tools/perf/bench/evlist-open-close.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <inttypes.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <limits.h>
   6 #include "bench.h"
   7 #include "../util/debug.h"
   8 #include "../util/stat.h"
   9 #include "../util/evlist.h"
  10 #include "../util/evsel.h"
  11 #include "../util/strbuf.h"
  12 #include "../util/record.h"
  13 #include "../util/parse-events.h"
  14 #include "internal/threadmap.h"
  15 #include "internal/cpumap.h"
  16 #include <linux/perf_event.h>
  17 #include <linux/kernel.h>
  18 #include <linux/time64.h>
  19 #include <linux/string.h>
  20 #include <subcmd/parse-options.h>
  21
  22 #define MMAP_FLUSH_DEFAULT 1
  23
  24 static int iterations = 100;
  25 static int nr_events = 1;
  26 static const char *event_string = "dummy";
  27
  28 static inline u64 timeval2usec(struct timeval *tv)
  29 {
  30         return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
  31 }
  32
  33 static struct record_opts opts = {
  34         .sample_time         = true,
  35         .mmap_pages          = UINT_MAX,
  36         .user_freq           = UINT_MAX,
  37         .user_interval       = ULLONG_MAX,
  38         .freq                = 4000,
  39         .target              = {
  40                 .uses_mmap   = true,
  41                 .default_per_cpu = true,
  42         },
  43         .mmap_flush          = MMAP_FLUSH_DEFAULT,
  44         .nr_threads_synthesize = 1,
  45         .ctl_fd              = -1,
  46         .ctl_fd_ack          = -1,
  47 };
  48
  49 static const struct option options[] = {
  50         OPT_STRING('e', "event", &event_string, "event", "event selector. use 'perf list' to list available events"),
  51         OPT_INTEGER('n', "nr-events", &nr_events,
  52                      "number of dummy events to create (default 1). If used with -e, it clones those events n times (1 = no change)"),
  53         OPT_INTEGER('i', "iterations", &iterations, "Number of iterations used to compute average (default=100)"),
  54         OPT_BOOLEAN('a', "all-cpus", &opts.target.system_wide, "system-wide collection from all CPUs"),
  55         OPT_STRING('C', "cpu", &opts.target.cpu_list, "cpu", "list of cpus where to open events"),
  56         OPT_STRING('p', "pid", &opts.target.pid, "pid", "record events on existing process id"),
  57         OPT_STRING('t', "tid", &opts.target.tid, "tid", "record events on existing thread id"),
  58         OPT_STRING('u', "uid", &opts.target.uid_str, "user", "user to profile"),
  59         OPT_BOOLEAN(0, "per-thread", &opts.target.per_thread, "use per-thread mmaps"),
  60         OPT_END()
  61 };
  62
  63 static const char *const bench_usage[] = {
  64         "perf bench internals evlist-open-close <options>",
  65         NULL
  66 };
  67
  68 static int evlist__count_evsel_fds(struct evlist *evlist)
  69 {
  70         struct evsel *evsel;
  71         int cnt = 0;
  72
  73         evlist__for_each_entry(evlist, evsel)
  74                 cnt += evsel->core.threads->nr * perf_cpu_map__nr(evsel->core.cpus);
  75
  76         return cnt;
  77 }
  78
  79 static struct evlist *bench__create_evlist(char *evstr)
  80 {
  81         struct parse_events_error err;
  82         struct evlist *evlist = evlist__new();
  83         int ret;
  84
  85         if (!evlist) {
  86                 pr_err("Not enough memory to create evlist\n");
  87                 return NULL;
  88         }
  89
  90         parse_events_error__init(&err);
  91         ret = parse_events(evlist, evstr, &err);
  92         if (ret) {
  93                 parse_events_error__print(&err, evstr);
  94                 parse_events_error__exit(&err);
  95                 pr_err("Run 'perf list' for a list of valid events\n");
  96                 ret = 1;
  97                 goto out_delete_evlist;
  98         }
  99         parse_events_error__exit(&err);
 100         ret = evlist__create_maps(evlist, &opts.target);
 101         if (ret < 0) {
 102                 pr_err("Not enough memory to create thread/cpu maps\n");
 103                 goto out_delete_evlist;
 104         }
 105
 106         evlist__config(evlist, &opts, NULL);
 107
 108         return evlist;
 109
 110 out_delete_evlist:
 111         evlist__delete(evlist);
 112         return NULL;
 113 }
 114
 115 static int bench__do_evlist_open_close(struct evlist *evlist)
 116 {
 117         char sbuf[STRERR_BUFSIZE];
 118         int err = evlist__open(evlist);
 119
 120         if (err < 0) {
 121                 pr_err("evlist__open: %s\n", str_error_r(errno, sbuf, sizeof(sbuf)));
 122                 return err;
 123         }
 124
 125         err = evlist__mmap(evlist, opts.mmap_pages);
 126         if (err < 0) {
 127                 pr_err("evlist__mmap: %s\n", str_error_r(errno, sbuf, sizeof(sbuf)));
 128                 return err;
 129         }
 130
 131         evlist__enable(evlist);
 132         evlist__disable(evlist);
 133         evlist__munmap(evlist);
 134         evlist__close(evlist);
 135
 136         return 0;
 137 }
 138
 139 static int bench_evlist_open_close__run(char *evstr)
 140 {
 141         // used to print statistics only
 142         struct evlist *evlist = bench__create_evlist(evstr);
 143         double time_average, time_stddev;
 144         struct timeval start, end, diff;
 145         struct stats time_stats;
 146         u64 runtime_us;
 147         int i, err;
 148
 149         if (!evlist)
 150                 return -ENOMEM;
 151
 152         init_stats(&time_stats);
 153
 154         printf("  Number of cpus:\t%d\n", perf_cpu_map__nr(evlist->core.cpus));
 155         printf("  Number of threads:\t%d\n", evlist->core.threads->nr);
 156         printf("  Number of events:\t%d (%d fds)\n",
 157                 evlist->core.nr_entries, evlist__count_evsel_fds(evlist));
 158         printf("  Number of iterations:\t%d\n", iterations);
 159
 160         evlist__delete(evlist);
 161
 162         for (i = 0; i < iterations; i++) {
 163                 pr_debug("Started iteration %d\n", i);
 164                 evlist = bench__create_evlist(evstr);
 165                 if (!evlist)
 166                         return -ENOMEM;
 167
 168                 gettimeofday(&start, NULL);
 169                 err = bench__do_evlist_open_close(evlist);
 170                 if (err) {
 171                         evlist__delete(evlist);
 172                         return err;
 173                 }
 174
 175                 gettimeofday(&end, NULL);
 176                 timersub(&end, &start, &diff);
 177                 runtime_us = timeval2usec(&diff);
 178                 update_stats(&time_stats, runtime_us);
 179
 180                 evlist__delete(evlist);
 181                 pr_debug("Iteration %d took:\t%" PRIu64 "us\n", i, runtime_us);
 182         }
 183
 184         time_average = avg_stats(&time_stats);
 185         time_stddev = stddev_stats(&time_stats);
 186         printf("  Average open-close took: %.3f usec (+- %.3f usec)\n", time_average, time_stddev);
 187
 188         return 0;
 189 }
 190
 191 static char *bench__repeat_event_string(const char *evstr, int n)
 192 {
 193         char sbuf[STRERR_BUFSIZE];
 194         struct strbuf buf;
 195         int i, str_size = strlen(evstr),
 196             final_size = str_size * n + n,
 197             err = strbuf_init(&buf, final_size);
 198
 199         if (err) {
 200                 pr_err("strbuf_init: %s\n", str_error_r(err, sbuf, sizeof(sbuf)));
 201                 goto out_error;
 202         }
 203
 204         for (i = 0; i < n; i++) {
 205                 err = strbuf_add(&buf, evstr, str_size);
 206                 if (err) {
 207                         pr_err("strbuf_add: %s\n", str_error_r(err, sbuf, sizeof(sbuf)));
 208                         goto out_error;
 209                 }
 210
 211                 err = strbuf_addch(&buf, i == n-1 ? '\0' : ',');
 212                 if (err) {
 213                         pr_err("strbuf_addch: %s\n", str_error_r(err, sbuf, sizeof(sbuf)));
 214                         goto out_error;
 215                 }
 216         }
 217
 218         return strbuf_detach(&buf, NULL);
 219
 220 out_error:
 221         strbuf_release(&buf);
 222         return NULL;
 223 }
 224
 225
 226 int bench_evlist_open_close(int argc, const char **argv)
 227 {
 228         char *evstr, errbuf[BUFSIZ];
 229         int err;
 230
 231         argc = parse_options(argc, argv, options, bench_usage, 0);
 232         if (argc) {
 233                 usage_with_options(bench_usage, options);
 234                 exit(EXIT_FAILURE);
 235         }
 236
 237         err = target__validate(&opts.target);
 238         if (err) {
 239                 target__strerror(&opts.target, err, errbuf, sizeof(errbuf));
 240                 pr_err("%s\n", errbuf);
 241                 goto out;
 242         }
 243
 244         err = target__parse_uid(&opts.target);
 245         if (err) {
 246                 target__strerror(&opts.target, err, errbuf, sizeof(errbuf));
 247                 pr_err("%s", errbuf);
 248                 goto out;
 249         }
 250
 251         /* Enable ignoring missing threads when -u/-p option is defined. */
 252         opts.ignore_missing_thread = opts.target.uid != UINT_MAX || opts.target.pid;
 253
 254         evstr = bench__repeat_event_string(event_string, nr_events);
 255         if (!evstr) {
 256                 err = -ENOMEM;
 257                 goto out;
 258         }
 259
 260         err = bench_evlist_open_close__run(evstr);
 261
 262         free(evstr);
 263 out:
 264         return err;
 265 }