linux-kernel - Re: [PATCH v1 14/14] libperf cpumap: Document perf_cpu_map_

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Date: Mon, 18 Dec 2023 17:36:39 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: James Clark <james.clark@....com>
Cc: Ian Rogers <irogers@...gle.com>, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>, 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>,
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	Alexandre Ghiti <alexghiti@...osinc.com>,
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	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 v1 14/14] libperf cpumap: Document perf_cpu_map__nr's
 behavior

Em Tue, Dec 12, 2023 at 03:20:47PM +0000, James Clark escreveu:
> On 29/11/2023 06:02, Ian Rogers wrote:
> >  LIBPERF_API void perf_cpu_map__put(struct perf_cpu_map *map);
> > +/**
> > + * perf_cpu_map__cpu - get the CPU value at the given index. Returns -1 if index
> > + *                     is invalid.
> > + */
> >  LIBPERF_API struct perf_cpu perf_cpu_map__cpu(const struct perf_cpu_map *cpus, int idx);
> > +/**
> > + * perf_cpu_map__nr - for an empty map returns 1, as perf_cpu_map__cpu returns a
> > + *                    cpu of -1 for an invalid index, this makes an empty map
> > + *                    look like it contains the "any CPU"/dummy value. Otherwise
> > + *                    the result is the number CPUs in the map plus one if the
> > + *                    "any CPU"/dummy value is present.
> 
> Hmmm... I'm not sure whether to laugh or cry at that API.
> 
> Reviewed-by: James Clark <james.clark@....com>



Thanks, applied to perf-tools-next.

- Arnaldo