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 union perf_event *event; 26 struct perf_evsel *evsel; 27 struct perf_evlist *evlist; 28 struct perf_event_attr attr = { 29 .type = PERF_TYPE_SOFTWARE, 30 .config = clock_id, 31 .sample_type = PERF_SAMPLE_PERIOD, 32 .exclude_kernel = 1, 33 .disabled = 1, 34 .freq = 1, 35 }; 36 37 attr.sample_freq = 500; 38 39 evlist = perf_evlist__new(); 40 if (evlist == NULL) { 41 pr_debug("perf_evlist__new\n"); 42 return -1; 43 } 44 45 evsel = perf_evsel__new(&attr); 46 if (evsel == NULL) { 47 pr_debug("perf_evsel__new\n"); 48 goto out_free_evlist; 49 } 50 perf_evlist__add(evlist, evsel); 51 52 evlist->cpus = cpu_map__dummy_new(); 53 evlist->threads = thread_map__new_by_tid(getpid()); 54 if (!evlist->cpus || !evlist->threads) { 55 err = -ENOMEM; 56 pr_debug("Not enough memory to create thread/cpu maps\n"); 57 goto out_delete_maps; 58 } 59 60 if (perf_evlist__open(evlist)) { 61 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate"; 62 63 err = -errno; 64 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n", 65 strerror(errno), knob, (u64)attr.sample_freq); 66 goto out_delete_maps; 67 } 68 69 err = perf_evlist__mmap(evlist, 128, true); 70 if (err < 0) { 71 pr_debug("failed to mmap event: %d (%s)\n", errno, 72 strerror(errno)); 73 goto out_close_evlist; 74 } 75 76 perf_evlist__enable(evlist); 77 78 /* collect samples */ 79 for (i = 0; i < NR_LOOPS; i++) 80 tmp++; 81 82 perf_evlist__disable(evlist); 83 84 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 85 struct perf_sample sample; 86 87 if (event->header.type != PERF_RECORD_SAMPLE) 88 goto next_event; 89 90 err = perf_evlist__parse_sample(evlist, event, &sample); 91 if (err < 0) { 92 pr_debug("Error during parse sample\n"); 93 goto out_unmap_evlist; 94 } 95 96 total_periods += sample.period; 97 nr_samples++; 98 next_event: 99 perf_evlist__mmap_consume(evlist, 0); 100 } 101 102 if ((u64) nr_samples == total_periods) { 103 pr_debug("All (%d) samples have period value of 1!\n", 104 nr_samples); 105 err = -1; 106 } 107 108 out_unmap_evlist: 109 perf_evlist__munmap(evlist); 110 out_close_evlist: 111 perf_evlist__close(evlist); 112 out_delete_maps: 113 perf_evlist__delete_maps(evlist); 114 out_free_evlist: 115 perf_evlist__delete(evlist); 116 return err; 117 } 118 119 int test__sw_clock_freq(void) 120 { 121 int ret; 122 123 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 124 if (!ret) 125 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 126 127 return ret; 128 } 129