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

Shunsuke Nakamura
2021-09-22T10:16:48Z

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