Messages in this thread | | | From | Shunsuke Nakamura <> | Subject | [PATCH v3 0/3] libperf: Unify scaling of counters obtained from perf_evsel__read() | Date | Tue, 9 Nov 2021 17:58:28 +0900 |
| |
This patch series unifies the counters that can be obtained from perf_evsel__read() to "no scaling". The counter scaling will be done using a function moved from tools/perf/util.
The first patch move perf_counts_values__scale from tools/perf/util to tools/lib/perf so that it can be used with libperf.
The second patch removes the scaling process from perf_mmap__read_self().
The third patch adds a verification test to make sure that it scales correctly when multiplexed.
--- Previous version at: https://lore.kernel.org/linux-perf-users/20210922101627.3396398-1-nakamura.shun@fujitsu.com/
Changes in v3: - Move scaling process from tools/perf/util to tools/lib/perf - Remove scaling process from perf_mmap__read_self() - Remove scaling process for perf_mmap__read_self - Remove test to verify that no division by zero occurs
Changes in v2: - Fix not to divide by zero when counter scaling - Add test to verify that no division by zero occurs
[1] https://github.com/deater/perf_event_tests/blob/master/tests/rdpmc/rdpmc_multiplexing.c
Shunsuke Nakamura (3): libperf: Move perf_counts_values__scale to tools/lib/perf libperf: Remove scaling process from perf_mmap__read_self() libperf tests: Add test_stat_multiplexing test
tools/lib/perf/evsel.c | 19 ++++ tools/lib/perf/include/perf/evsel.h | 4 + tools/lib/perf/libperf.map | 1 + tools/lib/perf/mmap.c | 2 - tools/lib/perf/tests/test-evlist.c | 157 ++++++++++++++++++++++++++++ tools/perf/util/evsel.c | 19 ---- tools/perf/util/evsel.h | 3 - 7 files changed, 181 insertions(+), 24 deletions(-)
-- 2.27.0
| |