[v4,00/35] PMU refactoring and improvements

Message

Ian Rogers May 26, 2023, 9:53 p.m. UTC

Separate the code in pmu.[ch] into the set/list of PMUs and the code
for a particular PMU. Move the set/list of PMUs code into
pmus.[ch]. Clean up hybrid code and remove hybrid PMU list, it is
sufficient to scan PMUs looking for core ones. Add core PMU list and
perf_pmus__scan_core that just reads core PMUs. Switch code that skips
non-core PMUs during a perf_pmus__scan, to use the
perf_pmus__scan_core variant. Don't scan sysfs for PMUs if all such
PMUs have been previously scanned/loaded. Scanning just core PMUs, for
the cases it is applicable, can improve the sysfs reading time by more
than 4 fold on my laptop, as servers generally have many more uncore
PMUs the improvement there should be larger:

```
$ perf bench internals pmu-scan -i 1000
Computing performance of sysfs PMU event scan for 1000 times
  Average core PMU scanning took: 989.231 usec (+- 1.535 usec)
  Average PMU scanning took: 4309.425 usec (+- 74.322 usec)
```

The patch "perf pmu: Separate pmu and pmus" moves and renames a lot of
functions, and is consequently large. The changes are trivial, but
kept together to keep the overall number of patches more reasonable.

v4. On patch 16 (perf pmu: Remove perf_pmu__hybrid_mounted) remove the
    handling of no cpus for a hybrid core PMU following discussion
    with Kan:
    https://lore.kernel.org/lkml/[e-mail]/
    On patch 9 (perf evlist: Propagate user CPU maps intersecting core
    PMU maps) fix the comment on struct perf_evsel's system_wide
    variable from conversation with Namhyung:
    https://lore.kernel.org/lkml/[e-mail]/
v3. Address fixing hybrid user specified CPU maps by doing it in
    propagate maps. Remove nearly all references to cpu_core/cpu_atom
    in particular by removing is_pmu_hybrid - hybrid is now >1 core
    PMU. Addresses comments by Kan and Namhyung.
v2. Address Kan's review comments wrt "cycles" -> "cycles:P" and
    "uncore_pmus" -> "other_pmus".

Ian Rogers (35):
  perf cpumap: Add intersect function
  perf tests: Organize cpu_map tests into a single suite
  perf cpumap: Add equal function
  libperf cpumap: Add "any CPU"/dummy test function
  perf pmu: Detect ARM and hybrid PMUs with sysfs
  perf pmu: Add is_core to pmu
  perf evsel: Add is_pmu_core inorder to interpret own_cpus
  perf pmu: Add CPU map for "cpu" PMUs
  perf evlist: Propagate user CPU maps intersecting core PMU maps
  perf evlist: Allow has_user_cpus to be set on hybrid
  perf target: Remove unused hybrid value
  perf tools: Warn if no user requested CPUs match PMU's CPUs
  perf evlist: Remove evlist__warn_hybrid_group
  perf evlist: Remove __evlist__add_default
  perf evlist: Reduce scope of evlist__has_hybrid
  perf pmu: Remove perf_pmu__hybrid_mounted
  perf pmu: Rewrite perf_pmu__has_hybrid to avoid list
  perf x86: Iterate hybrid PMUs as core PMUs
  perf topology: Avoid hybrid list for hybrid topology
  perf evsel: Compute is_hybrid from PMU being core
  perf header: Avoid hybrid PMU list in write_pmu_caps
  perf metrics: Remove perf_pmu__is_hybrid use
  perf stat: Avoid hybrid PMU list
  perf mem: Avoid hybrid PMU list
  perf pmu: Remove perf_pmu__hybrid_pmus list
  perf pmus: Prefer perf_pmu__scan over perf_pmus__for_each_pmu
  perf x86 mem: minor refactor to is_mem_loads_aux_event
  perf pmu: Separate pmu and pmus
  perf pmus: Split pmus list into core and other
  perf pmus: Allow just core PMU scanning
  perf pmus: Avoid repeated sysfs scanning
  perf pmus: Ensure all PMUs are read for find_by_type
  perf pmus: Add function to return count of core PMUs
  perf pmus: Remove perf_pmus__has_hybrid
  perf pmu: Remove is_pmu_hybrid

 tools/lib/perf/cpumap.c                 |  61 +++
 tools/lib/perf/evlist.c                 |  25 +-
 tools/lib/perf/include/internal/evsel.h |  15 +-
 tools/lib/perf/include/perf/cpumap.h    |  14 +
 tools/perf/arch/arm/util/auxtrace.c     |   7 +-
 tools/perf/arch/arm/util/cs-etm.c       |   4 +-
 tools/perf/arch/arm64/util/pmu.c        |   6 +-
 tools/perf/arch/x86/tests/hybrid.c      |   7 +-
 tools/perf/arch/x86/util/auxtrace.c     |   5 +-
 tools/perf/arch/x86/util/evlist.c       |  25 +-
 tools/perf/arch/x86/util/evsel.c        |  27 +-
 tools/perf/arch/x86/util/intel-bts.c    |   4 +-
 tools/perf/arch/x86/util/intel-pt.c     |   4 +-
 tools/perf/arch/x86/util/mem-events.c   |  17 +-
 tools/perf/arch/x86/util/perf_regs.c    |  15 +-
 tools/perf/arch/x86/util/topdown.c      |   5 +-
 tools/perf/bench/pmu-scan.c             |  60 +--
 tools/perf/builtin-c2c.c                |   9 +-
 tools/perf/builtin-list.c               |   4 +-
 tools/perf/builtin-mem.c                |   9 +-
 tools/perf/builtin-record.c             |  29 +-
 tools/perf/builtin-stat.c               |  14 +-
 tools/perf/builtin-top.c                |  10 +-
 tools/perf/tests/attr.c                 |  11 +-
 tools/perf/tests/builtin-test.c         |   4 +-
 tools/perf/tests/cpumap.c               |  92 ++++-
 tools/perf/tests/event_groups.c         |   7 +-
 tools/perf/tests/parse-events.c         |  15 +-
 tools/perf/tests/parse-metric.c         |   9 +-
 tools/perf/tests/pmu-events.c           |   6 +-
 tools/perf/tests/switch-tracking.c      |  14 +-
 tools/perf/tests/tests.h                |   4 +-
 tools/perf/tests/topology.c             |  16 +-
 tools/perf/util/Build                   |   2 -
 tools/perf/util/cpumap.c                |   4 +-
 tools/perf/util/cpumap.h                |   4 +-
 tools/perf/util/cputopo.c               |  12 +-
 tools/perf/util/env.c                   |   5 +-
 tools/perf/util/evlist-hybrid.c         | 162 --------
 tools/perf/util/evlist-hybrid.h         |  15 -
 tools/perf/util/evlist.c                |  64 +++-
 tools/perf/util/evlist.h                |   9 +-
 tools/perf/util/evsel.c                 |  60 +--
 tools/perf/util/evsel.h                 |   3 -
 tools/perf/util/header.c                |  27 +-
 tools/perf/util/mem-events.c            |  25 +-
 tools/perf/util/metricgroup.c           |   9 +-
 tools/perf/util/parse-events.c          |  25 +-
 tools/perf/util/parse-events.y          |   3 +-
 tools/perf/util/pfm.c                   |   6 +-
 tools/perf/util/pmu-hybrid.c            |  52 ---
 tools/perf/util/pmu-hybrid.h            |  32 --
 tools/perf/util/pmu.c                   | 470 +-----------------------
 tools/perf/util/pmu.h                   |  25 +-
 tools/perf/util/pmus.c                  | 465 ++++++++++++++++++++++-
 tools/perf/util/pmus.h                  |  15 +-
 tools/perf/util/print-events.c          |  15 +-
 tools/perf/util/python-ext-sources      |   1 -
 tools/perf/util/stat-display.c          |  19 +-
 tools/perf/util/target.h                |   1 -
 60 files changed, 992 insertions(+), 1092 deletions(-)
 delete mode 100644 tools/perf/util/evlist-hybrid.c
 delete mode 100644 tools/perf/util/evlist-hybrid.h
 delete mode 100644 tools/perf/util/pmu-hybrid.c
 delete mode 100644 tools/perf/util/pmu-hybrid.h