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Message-Id: <1335939762-1912-16-git-send-email-horms@verge.net.au>
Date: Wed, 2 May 2012 15:22:39 +0900
From: Simon Horman <horms@...ge.net.au>
To: Pablo Neira Ayuso <pablo@...filter.org>
Cc: lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
netfilter-devel@...r.kernel.org,
Wensong Zhang <wensong@...ux-vs.org>,
Julian Anastasov <ja@....bg>,
Hans Schillstrom <hans.schillstrom@...csson.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Simon Horman <horms@...ge.net.au>
Subject: [PATCH 15/18] ipvs: optimize the use of flags in ip_vs_bind_dest
From: Julian Anastasov <ja@....bg>
cp->flags is marked volatile but ip_vs_bind_dest
can safely modify the flags, so save some CPU cycles by
using temp variable.
Signed-off-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
net/netfilter/ipvs/ip_vs_conn.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index 6a43c93..7f21b91 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -548,6 +548,7 @@ static inline void
ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
{
unsigned int conn_flags;
+ __u32 flags;
/* if dest is NULL, then return directly */
if (!dest)
@@ -559,17 +560,19 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
conn_flags = atomic_read(&dest->conn_flags);
if (cp->protocol != IPPROTO_UDP)
conn_flags &= ~IP_VS_CONN_F_ONE_PACKET;
+ flags = cp->flags;
/* Bind with the destination and its corresponding transmitter */
- if (cp->flags & IP_VS_CONN_F_SYNC) {
+ if (flags & IP_VS_CONN_F_SYNC) {
/* if the connection is not template and is created
* by sync, preserve the activity flag.
*/
- if (!(cp->flags & IP_VS_CONN_F_TEMPLATE))
+ if (!(flags & IP_VS_CONN_F_TEMPLATE))
conn_flags &= ~IP_VS_CONN_F_INACTIVE;
/* connections inherit forwarding method from dest */
- cp->flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT);
+ flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT);
}
- cp->flags |= conn_flags;
+ flags |= conn_flags;
+ cp->flags = flags;
cp->dest = dest;
IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
@@ -584,11 +587,11 @@ ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
atomic_read(&dest->refcnt));
/* Update the connection counters */
- if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
+ if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
/* It is a normal connection, so modify the counters
* according to the flags, later the protocol can
* update them on state change */
- if (!(cp->flags & IP_VS_CONN_F_INACTIVE))
+ if (!(flags & IP_VS_CONN_F_INACTIVE))
atomic_inc(&dest->activeconns);
else
atomic_inc(&dest->inactconns);
--
1.7.10
--
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