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Gmane
From: Peter Zijlstra <a.p.zijlstra <at> chello.nl>
Subject: [PATCH 00/10] tracepoint perf counter events and new ABI
Newsgroups: gmane.linux.kernel
Date: Thursday 19th March 2009 19:26:10 UTC (over 7 years ago)
These patches change the event tracer to provide id files:

[[email protected] ~]# 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:

[[email protected] 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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CD: 5ms