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authorEric Dumazet <eric.dumazet@gmail.com>2010-10-20 22:03:38 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-21 03:09:41 -0700
commit9b0c290e78d667e6a483bde8c7cef7dd15f49017 (patch)
treeed68f6cbcc9a512106217694b16a846147cdf54a /net/ipv4/fib_trie.c
parent7b5edbc4cfe2297b0915adea5aa1eafcafadbf06 (diff)
fib: introduce fib_alias_accessed() helper
Perf tools session at NFWS 2010 pointed out a false sharing on struct fib_alias that can be avoided pretty easily, if we set FA_S_ACCESSED bit only if needed (ie : not already set) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_trie.c')
-rw-r--r--net/ipv4/fib_trie.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 31494f335686..cd5e13aee7d5 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1838,7 +1838,8 @@ void fib_table_select_default(struct fib_table *tb,
if (!next_fi->fib_nh[0].nh_gw ||
next_fi->fib_nh[0].nh_scope != RT_SCOPE_LINK)
continue;
- fa->fa_state |= FA_S_ACCESSED;
+
+ fib_alias_accessed(fa);
if (fi == NULL) {
if (next_fi != res->fi)