perf stat: Add struct perf_stat_aggr to perf_stat_evsel

The perf_stat_aggr struct is to keep aggregated counter values and the
states according to the aggregation mode.  The number of entries is
depends on the mode and this is a preparation for the later use.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221018020227.85905-8-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat.c

@@ -133,15 +133,33 @@ static void perf_stat_evsel_id_init(struct evsel *evsel)
 static void evsel__reset_stat_priv(struct evsel *evsel)
 {
 	struct perf_stat_evsel *ps = evsel->stats;
+	struct perf_stat_aggr *aggr = ps->aggr;
 
 	init_stats(&ps->res_stats);
+
+	if (aggr)
+		memset(aggr, 0, sizeof(*aggr) * ps->nr_aggr);
 }
 
-static int evsel__alloc_stat_priv(struct evsel *evsel)
+
+static int evsel__alloc_stat_priv(struct evsel *evsel, int nr_aggr)
 {
-	evsel->stats = zalloc(sizeof(struct perf_stat_evsel));
-	if (evsel->stats == NULL)
+	struct perf_stat_evsel *ps;
+
+	ps = zalloc(sizeof(*ps));
+	if (ps == NULL)
 		return -ENOMEM;
+
+	if (nr_aggr) {
+		ps->nr_aggr = nr_aggr;
+		ps->aggr = calloc(nr_aggr, sizeof(*ps->aggr));
+		if (ps->aggr == NULL) {
+			free(ps);
+			return -ENOMEM;
+		}
+	}
+
+	evsel->stats = ps;
 	perf_stat_evsel_id_init(evsel);
 	evsel__reset_stat_priv(evsel);
 	return 0;
@@ -151,8 +169,10 @@ static void evsel__free_stat_priv(struct evsel *evsel)
 {
 	struct perf_stat_evsel *ps = evsel->stats;
 
-	if (ps)
+	if (ps) {
+		zfree(&ps->aggr);
 		zfree(&ps->group_data);
+	}
 	zfree(&evsel->stats);
 }
 
@@ -181,9 +201,9 @@ static void evsel__reset_prev_raw_counts(struct evsel *evsel)
 		perf_counts__reset(evsel->prev_raw_counts);
 }
 
-static int evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)
+static int evsel__alloc_stats(struct evsel *evsel, int nr_aggr, bool alloc_raw)
 {
-	if (evsel__alloc_stat_priv(evsel) < 0 ||
+	if (evsel__alloc_stat_priv(evsel, nr_aggr) < 0 ||
 	    evsel__alloc_counts(evsel) < 0 ||
 	    (alloc_raw && evsel__alloc_prev_raw_counts(evsel) < 0))
 		return -ENOMEM;
@@ -196,7 +216,7 @@ int evlist__alloc_stats(struct evlist *evlist, bool alloc_raw)
 	struct evsel *evsel;
 
 	evlist__for_each_entry(evlist, evsel) {
-		if (evsel__alloc_stats(evsel, alloc_raw))
+		if (evsel__alloc_stats(evsel, 0, alloc_raw))
 			goto out_free;
 	}
 

tools/perf/util/stat.h

@@ -8,6 +8,7 @@
 #include <sys/resource.h>
 #include "cpumap.h"
 #include "rblist.h"
+#include "counts.h"
 
 struct perf_cpu_map;
 struct perf_stat_config;
@@ -42,9 +43,27 @@ enum perf_stat_evsel_id {
 	PERF_STAT_EVSEL_ID__MAX,
 };
 
+/* hold aggregated event info */
+struct perf_stat_aggr {
+	/* aggregated values */
+	struct perf_counts_values	counts;
+	/* number of entries (CPUs) aggregated */
+	int				nr;
+	/* whether any entry has failed to read/process event */
+	bool				failed;
+};
+
+/* per-evsel event stats */
 struct perf_stat_evsel {
+	/* used for repeated runs */
 	struct stats		 res_stats;
+	/* evsel id for quick check */
 	enum perf_stat_evsel_id	 id;
+	/* number of allocated 'aggr' */
+	int			 nr_aggr;
+	/* aggregated event values */
+	struct perf_stat_aggr	*aggr;
+	/* used for group read */
 	u64			*group_data;
 };