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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 #include <linux/string.h>
  9 
 10 #include "tests.h"
 11 #include "util/debug.h"
 12 #include "util/evsel.h"
 13 #include "util/evlist.h"
 14 #include "util/cpumap.h"
 15 #include "util/mmap.h"
 16 #include "util/thread_map.h"
 17 #include <perf/evlist.h>
 18 #include <perf/mmap.h>
 19 
 20 #define NR_LOOPS  10000000
 21 
 22 /*
 23  * This test will open software clock events (cpu-clock, task-clock)
 24  * then check their frequency -> period conversion has no artifact of
 25  * setting period to 1 forcefully.
 26  */
 27 static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
 28 {
 29         int i, err = -1;
 30         volatile int tmp = 0;
 31         u64 total_periods = 0;
 32         int nr_samples = 0;
 33         char sbuf[STRERR_BUFSIZE];
 34         union perf_event *event;
 35         struct evsel *evsel;
 36         struct evlist *evlist;
 37         struct perf_event_attr attr = {
 38                 .type = PERF_TYPE_SOFTWARE,
 39                 .config = clock_id,
 40                 .sample_type = PERF_SAMPLE_PERIOD,
 41                 .exclude_kernel = 1,
 42                 .disabled = 1,
 43                 .freq = 1,
 44         };
 45         struct perf_cpu_map *cpus = NULL;
 46         struct perf_thread_map *threads = NULL;
 47         struct mmap *md;
 48 
 49         attr.sample_freq = 500;
 50 
 51         evlist = evlist__new();
 52         if (evlist == NULL) {
 53                 pr_debug("evlist__new\n");
 54                 return -1;
 55         }
 56 
 57         evsel = evsel__new(&attr);
 58         if (evsel == NULL) {
 59                 pr_debug("evsel__new\n");
 60                 goto out_delete_evlist;
 61         }
 62         evlist__add(evlist, evsel);
 63 
 64         cpus = perf_cpu_map__dummy_new();
 65         threads = thread_map__new_by_tid(getpid());
 66         if (!cpus || !threads) {
 67                 err = -ENOMEM;
 68                 pr_debug("Not enough memory to create thread/cpu maps\n");
 69                 goto out_delete_evlist;
 70         }
 71 
 72         perf_evlist__set_maps(&evlist->core, cpus, threads);
 73 
 74         if (evlist__open(evlist)) {
 75                 const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
 76 
 77                 err = -errno;
 78                 pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
 79                          str_error_r(errno, sbuf, sizeof(sbuf)),
 80                          knob, (u64)attr.sample_freq);
 81                 goto out_delete_evlist;
 82         }
 83 
 84         err = evlist__mmap(evlist, 128);
 85         if (err < 0) {
 86                 pr_debug("failed to mmap event: %d (%s)\n", errno,
 87                          str_error_r(errno, sbuf, sizeof(sbuf)));
 88                 goto out_delete_evlist;
 89         }
 90 
 91         evlist__enable(evlist);
 92 
 93         /* collect samples */
 94         for (i = 0; i < NR_LOOPS; i++)
 95                 tmp++;
 96 
 97         evlist__disable(evlist);
 98 
 99         md = &evlist->mmap[0];
100         if (perf_mmap__read_init(&md->core) < 0)
101                 goto out_init;
102 
103         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
104                 struct perf_sample sample;
105 
106                 if (event->header.type != PERF_RECORD_SAMPLE)
107                         goto next_event;
108 
109                 err = evlist__parse_sample(evlist, event, &sample);
110                 if (err < 0) {
111                         pr_debug("Error during parse sample\n");
112                         goto out_delete_evlist;
113                 }
114 
115                 total_periods += sample.period;
116                 nr_samples++;
117 next_event:
118                 perf_mmap__consume(&md->core);
119         }
120         perf_mmap__read_done(&md->core);
121 
122 out_init:
123         if ((u64) nr_samples == total_periods) {
124                 pr_debug("All (%d) samples have period value of 1!\n",
125                          nr_samples);
126                 err = -1;
127         }
128 
129 out_delete_evlist:
130         perf_cpu_map__put(cpus);
131         perf_thread_map__put(threads);
132         evlist__delete(evlist);
133         return err;
134 }
135 
136 static int test__sw_clock_freq(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
137 {
138         int ret;
139 
140         ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
141         if (!ret)
142                 ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
143 
144         return ret;
145 }
146 
147 DEFINE_SUITE("Software clock events period values", sw_clock_freq);
148 

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