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pkt_sched: do not use rcu in tc_dump_qdisc()

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Like all rtnetlink dump operations, we hold RTNL in tc_dump_qdisc(),
so we do not need to use rcu protection to protect list of netdevices.

This will allow preemption to occur, thus reducing latencies.
Following patch adds explicit cond_resched() calls.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-03-10 17:11:42 -07:00 committed by David S. Miller
parent a19a7ec8fc
commit 15dc36ebbb
1 changed files with 2 additions and 4 deletions
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6
net/sched/sch_api.c
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@ -1434,9 +1434,9 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
s_idx = cb->args[0];
s_q_idx = q_idx = cb->args[1];
rcu_read_lock();
idx = 0;
for_each_netdev_rcu(net, dev) {
ASSERT_RTNL();
for_each_netdev(net, dev) {
struct netdev_queue *dev_queue;
if (idx < s_idx)
@ -1459,8 +1459,6 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
}
done:
rcu_read_unlock();
cb->args[0] = idx;
cb->args[1] = q_idx;