Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 15 Dec 2009 19:17:03 +0800 | From | Xiao Guangrong <> | Subject | [PATCH 0/4] perf_event: introduce 'perf timer' to analyze timer's behavior |
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Hi,
We introduce 'perf timer' in this patchset, it can analyze timer latency and timer function handle time, the usage and result is like below:
# perf timer record # perf timer lat --print-lat --print-handle ------------------------------------------------------------------------------------------------------- | Timer | TYPE | Avg-latency | Max-latency | Max-latency-at-TS |Max-lat-at-Task | |0xf7ad1f5c |hrtimer |996068.500 ns|1607650 ns|10270128658526 |init | |0xf7903f04 |timer |0.625 HZ|2 HZ|10270344082394 |swapper | |0xf787a05c |hrtimer |200239.500 ns|359929 ns|10269316024808 |main | |main :[ PROF]|itimer |0.000 HZ|0 HZ|10237021270557 |main | |main :[VIRTUAL]|itimer |0.000 HZ|0 HZ|10257314773501 |main |
......
------------------------------------------------------------------------------------------------------- | Timer | TYPE | Avg-handle (ms)|Max-handle(ms)| Max-handle-at-TS(s)|Max-lat-at-func | |0xf7ad1f5c |hrtimer |0.025 |0.025 |10270.129 |0xc016b5b0 | |0xf7903f04 |timer |0.009 |0.011 |10260.342 |0xc0159240 | |0xf787a05c |hrtimer |0.031 |0.062 |10267.018 |0xc014cc40 |
And, in current code, it'll complain with below message when we use 'perf timer lat': # ./perf timer lat Warning: unknown op '{' Warning: Error: expected type 5 but read 1 Warning: failed to read event print fmt for hrtimer_start Warning: unknown op '{' Warning: Error: expected type 5 but read 1 Warning: failed to read event print fmt for hrtimer_expire_entry It's because perf parse "hrtimer_start" and "hrtimer_expire_entry" fail, but it not hurt using. See: http://lkml.org/lkml/2009/10/12/726 include/trace/events/timer.h | 8 tools/perf/Documentation/perf-timer.txt | 40 + tools/perf/Makefile | 1 tools/perf/builtin-sched.c | 3 tools/perf/builtin-timer.c | 954 ++++++++++++++++++++++++++++++++ tools/perf/builtin.h | 1 tools/perf/command-list.txt | 1 tools/perf/perf.c | 1 tools/perf/util/trace-event-parse.c | 25 tools/perf/util/trace-event.h | 4 10 files changed, 1030 insertions(+), 8 deletions(-)
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