--- zzzz-none-000/linux-3.10.107/tools/perf/tests/sw-clock.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/tools/perf/tests/sw-clock.c	2021-02-04 17:41:59.000000000 +0000
@@ -9,7 +9,7 @@
 #include "util/cpumap.h"
 #include "util/thread_map.h"
 
-#define NR_LOOPS  1000000
+#define NR_LOOPS  10000000
 
 /*
  * This test will open software clock events (cpu-clock, task-clock)
@@ -22,6 +22,7 @@
 	volatile int tmp = 0;
 	u64 total_periods = 0;
 	int nr_samples = 0;
+	char sbuf[STRERR_BUFSIZE];
 	union perf_event *event;
 	struct perf_evsel *evsel;
 	struct perf_evlist *evlist;
@@ -33,8 +34,10 @@
 		.disabled = 1,
 		.freq = 1,
 	};
+	struct cpu_map *cpus;
+	struct thread_map *threads;
 
-	attr.sample_freq = 10000;
+	attr.sample_freq = 500;
 
 	evlist = perf_evlist__new();
 	if (evlist == NULL) {
@@ -42,28 +45,41 @@
 		return -1;
 	}
 
-	evsel = perf_evsel__new(&attr, 0);
+	evsel = perf_evsel__new(&attr);
 	if (evsel == NULL) {
 		pr_debug("perf_evsel__new\n");
-		goto out_free_evlist;
+		goto out_delete_evlist;
 	}
 	perf_evlist__add(evlist, evsel);
 
-	evlist->cpus = cpu_map__dummy_new();
-	evlist->threads = thread_map__new_by_tid(getpid());
-	if (!evlist->cpus || !evlist->threads) {
+	cpus = cpu_map__dummy_new();
+	threads = thread_map__new_by_tid(getpid());
+	if (!cpus || !threads) {
 		err = -ENOMEM;
 		pr_debug("Not enough memory to create thread/cpu maps\n");
-		goto out_delete_maps;
+		goto out_free_maps;
 	}
 
-	perf_evlist__open(evlist);
+	perf_evlist__set_maps(evlist, cpus, threads);
+
+	cpus	= NULL;
+	threads = NULL;
+
+	if (perf_evlist__open(evlist)) {
+		const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
+
+		err = -errno;
+		pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
+			 strerror_r(errno, sbuf, sizeof(sbuf)),
+			 knob, (u64)attr.sample_freq);
+		goto out_delete_evlist;
+	}
 
 	err = perf_evlist__mmap(evlist, 128, true);
 	if (err < 0) {
 		pr_debug("failed to mmap event: %d (%s)\n", errno,
-			 strerror(errno));
-		goto out_close_evlist;
+			 strerror_r(errno, sbuf, sizeof(sbuf)));
+		goto out_delete_evlist;
 	}
 
 	perf_evlist__enable(evlist);
@@ -78,16 +94,18 @@
 		struct perf_sample sample;
 
 		if (event->header.type != PERF_RECORD_SAMPLE)
-			continue;
+			goto next_event;
 
 		err = perf_evlist__parse_sample(evlist, event, &sample);
 		if (err < 0) {
 			pr_debug("Error during parse sample\n");
-			goto out_unmap_evlist;
+			goto out_delete_evlist;
 		}
 
 		total_periods += sample.period;
 		nr_samples++;
+next_event:
+		perf_evlist__mmap_consume(evlist, 0);
 	}
 
 	if ((u64) nr_samples == total_periods) {
@@ -96,13 +114,10 @@
 		err = -1;
 	}
 
-out_unmap_evlist:
-	perf_evlist__munmap(evlist);
-out_close_evlist:
-	perf_evlist__close(evlist);
-out_delete_maps:
-	perf_evlist__delete_maps(evlist);
-out_free_evlist:
+out_free_maps:
+	cpu_map__put(cpus);
+	thread_map__put(threads);
+out_delete_evlist:
 	perf_evlist__delete(evlist);
 	return err;
 }