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. The v1 patches changed 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, the v2 patches also used it in perf_cpu_map__merge to avoid creating a new CPU map for some currently missed patterns. The reference counts for these functions is simplified as discussed here: https://lore.kernel.org/lkml/YkdOpJDnknrOPq2t@xxxxxxxxxx/ but this means users of perf_cpu_map__merge must now do a put on the 1st argument. v2. Reorders the "Avoid segv" patch and makes other adjustments suggested by Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>. v3. Modify reference count behaviour for merge and intersect. Add intersect tests and tidy thee cpu map tests suite. Ian Rogers (5): perf cpumap: Don't decrement refcnt on args to merge perf tests: Additional cpumap merge tests perf cpumap: Add intersect function. perf evlist: Respect all_cpus when setting user_requested_cpus perf test: Combine cpu map tests into 1 suite tools/lib/perf/cpumap.c | 46 ++++++++++++++--- tools/lib/perf/evlist.c | 6 ++- tools/lib/perf/include/perf/cpumap.h | 2 + tools/perf/tests/builtin-test.c | 4 +- tools/perf/tests/cpumap.c | 74 +++++++++++++++++++++++++--- tools/perf/tests/tests.h | 4 +- tools/perf/util/evlist.c | 7 +++ 7 files changed, 120 insertions(+), 23 deletions(-) -- 2.35.1.1178.g4f1659d476-goog
