netdev - [next-next PATCH 5/7] fib_trie: Use empty_children instead of counting empty nodes in stats collection

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Date:	Thu, 22 Jan 2015 15:51:33 -0800
From:	Alexander Duyck <alexander.h.duyck@...hat.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net
Subject: [next-next PATCH 5/7] fib_trie: Use empty_children instead of
 counting empty nodes in stats collection

It doesn't make much sense to count the pointers ourselves when
empty_children already has a count for the number of NULL pointers stored
in the tnode.  As such save ourselves the cycles and just use
empty_children.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...hat.com>
---
 net/ipv4/fib_trie.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index f874e18..90654bb 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1954,16 +1954,10 @@ static void trie_collect_stats(struct trie *t, struct trie_stat *s)
 			hlist_for_each_entry_rcu(li, &n->list, hlist)
 				++s->prefixes;
 		} else {
-			unsigned long i;
-
 			s->tnodes++;
 			if (n->bits < MAX_STAT_DEPTH)
 				s->nodesizes[n->bits]++;
-
-			for (i = tnode_child_length(n); i--;) {
-				if (!rcu_access_pointer(n->child[i]))
-					s->nullpointers++;
-			}
+			s->nullpointers += n->empty_children;
 		}
 	}
 	rcu_read_unlock();

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