Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / testing / selftests / powerpc / pmu / count_instructions.c

diff --git a/kernel/tools/testing/selftests/powerpc/pmu/count_instructions.c b/kernel/tools/testing/selftests/powerpc/pmu/count_instructions.c
new file mode 100644 (file)
index 0000000..4622117
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/pmu/count_instructions.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright 2013, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/prctl.h>
+
+#include "event.h"
+#include "utils.h"
+#include "lib.h"
+
+extern void thirty_two_instruction_loop(u64 loops);
+
+static void setup_event(struct event *e, u64 config, char *name)
+{
+       event_init_opts(e, config, PERF_TYPE_HARDWARE, name);
+
+       e->attr.disabled = 1;
+       e->attr.exclude_kernel = 1;
+       e->attr.exclude_hv = 1;
+       e->attr.exclude_idle = 1;
+}
+
+static int do_count_loop(struct event *events, u64 instructions,
+                        u64 overhead, bool report)
+{
+       s64 difference, expected;
+       double percentage;
+
+       prctl(PR_TASK_PERF_EVENTS_ENABLE);
+
+       /* Run for 1M instructions */
+       thirty_two_instruction_loop(instructions >> 5);
+
+       prctl(PR_TASK_PERF_EVENTS_DISABLE);
+
+       event_read(&events[0]);
+       event_read(&events[1]);
+
+       expected = instructions + overhead;
+       difference = events[0].result.value - expected;
+       percentage = (double)difference / events[0].result.value * 100;
+
+       if (report) {
+               event_report(&events[0]);
+               event_report(&events[1]);
+
+               printf("Looped for %llu instructions, overhead %llu\n", instructions, overhead);
+               printf("Expected %llu\n", expected);
+               printf("Actual   %llu\n", events[0].result.value);
+               printf("Delta    %lld, %f%%\n", difference, percentage);
+       }
+
+       event_reset(&events[0]);
+       event_reset(&events[1]);
+
+       if (difference < 0)
+               difference = -difference;
+
+       /* Tolerate a difference below 0.0001 % */
+       difference *= 10000 * 100;
+       if (difference / events[0].result.value)
+               return -1;
+
+       return 0;
+}
+
+/* Count how many instructions it takes to do a null loop */
+static u64 determine_overhead(struct event *events)
+{
+       u64 current, overhead;
+       int i;
+
+       do_count_loop(events, 0, 0, false);
+       overhead = events[0].result.value;
+
+       for (i = 0; i < 100; i++) {
+               do_count_loop(events, 0, 0, false);
+               current = events[0].result.value;
+               if (current < overhead) {
+                       printf("Replacing overhead %llu with %llu\n", overhead, current);
+                       overhead = current;
+               }
+       }
+
+       return overhead;
+}
+
+static int test_body(void)
+{
+       struct event events[2];
+       u64 overhead;
+
+       setup_event(&events[0], PERF_COUNT_HW_INSTRUCTIONS, "instructions");
+       setup_event(&events[1], PERF_COUNT_HW_CPU_CYCLES, "cycles");
+
+       if (event_open(&events[0])) {
+               perror("perf_event_open");
+               return -1;
+       }
+
+       if (event_open_with_group(&events[1], events[0].fd)) {
+               perror("perf_event_open");
+               return -1;
+       }
+
+       overhead = determine_overhead(events);
+       printf("Overhead of null loop: %llu instructions\n", overhead);
+
+       /* Run for 1Mi instructions */
+       FAIL_IF(do_count_loop(events, 1000000, overhead, true));
+
+       /* Run for 10Mi instructions */
+       FAIL_IF(do_count_loop(events, 10000000, overhead, true));
+
+       /* Run for 100Mi instructions */
+       FAIL_IF(do_count_loop(events, 100000000, overhead, true));
+
+       /* Run for 1Bi instructions */
+       FAIL_IF(do_count_loop(events, 1000000000, overhead, true));
+
+       /* Run for 16Bi instructions */
+       FAIL_IF(do_count_loop(events, 16000000000, overhead, true));
+
+       /* Run for 64Bi instructions */
+       FAIL_IF(do_count_loop(events, 64000000000, overhead, true));
+
+       event_close(&events[0]);
+       event_close(&events[1]);
+
+       return 0;
+}
+
+static int count_instructions(void)
+{
+       return eat_cpu(test_body);
+}
+
+int main(void)
+{
+       return test_harness(count_instructions, "count_instructions");
+}