kernel/tools/perf/tests/hists_link.c

   1 #include "perf.h"
   2 #include "tests.h"
   3 #include "debug.h"
   4 #include "symbol.h"
   5 #include "sort.h"
   6 #include "evsel.h"
   7 #include "evlist.h"
   8 #include "machine.h"
   9 #include "thread.h"
  10 #include "parse-events.h"
  11 #include "hists_common.h"
  12
  13 struct sample {
  14         u32 pid;
  15         u64 ip;
  16         struct thread *thread;
  17         struct map *map;
  18         struct symbol *sym;
  19 };
  20
  21 /* For the numbers, see hists_common.c */
  22 static struct sample fake_common_samples[] = {
  23         /* perf [kernel] schedule() */
  24         { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_KERNEL_SCHEDULE, },
  25         /* perf [perf]   main() */
  26         { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_PERF_MAIN, },
  27         /* perf [perf]   cmd_record() */
  28         { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_PERF_CMD_RECORD, },
  29         /* bash [bash]   xmalloc() */
  30         { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_BASH_XMALLOC, },
  31         /* bash [libc]   malloc() */
  32         { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_LIBC_MALLOC, },
  33 };
  34
  35 static struct sample fake_samples[][5] = {
  36         {
  37                 /* perf [perf]   run_command() */
  38                 { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_PERF_RUN_COMMAND, },
  39                 /* perf [libc]   malloc() */
  40                 { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_LIBC_MALLOC, },
  41                 /* perf [kernel] page_fault() */
  42                 { .pid = FAKE_PID_PERF1, .ip = FAKE_IP_KERNEL_PAGE_FAULT, },
  43                 /* perf [kernel] sys_perf_event_open() */
  44                 { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_KERNEL_SYS_PERF_EVENT_OPEN, },
  45                 /* bash [libc]   free() */
  46                 { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_LIBC_FREE, },
  47         },
  48         {
  49                 /* perf [libc]   free() */
  50                 { .pid = FAKE_PID_PERF2, .ip = FAKE_IP_LIBC_FREE, },
  51                 /* bash [libc]   malloc() */
  52                 { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_LIBC_MALLOC, }, /* will be merged */
  53                 /* bash [bash]   xfee() */
  54                 { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_BASH_XFREE, },
  55                 /* bash [libc]   realloc() */
  56                 { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_LIBC_REALLOC, },
  57                 /* bash [kernel] page_fault() */
  58                 { .pid = FAKE_PID_BASH,  .ip = FAKE_IP_KERNEL_PAGE_FAULT, },
  59         },
  60 };
  61
  62 static int add_hist_entries(struct perf_evlist *evlist, struct machine *machine)
  63 {
  64         struct perf_evsel *evsel;
  65         struct addr_location al;
  66         struct hist_entry *he;
  67         struct perf_sample sample = { .period = 1, };
  68         size_t i = 0, k;
  69
  70         /*
  71          * each evsel will have 10 samples - 5 common and 5 distinct.
  72          * However the second evsel also has a collapsed entry for
  73          * "bash [libc] malloc" so total 9 entries will be in the tree.
  74          */
  75         evlist__for_each(evlist, evsel) {
  76                 struct hists *hists = evsel__hists(evsel);
  77
  78                 for (k = 0; k < ARRAY_SIZE(fake_common_samples); k++) {
  79                         const union perf_event event = {
  80                                 .header = {
  81                                         .misc = PERF_RECORD_MISC_USER,
  82                                 },
  83                         };
  84
  85                         sample.pid = fake_common_samples[k].pid;
  86                         sample.tid = fake_common_samples[k].pid;
  87                         sample.ip = fake_common_samples[k].ip;
  88                         if (perf_event__preprocess_sample(&event, machine, &al,
  89                                                           &sample) < 0)
  90                                 goto out;
  91
  92                         he = __hists__add_entry(hists, &al, NULL,
  93                                                 NULL, NULL, 1, 1, 0, true);
  94                         if (he == NULL)
  95                                 goto out;
  96
  97                         fake_common_samples[k].thread = al.thread;
  98                         fake_common_samples[k].map = al.map;
  99                         fake_common_samples[k].sym = al.sym;
 100                 }
 101
 102                 for (k = 0; k < ARRAY_SIZE(fake_samples[i]); k++) {
 103                         const union perf_event event = {
 104                                 .header = {
 105                                         .misc = PERF_RECORD_MISC_USER,
 106                                 },
 107                         };
 108
 109                         sample.pid = fake_samples[i][k].pid;
 110                         sample.tid = fake_samples[i][k].pid;
 111                         sample.ip = fake_samples[i][k].ip;
 112                         if (perf_event__preprocess_sample(&event, machine, &al,
 113                                                           &sample) < 0)
 114                                 goto out;
 115
 116                         he = __hists__add_entry(hists, &al, NULL,
 117                                                 NULL, NULL, 1, 1, 0, true);
 118                         if (he == NULL)
 119                                 goto out;
 120
 121                         fake_samples[i][k].thread = al.thread;
 122                         fake_samples[i][k].map = al.map;
 123                         fake_samples[i][k].sym = al.sym;
 124                 }
 125                 i++;
 126         }
 127
 128         return 0;
 129
 130 out:
 131         pr_debug("Not enough memory for adding a hist entry\n");
 132         return -1;
 133 }
 134
 135 static int find_sample(struct sample *samples, size_t nr_samples,
 136                        struct thread *t, struct map *m, struct symbol *s)
 137 {
 138         while (nr_samples--) {
 139                 if (samples->thread == t && samples->map == m &&
 140                     samples->sym == s)
 141                         return 1;
 142                 samples++;
 143         }
 144         return 0;
 145 }
 146
 147 static int __validate_match(struct hists *hists)
 148 {
 149         size_t count = 0;
 150         struct rb_root *root;
 151         struct rb_node *node;
 152
 153         /*
 154          * Only entries from fake_common_samples should have a pair.
 155          */
 156         if (sort__need_collapse)
 157                 root = &hists->entries_collapsed;
 158         else
 159                 root = hists->entries_in;
 160
 161         node = rb_first(root);
 162         while (node) {
 163                 struct hist_entry *he;
 164
 165                 he = rb_entry(node, struct hist_entry, rb_node_in);
 166
 167                 if (hist_entry__has_pairs(he)) {
 168                         if (find_sample(fake_common_samples,
 169                                         ARRAY_SIZE(fake_common_samples),
 170                                         he->thread, he->ms.map, he->ms.sym)) {
 171                                 count++;
 172                         } else {
 173                                 pr_debug("Can't find the matched entry\n");
 174                                 return -1;
 175                         }
 176                 }
 177
 178                 node = rb_next(node);
 179         }
 180
 181         if (count != ARRAY_SIZE(fake_common_samples)) {
 182                 pr_debug("Invalid count for matched entries: %zd of %zd\n",
 183                          count, ARRAY_SIZE(fake_common_samples));
 184                 return -1;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int validate_match(struct hists *leader, struct hists *other)
 191 {
 192         return __validate_match(leader) || __validate_match(other);
 193 }
 194
 195 static int __validate_link(struct hists *hists, int idx)
 196 {
 197         size_t count = 0;
 198         size_t count_pair = 0;
 199         size_t count_dummy = 0;
 200         struct rb_root *root;
 201         struct rb_node *node;
 202
 203         /*
 204          * Leader hists (idx = 0) will have dummy entries from other,
 205          * and some entries will have no pair.  However every entry
 206          * in other hists should have (dummy) pair.
 207          */
 208         if (sort__need_collapse)
 209                 root = &hists->entries_collapsed;
 210         else
 211                 root = hists->entries_in;
 212
 213         node = rb_first(root);
 214         while (node) {
 215                 struct hist_entry *he;
 216
 217                 he = rb_entry(node, struct hist_entry, rb_node_in);
 218
 219                 if (hist_entry__has_pairs(he)) {
 220                         if (!find_sample(fake_common_samples,
 221                                          ARRAY_SIZE(fake_common_samples),
 222                                          he->thread, he->ms.map, he->ms.sym) &&
 223                             !find_sample(fake_samples[idx],
 224                                          ARRAY_SIZE(fake_samples[idx]),
 225                                          he->thread, he->ms.map, he->ms.sym)) {
 226                                 count_dummy++;
 227                         }
 228                         count_pair++;
 229                 } else if (idx) {
 230                         pr_debug("A entry from the other hists should have pair\n");
 231                         return -1;
 232                 }
 233
 234                 count++;
 235                 node = rb_next(node);
 236         }
 237
 238         /*
 239          * Note that we have a entry collapsed in the other (idx = 1) hists.
 240          */
 241         if (idx == 0) {
 242                 if (count_dummy != ARRAY_SIZE(fake_samples[1]) - 1) {
 243                         pr_debug("Invalid count of dummy entries: %zd of %zd\n",
 244                                  count_dummy, ARRAY_SIZE(fake_samples[1]) - 1);
 245                         return -1;
 246                 }
 247                 if (count != count_pair + ARRAY_SIZE(fake_samples[0])) {
 248                         pr_debug("Invalid count of total leader entries: %zd of %zd\n",
 249                                  count, count_pair + ARRAY_SIZE(fake_samples[0]));
 250                         return -1;
 251                 }
 252         } else {
 253                 if (count != count_pair) {
 254                         pr_debug("Invalid count of total other entries: %zd of %zd\n",
 255                                  count, count_pair);
 256                         return -1;
 257                 }
 258                 if (count_dummy > 0) {
 259                         pr_debug("Other hists should not have dummy entries: %zd\n",
 260                                  count_dummy);
 261                         return -1;
 262                 }
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int validate_link(struct hists *leader, struct hists *other)
 269 {
 270         return __validate_link(leader, 0) || __validate_link(other, 1);
 271 }
 272
 273 int test__hists_link(void)
 274 {
 275         int err = -1;
 276         struct hists *hists, *first_hists;
 277         struct machines machines;
 278         struct machine *machine = NULL;
 279         struct perf_evsel *evsel, *first;
 280         struct perf_evlist *evlist = perf_evlist__new();
 281
 282         if (evlist == NULL)
 283                 return -ENOMEM;
 284
 285         err = parse_events(evlist, "cpu-clock");
 286         if (err)
 287                 goto out;
 288         err = parse_events(evlist, "task-clock");
 289         if (err)
 290                 goto out;
 291
 292         /* default sort order (comm,dso,sym) will be used */
 293         if (setup_sorting() < 0)
 294                 goto out;
 295
 296         machines__init(&machines);
 297
 298         /* setup threads/dso/map/symbols also */
 299         machine = setup_fake_machine(&machines);
 300         if (!machine)
 301                 goto out;
 302
 303         if (verbose > 1)
 304                 machine__fprintf(machine, stderr);
 305
 306         /* process sample events */
 307         err = add_hist_entries(evlist, machine);
 308         if (err < 0)
 309                 goto out;
 310
 311         evlist__for_each(evlist, evsel) {
 312                 hists = evsel__hists(evsel);
 313                 hists__collapse_resort(hists, NULL);
 314
 315                 if (verbose > 2)
 316                         print_hists_in(hists);
 317         }
 318
 319         first = perf_evlist__first(evlist);
 320         evsel = perf_evlist__last(evlist);
 321
 322         first_hists = evsel__hists(first);
 323         hists = evsel__hists(evsel);
 324
 325         /* match common entries */
 326         hists__match(first_hists, hists);
 327         err = validate_match(first_hists, hists);
 328         if (err)
 329                 goto out;
 330
 331         /* link common and/or dummy entries */
 332         hists__link(first_hists, hists);
 333         err = validate_link(first_hists, hists);
 334         if (err)
 335                 goto out;
 336
 337         err = 0;
 338
 339 out:
 340         /* tear down everything */
 341         perf_evlist__delete(evlist);
 342         reset_output_field();
 343         machines__exit(&machines);
 344
 345         return err;
 346 }