Messages in this thread | | | Date | Wed, 8 Mar 2023 14:59:01 -0800 | Subject | [PATCH v4 00/11] Better fixes for grouping of events | From | Ian Rogers <> |
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The rules for grouping events have grown more complex. Topdown events must be grouped, but flags like --metric-no-group and flags on metrics don't respect this. Uncore events may be expanded using wild cards for PMU names, but then the events need reordering so the group members are adjacent. Rather than fixing metrics, this change fixes the main event parsing code to first sort and then regroup evsels.
As this is shared functionality changes to it should cause concern. The change is done with the intent of simplifying and making more robust the grouping logic, examples are given. If additional changes are necessary, they are most likely necessary to the evsel__group_pmu_name logic as the code avoids breaking groups that are on the same "group" PMU. The group_pmu_name is a variant of the pmu_name tweaked in the case of software and aux events, that use groups in a slightly different manner to conventional events.
The code was manually tested as well as passing perf test on a Intel tigerlake CPU with intel-pt.
v4. Move the Intel pmu->auxtrace initialization to the existing perf_pmu__get_default_config as suggested by Adrian Hunter. v3. Rename pmu_name to group_pmu_name and add patch to warn when events are regrouped as requested by Namhyung. v2. Fix up the commit message on 4/10 (thanks Arnaldo). Drop unnecessary v1 5/10 (thanks Kan). evlist->core.nr_groups wasn't being correctly maintained after the sort/regrouping and so the new patch 10/10 removes that variable and computes it from the evlist when necessary, generally just tests.
Ian Rogers (11): libperf evlist: Avoid a use of evsel idx perf stat: Don't remove all grouped events when CPU maps disagree perf pmu: Earlier PMU auxtrace initialization perf stat: Modify the group test perf evsel: Allow const evsel for certain accesses perf evsel: Add function to compute group PMU name perf parse-events: Pass ownership of the group name perf parse-events: Sort and group parsed events perf evsel: Remove use_uncore_alias perf evlist: Remove nr_groups perf parse-events: Warn when events are regrouped
tools/lib/perf/evlist.c | 31 ++- tools/lib/perf/include/internal/evlist.h | 1 - tools/lib/perf/include/perf/evlist.h | 1 + tools/perf/arch/x86/util/auxtrace.c | 4 - tools/perf/arch/x86/util/evlist.c | 39 ++-- tools/perf/arch/x86/util/pmu.c | 8 +- tools/perf/builtin-record.c | 2 +- tools/perf/builtin-report.c | 2 +- tools/perf/builtin-stat.c | 24 +- tools/perf/tests/bpf.c | 1 - tools/perf/tests/parse-events.c | 24 +- tools/perf/tests/pfm.c | 12 +- tools/perf/tests/pmu-events.c | 2 +- tools/perf/util/evlist.c | 2 +- tools/perf/util/evlist.h | 8 +- tools/perf/util/evsel.c | 27 ++- tools/perf/util/evsel.h | 8 +- tools/perf/util/header.c | 3 +- tools/perf/util/metricgroup.c | 3 +- tools/perf/util/parse-events.c | 268 +++++++++++------------ tools/perf/util/parse-events.h | 14 +- tools/perf/util/parse-events.y | 28 +-- tools/perf/util/pfm.c | 1 - tools/perf/util/pmu.c | 6 +- tools/perf/util/python.c | 2 +- tools/perf/util/stat-shadow.c | 2 +- 26 files changed, 277 insertions(+), 246 deletions(-)
-- 2.40.0.rc0.216.gc4246ad0f0-goog
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