• Koki Sanagi's avatar
    skb: Add tracepoints to freeing skb · 07dc22e7
    Koki Sanagi authored
    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: default avatarKoki Sanagi <sanagi.koki@jp.fujitsu.com>
    Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
    Acked-by: default avatarNeil Horman <nhorman@tuxdriver.com>
    Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
    Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
    Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
    Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Eric Dumazet <eric.dumazet@gmail.com>
    LKML-Reference: <4C724364.50903@jp.fujitsu.com>
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    07dc22e7
skbuff.c 75.2 KB