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Date:	Mon, 23 Aug 2010 20:53:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	sanagi.koki@...fujitsu.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kaneshige.kenji@...fujitsu.com, izumi.taku@...fujitsu.com,
	kosaki.motohiro@...fujitsu.com, nhorman@...driver.com,
	laijs@...fujitsu.com, scott.a.mcmillan@...el.com,
	rostedt@...dmis.org, eric.dumazet@...il.com, fweisbec@...il.com,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [PATCH v4 4/5] skb: add tracepoints to freeing skb

From: Koki Sanagi <sanagi.koki@...fujitsu.com>
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@...fujitsu.com>

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