lkml.org 
[lkml]   [2018]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v4 0/2] perf stat: Add interval-count and time support
Date
From: yuzhoujian <yuzhoujian@didichuxing.com>

Introduce two new options for perf stat and update perf-stat documentation
accordingly.

The interval-count option can be used to print counts for fixed number of
times, and it should be used specifically with "-I" option.

Show below is the output of the interval-count option for perf stat.

$ perf stat -I 1000 --interval-count 2 -e cycles -a
# time counts unit events
1.002827089 93,884,870 cycles
2.004231506 56,573,446 cycles

The time option can be used to print counts after a period of time, and it
should not be used with "-I" option.

Show below is the output of the time option for perf stat.

$ perf stat --time 2000 -e cycles -a
Performance counter stats for 'system wide':

157,260,423 cycles

2.003060766 seconds time elapsed

yuzhoujian (2):
perf stat: Add support to print counts for fixed times
perf stat: Add support to print counts after a period of time

Changes since v3:
- merge interval_count check and times check to one line.
- fix the wrong indent in stat.h
- use stat_config.times instead of 'times' in cmd_stat function.

Changes since v2:
- modify the time check in __run_perf_stat func to keep some consistency
with the workload case.
- add the warning when the time is set between 10ms to 100ms.
- add the pr_err when the time is set below 10ms.

Changes since v1:
- change the name of the new option "times-print" to "interval-count".
- keep the interval-count option interval specifically.


tools/perf/Documentation/perf-stat.txt | 10 +++++++
tools/perf/builtin-stat.c | 53 ++++++++++++++++++++++++++++++++--
tools/perf/util/stat.h | 2 ++
3 files changed, 62 insertions(+), 3 deletions(-)

--
2.14.1

\
 
 \ /
  Last update: 2018-01-29 10:26    [W:0.242 / U:1.476 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site