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| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-11-20 00:40:07 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-20 00:40:07 -0800 |
| commit | 5caea4ea7088e80ac5410d04660346094608b909 (patch) | |
| tree | fad95133683c002d24ff5de7fb756dad806b41ed /net/ipv6/inet6_hashtables.c | |
| parent | d8b83c57a7e497cba9b5cb156e63176323035785 (diff) | |
| download | linux-5caea4ea7088e80ac5410d04660346094608b909.tar.gz linux-5caea4ea7088e80ac5410d04660346094608b909.tar.bz2 linux-5caea4ea7088e80ac5410d04660346094608b909.zip | |
net: listening_hash get a spinlock per bucket
This patch prepares RCU migration of listening_hash table for
TCP/DCCP protocols.
listening_hash table being small (32 slots per protocol), we add
a spinlock for each slot, instead of a single rwlock for whole table.
This should reduce hold time of readers, and writers concurrency.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/inet6_hashtables.c')
| -rw-r--r-- | net/ipv6/inet6_hashtables.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c index c1b4d401fd95..21544b9be259 100644 --- a/net/ipv6/inet6_hashtables.c +++ b/net/ipv6/inet6_hashtables.c @@ -25,30 +25,30 @@ void __inet6_hash(struct sock *sk) { struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; - rwlock_t *lock; WARN_ON(!sk_unhashed(sk)); if (sk->sk_state == TCP_LISTEN) { - struct hlist_head *list; + struct inet_listen_hashbucket *ilb; - list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; - lock = &hashinfo->lhash_lock; - inet_listen_wlock(hashinfo); - __sk_add_node(sk, list); + ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; + spin_lock(&ilb->lock); + __sk_add_node(sk, &ilb->head); + spin_unlock(&ilb->lock); } else { unsigned int hash; struct hlist_nulls_head *list; + rwlock_t *lock; sk->sk_hash = hash = inet6_sk_ehashfn(sk); list = &inet_ehash_bucket(hashinfo, hash)->chain; lock = inet_ehash_lockp(hashinfo, hash); write_lock(lock); __sk_nulls_add_node_rcu(sk, list); + write_unlock(lock); } sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); - write_unlock(lock); } EXPORT_SYMBOL(__inet6_hash); @@ -126,10 +126,11 @@ struct sock *inet6_lookup_listener(struct net *net, const struct hlist_node *node; struct sock *result = NULL; int score, hiscore = 0; + struct inet_listen_hashbucket *ilb; - read_lock(&hashinfo->lhash_lock); - sk_for_each(sk, node, - &hashinfo->listening_hash[inet_lhashfn(net, hnum)]) { + ilb = &hashinfo->listening_hash[inet_lhashfn(net, hnum)]; + spin_lock(&ilb->lock); + sk_for_each(sk, node, &ilb->head) { if (net_eq(sock_net(sk), net) && inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) { const struct ipv6_pinfo *np = inet6_sk(sk); @@ -157,7 +158,7 @@ struct sock *inet6_lookup_listener(struct net *net, } if (result) sock_hold(result); - read_unlock(&hashinfo->lhash_lock); + spin_unlock(&ilb->lock); return result; } |