linux-kernel - [PATCH v3 07/27] perf stat: Uniquify hybrid event name

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Date:   Mon, 29 Mar 2021 15:00:26 +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 07/27] perf stat: Uniquify hybrid event name

It would be useful to tell user the pmu which the event belongs to.
perf-stat has supported '--no-merge' option and it can print the pmu
name after the event name, such as:

"cycles [cpu_core]"

Now this option is enabled by default for hybrid platform but change
the format to:

"cpu_core/cycles/"

Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
v3:
 - No functional change.

 tools/perf/builtin-stat.c      |  4 ++++
 tools/perf/util/stat-display.c | 13 +++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 4bb48c6b6698..7b2dfe21c5a8 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -68,6 +68,7 @@
 #include "util/affinity.h"
 #include "util/pfm.h"
 #include "util/bpf_counter.h"
+#include "util/pmu-hybrid.h"
 #include "asm/bug.h"
 
 #include <linux/time64.h>
@@ -2371,6 +2372,9 @@ int cmd_stat(int argc, const char **argv)
 
 	evlist__check_cpu_maps(evsel_list);
 
+	if (perf_pmu__has_hybrid())
+		stat_config.no_merge = true;
+
 	/*
 	 * Initialize thread_map with comm names,
 	 * so we could print it out on output.
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 7f09cdaf5b60..161826938a00 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -17,6 +17,7 @@
 #include "cgroup.h"
 #include <api/fs/fs.h>
 #include "util.h"
+#include "pmu-hybrid.h"
 
 #define CNTR_NOT_SUPPORTED	"<not supported>"
 #define CNTR_NOT_COUNTED	"<not counted>"
@@ -526,6 +527,7 @@ static void uniquify_event_name(struct evsel *counter)
 {
 	char *new_name;
 	char *config;
+	int ret;
 
 	if (counter->uniquified_name ||
 	    !counter->pmu_name || !strncmp(counter->name, counter->pmu_name,
@@ -540,8 +542,15 @@ static void uniquify_event_name(struct evsel *counter)
 			counter->name = new_name;
 		}
 	} else {
-		if (asprintf(&new_name,
-			     "%s [%s]", counter->name, counter->pmu_name) > 0) {
+		if (perf_pmu__has_hybrid()) {
+			ret = asprintf(&new_name, "%s/%s/",
+				       counter->pmu_name, counter->name);
+		} else {
+			ret = asprintf(&new_name, "%s [%s]",
+				       counter->name, counter->pmu_name);
+		}
+
+		if (ret) {
 			free(counter->name);
 			counter->name = new_name;
 		}
-- 
2.17.1