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[RFC][Patch 2/2] markers: example of irq regular kernel markers
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: Mathieu Desnoyers <mathieu dot desnoyers at polymtl dot ca>, Peter Zijlstra <peterz at infradead dot org>, Steven Rostedt <rostedt at goodmis dot org>, "Frank Ch. Eigler" <fche at redhat dot com>, Ingo Molnar <mingo at elte dot hu>
- Cc: LKML <linux-kernel at vger dot kernel dot org>, systemtap-ml <systemtap at sources dot redhat dot com>, Hideo AOKI <haoki at redhat dot com>
- Date: Fri, 20 Jun 2008 13:03:02 -0400
- Subject: [RFC][Patch 2/2] markers: example of irq regular kernel markers
Add trace points of irq handle events ported from LTTng's markers.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
---
I just rewrote LTTng's irq event by using DEFINE_TRACE for example.
include/linux/irq_trace.h | 6 ++++++
kernel/irq/handle.c | 6 ++++++
2 files changed, 12 insertions(+)
Index: 2.6.26-rc5-mm3/include/linux/irq_trace.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ 2.6.26-rc5-mm3/include/linux/irq_trace.h 2008-06-16 12:27:51.000000000 -0400
@@ -0,0 +1,6 @@
+#include <linux/marker.h>
+
+DEFINE_TRACE(irq_entry, (int irq_id, int kernel_mode), irq_id, kernel_mode);
+
+DEFINE_TRACE(irq_exit, (void));
+
Index: 2.6.26-rc5-mm3/kernel/irq/handle.c
===================================================================
--- 2.6.26-rc5-mm3.orig/kernel/irq/handle.c 2008-06-16 12:27:50.000000000 -0400
+++ 2.6.26-rc5-mm3/kernel/irq/handle.c 2008-06-16 12:27:51.000000000 -0400
@@ -15,6 +15,7 @@
#include <linux/random.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
+#include <linux/irq_trace.h>
#include "internals.h"
@@ -130,6 +131,9 @@ irqreturn_t handle_IRQ_event(unsigned in
{
irqreturn_t ret, retval = IRQ_NONE;
unsigned int status = 0;
+ struct pt_regs *regs = get_irq_regs();
+
+ trace_irq_entry(irq, (regs)?(!user_mode(regs)):(1));
handle_dynamic_tick(action);
@@ -148,6 +152,8 @@ irqreturn_t handle_IRQ_event(unsigned in
add_interrupt_randomness(irq);
local_irq_disable();
+ trace_irq_exit();
+
return retval;
}
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com