linux-kernel - [PATCH V4 13/15] libperf evsel: Add comments for booleans

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Date:   Tue, 24 May 2022 10:54:34 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org
Subject: [PATCH V4 13/15] libperf evsel: Add comments for booleans

Add comments for 'system_wide' and 'requires_cpu' booleans

Acked-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/lib/perf/include/internal/evsel.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/lib/perf/include/internal/evsel.h b/tools/lib/perf/include/internal/evsel.h
index 77fbb8b97e5c..2a912a1f1989 100644
--- a/tools/lib/perf/include/internal/evsel.h
+++ b/tools/lib/perf/include/internal/evsel.h
@@ -49,7 +49,17 @@ struct perf_evsel {
 
 	/* parse modifier helper */
 	int			 nr_members;
+	/*
+	 * system_wide is for events that need to be on every CPU, irrespective
+	 * of user requested CPUs or threads. Map propagation will set cpus to
+	 * this event's own_cpus, whereby they will contribute to evlist
+	 * all_cpus.
+	 */
 	bool			 system_wide;
+	/*
+	 * Some events, for example uncore events, require a CPU.
+	 * i.e. it cannot be the 'any CPU' value of -1.
+	 */
 	bool			 requires_cpu;
 	int			 idx;
 };
-- 
2.25.1