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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <errno.h>
  3 #include <inttypes.h>
  4 #include <unistd.h>
  5 #include <stdlib.h>
  6 #include <signal.h>
  7 #include <sys/mman.h>
  8 
  9 #include "tests.h"
 10 #include "util/evsel.h"
 11 #include "util/evlist.h"
 12 #include "util/cpumap.h"
 13 #include "util/thread_map.h"
 14 
 15 #define NR_LOOPS  10000000
 16 
 17 /*
 18  * This test will open software clock events (cpu-clock, task-clock)
 19  * then check their frequency -> period conversion has no artifact of
 20  * setting period to 1 forcefully.
 21  */
 22 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
 23 {
 24         int i, err = -1;
 25         volatile int tmp = 0;
 26         u64 total_periods = 0;
 27         int nr_samples = 0;
 28         char sbuf[STRERR_BUFSIZE];
 29         union perf_event *event;
 30         struct perf_evsel *evsel;
 31         struct perf_evlist *evlist;
 32         struct perf_event_attr attr = {
 33                 .type = PERF_TYPE_SOFTWARE,
 34                 .config = clock_id,
 35                 .sample_type = PERF_SAMPLE_PERIOD,
 36                 .exclude_kernel = 1,
 37                 .disabled = 1,
 38                 .freq = 1,
 39         };
 40         struct cpu_map *cpus;
 41         struct thread_map *threads;
 42         struct perf_mmap *md;
 43 
 44         attr.sample_freq = 500;
 45 
 46         evlist = perf_evlist__new();
 47         if (evlist == NULL) {
 48                 pr_debug("perf_evlist__new\n");
 49                 return -1;
 50         }
 51 
 52         evsel = perf_evsel__new(&attr);
 53         if (evsel == NULL) {
 54                 pr_debug("perf_evsel__new\n");
 55                 goto out_delete_evlist;
 56         }
 57         perf_evlist__add(evlist, evsel);
 58 
 59         cpus = cpu_map__dummy_new();
 60         threads = thread_map__new_by_tid(getpid());
 61         if (!cpus || !threads) {
 62                 err = -ENOMEM;
 63                 pr_debug("Not enough memory to create thread/cpu maps\n");
 64                 goto out_free_maps;
 65         }
 66 
 67         perf_evlist__set_maps(evlist, cpus, threads);
 68 
 69         cpus    = NULL;
 70         threads = NULL;
 71 
 72         if (perf_evlist__open(evlist)) {
 73                 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
 74 
 75                 err = -errno;
 76                 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
 77                          str_error_r(errno, sbuf, sizeof(sbuf)),
 78                          knob, (u64)attr.sample_freq);
 79                 goto out_delete_evlist;
 80         }
 81 
 82         err = perf_evlist__mmap(evlist, 128);
 83         if (err < 0) {
 84                 pr_debug("failed to mmap event: %d (%s)\n", errno,
 85                          str_error_r(errno, sbuf, sizeof(sbuf)));
 86                 goto out_delete_evlist;
 87         }
 88 
 89         perf_evlist__enable(evlist);
 90 
 91         /* collect samples */
 92         for (i = 0; i < NR_LOOPS; i++)
 93                 tmp++;
 94 
 95         perf_evlist__disable(evlist);
 96 
 97         md = &evlist->mmap[0];
 98         if (perf_mmap__read_init(md) < 0)
 99                 goto out_init;
100 
101         while ((event = perf_mmap__read_event(md)) != NULL) {
102                 struct perf_sample sample;
103 
104                 if (event->header.type != PERF_RECORD_SAMPLE)
105                         goto next_event;
106 
107                 err = perf_evlist__parse_sample(evlist, event, &sample);
108                 if (err < 0) {
109                         pr_debug("Error during parse sample\n");
110                         goto out_delete_evlist;
111                 }
112 
113                 total_periods += sample.period;
114                 nr_samples++;
115 next_event:
116                 perf_mmap__consume(md);
117         }
118         perf_mmap__read_done(md);
119 
120 out_init:
121         if ((u64) nr_samples == total_periods) {
122                 pr_debug("All (%d) samples have period value of 1!\n",
123                          nr_samples);
124                 err = -1;
125         }
126 
127 out_free_maps:
128         cpu_map__put(cpus);
129         thread_map__put(threads);
130 out_delete_evlist:
131         perf_evlist__delete(evlist);
132         return err;
133 }
134 
135 int test__sw_clock_freq(struct test *test __maybe_unused, int subtest __maybe_unused)
136 {
137         int ret;
138 
139         ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
140         if (!ret)
141                 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
142 
143         return ret;
144 }
145 

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