linux-kernel - [PATCH 00/10] tracepoint perf counter events and new ABI

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Date:	Thu, 19 Mar 2009 20:26:10 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	mingo@...e.hu, paulus@...ba.org, rostedt@...dmis.org
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 00/10] tracepoint perf counter events and new ABI

These patches change the event tracer to provide id files:

[root@...eron ~]# for i in /debug/tracing/events/irq/*/id; do echo `cat $i` - $i; done
28 - /debug/tracing/events/irq/irq_handler_entry/id
29 - /debug/tracing/events/irq/irq_handler_exit/id
27 - /debug/tracing/events/irq/softirq_entry/id
26 - /debug/tracing/events/irq/softirq_exit/id

These can then be used in profiling as:

[root@...eron linux-2.6]# ~/perfstat -e 2:28 make O=native-build/ -j4 lib
...

 Performance counter stats for 'make':

   18280.657602  task clock ticks     (msecs)

            465  tp: 28               (events)

 Wall-clock time elapsed: 11265.199196 msecs

Showing that we had 465 irq_handler_entry events during that workload.

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