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authorEric Dumazet <eric.dumazet@gmail.com>2009-11-12 09:33:09 +0000
committerDavid S. Miller <davem@davemloft.net>2009-11-13 20:46:58 -0800
commit2c1409a0a2b88585ec0c03f1de0aafa178c56313 (patch)
treee9fc25badfb716e5368079535f548cc8e4b5576a /net/ipv4/inetpeer.c
parentipv6: speedup inet6_dump_addr() (diff)
downloadlinux-dev-2c1409a0a2b88585ec0c03f1de0aafa178c56313.tar.xz
linux-dev-2c1409a0a2b88585ec0c03f1de0aafa178c56313.zip
inetpeer: Optimize inet_getid()
While investigating for network latencies, I found inet_getid() was a contention point for some workloads, as inet_peer_idlock is shared by all inet_getid() users regardless of peers. One way to fix this is to make ip_id_count an atomic_t instead of __u16, and use atomic_add_return(). In order to keep sizeof(struct inet_peer) = 64 on 64bit arches tcp_ts_stamp is also converted to __u32 instead of "unsigned long". Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inetpeer.c')
-rw-r--r--net/ipv4/inetpeer.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index b1fbe18feb5a..6bcfe52a9c87 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -67,9 +67,6 @@
* ip_id_count: idlock
*/
-/* Exported for inet_getid inline function. */
-DEFINE_SPINLOCK(inet_peer_idlock);
-
static struct kmem_cache *peer_cachep __read_mostly;
#define node_height(x) x->avl_height
@@ -390,7 +387,7 @@ struct inet_peer *inet_getpeer(__be32 daddr, int create)
n->v4daddr = daddr;
atomic_set(&n->refcnt, 1);
atomic_set(&n->rid, 0);
- n->ip_id_count = secure_ip_id(daddr);
+ atomic_set(&n->ip_id_count, secure_ip_id(daddr));
n->tcp_ts_stamp = 0;
write_lock_bh(&peer_pool_lock);