linux-kernel - [PATCH 0/4] perf_event: introduce 'perf timer' to analyze timer's behavior

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Date:	Tue, 15 Dec 2009 19:17:03 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/4] perf_event: introduce 'perf timer' to analyze timer's
 behavior

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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