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c7e5b328a8
Currently 'perf stat' supports to print counts at regular interval (-I),
but it's not very easy for user to get the overall statistics.
The patch uses 'evsel->prev_raw_counts' to get counts for summary. Copy
the counts to 'evsel->counts' after printing the interval results.
Next, we just follow the non-interval processing.
Let's see some examples,
root@kbl-ppc:~# perf stat -e cycles -I1000 --interval-count 2
# time counts unit events
1.000412064 2,281,114 cycles
2.001383658 2,547,880 cycles
Performance counter stats for 'system wide':
4,828,994 cycles
2.002860349 seconds time elapsed
root@kbl-ppc:~# perf stat -e cycles,instructions -I1000 --interval-count 2
# time counts unit events
1.000389902 1,536,093 cycles
1.000389902 420,226 instructions # 0.27 insn per cycle
2.001433453 2,213,952 cycles
2.001433453 735,465 instructions # 0.33 insn per cycle
Performance counter stats for 'system wide':
3,750,045 cycles
1,155,691 instructions # 0.31 insn per cycle
2.003023361 seconds time elapsed
root@kbl-ppc:~# perf stat -M CPI,IPC -I1000 --interval-count 2
# time counts unit events
1.000435121 905,303 inst_retired.any # 2.9 CPI
1.000435121 2,663,333 cycles
1.000435121 914,702 inst_retired.any # 0.3 IPC
1.000435121 2,676,559 cpu_clk_unhalted.thread
2.001615941 1,951,092 inst_retired.any # 1.8 CPI
2.001615941 3,551,357 cycles
2.001615941 1,950,837 inst_retired.any # 0.5 IPC
2.001615941 3,551,044 cpu_clk_unhalted.thread
Performance counter stats for 'system wide':
2,856,395 inst_retired.any # 2.2 CPI
6,214,690 cycles
2,865,539 inst_retired.any # 0.5 IPC
6,227,603 cpu_clk_unhalted.thread
2.003403078 seconds time elapsed
Committer testing:
Before:
# perf stat -e cycles -I1000 --interval-count 2
# time counts unit events
1.000618627 26,877,408 cycles
2.001417968 233,672,829 cycles
#
After:
# perf stat -e cycles -I1000 --interval-count 2
# time counts unit events
1.001531815 5,341,388,792 cycles
2.002936530 100,073,912 cycles
Performance counter stats for 'system wide':
5,441,462,704 cycles
2.004893794 seconds time elapsed
#
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200520042737.24160-6-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.