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authorJohannes Weiner <hannes@cmpxchg.org>2016-01-14 15:21:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-14 16:00:49 -0800
commitaf95d7df4059cfeab7e7c244f3564214aada7dad (patch)
tree137a733624782b600d61c0f2d995182f0c8d7dfa
parent3d596f7b907b0281b997cf30c92994a71ad0a1a9 (diff)
net: tcp_memcontrol: remove dead per-memcg count of allocated sockets
The number of allocated sockets is used for calculations in the soft limit phase, where packets are accepted but the socket is under memory pressure. Since there is no soft limit phase in tcp_memcontrol, and memory pressure is only entered when packets are already dropped, this is actually dead code. Remove it. As this is the last user of parent_cg_proto(), remove that too. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/memcontrol.h1
-rw-r--r--include/net/sock.h39
-rw-r--r--net/ipv4/tcp_memcontrol.c3
3 files changed, 3 insertions, 40 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 85c437b0cbc0..15acc04ebdd3 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -87,7 +87,6 @@ enum mem_cgroup_events_target {
struct cg_proto {
struct page_counter memory_allocated; /* Current allocated memory. */
- struct percpu_counter sockets_allocated; /* Current number of sockets. */
int memory_pressure;
bool active;
long sysctl_mem[3];
diff --git a/include/net/sock.h b/include/net/sock.h
index d3b035c7362b..1f15937ec208 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1098,19 +1098,9 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_NET)
extern struct static_key memcg_socket_limit_enabled;
-static inline struct cg_proto *parent_cg_proto(struct proto *proto,
- struct cg_proto *cg_proto)
-{
- return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg));
-}
#define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled)
#else
#define mem_cgroup_sockets_enabled 0
-static inline struct cg_proto *parent_cg_proto(struct proto *proto,
- struct cg_proto *cg_proto)
-{
- return NULL;
-}
#endif
static inline bool sk_stream_memory_free(const struct sock *sk)
@@ -1236,41 +1226,18 @@ sk_memory_allocated_sub(struct sock *sk, int amt)
static inline void sk_sockets_allocated_dec(struct sock *sk)
{
- struct proto *prot = sk->sk_prot;
-
- if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
- struct cg_proto *cg_proto = sk->sk_cgrp;
-
- for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
- percpu_counter_dec(&cg_proto->sockets_allocated);
- }
-
- percpu_counter_dec(prot->sockets_allocated);
+ percpu_counter_dec(sk->sk_prot->sockets_allocated);
}
static inline void sk_sockets_allocated_inc(struct sock *sk)
{
- struct proto *prot = sk->sk_prot;
-
- if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
- struct cg_proto *cg_proto = sk->sk_cgrp;
-
- for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
- percpu_counter_inc(&cg_proto->sockets_allocated);
- }
-
- percpu_counter_inc(prot->sockets_allocated);
+ percpu_counter_inc(sk->sk_prot->sockets_allocated);
}
static inline int
sk_sockets_allocated_read_positive(struct sock *sk)
{
- struct proto *prot = sk->sk_prot;
-
- if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
- return percpu_counter_read_positive(&sk->sk_cgrp->sockets_allocated);
-
- return percpu_counter_read_positive(prot->sockets_allocated);
+ return percpu_counter_read_positive(sk->sk_prot->sockets_allocated);
}
static inline int
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index d07579ada001..6759e0d6bba1 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -32,7 +32,6 @@ int tcp_init_cgroup(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
counter_parent = &parent_cg->memory_allocated;
page_counter_init(&cg_proto->memory_allocated, counter_parent);
- percpu_counter_init(&cg_proto->sockets_allocated, 0, GFP_KERNEL);
return 0;
}
@@ -46,8 +45,6 @@ void tcp_destroy_cgroup(struct mem_cgroup *memcg)
if (!cg_proto)
return;
- percpu_counter_destroy(&cg_proto->sockets_allocated);
-
if (cg_proto->active)
static_key_slow_dec(&memcg_socket_limit_enabled);