From c2adae0970ca1db8adb92fb56ae3bcabd916e8bd Mon Sep 17 00:00:00 2001
From: Steven Rostedt <srostedt@redhat.com>
Date: Wed, 20 May 2009 19:56:19 -0400
Subject: tracing: convert irq events to use __print_symbolic
The recording of the names at trace time is inefficient. This patch
implements the softirq event recording to only record the vector
and then use the __print_symbolic interface to print out the names.
[ Impact: faster recording of softirq events ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
include/trace/events/irq.h | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
(limited to 'include')
diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
index 32a9f7ef432..683fb36a994 100644
--- a/include/trace/events/irq.h
+++ b/include/trace/events/irq.h
@@ -7,6 +7,19 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM irq
+#define softirq_name(sirq) { sirq, #sirq }
+#define show_softirq_name(val) \
+ __print_symbolic(val, \
+ softirq_name(HI_SOFTIRQ), \
+ softirq_name(TIMER_SOFTIRQ), \
+ softirq_name(NET_TX_SOFTIRQ), \
+ softirq_name(NET_RX_SOFTIRQ), \
+ softirq_name(BLOCK_SOFTIRQ), \
+ softirq_name(TASKLET_SOFTIRQ), \
+ softirq_name(SCHED_SOFTIRQ), \
+ softirq_name(HRTIMER_SOFTIRQ), \
+ softirq_name(RCU_SOFTIRQ))
+
/**
* irq_handler_entry - called immediately before the irq action handler
* @irq: irq number
@@ -87,15 +100,14 @@ TRACE_EVENT(softirq_entry,
TP_STRUCT__entry(
__field( int, vec )
- __string( name, softirq_to_name[h-vec] )
),
TP_fast_assign(
__entry->vec = (int)(h - vec);
- __assign_str(name, softirq_to_name[h-vec]);
),
- TP_printk("softirq=%d action=%s", __entry->vec, __get_str(name))
+ TP_printk("softirq=%d action=%s", __entry->vec,
+ show_softirq_name(__entry->vec))
);
/**
@@ -117,15 +129,14 @@ TRACE_EVENT(softirq_exit,
TP_STRUCT__entry(
__field( int, vec )
- __string( name, softirq_to_name[h-vec] )
),
TP_fast_assign(
__entry->vec = (int)(h - vec);
- __assign_str(name, softirq_to_name[h-vec]);
),
- TP_printk("softirq=%d action=%s", __entry->vec, __get_str(name))
+ TP_printk("softirq=%d action=%s", __entry->vec,
+ show_softirq_name(__entry->vec))
);
#endif /* _TRACE_IRQ_H */
--
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