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