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| author |   Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-20 22:03:38 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2010-10-21 03:09:41 -0700 |
| commit | 9b0c290e78d667e6a483bde8c7cef7dd15f49017 (patch) | |
| tree | ed68f6cbcc9a512106217694b16a846147cdf54a /net/ipv4/fib_trie.c | |
| parent | net/sched: fix missing spinlock init (diff) | |
| download | linux-dev-9b0c290e78d667e6a483bde8c7cef7dd15f49017.tar.xz linux-dev-9b0c290e78d667e6a483bde8c7cef7dd15f49017.zip | |
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.c | 3 |
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) |