linux-kernel - [PATCH V2 3/5] perf record: Add new option to sample identifier

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Date:   Wed, 15 Jun 2022 08:25:11 +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>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2 3/5] perf record: Add new option to sample identifier

In preparation for recording sideband events in a virtual machine guest so
that they can be injected into a host perf.data file.

Add an option to always include sample type PERF_SAMPLE_IDENTIFIER.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---


Changes in V2:

	Extend documntation for --sample-identifier


 tools/perf/Documentation/perf-record.txt | 5 +++++
 tools/perf/builtin-record.c              | 2 ++
 tools/perf/util/record.c                 | 2 +-
 tools/perf/util/record.h                 | 1 +
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index cf8ad50f3de1..6bd6d07021ba 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -313,6 +313,11 @@ OPTIONS
 --sample-cpu::
 	Record the sample cpu.
 
+--sample-identifier::
+	Record the sample identifier i.e. PERF_SAMPLE_IDENTIFIER bit set in
+	the sample_type member of the struct perf_event_attr argument to the
+	perf_event_open system call.
+
 -n::
 --no-samples::
 	Don't sample.
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 00c2a6cdf1be..40dca1fba4e3 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -3191,6 +3191,8 @@ static struct option __record_options[] = {
 	OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
 		    "Record the sampled code address (ip) page size"),
 	OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
+	OPT_BOOLEAN(0, "sample-identifier", &record.opts.sample_identifier,
+		    "Record the sample identifier"),
 	OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
 			&record.opts.sample_time_set,
 			"Record the sample timestamps"),
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index 5b09ecbb05dc..b529636ab3ea 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -121,7 +121,7 @@ void evlist__config(struct evlist *evlist, struct record_opts *opts, struct call
 	evlist__for_each_entry(evlist, evsel)
 		evsel__config_leader_sampling(evsel, evlist);
 
-	if (opts->full_auxtrace) {
+	if (opts->full_auxtrace || opts->sample_identifier) {
 		/*
 		 * Need to be able to synthesize and parse selected events with
 		 * arbitrary sample types, which requires always being able to
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index be9a957501f4..4269e916f450 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -28,6 +28,7 @@ struct record_opts {
 	bool	      sample_time;
 	bool	      sample_time_set;
 	bool	      sample_cpu;
+	bool	      sample_identifier;
 	bool	      period;
 	bool	      period_set;
 	bool	      running_time;
-- 
2.25.1