linux-kernel - [PATCH v2 0/8] Clean up libperf cpumap's empty function

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Date: Wed, 31 Jan 2024 20:22:28 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>, 
	Adrian Hunter <adrian.hunter@...el.com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@....com>, 
	Leo Yan <leo.yan@...aro.org>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Darren Hart <dvhart@...radead.org>, 
	Davidlohr Bueso <dave@...olabs.net>, 
	"André Almeida" <andrealmeid@...lia.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	K Prateek Nayak <kprateek.nayak@....com>, Sean Christopherson <seanjc@...gle.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Kajol Jain <kjain@...ux.ibm.com>, 
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, Andrew Jones <ajones@...tanamicro.com>, 
	Alexandre Ghiti <alexghiti@...osinc.com>, Atish Patra <atishp@...osinc.com>, 
	"Steinar H. Gunderson" <sesse@...gle.com>, Yang Jihong <yangjihong1@...wei.com>, 
	Yang Li <yang.lee@...ux.alibaba.com>, Changbin Du <changbin.du@...wei.com>, 
	Sandipan Das <sandipan.das@....com>, Ravi Bangoria <ravi.bangoria@....com>, 
	Paran Lee <p4ranlee@...il.com>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Huacai Chen <chenhuacai@...nel.org>, Yanteng Si <siyanteng@...ngson.cn>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
	bpf@...r.kernel.org
Subject: [PATCH v2 0/8] Clean up libperf cpumap's empty function

Rename and clean up the use of libperf CPU map functions particularly
focussing on perf_cpu_map__empty that may return true for maps
containing CPUs but also with an "any CPU"/dummy value.

perf_cpu_map__nr is also troubling in that iterating an empty CPU map
will yield the "any CPU"/dummy value. Reduce the appearance of some
calls to this by using the perf_cpu_map__for_each_cpu macro.

v2: 6 patches were merged by Arnaldo. New patch added ensure empty
    maps are allocated as NULL (suggested by James Clark). Hopefully a
    fix to "perf arm-spe/cs-etm: Directly iterate CPU maps".

Ian Rogers (8):
  libperf cpumap: Add any, empty and min helpers
  libperf cpumap: Ensure empty cpumap is NULL from alloc
  perf arm-spe/cs-etm: Directly iterate CPU maps
  perf intel-pt/intel-bts: Switch perf_cpu_map__has_any_cpu_or_is_empty
    use
  perf cpumap: Clean up use of perf_cpu_map__has_any_cpu_or_is_empty
  perf arm64 header: Remove unnecessary CPU map get and put
  perf stat: Remove duplicate cpus_map_matched function
  perf cpumap: Use perf_cpu_map__for_each_cpu when possible

 tools/lib/perf/cpumap.c                       | 33 +++++++-
 tools/lib/perf/include/perf/cpumap.h          | 16 ++++
 tools/lib/perf/libperf.map                    |  4 +
 tools/perf/arch/arm/util/cs-etm.c             | 77 ++++++++-----------
 tools/perf/arch/arm64/util/arm-spe.c          |  4 +-
 tools/perf/arch/arm64/util/header.c           | 13 +---
 tools/perf/arch/x86/util/intel-bts.c          |  4 +-
 tools/perf/arch/x86/util/intel-pt.c           | 10 +--
 tools/perf/builtin-c2c.c                      |  6 +-
 tools/perf/builtin-stat.c                     | 31 ++------
 tools/perf/tests/bitmap.c                     | 13 ++--
 tools/perf/tests/topology.c                   | 46 +++++------
 tools/perf/util/auxtrace.c                    |  4 +-
 tools/perf/util/bpf_kwork.c                   | 16 ++--
 tools/perf/util/bpf_kwork_top.c               | 12 +--
 tools/perf/util/cpumap.c                      | 12 ++-
 tools/perf/util/record.c                      |  2 +-
 .../scripting-engines/trace-event-python.c    | 12 +--
 tools/perf/util/session.c                     |  5 +-
 tools/perf/util/stat.c                        |  2 +-
 tools/perf/util/svghelper.c                   | 20 +++--
 21 files changed, 175 insertions(+), 167 deletions(-)

-- 
2.43.0.429.g432eaa2c6b-goog