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      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 			goto next_event;
     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 next_event:
     92 		perf_evlist__mmap_consume(evlist, 0);
     93 	}
     94 
     95 	if ((u64) nr_samples == total_periods) {
     96 		pr_debug("All (%d) samples have period value of 1!\n",
     97 			 nr_samples);
     98 		err = -1;
     99 	}
    100 
    101 out_unmap_evlist:
    102 	perf_evlist__munmap(evlist);
    103 out_close_evlist:
    104 	perf_evlist__close(evlist);
    105 out_delete_maps:
    106 	perf_evlist__delete_maps(evlist);
    107 out_free_evlist:
    108 	perf_evlist__delete(evlist);
    109 	return err;
    110 }
    111 
    112 int test__sw_clock_freq(void)
    113 {
    114 	int ret;
    115 
    116 	ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
    117 	if (!ret)
    118 		ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
    119 
    120 	return ret;
    121 }
    122