From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v4 4/5] skb: add tracepoints to freeing skb Date: Mon, 23 Aug 2010 20:53:06 -0700 (PDT) Message-ID: <20100823.205306.133908715.davem@davemloft.net> References: <4C72422C.5070102@jp.fujitsu.com> <4C724364.50903@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kaneshige.kenji@jp.fujitsu.com, izumi.taku@jp.fujitsu.com, kosaki.motohiro@jp.fujitsu.com, nhorman@tuxdriver.com, laijs@cn.fujitsu.com, scott.a.mcmillan@intel.com, rostedt@goodmis.org, eric.dumazet@gmail.com, fweisbec@gmail.com, mathieu.desnoyers@polymtl.ca To: sanagi.koki@jp.fujitsu.com Return-path: In-Reply-To: <4C724364.50903@jp.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Koki Sanagi 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 Acked-by: David S. Miller