linux-kernel - [PATCH v2 0/2] libperf: Add support for scaling counters obtained from the read() system call during multiplexing

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Date:   Wed, 22 Sep 2021 19:16:25 +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
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: [PATCH v2 0/2] libperf: Add support for scaling counters obtained from the read() system call during multiplexing

This patch series supports counter scaling when perf_evsel__read() obtains a counter
using the read() system call during multiplexing.

The first patch adds scaling of counters obtained from the read() system call
during multiplexing.

The second patch adds a test for the first patch.
This patch is based on Vince's rdpmc_multiplexing.c [1]

---
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


nakamura shunsuke (2):
  libperf: Add processing to scale the counters obtained during the
    read() system call when multiplexing
  libperf tests: Add test_stat_multiplexing test

 tools/lib/perf/evsel.c             |   6 +
 tools/lib/perf/tests/test-evlist.c | 183 +++++++++++++++++++++++++++++
 2 files changed, 189 insertions(+)

-- 
2.27.0