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fib: introduce fib_alias_accessed() helper

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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>
This commit is contained in:
Eric Dumazet
2010-10-20 22:03:38 +00:00
committed by David S. Miller
parent 7b5edbc4cf
commit 9b0c290e78
4 changed files with 12 additions and 3 deletions
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2
net/ipv4/fib_semantics.c
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@@ -901,7 +901,7 @@ int fib_semantic_match(struct list_head *head, const struct flowi *flp,
if (fa->fa_scope < flp->fl4_scope)
continue;
fa->fa_state |= FA_S_ACCESSED;
fib_alias_accessed(fa);
err = fib_props[fa->fa_type].error;
if (err == 0) {