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07dc22e729
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 <sanagi.koki@jp.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Neil 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: Frederic Weisbecker <fweisbec@gmail.com>
78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM skb
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#if !defined(_TRACE_SKB_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_SKB_H
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/tracepoint.h>
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/*
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* Tracepoint for free an sk_buff:
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*/
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TRACE_EVENT(kfree_skb,
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TP_PROTO(struct sk_buff *skb, void *location),
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TP_ARGS(skb, location),
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TP_STRUCT__entry(
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__field( void *, skbaddr )
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__field( unsigned short, protocol )
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__field( void *, location )
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),
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TP_fast_assign(
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__entry->skbaddr = skb;
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if (skb) {
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__entry->protocol = ntohs(skb->protocol);
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}
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__entry->location = location;
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),
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TP_printk("skbaddr=%p protocol=%u location=%p",
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__entry->skbaddr, __entry->protocol, __entry->location)
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);
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TRACE_EVENT(consume_skb,
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TP_PROTO(struct sk_buff *skb),
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TP_ARGS(skb),
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TP_STRUCT__entry(
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__field( void *, skbaddr )
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),
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TP_fast_assign(
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__entry->skbaddr = skb;
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),
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TP_printk("skbaddr=%p", __entry->skbaddr)
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);
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TRACE_EVENT(skb_copy_datagram_iovec,
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TP_PROTO(const struct sk_buff *skb, int len),
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TP_ARGS(skb, len),
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TP_STRUCT__entry(
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__field( const void *, skbaddr )
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__field( int, len )
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),
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TP_fast_assign(
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__entry->skbaddr = skb;
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__entry->len = len;
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),
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TP_printk("skbaddr=%p len=%d", __entry->skbaddr, __entry->len)
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);
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#endif /* _TRACE_SKB_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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