linux-kernel - [RFC PATCH 19/25] perf stat: Handle grouping method fall back in hardware-grouping

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Date:   Sun, 24 Sep 2023 23:18:18 -0700
From:   weilin.wang@...el.com
To:     weilin.wang@...el.com, Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Mark Rutland <mark.rutland@....com>
Subject: [RFC PATCH 19/25] perf stat: Handle grouping method fall back in hardware-grouping

From: Weilin Wang <weilin.wang@...el.com>

Add fall back to normal grouping when hardware aware grouping return with
err so that perf stat still executes and returns with correct result.

Signed-off-by: Weilin Wang <weilin.wang@...el.com>
---
 tools/perf/util/metricgroup.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 1086da84c..c027c0351 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -2054,7 +2054,7 @@ static int create_grouping(struct list_head *pmu_info_list,
 	LIST_HEAD(groups);
 	char *bit_buf = malloc(NR_COUNTERS);
 
-	//TODO: for each new core group, we should consider to add events that uses fixed counters
+	//TODO: for each new core group, we could consider to add events that uses fixed counters
 	list_for_each_entry(e, event_info_list, nd) {
 		bitmap_scnprintf(e->counters, NR_COUNTERS, bit_buf, NR_COUNTERS);
 		pr_debug("Event name %s, [pmu]=%s, [counters]=%s, [taken_alone]=%d\n",
@@ -2573,13 +2573,15 @@ int metricgroup__parse_groups(struct evlist *perf_evlist,
 	if (!table)
 		return -EINVAL;
 	if (hardware_aware_grouping) {
+		int ret;
 		pr_debug("Use hardware aware grouping instead of traditional metric grouping method\n");
-		return hw_aware_parse_groups(perf_evlist, pmu, str,
+		ret = hw_aware_parse_groups(perf_evlist, pmu, str,
 			    metric_no_threshold, user_requested_cpu_list, system_wide,
 			    /*fake_pmu=*/NULL, metric_events, table);
+		if (!ret)
+			return 0;
 	}
 
-
 	return parse_groups(perf_evlist, pmu, str, metric_no_group, metric_no_merge,
 			    metric_no_threshold, user_requested_cpu_list, system_wide,
 			    /*fake_pmu=*/NULL, metric_events, table);
-- 
2.39.3