = parent_mem_cgroup(memcg);
cg_proto = tcp_prot.proto_cgroup(memcg);
if (!cg_proto)
return 0;
tcp = tcp_from_cgproto(cg_proto);
tcp->tcp_prot_mem[0] = sysctl_tcp_mem[0];
tcp->tcp_prot_mem[1] = sysctl_tcp_mem[1];
tcp->tcp_prot_mem[2] = sysctl_tcp_mem[2];
tcp->tcp_memory_pressure = 0;
parent_cg = tcp_prot.proto_cgroup(parent);
if (parent_cg)
res_parent = parent_cg->memory_allocated;
res_counter_init(&tcp->tcp_memory_allocated, res_parent);
percpu_counter_init(&tcp->tcp_sockets_allocated, 0);
cg_proto->enter_memory_pressure = memcg_tcp_enter_memory_pressure;
cg_proto->memory_pressure = &tcp->tcp_memory_pressure;
cg_proto->sysctl_mem = tcp->tcp_prot_mem;
cg_proto->memory_allocated = &tcp->tcp_memory_allocated;
cg_proto->sockets_allocated = &tcp->tcp_sockets_allocated;
cg_proto->memcg = memcg;
return 0;
}
EXPORT_SYMBOL(tcp_init_cgroup);
void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct cg_proto *cg_proto;
struct tcp_memcontrol *tcp;
cg_proto = tcp_prot.proto_cgroup(memcg);
if (!cg_proto)
return;
tcp = tcp_from_cgproto(cg_proto);
percpu_counter_destroy(&tcp->tcp_sockets_allocated);
}
EXPORT_SYMBOL(tcp_destroy_cgroup);