skb: Add tracepoints to freeing skb

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 transmitted packets. And using it, we can
calculate how many packets driver had at that time. It is useful when
a drop of transmitted packet is a problem.

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

Signed-off-by: Koki Sanagi <[email protected]>
Acked-by: David S. Miller <[email protected]>
Acked-by: Neil Horman <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Kaneshige Kenji <[email protected]>
Cc: Izumo Taku <[email protected]>
Cc: Kosaki Motohiro <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Scott Mcmillan <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Eric Dumazet <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>

0 files changed, 0 insertions, 0 deletions