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authorEric Dumazet <eric.dumazet@gmail.com>2010-11-15 19:58:26 +0000
committerDavid S. Miller <davem@davemloft.net>2010-11-16 11:17:43 -0800
commitc31504dc0d1dc853dcee509d9999169a9097a717 (patch)
tree8ee1d5616b7140759cf742ef89cf9f7ba1c01b20 /net/ipv4/udp.c
parent213b15ca818adf7766cd7162c2159a6ecdd3bab8 (diff)
udp: use atomic_inc_not_zero_hint
UDP sockets refcount is usually 2, unless an incoming frame is going to be queued in receive or backlog queue. Using atomic_inc_not_zero_hint() permits to reduce latency, because processor issues less memory transactions. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5e0a3a582a5..491ecd3f7a0 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -430,7 +430,7 @@ begin:
if (result) {
exact_match:
- if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
+ if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
result = NULL;
else if (unlikely(compute_score2(result, net, saddr, sport,
daddr, hnum, dif) < badness)) {
@@ -500,7 +500,7 @@ begin:
goto begin;
if (result) {
- if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
+ if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
result = NULL;
else if (unlikely(compute_score(result, net, saddr, hnum, sport,
daddr, dport, dif) < badness)) {