tools/perf/arch/x86/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/tests.h"
  13
  14 #include "arch-tests.h"
  15
  16 #define CHECK__(x) {                            \
  17         while ((x) < 0) {                       \
  18                 pr_debug(#x " failed!\n");      \
  19                 goto out_err;                   \
  20         }                                       \
  21 }
  22
  23 #define CHECK_NOT_NULL__(x) {                   \
  24         while ((x) == NULL) {                   \
  25                 pr_debug(#x " failed!\n");      \
  26                 goto out_err;                   \
  27         }                                       \
  28 }
  29
  30 /**
  31  * test__perf_time_to_tsc - test converting perf time to TSC.
  32  *
  33  * This function implements a test that checks that the conversion of perf time
  34  * to and from TSC is consistent with the order of events.  If the test passes
  35  * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
  36  * supported then then the test passes but " (not supported)" is printed.
  37  */
  38 int test__perf_time_to_tsc(void)
  39 {
  40         struct record_opts opts = {
  41                 .mmap_pages          = UINT_MAX,
  42                 .user_freq           = UINT_MAX,
  43                 .user_interval       = ULLONG_MAX,
  44                 .freq                = 4000,
  45                 .target              = {
  46                         .uses_mmap   = true,
  47                 },
  48                 .sample_time         = true,
  49         };
  50         struct thread_map *threads = NULL;
  51         struct cpu_map *cpus = NULL;
  52         struct perf_evlist *evlist = NULL;
  53         struct perf_evsel *evsel = NULL;
  54         int err = -1, ret, i;
  55         const char *comm1, *comm2;
  56         struct perf_tsc_conversion tc;
  57         struct perf_event_mmap_page *pc;
  58         union perf_event *event;
  59         u64 test_tsc, comm1_tsc, comm2_tsc;
  60         u64 test_time, comm1_time = 0, comm2_time = 0;
  61
  62         threads = thread_map__new(-1, getpid(), UINT_MAX);
  63         CHECK_NOT_NULL__(threads);
  64
  65         cpus = cpu_map__new(NULL);
  66         CHECK_NOT_NULL__(cpus);
  67
  68         evlist = perf_evlist__new();
  69         CHECK_NOT_NULL__(evlist);
  70
  71         perf_evlist__set_maps(evlist, cpus, threads);
  72
  73         CHECK__(parse_events(evlist, "cycles:u", NULL));
  74
  75         perf_evlist__config(evlist, &opts);
  76
  77         evsel = perf_evlist__first(evlist);
  78
  79         evsel->attr.comm = 1;
  80         evsel->attr.disabled = 1;
  81         evsel->attr.enable_on_exec = 0;
  82
  83         CHECK__(perf_evlist__open(evlist));
  84
  85         CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
  86
  87         pc = evlist->mmap[0].base;
  88         ret = perf_read_tsc_conversion(pc, &tc);
  89         if (ret) {
  90                 if (ret == -EOPNOTSUPP) {
  91                         fprintf(stderr, " (not supported)");
  92                         return 0;
  93                 }
  94                 goto out_err;
  95         }
  96
  97         perf_evlist__enable(evlist);
  98
  99         comm1 = "Test COMM 1";
 100         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
 101
 102         test_tsc = rdtsc();
 103
 104         comm2 = "Test COMM 2";
 105         CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
 106
 107         perf_evlist__disable(evlist);
 108
 109         for (i = 0; i < evlist->nr_mmaps; i++) {
 110                 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 111                         struct perf_sample sample;
 112
 113                         if (event->header.type != PERF_RECORD_COMM ||
 114                             (pid_t)event->comm.pid != getpid() ||
 115                             (pid_t)event->comm.tid != getpid())
 116                                 goto next_event;
 117
 118                         if (strcmp(event->comm.comm, comm1) == 0) {
 119                                 CHECK__(perf_evsel__parse_sample(evsel, event,
 120                                                                  &sample));
 121                                 comm1_time = sample.time;
 122                         }
 123                         if (strcmp(event->comm.comm, comm2) == 0) {
 124                                 CHECK__(perf_evsel__parse_sample(evsel, event,
 125                                                                  &sample));
 126                                 comm2_time = sample.time;
 127                         }
 128 next_event:
 129                         perf_evlist__mmap_consume(evlist, i);
 130                 }
 131         }
 132
 133         if (!comm1_time || !comm2_time)
 134                 goto out_err;
 135
 136         test_time = tsc_to_perf_time(test_tsc, &tc);
 137         comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
 138         comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
 139
 140         pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
 141                  comm1_time, comm1_tsc);
 142         pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
 143                  test_time, test_tsc);
 144         pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
 145                  comm2_time, comm2_tsc);
 146
 147         if (test_time <= comm1_time ||
 148             test_time >= comm2_time)
 149                 goto out_err;
 150
 151         if (test_tsc <= comm1_tsc ||
 152             test_tsc >= comm2_tsc)
 153                 goto out_err;
 154
 155         err = 0;
 156
 157 out_err:
 158         if (evlist) {
 159                 perf_evlist__disable(evlist);
 160                 perf_evlist__delete(evlist);
 161         }
 162
 163         return err;
 164 }