qemu/tests/test-throttle.c

   1 /*
   2  * Throttle infrastructure tests
   3  *
   4  * Copyright Nodalink, EURL. 2013-2014
   5  * Copyright Igalia, S.L. 2015
   6  *
   7  * Authors:
   8  *  Benoît Canet     <benoit.canet@nodalink.com>
   9  *  Alberto Garcia   <berto@igalia.com>
  10  *
  11  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  12  * See the COPYING.LIB file in the top-level directory.
  13  */
  14
  15 #include <glib.h>
  16 #include <math.h>
  17 #include "block/aio.h"
  18 #include "qemu/throttle.h"
  19 #include "qemu/error-report.h"
  20 #include "block/throttle-groups.h"
  21
  22 static AioContext     *ctx;
  23 static LeakyBucket    bkt;
  24 static ThrottleConfig cfg;
  25 static ThrottleState  ts;
  26 static ThrottleTimers tt;
  27
  28 /* useful function */
  29 static bool double_cmp(double x, double y)
  30 {
  31     return fabsl(x - y) < 1e-6;
  32 }
  33
  34 /* tests for single bucket operations */
  35 static void test_leak_bucket(void)
  36 {
  37     /* set initial value */
  38     bkt.avg = 150;
  39     bkt.max = 15;
  40     bkt.level = 1.5;
  41
  42     /* leak an op work of time */
  43     throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
  44     g_assert(bkt.avg == 150);
  45     g_assert(bkt.max == 15);
  46     g_assert(double_cmp(bkt.level, 0.5));
  47
  48     /* leak again emptying the bucket */
  49     throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
  50     g_assert(bkt.avg == 150);
  51     g_assert(bkt.max == 15);
  52     g_assert(double_cmp(bkt.level, 0));
  53
  54     /* check that the bucket level won't go lower */
  55     throttle_leak_bucket(&bkt, NANOSECONDS_PER_SECOND / 150);
  56     g_assert(bkt.avg == 150);
  57     g_assert(bkt.max == 15);
  58     g_assert(double_cmp(bkt.level, 0));
  59 }
  60
  61 static void test_compute_wait(void)
  62 {
  63     int64_t wait;
  64     int64_t result;
  65
  66     /* no operation limit set */
  67     bkt.avg = 0;
  68     bkt.max = 15;
  69     bkt.level = 1.5;
  70     wait = throttle_compute_wait(&bkt);
  71     g_assert(!wait);
  72
  73     /* zero delta */
  74     bkt.avg = 150;
  75     bkt.max = 15;
  76     bkt.level = 15;
  77     wait = throttle_compute_wait(&bkt);
  78     g_assert(!wait);
  79
  80     /* below zero delta */
  81     bkt.avg = 150;
  82     bkt.max = 15;
  83     bkt.level = 9;
  84     wait = throttle_compute_wait(&bkt);
  85     g_assert(!wait);
  86
  87     /* half an operation above max */
  88     bkt.avg = 150;
  89     bkt.max = 15;
  90     bkt.level = 15.5;
  91     wait = throttle_compute_wait(&bkt);
  92     /* time required to do half an operation */
  93     result = (int64_t)  NANOSECONDS_PER_SECOND / 150 / 2;
  94     g_assert(wait == result);
  95 }
  96
  97 /* functions to test ThrottleState initialization/destroy methods */
  98 static void read_timer_cb(void *opaque)
  99 {
 100 }
 101
 102 static void write_timer_cb(void *opaque)
 103 {
 104 }
 105
 106 static void test_init(void)
 107 {
 108     int i;
 109
 110     /* fill the structures with crap */
 111     memset(&ts, 1, sizeof(ts));
 112     memset(&tt, 1, sizeof(tt));
 113
 114     /* init structures */
 115     throttle_init(&ts);
 116     throttle_timers_init(&tt, ctx, QEMU_CLOCK_VIRTUAL,
 117                          read_timer_cb, write_timer_cb, &ts);
 118
 119     /* check initialized fields */
 120     g_assert(tt.clock_type == QEMU_CLOCK_VIRTUAL);
 121     g_assert(tt.timers[0]);
 122     g_assert(tt.timers[1]);
 123
 124     /* check other fields where cleared */
 125     g_assert(!ts.previous_leak);
 126     g_assert(!ts.cfg.op_size);
 127     for (i = 0; i < BUCKETS_COUNT; i++) {
 128         g_assert(!ts.cfg.buckets[i].avg);
 129         g_assert(!ts.cfg.buckets[i].max);
 130         g_assert(!ts.cfg.buckets[i].level);
 131     }
 132
 133     throttle_timers_destroy(&tt);
 134 }
 135
 136 static void test_destroy(void)
 137 {
 138     int i;
 139     throttle_init(&ts);
 140     throttle_timers_init(&tt, ctx, QEMU_CLOCK_VIRTUAL,
 141                          read_timer_cb, write_timer_cb, &ts);
 142     throttle_timers_destroy(&tt);
 143     for (i = 0; i < 2; i++) {
 144         g_assert(!tt.timers[i]);
 145     }
 146 }
 147
 148 /* function to test throttle_config and throttle_get_config */
 149 static void test_config_functions(void)
 150 {
 151     int i;
 152     ThrottleConfig orig_cfg, final_cfg;
 153
 154     orig_cfg.buckets[THROTTLE_BPS_TOTAL].avg = 153;
 155     orig_cfg.buckets[THROTTLE_BPS_READ].avg  = 56;
 156     orig_cfg.buckets[THROTTLE_BPS_WRITE].avg = 1;
 157
 158     orig_cfg.buckets[THROTTLE_OPS_TOTAL].avg = 150;
 159     orig_cfg.buckets[THROTTLE_OPS_READ].avg  = 69;
 160     orig_cfg.buckets[THROTTLE_OPS_WRITE].avg = 23;
 161
 162     orig_cfg.buckets[THROTTLE_BPS_TOTAL].max = 0; /* should be corrected */
 163     orig_cfg.buckets[THROTTLE_BPS_READ].max  = 1; /* should not be corrected */
 164     orig_cfg.buckets[THROTTLE_BPS_WRITE].max = 120;
 165
 166     orig_cfg.buckets[THROTTLE_OPS_TOTAL].max = 150;
 167     orig_cfg.buckets[THROTTLE_OPS_READ].max  = 400;
 168     orig_cfg.buckets[THROTTLE_OPS_WRITE].max = 500;
 169
 170     orig_cfg.buckets[THROTTLE_BPS_TOTAL].level = 45;
 171     orig_cfg.buckets[THROTTLE_BPS_READ].level  = 65;
 172     orig_cfg.buckets[THROTTLE_BPS_WRITE].level = 23;
 173
 174     orig_cfg.buckets[THROTTLE_OPS_TOTAL].level = 1;
 175     orig_cfg.buckets[THROTTLE_OPS_READ].level  = 90;
 176     orig_cfg.buckets[THROTTLE_OPS_WRITE].level = 75;
 177
 178     orig_cfg.op_size = 1;
 179
 180     throttle_init(&ts);
 181     throttle_timers_init(&tt, ctx, QEMU_CLOCK_VIRTUAL,
 182                          read_timer_cb, write_timer_cb, &ts);
 183     /* structure reset by throttle_init previous_leak should be null */
 184     g_assert(!ts.previous_leak);
 185     throttle_config(&ts, &tt, &orig_cfg);
 186
 187     /* has previous leak been initialized by throttle_config ? */
 188     g_assert(ts.previous_leak);
 189
 190     /* get back the fixed configuration */
 191     throttle_get_config(&ts, &final_cfg);
 192
 193     throttle_timers_destroy(&tt);
 194
 195     g_assert(final_cfg.buckets[THROTTLE_BPS_TOTAL].avg == 153);
 196     g_assert(final_cfg.buckets[THROTTLE_BPS_READ].avg  == 56);
 197     g_assert(final_cfg.buckets[THROTTLE_BPS_WRITE].avg == 1);
 198
 199     g_assert(final_cfg.buckets[THROTTLE_OPS_TOTAL].avg == 150);
 200     g_assert(final_cfg.buckets[THROTTLE_OPS_READ].avg  == 69);
 201     g_assert(final_cfg.buckets[THROTTLE_OPS_WRITE].avg == 23);
 202
 203     g_assert(final_cfg.buckets[THROTTLE_BPS_TOTAL].max == 15.3);/* fixed */
 204     g_assert(final_cfg.buckets[THROTTLE_BPS_READ].max  == 1);   /* not fixed */
 205     g_assert(final_cfg.buckets[THROTTLE_BPS_WRITE].max == 120);
 206
 207     g_assert(final_cfg.buckets[THROTTLE_OPS_TOTAL].max == 150);
 208     g_assert(final_cfg.buckets[THROTTLE_OPS_READ].max  == 400);
 209     g_assert(final_cfg.buckets[THROTTLE_OPS_WRITE].max == 500);
 210
 211     g_assert(final_cfg.op_size == 1);
 212
 213     /* check bucket have been cleared */
 214     for (i = 0; i < BUCKETS_COUNT; i++) {
 215         g_assert(!final_cfg.buckets[i].level);
 216     }
 217 }
 218
 219 /* functions to test is throttle is enabled by a config */
 220 static void set_cfg_value(bool is_max, int index, int value)
 221 {
 222     if (is_max) {
 223         cfg.buckets[index].max = value;
 224     } else {
 225         cfg.buckets[index].avg = value;
 226     }
 227 }
 228
 229 static void test_enabled(void)
 230 {
 231     int i;
 232
 233     memset(&cfg, 0, sizeof(cfg));
 234     g_assert(!throttle_enabled(&cfg));
 235
 236     for (i = 0; i < BUCKETS_COUNT; i++) {
 237         memset(&cfg, 0, sizeof(cfg));
 238         set_cfg_value(false, i, 150);
 239         g_assert(throttle_enabled(&cfg));
 240     }
 241
 242     for (i = 0; i < BUCKETS_COUNT; i++) {
 243         memset(&cfg, 0, sizeof(cfg));
 244         set_cfg_value(false, i, -150);
 245         g_assert(!throttle_enabled(&cfg));
 246     }
 247 }
 248
 249 /* tests functions for throttle_conflicting */
 250
 251 static void test_conflicts_for_one_set(bool is_max,
 252                                        int total,
 253                                        int read,
 254                                        int write)
 255 {
 256     memset(&cfg, 0, sizeof(cfg));
 257     g_assert(!throttle_conflicting(&cfg));
 258
 259     set_cfg_value(is_max, total, 1);
 260     set_cfg_value(is_max, read,  1);
 261     g_assert(throttle_conflicting(&cfg));
 262
 263     memset(&cfg, 0, sizeof(cfg));
 264     set_cfg_value(is_max, total, 1);
 265     set_cfg_value(is_max, write, 1);
 266     g_assert(throttle_conflicting(&cfg));
 267
 268     memset(&cfg, 0, sizeof(cfg));
 269     set_cfg_value(is_max, total, 1);
 270     set_cfg_value(is_max, read,  1);
 271     set_cfg_value(is_max, write, 1);
 272     g_assert(throttle_conflicting(&cfg));
 273
 274     memset(&cfg, 0, sizeof(cfg));
 275     set_cfg_value(is_max, total, 1);
 276     g_assert(!throttle_conflicting(&cfg));
 277
 278     memset(&cfg, 0, sizeof(cfg));
 279     set_cfg_value(is_max, read,  1);
 280     set_cfg_value(is_max, write, 1);
 281     g_assert(!throttle_conflicting(&cfg));
 282 }
 283
 284 static void test_conflicting_config(void)
 285 {
 286     /* bps average conflicts */
 287     test_conflicts_for_one_set(false,
 288                                THROTTLE_BPS_TOTAL,
 289                                THROTTLE_BPS_READ,
 290                                THROTTLE_BPS_WRITE);
 291
 292     /* ops average conflicts */
 293     test_conflicts_for_one_set(false,
 294                                THROTTLE_OPS_TOTAL,
 295                                THROTTLE_OPS_READ,
 296                                THROTTLE_OPS_WRITE);
 297
 298     /* bps average conflicts */
 299     test_conflicts_for_one_set(true,
 300                                THROTTLE_BPS_TOTAL,
 301                                THROTTLE_BPS_READ,
 302                                THROTTLE_BPS_WRITE);
 303     /* ops average conflicts */
 304     test_conflicts_for_one_set(true,
 305                                THROTTLE_OPS_TOTAL,
 306                                THROTTLE_OPS_READ,
 307                                THROTTLE_OPS_WRITE);
 308 }
 309 /* functions to test the throttle_is_valid function */
 310 static void test_is_valid_for_value(int value, bool should_be_valid)
 311 {
 312     int is_max, index;
 313     for (is_max = 0; is_max < 2; is_max++) {
 314         for (index = 0; index < BUCKETS_COUNT; index++) {
 315             memset(&cfg, 0, sizeof(cfg));
 316             set_cfg_value(is_max, index, value);
 317             g_assert(throttle_is_valid(&cfg) == should_be_valid);
 318         }
 319     }
 320 }
 321
 322 static void test_is_valid(void)
 323 {
 324     /* negative number are invalid */
 325     test_is_valid_for_value(-1, false);
 326     /* zero are valids */
 327     test_is_valid_for_value(0, true);
 328     /* positives numers are valids */
 329     test_is_valid_for_value(1, true);
 330 }
 331
 332 static void test_have_timer(void)
 333 {
 334     /* zero structures */
 335     memset(&ts, 0, sizeof(ts));
 336     memset(&tt, 0, sizeof(tt));
 337
 338     /* no timer set should return false */
 339     g_assert(!throttle_timers_are_initialized(&tt));
 340
 341     /* init structures */
 342     throttle_init(&ts);
 343     throttle_timers_init(&tt, ctx, QEMU_CLOCK_VIRTUAL,
 344                          read_timer_cb, write_timer_cb, &ts);
 345
 346     /* timer set by init should return true */
 347     g_assert(throttle_timers_are_initialized(&tt));
 348
 349     throttle_timers_destroy(&tt);
 350 }
 351
 352 static void test_detach_attach(void)
 353 {
 354     /* zero structures */
 355     memset(&ts, 0, sizeof(ts));
 356     memset(&tt, 0, sizeof(tt));
 357
 358     /* init the structure */
 359     throttle_init(&ts);
 360     throttle_timers_init(&tt, ctx, QEMU_CLOCK_VIRTUAL,
 361                          read_timer_cb, write_timer_cb, &ts);
 362
 363     /* timer set by init should return true */
 364     g_assert(throttle_timers_are_initialized(&tt));
 365
 366     /* timer should no longer exist after detaching */
 367     throttle_timers_detach_aio_context(&tt);
 368     g_assert(!throttle_timers_are_initialized(&tt));
 369
 370     /* timer should exist again after attaching */
 371     throttle_timers_attach_aio_context(&tt, ctx);
 372     g_assert(throttle_timers_are_initialized(&tt));
 373
 374     throttle_timers_destroy(&tt);
 375 }
 376
 377 static bool do_test_accounting(bool is_ops, /* are we testing bps or ops */
 378                 int size,                   /* size of the operation to do */
 379                 double avg,                 /* io limit */
 380                 uint64_t op_size,           /* ideal size of an io */
 381                 double total_result,
 382                 double read_result,
 383                 double write_result)
 384 {
 385     BucketType to_test[2][3] = { { THROTTLE_BPS_TOTAL,
 386                                    THROTTLE_BPS_READ,
 387                                    THROTTLE_BPS_WRITE, },
 388                                  { THROTTLE_OPS_TOTAL,
 389                                    THROTTLE_OPS_READ,
 390                                    THROTTLE_OPS_WRITE, } };
 391     ThrottleConfig cfg;
 392     BucketType index;
 393     int i;
 394
 395     for (i = 0; i < 3; i++) {
 396         BucketType index = to_test[is_ops][i];
 397         cfg.buckets[index].avg = avg;
 398     }
 399
 400     cfg.op_size = op_size;
 401
 402     throttle_init(&ts);
 403     throttle_timers_init(&tt, ctx, QEMU_CLOCK_VIRTUAL,
 404                          read_timer_cb, write_timer_cb, &ts);
 405     throttle_config(&ts, &tt, &cfg);
 406
 407     /* account a read */
 408     throttle_account(&ts, false, size);
 409     /* account a write */
 410     throttle_account(&ts, true, size);
 411
 412     /* check total result */
 413     index = to_test[is_ops][0];
 414     if (!double_cmp(ts.cfg.buckets[index].level, total_result)) {
 415         return false;
 416     }
 417
 418     /* check read result */
 419     index = to_test[is_ops][1];
 420     if (!double_cmp(ts.cfg.buckets[index].level, read_result)) {
 421         return false;
 422     }
 423
 424     /* check write result */
 425     index = to_test[is_ops][2];
 426     if (!double_cmp(ts.cfg.buckets[index].level, write_result)) {
 427         return false;
 428     }
 429
 430     throttle_timers_destroy(&tt);
 431
 432     return true;
 433 }
 434
 435 static void test_accounting(void)
 436 {
 437     /* tests for bps */
 438
 439     /* op of size 1 */
 440     g_assert(do_test_accounting(false,
 441                                 1 * 512,
 442                                 150,
 443                                 0,
 444                                 1024,
 445                                 512,
 446                                 512));
 447
 448     /* op of size 2 */
 449     g_assert(do_test_accounting(false,
 450                                 2 * 512,
 451                                 150,
 452                                 0,
 453                                 2048,
 454                                 1024,
 455                                 1024));
 456
 457     /* op of size 2 and orthogonal parameter change */
 458     g_assert(do_test_accounting(false,
 459                                 2 * 512,
 460                                 150,
 461                                 17,
 462                                 2048,
 463                                 1024,
 464                                 1024));
 465
 466
 467     /* tests for ops */
 468
 469     /* op of size 1 */
 470     g_assert(do_test_accounting(true,
 471                                 1 * 512,
 472                                 150,
 473                                 0,
 474                                 2,
 475                                 1,
 476                                 1));
 477
 478     /* op of size 2 */
 479     g_assert(do_test_accounting(true,
 480                                 2 *  512,
 481                                 150,
 482                                 0,
 483                                 2,
 484                                 1,
 485                                 1));
 486
 487     /* jumbo op accounting fragmentation : size 64 with op size of 13 units */
 488     g_assert(do_test_accounting(true,
 489                                 64 * 512,
 490                                 150,
 491                                 13 * 512,
 492                                 (64.0 * 2) / 13,
 493                                 (64.0 / 13),
 494                                 (64.0 / 13)));
 495
 496     /* same with orthogonal parameters changes */
 497     g_assert(do_test_accounting(true,
 498                                 64 * 512,
 499                                 300,
 500                                 13 * 512,
 501                                 (64.0 * 2) / 13,
 502                                 (64.0 / 13),
 503                                 (64.0 / 13)));
 504 }
 505
 506 static void test_groups(void)
 507 {
 508     ThrottleConfig cfg1, cfg2;
 509     BlockDriverState *bdrv1, *bdrv2, *bdrv3;
 510
 511     bdrv1 = bdrv_new();
 512     bdrv2 = bdrv_new();
 513     bdrv3 = bdrv_new();
 514
 515     g_assert(bdrv1->throttle_state == NULL);
 516     g_assert(bdrv2->throttle_state == NULL);
 517     g_assert(bdrv3->throttle_state == NULL);
 518
 519     throttle_group_register_bs(bdrv1, "bar");
 520     throttle_group_register_bs(bdrv2, "foo");
 521     throttle_group_register_bs(bdrv3, "bar");
 522
 523     g_assert(bdrv1->throttle_state != NULL);
 524     g_assert(bdrv2->throttle_state != NULL);
 525     g_assert(bdrv3->throttle_state != NULL);
 526
 527     g_assert(!strcmp(throttle_group_get_name(bdrv1), "bar"));
 528     g_assert(!strcmp(throttle_group_get_name(bdrv2), "foo"));
 529     g_assert(bdrv1->throttle_state == bdrv3->throttle_state);
 530
 531     /* Setting the config of a group member affects the whole group */
 532     memset(&cfg1, 0, sizeof(cfg1));
 533     cfg1.buckets[THROTTLE_BPS_READ].avg  = 500000;
 534     cfg1.buckets[THROTTLE_BPS_WRITE].avg = 285000;
 535     cfg1.buckets[THROTTLE_OPS_READ].avg  = 20000;
 536     cfg1.buckets[THROTTLE_OPS_WRITE].avg = 12000;
 537     throttle_group_config(bdrv1, &cfg1);
 538
 539     throttle_group_get_config(bdrv1, &cfg1);
 540     throttle_group_get_config(bdrv3, &cfg2);
 541     g_assert(!memcmp(&cfg1, &cfg2, sizeof(cfg1)));
 542
 543     cfg2.buckets[THROTTLE_BPS_READ].avg  = 4547;
 544     cfg2.buckets[THROTTLE_BPS_WRITE].avg = 1349;
 545     cfg2.buckets[THROTTLE_OPS_READ].avg  = 123;
 546     cfg2.buckets[THROTTLE_OPS_WRITE].avg = 86;
 547     throttle_group_config(bdrv3, &cfg1);
 548
 549     throttle_group_get_config(bdrv1, &cfg1);
 550     throttle_group_get_config(bdrv3, &cfg2);
 551     g_assert(!memcmp(&cfg1, &cfg2, sizeof(cfg1)));
 552
 553     throttle_group_unregister_bs(bdrv1);
 554     throttle_group_unregister_bs(bdrv2);
 555     throttle_group_unregister_bs(bdrv3);
 556
 557     g_assert(bdrv1->throttle_state == NULL);
 558     g_assert(bdrv2->throttle_state == NULL);
 559     g_assert(bdrv3->throttle_state == NULL);
 560 }
 561
 562 int main(int argc, char **argv)
 563 {
 564     Error *local_error = NULL;
 565
 566     qemu_init_main_loop(&local_error);
 567     ctx = qemu_get_aio_context();
 568
 569     if (!ctx) {
 570         error_report("Failed to create AIO Context: '%s'",
 571                      local_error ? error_get_pretty(local_error) :
 572                      "Failed to initialize the QEMU main loop");
 573         if (local_error) {
 574             error_free(local_error);
 575         }
 576         exit(1);
 577     }
 578
 579     bdrv_init();
 580
 581     do {} while (g_main_context_iteration(NULL, false));
 582
 583     /* tests in the same order as the header function declarations */
 584     g_test_init(&argc, &argv, NULL);
 585     g_test_add_func("/throttle/leak_bucket",        test_leak_bucket);
 586     g_test_add_func("/throttle/compute_wait",       test_compute_wait);
 587     g_test_add_func("/throttle/init",               test_init);
 588     g_test_add_func("/throttle/destroy",            test_destroy);
 589     g_test_add_func("/throttle/have_timer",         test_have_timer);
 590     g_test_add_func("/throttle/detach_attach",      test_detach_attach);
 591     g_test_add_func("/throttle/config/enabled",     test_enabled);
 592     g_test_add_func("/throttle/config/conflicting", test_conflicting_config);
 593     g_test_add_func("/throttle/config/is_valid",    test_is_valid);
 594     g_test_add_func("/throttle/config_functions",   test_config_functions);
 595     g_test_add_func("/throttle/accounting",         test_accounting);
 596     g_test_add_func("/throttle/groups",             test_groups);
 597     return g_test_run();
 598 }
 599