linux-kernel - Re: [PATCH v3 0/8] Clean up libperf cpumap's empty function

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Date: Wed, 14 Feb 2024 14:02:44 -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: Re: [PATCH v3 0/8] Clean up libperf cpumap's empty function

On Fri, Feb 2, 2024 at 3:41 PM Ian Rogers <irogers@...gle.com> wrote:
>
> 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.
>
> v3: Address handling of "any" is arm-spe/cs-etm patch.
> 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

Ping. Thanks,
Ian

>  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             | 114 ++++++++----------
>  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, 192 insertions(+), 187 deletions(-)
>
> --
> 2.43.0.594.gd9cf4e227d-goog
>