linux-kernel - [PATCH v3 0/3] libperf: Unify scaling of counters obtained from perf_evsel_

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Message-Id: <20211109085831.3770594-1-nakamura.shun@fujitsu.com>
Date:   Tue,  9 Nov 2021 17:58:28 +0900
From:   Shunsuke Nakamura <nakamura.shun@...itsu.com>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, robh@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v3 0/3] libperf: Unify scaling of counters obtained from perf_evsel__read()

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