diff options
Diffstat (limited to 'target/linux/generic/patches-3.18/080-23-fib_trie-Use-empty_children-instead-of-counting-empt.patch')
| -rw-r--r-- | target/linux/generic/patches-3.18/080-23-fib_trie-Use-empty_children-instead-of-counting-empt.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.18/080-23-fib_trie-Use-empty_children-instead-of-counting-empt.patch b/target/linux/generic/patches-3.18/080-23-fib_trie-Use-empty_children-instead-of-counting-empt.patch new file mode 100644 index 0000000..160fbe1 --- /dev/null +++ b/target/linux/generic/patches-3.18/080-23-fib_trie-Use-empty_children-instead-of-counting-empt.patch @@ -0,0 +1,34 @@ +From: Alexander Duyck <alexander.h.duyck@redhat.com> +Date: Thu, 22 Jan 2015 15:51:33 -0800 +Subject: [PATCH] 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@redhat.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + +--- a/net/ipv4/fib_trie.c ++++ b/net/ipv4/fib_trie.c +@@ -1954,16 +1954,10 @@ static void trie_collect_stats(struct tr + 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(); |