1 #include <errno.h> 2 #include <inttypes.h> 3 #include <unistd.h> 4 #include <stdlib.h> 5 #include <signal.h> 6 #include <sys/mman.h> 7 8 #include "tests.h" 9 #include "util/evsel.h" 10 #include "util/evlist.h" 11 #include "util/cpumap.h" 12 #include "util/thread_map.h" 13 14 #define NR_LOOPS 10000000 15 16 /* 17 * This test will open software clock events (cpu-clock, task-clock) 18 * then check their frequency -> period conversion has no artifact of 19 * setting period to 1 forcefully. 20 */ 21 static int __test__sw_clock_freq(enum perf_sw_ids clock_id) 22 { 23 int i, err = -1; 24 volatile int tmp = 0; 25 u64 total_periods = 0; 26 int nr_samples = 0; 27 char sbuf[STRERR_BUFSIZE]; 28 union perf_event *event; 29 struct perf_evsel *evsel; 30 struct perf_evlist *evlist; 31 struct perf_event_attr attr = { 32 .type = PERF_TYPE_SOFTWARE, 33 .config = clock_id, 34 .sample_type = PERF_SAMPLE_PERIOD, 35 .exclude_kernel = 1, 36 .disabled = 1, 37 .freq = 1, 38 }; 39 struct cpu_map *cpus; 40 struct thread_map *threads; 41 42 attr.sample_freq = 500; 43 44 evlist = perf_evlist__new(); 45 if (evlist == NULL) { 46 pr_debug("perf_evlist__new\n"); 47 return -1; 48 } 49 50 evsel = perf_evsel__new(&attr); 51 if (evsel == NULL) { 52 pr_debug("perf_evsel__new\n"); 53 goto out_delete_evlist; 54 } 55 perf_evlist__add(evlist, evsel); 56 57 cpus = cpu_map__dummy_new(); 58 threads = thread_map__new_by_tid(getpid()); 59 if (!cpus || !threads) { 60 err = -ENOMEM; 61 pr_debug("Not enough memory to create thread/cpu maps\n"); 62 goto out_free_maps; 63 } 64 65 perf_evlist__set_maps(evlist, cpus, threads); 66 67 cpus = NULL; 68 threads = NULL; 69 70 if (perf_evlist__open(evlist)) { 71 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 72 73 err = -errno; 74 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 75 str_error_r(errno, sbuf, sizeof(sbuf)), 76 knob, (u64)attr.sample_freq); 77 goto out_delete_evlist; 78 } 79 80 err = perf_evlist__mmap(evlist, 128, true); 81 if (err < 0) { 82 pr_debug("failed to mmap event: %d (%s)\n", errno, 83 str_error_r(errno, sbuf, sizeof(sbuf))); 84 goto out_delete_evlist; 85 } 86 87 perf_evlist__enable(evlist); 88 89 /* collect samples */ 90 for (i = 0; i < NR_LOOPS; i++) 91 tmp++; 92 93 perf_evlist__disable(evlist); 94 95 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 96 struct perf_sample sample; 97 98 if (event->header.type != PERF_RECORD_SAMPLE) 99 goto next_event; 100 101 err = perf_evlist__parse_sample(evlist, event, &sample); 102 if (err < 0) { 103 pr_debug("Error during parse sample\n"); 104 goto out_delete_evlist; 105 } 106 107 total_periods += sample.period; 108 nr_samples++; 109 next_event: 110 perf_evlist__mmap_consume(evlist, 0); 111 } 112 113 if ((u64) nr_samples == total_periods) { 114 pr_debug("All (%d) samples have period value of 1!\n", 115 nr_samples); 116 err = -1; 117 } 118 119 out_free_maps: 120 cpu_map__put(cpus); 121 thread_map__put(threads); 122 out_delete_evlist: 123 perf_evlist__delete(evlist); 124 return err; 125 } 126 127 int test__sw_clock_freq(int subtest __maybe_unused) 128 { 129 int ret; 130 131 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 132 if (!ret) 133 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 134 135 return ret; 136 } 137