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Subject[PATCH 3/6] trace: Add tracepoints to IRQ work run handler
Date
This is a part of overall effort to trace all the interrupts happening
in a system to figure out what time is spent in kernel space versus user
space.

Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
---
include/trace/events/irq.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
kernel/irq_work.c | 4 ++++
2 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
index e6e72e0..d8fab89 100644
--- a/include/trace/events/irq.h
+++ b/include/trace/events/irq.h
@@ -295,6 +295,50 @@ DEFINE_EVENT(timer_interrupt, timer_nohz_exit,
TP_ARGS(ignore)
);

+DECLARE_EVENT_CLASS(irq_work,
+
+ TP_PROTO(unsigned int ignore),
+
+ TP_ARGS(ignore),
+
+ TP_STRUCT__entry(
+ __field( unsigned int, ignore )
+ ),
+
+ TP_fast_assign(
+ __entry->ignore = ignore;
+ ),
+
+ TP_printk("%u", __entry->ignore)
+);
+
+/**
+ * irq_work_run_entry - called immediately after entering the irq work
+ * handler
+ *
+ * When used in combination with the irq_work_run_exit tracepoint
+ * we can determine the irq work handler runtime.
+ */
+DEFINE_EVENT(irq_work, irq_work_run_entry,
+
+ TP_PROTO(unsigned int ignore),
+
+ TP_ARGS(ignore)
+);
+
+/**
+ * irq_work_run_exit - called just before the irq work handler returns
+ *
+ * When used in combination with the irq_work_run_entry tracepoint
+ * we can determine the irq work handler runtime.
+ */
+DEFINE_EVENT(irq_work, irq_work_run_exit,
+
+ TP_PROTO(unsigned int ignore),
+
+ TP_ARGS(ignore)
+);
+
#endif /* _TRACE_IRQ_H */

/* This part must be outside protection */
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index c58fa7d..7e78122 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/irq_work.h>
#include <linux/hardirq.h>
+#include <trace/events/irq.h>

/*
* An entry can be in one of four states:
@@ -125,6 +126,8 @@ void irq_work_run(void)
if (this_cpu_read(irq_work_list) == NULL)
return;

+ trace_irq_work_run_entry(0);
+
BUG_ON(!in_irq());
BUG_ON(!irqs_disabled());

@@ -149,6 +152,7 @@ void irq_work_run(void)
next_flags(NULL, IRQ_WORK_BUSY),
NULL);
}
+ trace_irq_work_run_exit(0);
}
EXPORT_SYMBOL_GPL(irq_work_run);

--
1.7.3.1


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