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Subject[RFC PATCH v4 2/5] napi: convert trace_napi_poll to TRACE_EVENT
From: Neil Horman <nhorman@tuxdriver.com>

This patch converts trace_napi_poll from DECLARE_EVENT to TRACE_EVENT to improve
the usability of napi_poll tracepoint.

<idle>-0 [001] 241302.750777: napi_poll: napi poll on napi struct f6acc480 for device eth3
<idle>-0 [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d70c for device eth1

An original patch is below.
http://marc.info/?l=linux-kernel&m=126021713809450&w=2
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

And add a fix by Steven Rostedt.
http://marc.info/?l=linux-kernel&m=126150506519173&w=2

Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
---
include/trace/events/napi.h | 25 +++++++++++++++++++++++--
1 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/include/trace/events/napi.h b/include/trace/events/napi.h
index 188deca..8fe1e93 100644
--- a/include/trace/events/napi.h
+++ b/include/trace/events/napi.h
@@ -6,10 +6,31 @@

#include <linux/netdevice.h>
#include <linux/tracepoint.h>
+#include <linux/ftrace.h>
+
+#define NO_DEV "(no_device)"
+
+TRACE_EVENT(napi_poll,

-DECLARE_TRACE(napi_poll,
TP_PROTO(struct napi_struct *napi),
- TP_ARGS(napi));
+
+ TP_ARGS(napi),
+
+ TP_STRUCT__entry(
+ __field( struct napi_struct *, napi)
+ __string( dev_name, napi->dev ? napi->dev->name : NO_DEV)
+ ),
+
+ TP_fast_assign(
+ __entry->napi = napi;
+ __assign_str(dev_name, napi->dev ? napi->dev->name : NO_DEV);
+ ),
+
+ TP_printk("napi poll on napi struct %p for device %s",
+ __entry->napi, __get_str(dev_name))
+);
+
+#undef NO_DEV

#endif /* _TRACE_NAPI_H_ */



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