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Date: Thu, 14 May 2020 13:36:33 +0800
From: Jin Yao <yao.jin@...ux.intel.com>
To: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc: Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com,
Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH v5 0/5] perf stat: Support overall statistics for interval mode
Currently perf-stat supports to print counts at regular interval (-I),
but it's not very easy for user to get the overall statistics.
With this patchset, it supports to report the summary at the end of
interval output.
For example,
root@...-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@...-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@...-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
v5:
---
1. Create new patch "perf stat: Save aggr value to first member
of prev_raw_counts".
2. Call perf_evlist__save_aggr_prev_raw_counts to save aggr value
to first member of prev_raw_counts for AGGR_GLOBAL. Then next,
perf_stat_process_counter can create aggr values from per cpu
values.
Following patches are impacted in v5:
perf stat: Copy counts from prev_raw_counts to evsel->counts
perf stat: Save aggr value to first member of prev_raw_counts
perf stat: Report summary for interval mode
v4:
---
1. Create runtime_stat_reset.
2. Zero the aggr in perf_counts__reset and use it to reset
prev_raw_counts.
3. Move affinity setup and read_counter_cpu to a new function
read_affinity_counters. It's only called when stat_config.summary
is not set.
v3:
---
1. 'perf stat: Fix wrong per-thread runtime stat for interval mode'
is a new patch which fixes an existing issue found in test.
2. We use the prev_raw_counts for summary counts. Drop the summary_counts in v2.
3. Fix some issues.
v2:
---
Rebase to perf/core branch
Jin Yao (5):
perf stat: Fix wrong per-thread runtime stat for interval mode
perf counts: Reset prev_raw_counts counts
perf stat: Copy counts from prev_raw_counts to evsel->counts
perf stat: Save aggr value to first member of prev_raw_counts
perf stat: Report summary for interval mode
tools/perf/builtin-stat.c | 101 ++++++++++++++++++++++++++------------
tools/perf/util/counts.c | 4 +-
tools/perf/util/counts.h | 1 +
tools/perf/util/stat.c | 43 +++++++++++++---
tools/perf/util/stat.h | 3 ++
5 files changed, 113 insertions(+), 39 deletions(-)
--
2.17.1
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