net: skb ftracer - add tracepoint to skb_copy_datagram_iovec (v3)
skb allocation / cosumption tracer - Add consumption tracepoint
This patch adds a tracepoint to skb_copy_datagram_iovec, which is called each
time a userspace process copies a frame from a socket receive queue to a user
space buffer. It allows us to hook in and examine each sk_buff that the system
receives on a per-socket bases, and can be use to compile a list of which skb's
were received by which processes.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
include/trace/events/skb.h | 20 ++++++++++++++++++++
net/core/datagram.c | 3 +++
2 files changed, 23 insertions(+)
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index e499863b..4b2be6d 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -5,6 +5,7 @@
#define _TRACE_SKB_H
#include <linux/skbuff.h>
+#include <linux/netdevice.h>
#include <linux/tracepoint.h>
/*
@@ -34,6 +35,25 @@
__entry->skbaddr, __entry->protocol, __entry->location)
);
+TRACE_EVENT(skb_copy_datagram_iovec,
+
+ TP_PROTO(const struct sk_buff *skb, int len),
+
+ TP_ARGS(skb, len),
+
+ TP_STRUCT__entry(
+ __field( const void *, skbaddr )
+ __field( int, len )
+ ),
+
+ TP_fast_assign(
+ __entry->skbaddr = skb;
+ __entry->len = len;
+ ),
+
+ TP_printk("skbaddr=%p len=%d", __entry->skbaddr, __entry->len)
+);
+
#endif /* _TRACE_SKB_H */
/* This part must be outside protection */