linux-kernel - [PATCH v3 18/27] perf record: Uniquify hybrid event name

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Date:   Mon, 29 Mar 2021 15:00:37 +0800
From:   Jin Yao <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH v3 18/27] perf record: Uniquify hybrid event name

For perf-record, it would be useful to tell user the pmu which the
event belongs to.

For example,

  # perf record -a -- sleep 1
  # perf report

  # To display the perf.data header info, please use --header/--header-only options.
  #
  #
  # Total Lost Samples: 0
  #
  # Samples: 106  of event 'cpu_core/cycles/'
  # Event count (approx.): 22043448
  #
  # Overhead  Command       Shared Object            Symbol
  # ........  ............  .......................  ............................
  #
  ...

Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
v3:
 - New patch in v3.

 tools/perf/builtin-record.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 1b44b1a8636e..74cc9ffbd9ef 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1605,6 +1605,32 @@ static void hit_auxtrace_snapshot_trigger(struct record *rec)
 	}
 }
 
+static void record__uniquify_name(struct record *rec)
+{
+	struct evsel *pos;
+	struct evlist *evlist = rec->evlist;
+	char *new_name;
+	int ret;
+
+	if (!perf_pmu__has_hybrid())
+		return;
+
+	evlist__for_each_entry(evlist, pos) {
+		if (!evsel__is_hybrid(pos))
+			continue;
+
+		if (strchr(pos->name, '/'))
+			continue;
+
+		ret = asprintf(&new_name, "%s/%s/",
+			       pos->pmu_name, pos->name);
+		if (ret) {
+			free(pos->name);
+			pos->name = new_name;
+		}
+	}
+}
+
 static int __cmd_record(struct record *rec, int argc, const char **argv)
 {
 	int err;
@@ -1709,6 +1735,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 	if (data->is_pipe && rec->evlist->core.nr_entries == 1)
 		rec->opts.sample_id = true;
 
+	record__uniquify_name(rec);
+
 	if (record__open(rec) != 0) {
 		err = -1;
 		goto out_child;
-- 
2.17.1