Re: [PATCH v4 4/5] skb: add tracepoints to freeing skb

[David Miller]

From: Koki Sanagi <sanagi.koki@xxxxxxxxxxxxxx>
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 <sanagi.koki@xxxxxxxxxxxxxx>

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