[PATCH v2 0/6] Make evlist CPUs more accurate

[Ian Rogers]

evlist has all_cpus, computed to be the merge of all evsel CPU maps,
and cpus. cpus may contain more CPUs than all_cpus, as by default cpus
holds all online CPUs whilst all_cpus holds the merge/union from
evsels. For an uncore event there may just be 1 CPU per socket, which
will be a far smaller CPU map than all online CPUs.

These patches change cpus to be called user_requested_cpus, to reflect
their potential user specified nature. The user_requested_cpus are set
to be the current value intersected with all_cpus, so that
user_requested_cpus is always a subset of all_cpus. This fixes
printing code for metrics so that unnecessary blank lines aren't
printed.

To make the intersect function perform well, a perf_cpu_map__is_subset
function is added. While adding this function, also use it in
perf_cpu_map__merge to avoid creating a new CPU map for some currently
missed patterns.

v2. Reorders the "Avoid segv" patch and makes other adjustments
    suggested by Arnaldo Carvalho de Melo <acme at kernel.org>.

Ian Rogers (6):
  perf stat: Avoid segv if core.user_cpus isn't set.
  perf evlist: Rename cpus to user_requested_cpus
  perf cpumap: Add is_subset function
  perf cpumap: More cpu map reuse by merge.
  perf cpumap: Add intersect function.
  perf evlist: Respect all_cpus when setting user_requested_cpus

 tools/lib/perf/cpumap.c                  | 73 ++++++++++++++++++++----
 tools/lib/perf/evlist.c                  | 28 ++++-----
 tools/lib/perf/include/internal/cpumap.h |  1 +
 tools/lib/perf/include/internal/evlist.h |  7 ++-
 tools/lib/perf/include/perf/cpumap.h     |  2 +
 tools/perf/arch/arm/util/cs-etm.c        |  8 +--
 tools/perf/arch/arm64/util/arm-spe.c     |  2 +-
 tools/perf/arch/x86/util/intel-bts.c     |  2 +-
 tools/perf/arch/x86/util/intel-pt.c      |  4 +-
 tools/perf/bench/evlist-open-close.c     |  2 +-
 tools/perf/builtin-ftrace.c              |  2 +-
 tools/perf/builtin-record.c              |  6 +-
 tools/perf/builtin-stat.c                | 11 ++--
 tools/perf/builtin-top.c                 |  2 +-
 tools/perf/util/auxtrace.c               |  2 +-
 tools/perf/util/bpf_ftrace.c             |  4 +-
 tools/perf/util/evlist.c                 | 17 +++---
 tools/perf/util/record.c                 |  6 +-
 tools/perf/util/sideband_evlist.c        |  3 +-
 tools/perf/util/stat-display.c           |  2 +-
 tools/perf/util/synthetic-events.c       |  2 +-
 tools/perf/util/top.c                    |  8 ++-
 22 files changed, 132 insertions(+), 62 deletions(-)

-- 
2.35.1.1021.g381101b075-goog