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 1000000 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 = 10000; 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, 0); 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 perf_evlist__open(evlist); 61 62 err = perf_evlist__mmap(evlist, 128, true); 63 if (err < 0) { 64 pr_debug("failed to mmap event: %d (%s)\n", errno, 65 strerror(errno)); 66 goto out_close_evlist; 67 } 68 69 perf_evlist__enable(evlist); 70 71 /* collect samples */ 72 for (i = 0; i < NR_LOOPS; i++) 73 tmp++; 74 75 perf_evlist__disable(evlist); 76 77 while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) { 78 struct perf_sample sample; 79 80 if (event->header.type != PERF_RECORD_SAMPLE) 81 continue; 82 83 err = perf_evlist__parse_sample(evlist, event, &sample); 84 if (err < 0) { 85 pr_debug("Error during parse sample\n"); 86 goto out_unmap_evlist; 87 } 88 89 total_periods += sample.period; 90 nr_samples++; 91 } 92 93 if ((u64) nr_samples == total_periods) { 94 pr_debug("All (%d) samples have period value of 1!\n", 95 nr_samples); 96 err = -1; 97 } 98 99 out_unmap_evlist: 100 perf_evlist__munmap(evlist); 101 out_close_evlist: 102 perf_evlist__close(evlist); 103 out_delete_maps: 104 perf_evlist__delete_maps(evlist); 105 out_free_evlist: 106 perf_evlist__delete(evlist); 107 return err; 108 } 109 110 int test__sw_clock_freq(void) 111 { 112 int ret; 113 114 ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK); 115 if (!ret) 116 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK); 117 118 return ret; 119 } 120