Rebased tree and fixed Jiri's last feedback.
[v5: Fix mainly bisect problems. No regressions introduced by one
patch and fixed again later. Some minor fixes in addition]
[v6: Fix running/noise printing patch.]
[v7: Reorder and merge two patches to avoid a bisect hole where unsupported was
printed as 0]
[v8: Minor fixes for review feedback. See changelog in patches.]
[v9: Fix newline bug. Add support for -A for --metric-only]
[v10: Remove extra "noise" printing (Jiri)
Fix fields in documentation (Jiri)]
[v11: Fix manpage again. Avoid extra metric output in CSV mode.]
[v12: Move CSV metrics fields to after running/enabled/variance.
Fix regression with not counted counters.
Minor fixes.]
Currently perf stat does not support printing computed metrics for interval (-I
xxx)
or CSV (-x,) mode. For example IPC or TSX metrics over time are quite useful to
know.
This patch implements them. The main obstacle was that the
metrics printing was all open coded all over the metrics computation code.
The second patch refactors the metrics printing to work through call backs that
can be more easily changed. This also cleans up the metrics printing
significantly.
The indentation is now handled through printf, no more need to manually count
spaces.
Then based on that it implements metrics printing for CSV and interval mode,
and finally a --metric-only mode.
Example output:
% perf stat -I1000 -a sleep 1
# time counts unit events metric
multiplex
1.001301370 12020.049593 task-clock (msec)
(100.00%)
1.001301370 3,952 context-switches # 0.329
K/sec (100.00%)
1.001301370 69 cpu-migrations # 0.006
K/sec (100.00%)
1.001301370 76 page-faults # 0.006
K/sec
1.001301370 386,582,789 cycles # 0.032
GHz (100.00%)
1.001301370 716,441,544 stalled-cycles-frontend # 185.33%
frontend cycles idle (100.00%)
1.001301370 <not supported> stalled-cycles-backend
1.001301370 101,751,678 instructions # 0.26
insn per cycle
1.001301370 # 7.04
stalled cycles per insn (100.00%)
1.001301370 20,914,692 branches # 1.740
M/sec (100.00%)
1.001301370 1,943,630 branch-misses # 9.29%
of all branches
CSV mode:
% perf stat -x, -I1000 -a sleep 1
1.000982778,12006.549977,,task-clock,12006547787,100.00,,,,
1.000982778,12822,,context-switches,12007100604,100.00,0.001,M/sec
1.000982778,175,,cpu-migrations,12007180306,100.00,0.015,K/sec
1.000982778,3404,,page-faults,12007185482,100.00,0.284,K/sec
1.000982778,1930307489,,cycles,12007018233,100.00,0.161,GHz
1.000982778,6971803638,,stalled-cycles-frontend,12006902870,100.00,361.18,frontend
cycles idle
1.000982778,<not supported>,,stalled-cycles-backend,0,100.00,,,,
1.000982778,464493941,,instructions,12006873327,100.00,0.24,insn per cycle
1.000982778,,,,,,15.01,stalled cycles per insn
1.000982778,86548409,,branches,12006758420,100.00,7.208,M/sec
1.000982778,4933638,,branch-misses,12006648104,100.00,5.70,of all branches
Now includes metrics
Metric only mode:
Concicse information if you only care about computed metrics, not raw values
% perf stat --metric-only -a -I 1000
1.001750901 frontend cycles idle backend cycles idle insn per cycle
stalled cycles per insn branch-misses of all branches
1.001750901 188.78% 0.53
3.56 4.19%
2.002625926 233.68% 0.86
2.30 2.84%
3.003296456 236.16% 1.18
1.58 2.87%
4.004095913 129.87% 0.24
7.82 2.08%
5.004964861 116.26% 0.17
11.35 1.43%
6.005802242 148.16% 0.19
10.05 1.54%
7.006485273 151.76% 0.18
11.25 1.88%
Metric only mode in CSV (flat format, easy to plot and analyze in statistical
tools like JMP, R, pandas, gnuplot):
% perf stat -x, --metric-only -a -I 1000
1.001381652,frontend cycles idle,backend cycles idle,insn per
cycle,stalled cycles per insn,branch-misses of all branches,
1.001381652,173.32,,0.83,2.09,1.73,
2.002073343,199.47,,1.07,1.60,2.14,
3.002875524,109.52,,0.22,7.83,1.63,
4.003970059,132.10,,0.17,10.85,1.51,
5.004818754,181.60,,0.22,8.87,2.22,
Available in
git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc-2.6
perf/stat-metrics-16
