[patch 3/9] LTTng instrumentation tasklets

[Mathieu Desnoyers]

tasklet entry and exit events.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
CC: 'Ingo Molnar' <mingo@xxxxxxx>
CC: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CC: Jason Baron <jbaron@xxxxxxxxxx>
CC: 'Peter Zijlstra' <peterz@xxxxxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Russell King <rmk+lkml@xxxxxxxxxxxxxxxx>
CC: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
CC: "Frank Ch. Eigler" <fche@xxxxxxxxxx>
CC: 'Hideo AOKI' <haoki@xxxxxxxxxx>
CC: Takashi Nishiie <t-nishiie@xxxxxxxxxxxxxxxxxx>
CC: 'Steven Rostedt' <rostedt@xxxxxxxxxxx>
CC: Eduard - Gabriel Munteanu <eduard.munteanu@xxxxxxxxxxx>
---
 include/trace/irq.h |   13 +++++++++++++
 kernel/softirq.c    |   10 ++++++++++
 2 files changed, 23 insertions(+)

Index: linux-2.6-lttng/kernel/softirq.c
===================================================================
--- linux-2.6-lttng.orig/kernel/softirq.c	2009-03-24 11:46:28.000000000 -0400
+++ linux-2.6-lttng/kernel/softirq.c	2009-03-24 11:48:36.000000000 -0400
@@ -23,6 +23,7 @@
 #include <linux/rcupdate.h>
 #include <linux/smp.h>
 #include <linux/tick.h>
+#include <trace/irq.h>
 
 #include <asm/irq.h>
 /*
@@ -52,6 +53,11 @@ static struct softirq_action softirq_vec
 
 static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
+DEFINE_TRACE(irq_tasklet_high_entry);
+DEFINE_TRACE(irq_tasklet_high_exit);
+DEFINE_TRACE(irq_tasklet_low_entry);
+DEFINE_TRACE(irq_tasklet_low_exit);
+
 /*
  * we cannot loop indefinitely here to avoid userspace starvation,
  * but we also don't want to introduce a worst case 1/HZ latency
@@ -380,7 +386,9 @@ static void tasklet_action(struct softir
 			if (!atomic_read(&t->count)) {
 				if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
 					BUG();
+				trace_irq_tasklet_low_entry(t);
 				t->func(t->data);
+				trace_irq_tasklet_low_exit(t);
 				tasklet_unlock(t);
 				continue;
 			}
@@ -415,7 +423,9 @@ static void tasklet_hi_action(struct sof
 			if (!atomic_read(&t->count)) {
 				if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
 					BUG();
+				trace_irq_tasklet_high_entry(t);
 				t->func(t->data);
+				trace_irq_tasklet_high_exit(t);
 				tasklet_unlock(t);
 				continue;
 			}
Index: linux-2.6-lttng/include/trace/irq.h
===================================================================
--- linux-2.6-lttng.orig/include/trace/irq.h	2009-03-24 11:46:29.000000000 -0400
+++ linux-2.6-lttng/include/trace/irq.h	2009-03-24 11:48:36.000000000 -0400
@@ -19,4 +19,17 @@ DECLARE_TRACE(irq_next_handler,
 	TPPROTO(unsigned int id, struct irqaction *action, irqreturn_t ret),
 		TPARGS(id, action, ret));
 
+DECLARE_TRACE(irq_tasklet_low_entry,
+	TPPROTO(struct tasklet_struct *t),
+		TPARGS(t));
+DECLARE_TRACE(irq_tasklet_low_exit,
+	TPPROTO(struct tasklet_struct *t),
+		TPARGS(t));
+DECLARE_TRACE(irq_tasklet_high_entry,
+	TPPROTO(struct tasklet_struct *t),
+		TPARGS(t));
+DECLARE_TRACE(irq_tasklet_high_exit,
+	TPPROTO(struct tasklet_struct *t),
+		TPARGS(t));
+
 #endif

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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