perf counts: Reset prev_raw_counts counts

When we want to reset the evsel->prev_raw_counts, zeroing the aggr is
not enough, we need to reset the perf_counts too.

The perf_counts__reset zeros the perf_counts, and it should zero the
aggr too. This patch changes perf_counts__reset to non-static, and calls
it in evsel__reset_prev_raw_counts to reset the prev_raw_counts.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200520042737.24160-3-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/counts.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <errno.h>
 #include <stdlib.h>
+#include <string.h>
 #include "evsel.h"
 #include "counts.h"
 #include <linux/zalloc.h>
@@ -42,10 +43,11 @@ void perf_counts__delete(struct perf_counts *counts)
 	}
 }
 
-static void perf_counts__reset(struct perf_counts *counts)
+void perf_counts__reset(struct perf_counts *counts)
 {
 	xyarray__reset(counts->loaded);
 	xyarray__reset(counts->values);
+	memset(&counts->aggr, 0, sizeof(struct perf_counts_values));
 }
 
 void evsel__reset_counts(struct evsel *evsel)

tools/perf/util/counts.h

@@ -37,6 +37,7 @@ perf_counts__set_loaded(struct perf_counts *counts, int cpu, int thread, bool lo
 
 struct perf_counts *perf_counts__new(int ncpus, int nthreads);
 void perf_counts__delete(struct perf_counts *counts);
+void perf_counts__reset(struct perf_counts *counts);
 
 void evsel__reset_counts(struct evsel *evsel);
 int evsel__alloc_counts(struct evsel *evsel, int ncpus, int nthreads);

tools/perf/util/stat.c

@@ -163,11 +163,8 @@ static void evsel__free_prev_raw_counts(struct evsel *evsel)
 
 static void evsel__reset_prev_raw_counts(struct evsel *evsel)
 {
-	if (evsel->prev_raw_counts) {
-		evsel->prev_raw_counts->aggr.val = 0;
-		evsel->prev_raw_counts->aggr.ena = 0;
-		evsel->prev_raw_counts->aggr.run = 0;
-       }
+	if (evsel->prev_raw_counts)
+		perf_counts__reset(evsel->prev_raw_counts);
 }
 
 static int evsel__alloc_stats(struct evsel *evsel, bool alloc_raw)