Commit 3c84e65a authored Aug 12, 2019 by Adrian Hunter Committed by Arnaldo Carvalho de Melo Aug 20, 2019

perf evsel: Add comment for 'idx' member in 'struct perf_sample_id



The 'idx' member was added as preparation for AUX area sampling. Add a
comment to describe why.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/83ff264f-84c3-5372-8976-dd9293d20c6f@intel.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 0ac10d87

tools/perf/util/evsel.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,13 @@ struct perf_sample_id {
		struct hlist_node node;
		u64 id;
		struct evsel *evsel;
		/*
		* 'idx' will be used for AUX area sampling. A sample will have AUX area
		* data that will be queued for decoding, where there are separate
		* queues for each CPU (per-cpu tracing) or task (per-thread tracing).
		* The sample ID can be used to lookup 'idx' which is effectively the
		* queue number.
		*/
		int idx;
		int cpu;
		pid_t tid;

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