From: Koki Sanagi <redacted>
Date: Mon, 23 Aug 2010 18:46:12 +0900

This patch adds tracepoint to consume_skb and add trace_kfree_skb before
__kfree_skb in skb_free_datagram_locked and net_tx_action.
Combinating with tracepoint on dev_hard_start_xmit, we can check how long it
takes to free transmited packets. And using it, we can calculate how many
packets driver had at that time. It is useful when a drop of transmited packet
is a problem.

            sshd-6828  [000] 112689.258154: consume_skb: skbaddr=f2d99bb8

Signed-off-by: Koki Sanagi <redacted>

Acked-by: David S. Miller <davem@davemloft.net>