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From:   Namhyung Kim <namhyung@kernel.org>
Date:   Wed, 13 Dec 2023 15:29:23 -0800
Message-ID: <CAM9d7civJ00iRmJ3CFfFcKteOLDaBY9tFkMTLi8vgjHipuBB1g@mail.gmail.com>
Subject: Re: [PATCH v1 00/14] Clean up libperf cpumap's empty function
To:     Ian Rogers <irogers@google.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
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On Tue, Nov 28, 2023 at 10:02 PM Ian Rogers <irogers@google.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.
>
> Ian Rogers (14):
>   libperf cpumap: Rename perf_cpu_map__dummy_new
>   libperf cpumap: Rename and prefer sysfs for perf_cpu_map__default_new
>   libperf cpumap: Rename perf_cpu_map__empty
>   libperf cpumap: Replace usage of perf_cpu_map__new(NULL)
>   libperf cpumap: Add for_each_cpu that skips the "any CPU" case
>   libperf cpumap: Add any, empty and min helpers
>   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 top: Avoid repeated function calls
>   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
>   libperf cpumap: Document perf_cpu_map__nr's behavior

Acked-by: Namhyung Kim <namhyung@kernel.org>

Thanks,
Namhyung