diff options
| author |   Eric Dumazet <dada1@cosmosbay.com> | 2007-03-27 13:58:31 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:28:19 -0700 |
| commit | 4103f8cd5c1f260d674a7b426ed221812de54d47 (patch) | |
| tree | 28649757907dd77b53a8c16533c963c43fea4be0 | |
| parent | [NET] fib_rules: Flush route cache after rule modifications (diff) | |
| download | linux-dev-4103f8cd5c1f260d674a7b426ed221812de54d47.tar.xz linux-dev-4103f8cd5c1f260d674a7b426ed221812de54d47.zip | |
[TCP]: tcp_memory_pressure and tcp_socket are__read_mostly candidates
tcp_memory_pressure and tcp_socket currently share a cache line with tcp_memory_allocated, tcp_sockets_allocated.
(Very hot cache line)
It makes sense to declare these variables as __read_mostly, to avoid false sharing on SMP.
ffffffff8081d9c0 B tcp_orphan_count
ffffffff8081d9c4 B tcp_memory_allocated
ffffffff8081d9c8 B tcp_sockets_allocated
ffffffff8081d9cc B tcp_memory_pressure
ffffffff8081d9d0 b tcp_md5sig_users
ffffffff8081d9d8 b tcp_md5sig_pool
ffffffff8081d9e0 b warntime.31570
ffffffff8081d9e8 b tcp_socket
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp.c | 2 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 18a09a78ca0b..bb9d91a7662f 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -297,7 +297,7 @@ EXPORT_SYMBOL(tcp_sockets_allocated); * All the sk_stream_mem_schedule() is of this nature: accounting * is strict, actions are advisory and have some latency. */ -int tcp_memory_pressure; +int tcp_memory_pressure __read_mostly; EXPORT_SYMBOL(tcp_memory_pressure); diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 617a5e4ca010..e11eaf4cc269 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -88,7 +88,7 @@ int sysctl_tcp_low_latency __read_mostly; #define ICMP_MIN_LENGTH 8 /* Socket used for sending RSTs */ -static struct socket *tcp_socket; +static struct socket *tcp_socket __read_mostly; void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); |