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35 lines
1023 B
Diff
35 lines
1023 B
Diff
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From: Alexander Duyck <alexander.h.duyck@redhat.com>
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Date: Thu, 22 Jan 2015 15:51:33 -0800
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Subject: [PATCH] fib_trie: Use empty_children instead of counting empty nodes
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in stats collection
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It doesn't make much sense to count the pointers ourselves when
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empty_children already has a count for the number of NULL pointers stored
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in the tnode. As such save ourselves the cycles and just use
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empty_children.
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Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/net/ipv4/fib_trie.c
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+++ b/net/ipv4/fib_trie.c
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@@ -1954,16 +1954,10 @@ static void trie_collect_stats(struct tr
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hlist_for_each_entry_rcu(li, &n->list, hlist)
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++s->prefixes;
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} else {
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- unsigned long i;
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-
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s->tnodes++;
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if (n->bits < MAX_STAT_DEPTH)
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s->nodesizes[n->bits]++;
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-
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- for (i = tnode_child_length(n); i--;) {
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- if (!rcu_access_pointer(n->child[i]))
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- s->nullpointers++;
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- }
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+ s->nullpointers += n->empty_children;
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}
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}
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rcu_read_unlock();
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