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Linux/tools/perf/tests/sw-clock.c

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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  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(int subtest __maybe_unused)
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 

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