linux-kernel - [PATCH 2/2] perf parse-events: Remove "not supported" hybrid cache events

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Date:   Thu, 22 Sep 2022 09:49:04 +0800
From:   zhengjun.xing@...ux.intel.com
To:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...el.com, jolsa@...nel.org, namhyung@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        irogers@...gle.com, ak@...ux.intel.com, kan.liang@...ux.intel.com,
        zhengjun.xing@...ux.intel.com
Subject: [PATCH 2/2] perf parse-events: Remove "not supported" hybrid cache events

From: Zhengjun Xing <zhengjun.xing@...ux.intel.com>

By default, we create two hybrid cache events, one is for cpu_core, and
another is for cpu_atom. But Some hybrid hardware cache events are only
available on one CPU PMU. For example, the 'L1-dcache-load-misses' is only
available on cpu_core, while the 'L1-icache-loads' is only available on
cpu_atom. We need to remove "not supported" hybrid cache events. By
extending is_event_supported() to global API and using it to check if the
hybrid cache events are supported before being created, we can remove the
"not supported" hybrid cache events.

Before:

 # ./perf stat -e L1-dcache-load-misses,L1-icache-loads -a sleep 1

 Performance counter stats for 'system wide':

            52,570      cpu_core/L1-dcache-load-misses/
   <not supported>      cpu_atom/L1-dcache-load-misses/
   <not supported>      cpu_core/L1-icache-loads/
         1,471,817      cpu_atom/L1-icache-loads/

       1.004915229 seconds time elapsed

After:

 # ./perf stat -e L1-dcache-load-misses,L1-icache-loads -a sleep 1

 Performance counter stats for 'system wide':

            54,510      cpu_core/L1-dcache-load-misses/
         1,441,286      cpu_atom/L1-icache-loads/

       1.005114281 seconds time elapsed

Fixes: 30def61f64ba ("perf parse-events: Create two hybrid cache events")
Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/perf/util/parse-events-hybrid.c | 8 +++++++-
 tools/perf/util/print-events.c        | 2 +-
 tools/perf/util/print-events.h        | 3 ++-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/parse-events-hybrid.c b/tools/perf/util/parse-events-hybrid.c
index 284f8eabd3b9..cf2e1c2e968f 100644
--- a/tools/perf/util/parse-events-hybrid.c
+++ b/tools/perf/util/parse-events-hybrid.c
@@ -14,6 +14,7 @@
 #include "pmu.h"
 #include "pmu-hybrid.h"
 #include "perf.h"
+#include "print-events.h"
 
 static void config_hybrid_attr(struct perf_event_attr *attr,
 			       int type, int pmu_type)
@@ -48,13 +49,18 @@ static int create_event_hybrid(__u32 config_type, int *idx,
 	__u64 config = attr->config;
 
 	config_hybrid_attr(attr, config_type, pmu->type);
+
+	if (attr->type == PERF_TYPE_HW_CACHE
+	    && !is_event_supported(attr->type, attr->config))
+		goto out;
+
 	evsel = parse_events__add_event_hybrid(list, idx, attr, name, metric_id,
 					       pmu, config_terms);
 	if (evsel)
 		evsel->pmu_name = strdup(pmu->name);
 	else
 		return -ENOMEM;
-
+out:
 	attr->type = type;
 	attr->config = config;
 	return 0;
diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index 04050d4f6db8..fa5cc94cfcfe 100644
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -239,7 +239,7 @@ void print_sdt_events(const char *subsys_glob, const char *event_glob,
 	strlist__delete(sdtlist);
 }
 
-static bool is_event_supported(u8 type, u64 config)
+bool is_event_supported(u8 type, u64 config)
 {
 	bool ret = true;
 	int open_return;
diff --git a/tools/perf/util/print-events.h b/tools/perf/util/print-events.h
index 1da9910d83a6..ad2902fd0507 100644
--- a/tools/perf/util/print-events.h
+++ b/tools/perf/util/print-events.h
@@ -1,14 +1,15 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __PERF_PRINT_EVENTS_H
 #define __PERF_PRINT_EVENTS_H
-
 #include <stdbool.h>
+#include <linux/types.h>
 
 struct event_symbol;
 
 void print_events(const char *event_glob, bool name_only, bool quiet_flag,
 		  bool long_desc, bool details_flag, bool deprecated,
 		  const char *pmu_name);
+bool is_event_supported(u8 type, u64 config);
 int print_hwcache_events(const char *event_glob, bool name_only);
 void print_sdt_events(const char *subsys_glob, const char *event_glob,
 		      bool name_only);
-- 
2.25.1