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Message-ID: <49F548D0.9030500@cn.fujitsu.com>
Date: Mon, 27 Apr 2009 13:55:28 +0800
From: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To: mingo@...e.hu, mathieu.desnoyers@...ymtl.ca, fweisbec@...il.com,
rostedt@...dmis.org, zhaolei@...fujitsu.com, laijs@...fujitsu.com,
Li Zefan <lizf@...fujitsu.com>, tzanussi@...il.com
CC: linux-kernel@...r.kernel.org
Subject: [PATCH v2] ftrace: add a tracepoint for __raise_softirq_irqoff()
From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
This patch is modified from Mathieu Desnoyers' patch. The original patch
can be found here:
http://marc.info/?l=linux-kernel&m=123791201816245&w=2
This tracepoint can trace the time stamp when softirq action is raised.
Change log for v1 -> v2:
1: Use TRACE_EVENT instead of DEFINE_TRACE
2: Move the tracepoint from raise_softirq_irqoff() to __raise_softirq_irqoff()
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
include/linux/interrupt.h | 9 ++++++++-
include/trace/events/irq.h | 18 ++++++++++++++++++
2 files changed, 26 insertions(+), 1 deletions(-)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 912c52c..86bae89 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -361,7 +361,14 @@ asmlinkage void do_softirq(void);
asmlinkage void __do_softirq(void);
extern void open_softirq(int nr, void (*action)(struct softirq_action *));
extern void softirq_init(void);
-#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
+
+#include <trace/events/irq.h>
+static inline void __raise_softirq_irqoff(unsigned int nr)
+{
+ trace_irq_softirq_raise(nr);
+ or_softirq_pending(1UL << nr);
+}
+
extern void raise_softirq_irqoff(unsigned int nr);
extern void raise_softirq(unsigned int nr);
extern void wakeup_softirqd(void);
diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
index 7686864..2628e08 100644
--- a/include/trace/events/irq.h
+++ b/include/trace/events/irq.h
@@ -90,6 +90,24 @@ TRACE_EVENT(softirq_exit,
TP_printk("softirq=%d action=%s", __entry->vec, __get_str(name))
);
+TRACE_EVENT(irq_softirq_raise,
+
+ TP_PROTO(unsigned int nr),
+
+ TP_ARGS(nr),
+
+ TP_STRUCT__entry(
+ __field( unsigned int, nr )
+ ),
+
+ TP_fast_assign(
+ __entry->nr = nr;
+ ),
+
+ TP_printk("softirq=%d action=%s is raised",
+ __entry->nr, softirq_to_name[__entry->nr])
+);
+
#endif /* _TRACE_IRQ_H */
/* This part must be outside protection */
--
1.6.1.2
--
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