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| author |   Eric Dumazet <dada1@cosmosbay.com> | 2008-11-25 21:16:35 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2008-11-25 21:16:35 -0800 |
| commit | 1748376b6626acf59c24e9592ac67b3fe2a0e026 (patch) | |
| tree | 65a28205daf1ca92e31389440764fc407365014e /net/ipv4/tcp.c | |
| parent | tc: policing requires a rate estimator (diff) | |
| download | linux-dev-1748376b6626acf59c24e9592ac67b3fe2a0e026.tar.xz linux-dev-1748376b6626acf59c24e9592ac67b3fe2a0e026.zip | |
net: Use a percpu_counter for sockets_allocated
Instead of using one atomic_t per protocol, use a percpu_counter
for "sockets_allocated", to reduce cache line contention on
heavy duty network servers.
Note : We revert commit (248969ae31e1b3276fc4399d67ce29a5d81e6fd9
net: af_unix can make unix_nr_socks visbile in /proc),
since it is not anymore used after sock_prot_inuse_add() addition
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 044224a341eb..e6fade9ebf62 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -290,9 +290,12 @@ EXPORT_SYMBOL(sysctl_tcp_rmem); EXPORT_SYMBOL(sysctl_tcp_wmem); atomic_t tcp_memory_allocated; /* Current allocated memory. */ -atomic_t tcp_sockets_allocated; /* Current number of TCP sockets. */ - EXPORT_SYMBOL(tcp_memory_allocated); + +/* + * Current number of TCP sockets. + */ +struct percpu_counter tcp_sockets_allocated; EXPORT_SYMBOL(tcp_sockets_allocated); /* @@ -2685,6 +2688,7 @@ void __init tcp_init(void) BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb)); + percpu_counter_init(&tcp_sockets_allocated, 0); tcp_hashinfo.bind_bucket_cachep = kmem_cache_create("tcp_bind_bucket", sizeof(struct inet_bind_bucket), 0, |