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

Jin Yao
2021-03-29T07:03:47Z

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@linux.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