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net: move bsockets outside of read only beginning of struct inet_hashinfo 

And switch bsockets to atomic_t since it might be changed in parallel.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-02-01 12:31:33 -08:00 committed by David S. Miller
parent 5add300975
commit 24dd1fa184
3 changed files with 6 additions and 4 deletions
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3
include/net/inet_hashtables.h
View File

@ -134,7 +134,7 @@ struct inet_hashinfo {
struct inet_bind_hashbucket *bhash;
unsigned int bhash_size;
int bsockets;
/* 4 bytes hole on 64 bit */
struct kmem_cache *bind_bucket_cachep;
@ -151,6 +151,7 @@ struct inet_hashinfo {
struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
____cacheline_aligned_in_smp;
atomic_t bsockets;
};
static inline struct inet_ehash_bucket *inet_ehash_bucket(

2
net/ipv4/inet_connection_sock.c
View File

@ -119,7 +119,7 @@ again:
(tb->num_owners < smallest_size || smallest_size == -1)) {
smallest_size = tb->num_owners;
smallest_rover = rover;
if (hashinfo->bsockets > (high - low) + 1) {
if (atomic_read(&hashinfo->bsockets) > (high - low) + 1) {
spin_unlock(&head->lock);
snum = smallest_rover;
goto have_snum;

5
net/ipv4/inet_hashtables.c
View File

@ -62,7 +62,7 @@ void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
hashinfo->bsockets++;
atomic_inc(&hashinfo->bsockets);
inet_sk(sk)->num = snum;
sk_add_bind_node(sk, &tb->owners);
@ -81,7 +81,7 @@ static void __inet_put_port(struct sock *sk)
struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
struct inet_bind_bucket *tb;
hashinfo->bsockets--;
atomic_dec(&hashinfo->bsockets);
spin_lock(&head->lock);
tb = inet_csk(sk)->icsk_bind_hash;
@ -532,6 +532,7 @@ void inet_hashinfo_init(struct inet_hashinfo *h)
{
int i;
atomic_set(&h->bsockets, 0);
for (i = 0; i < INET_LHTABLE_SIZE; i++) {
spin_lock_init(&h->listening_hash[i].lock);
INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head,