netdev - [PATCH 13/16] ipv4: Dirty less cache lines in route caching paths.

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Date:	Thu, 19 Jul 2012 14:36:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH 13/16] ipv4: Dirty less cache lines in route caching paths.


Don't bother incrementing dst->__use and setting dst->lastuse,
they are completely pointless and just slow things down.

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/ipv4/route.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index e5384f1..1d4e317 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1437,7 +1437,7 @@ static int __mkroute_input(struct sk_buff *skb,
 		if (!(flags & RTCF_DIRECTSRC) && !itag) {
 			rth = FIB_RES_NH(*res).nh_rth_input;
 			if (rt_cache_valid(rth)) {
-				dst_use(&rth->dst, jiffies);
+				dst_hold(&rth->dst);
 				goto out;
 			}
 			do_cache = true;
@@ -1613,7 +1613,7 @@ local_input:
 		if (!(flags & RTCF_DIRECTSRC) && !itag) {
 			rth = FIB_RES_NH(res).nh_rth_input;
 			if (rt_cache_valid(rth)) {
-				dst_use(&rth->dst, jiffies);
+				dst_hold(&rth->dst);
 				goto set_and_out;
 			}
 			do_cache = true;
@@ -1783,7 +1783,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 		if (!fnhe) {
 			rth = FIB_RES_NH(*res).nh_rth_output;
 			if (rt_cache_valid(rth)) {
-				dst_use(&rth->dst, jiffies);
+				dst_hold(&rth->dst);
 				return rth;
 			}
 		}
-- 
1.7.10.4

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