perf stat: Add TopdownL1 metric as a default if present

When there are no events and on Intel, the topdown events will be
added by default if present. To display the metrics associated with
these request special handling in stat-shadow.c. To more easily update
these metrics use the json metric version via the TopdownL1
group. This makes the handling less platform specific.

Modify the metricgroup__has_metric code to also cover metric groups.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Link: https://lore.kernel.org/r/20230219092848.639226-40-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/util/evlist.c

@@ -59,10 +59,10 @@ int arch_evlist__add_default_attrs(struct evlist *evlist,
 				   struct perf_event_attr *attrs,
 				   size_t nr_attrs)
 {
-	if (nr_attrs)
-		return ___evlist__add_default_attrs(evlist, attrs, nr_attrs);
+	if (!nr_attrs)
+		return 0;
 
-	return topdown_parse_events(evlist);
+	return ___evlist__add_default_attrs(evlist, attrs, nr_attrs);
 }
 
 struct evsel *arch_evlist__leader(struct list_head *list)

tools/perf/arch/x86/util/topdown.c

@@ -9,11 +9,6 @@
 #include "topdown.h"
 #include "evsel.h"
 
-#define TOPDOWN_L1_EVENTS       "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}"
-#define TOPDOWN_L1_EVENTS_CORE  "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/}"
-#define TOPDOWN_L2_EVENTS       "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}"
-#define TOPDOWN_L2_EVENTS_CORE  "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/,cpu_core/topdown-heavy-ops/,cpu_core/topdown-br-mispredict/,cpu_core/topdown-fetch-lat/,cpu_core/topdown-mem-bound/}"
-
 /* Check whether there is a PMU which supports the perf metrics. */
 bool topdown_sys_has_perf_metrics(void)
 {
@@ -99,28 +94,3 @@ const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn)
 
 	return pmu_name;
 }
-
-int topdown_parse_events(struct evlist *evlist)
-{
-	const char *topdown_events;
-	const char *pmu_name;
-
-	if (!topdown_sys_has_perf_metrics())
-		return 0;
-
-	pmu_name = arch_get_topdown_pmu_name(evlist, false);
-
-	if (pmu_have_event(pmu_name, "topdown-heavy-ops")) {
-		if (!strcmp(pmu_name, "cpu_core"))
-			topdown_events = TOPDOWN_L2_EVENTS_CORE;
-		else
-			topdown_events = TOPDOWN_L2_EVENTS;
-	} else {
-		if (!strcmp(pmu_name, "cpu_core"))
-			topdown_events = TOPDOWN_L1_EVENTS_CORE;
-		else
-			topdown_events = TOPDOWN_L1_EVENTS;
-	}
-
-	return parse_event(evlist, topdown_events);
-}

tools/perf/arch/x86/util/topdown.h

@@ -3,6 +3,5 @@
 #define _TOPDOWN_H 1
 
 bool topdown_sys_has_perf_metrics(void);
-int topdown_parse_events(struct evlist *evlist);
 
 #endif

tools/perf/builtin-stat.c

@@ -1996,6 +1996,7 @@ static int add_default_attributes(void)
 		stat_config.topdown_level = TOPDOWN_MAX_LEVEL;
 
 	if (!evsel_list->core.nr_entries) {
+		/* No events so add defaults. */
 		if (target__has_cpu(&target))
 			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
 
@@ -2011,6 +2012,19 @@ static int add_default_attributes(void)
 		}
 		if (evlist__add_default_attrs(evsel_list, default_attrs1) < 0)
 			return -1;
+		/*
+		 * Add TopdownL1 metrics if they exist. To minimize
+		 * multiplexing, don't request threshold computation.
+		 */
+		if (metricgroup__has_metric("TopdownL1") &&
+		    metricgroup__parse_groups(evsel_list, "TopdownL1",
+					    /*metric_no_group=*/false,
+					    /*metric_no_merge=*/false,
+					    /*metric_no_threshold=*/true,
+					    stat_config.user_requested_cpu_list,
+					    stat_config.system_wide,
+					    &stat_config.metric_events) < 0)
+			return -1;
 		/* Platform specific attrs */
 		if (evlist__add_default_attrs(evsel_list, default_null_attrs) < 0)
 			return -1;

tools/perf/util/metricgroup.c

@@ -1647,10 +1647,8 @@ static int metricgroup__has_metric_callback(const struct pmu_metric *pm,
 {
 	const char *metric = vdata;
 
-	if (!pm->metric_expr)
-		return 0;
-
-	if (match_metric(pm->metric_name, metric))
+	if (match_metric(pm->metric_name, metric) ||
+	    match_metric(pm->metric_group, metric))
 		return 1;
 
 	return 0;