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