tools/perf/tests/perf-time-to-tsc.c

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <linux/types.h>
   4 #include <sys/prctl.h>
   5
   6 #include "parse-events.h"
   7 #include "evlist.h"
   8 #include "evsel.h"
   9 #include "thread_map.h"
  10 #include "cpumap.h"
  11 #include "tsc.h"
  12 #include "tests.h"
  13
  14 #define CHECK__(x) {                            \
  15         while ((x) < 0) {                       \
  16                 pr_debug(#x " failed!\n");      \
  17                 goto out_err;                   \
  18         }                                       \
  19 }
  20
  21 #define CHECK_NOT_NULL__(x) {                   \
  22         while ((x) == NULL) {                   \
  23                 pr_debug(#x " failed!\n");      \
  24                 goto out_err;                   \
  25         }                                       \
  26 }
  27
  28 /**
  29  * test__perf_time_to_tsc - test converting perf time to TSC.
  30  *
  31  * This function implements a test that checks that the conversion of perf time
  32  * to and from TSC is consistent with the order of events.  If the test passes
  33  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
  34  * supported then then the test passes but " (not supported)" is printed.
  35  */
  36 int test__perf_time_to_tsc(void)
  37 {
  38         struct record_opts opts = {
  39                 .mmap_pages          = UINT_MAX,
  40                 .user_freq           = UINT_MAX,
  41                 .user_interval       = ULLONG_MAX,
  42                 .freq                = 4000,
  43                 .target              = {
  44                         .uses_mmap   = true,
  45                 },
  46                 .sample_time         = true,
  47         };
  48         struct thread_map *threads = NULL;
  49         struct cpu_map *cpus = NULL;
  50         struct perf_evlist *evlist = NULL;
  51         struct perf_evsel *evsel = NULL;
  52         int err = -1, ret, i;
  53         const char *comm1, *comm2;
  54         struct perf_tsc_conversion tc;
  55         struct perf_event_mmap_page *pc;
  56         union perf_event *event;
  57         u64 test_tsc, comm1_tsc, comm2_tsc;
  58         u64 test_time, comm1_time = 0, comm2_time = 0;
  59
  60         threads = thread_map__new(-1, getpid(), UINT_MAX);
  61         CHECK_NOT_NULL__(threads);
  62
  63         cpus = cpu_map__new(NULL);
  64         CHECK_NOT_NULL__(cpus);
  65
  66         evlist = perf_evlist__new();
  67         CHECK_NOT_NULL__(evlist);
  68
  69         perf_evlist__set_maps(evlist, cpus, threads);
  70
  71         CHECK__(parse_events(evlist, "cycles:u", NULL));
  72
  73         perf_evlist__config(evlist, &opts);
  74
  75         evsel = perf_evlist__first(evlist);
  76
  77         evsel->attr.comm = 1;
  78         evsel->attr.disabled = 1;
  79         evsel->attr.enable_on_exec = 0;
  80
  81         CHECK__(perf_evlist__open(evlist));
  82
  83         CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
  84
  85         pc = evlist->mmap[0].base;
  86         ret = perf_read_tsc_conversion(pc, &tc);
  87         if (ret) {
  88                 if (ret == -EOPNOTSUPP) {
  89                         fprintf(stderr, " (not supported)");
  90                         return 0;
  91                 }
  92                 goto out_err;
  93         }
  94
  95         perf_evlist__enable(evlist);
  96
  97         comm1 = "Test COMM 1";
  98         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
  99
 100         test_tsc = rdtsc();
 101
 102         comm2 = "Test COMM 2";
 103         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
 104
 105         perf_evlist__disable(evlist);
 106
 107         for (i = 0; i < evlist->nr_mmaps; i++) {
 108                 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 109                         struct perf_sample sample;
 110
 111                         if (event->header.type != PERF_RECORD_COMM ||
 112                             (pid_t)event->comm.pid != getpid() ||
 113                             (pid_t)event->comm.tid != getpid())
 114                                 goto next_event;
 115
 116                         if (strcmp(event->comm.comm, comm1) == 0) {
 117                                 CHECK__(perf_evsel__parse_sample(evsel, event,
 118                                                                  &sample));
 119                                 comm1_time = sample.time;
 120                         }
 121                         if (strcmp(event->comm.comm, comm2) == 0) {
 122                                 CHECK__(perf_evsel__parse_sample(evsel, event,
 123                                                                  &sample));
 124                                 comm2_time = sample.time;
 125                         }
 126 next_event:
 127                         perf_evlist__mmap_consume(evlist, i);
 128                 }
 129         }
 130
 131         if (!comm1_time || !comm2_time)
 132                 goto out_err;
 133
 134         test_time = tsc_to_perf_time(test_tsc, &tc);
 135         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
 136         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
 137
 138         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
 139                  comm1_time, comm1_tsc);
 140         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
 141                  test_time, test_tsc);
 142         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
 143                  comm2_time, comm2_tsc);
 144
 145         if (test_time <= comm1_time ||
 146             test_time >= comm2_time)
 147                 goto out_err;
 148
 149         if (test_tsc <= comm1_tsc ||
 150             test_tsc >= comm2_tsc)
 151                 goto out_err;
 152
 153         err = 0;
 154
 155 out_err:
 156         if (evlist) {
 157                 perf_evlist__disable(evlist);
 158                 perf_evlist__delete(evlist);
 159         }
 160
 161         return err;
 162 }