memory_pressure.tproj/memory_pressure.c

   1 /*
   2  * Copyright (c) 2013-2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <getopt.h>
  28 #include <string.h>
  29 #include <mach/i386/vm_param.h>
  30 #include <sys/kern_memorystatus.h>
  31 #include <sys/sysctl.h>
  32 #include <mach/mach.h>
  33 #include <mach/task.h>
  34 #include <mach/thread_act.h>
  35 #include <mach/thread_policy.h>
  36 #include <sys/mman.h>
  37 #include <pthread.h>
  38 #include <assert.h>
  39 #include <dispatch/private.h>
  40
  41 unsigned long   phys_mem = 0;            /* amount of physical memory in bytes */
  42 unsigned int    phys_pages = 0;          /* number of physical memory pages */
  43 int             sleep_seconds = 1;
  44 int             requested_hysteresis_seconds = 0;
  45 boolean_t       quiet_mode_on = FALSE;
  46 boolean_t       simulate_mode_on = FALSE;
  47
  48 void            *range_start_addr = NULL;
  49 void            *range_end_addr = NULL;
  50 void            *range_current_addr = NULL;
  51
  52 int                     start_referencing_pages = 0;
  53 int                     start_allocing_pages = 0;
  54 pthread_cond_t          reference_pages_condvar = PTHREAD_COND_INITIALIZER;
  55 pthread_mutex_t         reference_pages_mutex = PTHREAD_MUTEX_INITIALIZER;
  56 unsigned int            desired_level = 0, desired_percent = 0;
  57 unsigned int            percent_for_level = 0;
  58 int                     tool_mode = 0;
  59
  60 #define TOOL_MODE_FOR_PERCENT   1
  61 #define TOOL_MODE_FOR_LEVEL     2
  62
  63
  64 char            random_data[] = "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";
  65
  66 #define PAGE_OP_ALLOC   0x1
  67 #define PAGE_OP_FREE    0x2
  68
  69 #define USE_WIRED_PAGES_FOR_PERCENT_MODE        FALSE
  70
  71 #define MAX_RANGE_SIZE  64 * 1024 * 1024 * 1024ULL
  72
  73 void print_vm_statistics(void);
  74 void munch_for_level(unsigned int, unsigned int);
  75 void munch_for_percentage(unsigned int, unsigned int, unsigned int);
  76
  77 static void
  78 usage(void)
  79 {
  80         fprintf(stderr, "Usage: memory_pressure [options] [<pages>]\n"
  81                         "  Allocate memory and wait forever.\n"
  82                         "  Options include:\n"
  83                         "  -l <level>            - allocate memory until a low memory notification is received (warn OR critical)\n"
  84                         "  -p <percent-free>     - allocate memory until percent free is this (or less)\n"
  85                         "  -s <seconds>          - how long to sleep between checking for a set percent level\n"
  86                         "  -w <percent-free>     - don't allocate, just wait until percent free is this then exit\n"
  87                         "  -y <seconds>          - Hysteresis Interval: how long to wait after requested percntage free is reached, before exiting program. Requires the usage of the -p option\n"
  88                         "  -v <print VM stats>   - print VM statistics every sampling interval\n"
  89                         "  -Q <quiet mode>       - reduces the tool's output\n"
  90                         "  -S                    - simulate the system's memory pressure level without applying any real pressure\n"
  91                         "  \n"
  92                );
  93         exit(0);
  94 }
  95
  96 static unsigned int
  97 read_sysctl_int(const char* name)
  98 {
  99         unsigned int var;
 100         size_t var_size;
 101         int error;
 102
 103         var_size = sizeof(var);
 104         error = sysctlbyname(name, &var, &var_size, NULL, 0);
 105         if( error ) {
 106                 perror(name);
 107                 exit(-1);
 108         }
 109         return var;
 110 }
 111
 112 static int
 113 get_percent_free(unsigned int* level)
 114 {
 115         int error;
 116
 117         error = memorystatus_get_level((user_addr_t) level);
 118
 119         if( error ) {
 120                 perror("memorystatus_get_level failed:");
 121                 exit(-1);
 122         }
 123         return error;
 124 }
 125
 126 void
 127 print_vm_statistics(void)
 128 {
 129         unsigned int count = HOST_VM_INFO64_COUNT;
 130         kern_return_t ret = 0;
 131         vm_statistics64_data_t vm_stat;;
 132
 133         if (quiet_mode_on == TRUE) {
 134                 return;
 135         }
 136
 137         if ((ret = host_statistics64(mach_host_self(), HOST_VM_INFO64, (host_info64_t)&vm_stat, &count) != KERN_SUCCESS)) {
 138                 fprintf(stderr, "Failed to get statistics. Error %d\n", ret);
 139         } else {
 140                 printf("\nStats: \n");
 141                 printf("Pages free: %llu \n", (uint64_t) (vm_stat.free_count - vm_stat.speculative_count));
 142                 printf("Pages purgeable: %llu \n",  (uint64_t) (vm_stat.purgeable_count));
 143                 printf("Pages purged: %llu \n",(uint64_t) (vm_stat.purges));
 144
 145                 printf("\nSwap I/O:\n");
 146                 printf("Swapins: %llu \n", (uint64_t) (vm_stat.swapins));
 147                 printf("Swapouts: %llu \n", (uint64_t) (vm_stat.swapouts));
 148
 149                 printf("\nPage Q counts:\n");
 150                 printf("Pages active: %llu \n", (uint64_t) (vm_stat.active_count));
 151                 printf("Pages inactive: %llu \n", (uint64_t) (vm_stat.inactive_count));
 152                 printf("Pages speculative: %llu \n", (uint64_t) (vm_stat.speculative_count));
 153                 printf("Pages throttled: %llu \n", (uint64_t) (vm_stat.throttled_count));
 154                 printf("Pages wired down: %llu \n", (uint64_t) (vm_stat.wire_count));
 155
 156                 printf("\nCompressor Stats:\n");
 157                 printf("Pages used by compressor: %llu \n", (uint64_t) (vm_stat.compressor_page_count));
 158                 printf("Pages decompressed: %llu \n", (uint64_t) (vm_stat.decompressions));
 159                 printf("Pages compressed: %llu \n", (uint64_t) (vm_stat.compressions));
 160
 161                 printf("\nFile I/O:\n");
 162                 printf("Pageins: %llu \n", (uint64_t) (vm_stat.pageins));
 163                 printf("Pageouts: %llu \n", (uint64_t) (vm_stat.pageouts));
 164
 165 #if 0
 166                 printf("\"Translation faults\": %llu \n", (uint64_t) (vm_stat.faults));
 167                 printf("Pages copy-on-write: %llu \n", (uint64_t) (vm_stat.cow_faults));
 168                 printf("Pages zero filled: %llu \n", (uint64_t) (vm_stat.zero_fill_count));
 169                 printf("Pages reactivated: %llu \n", (uint64_t) (vm_stat.reactivations));
 170 #endif
 171                 printf("\n");
 172         }
 173 }
 174
 175 static int
 176 reached_or_bypassed_desired_result(void)
 177 {
 178         if (tool_mode == TOOL_MODE_FOR_LEVEL) {
 179
 180                 unsigned int    current_level = 0;
 181
 182                 current_level = read_sysctl_int("kern.memorystatus_vm_pressure_level");
 183
 184                 if (desired_level > 0 && current_level >= desired_level) {
 185                        return 1;
 186                 }
 187
 188                 return 0;
 189         }
 190
 191         if (tool_mode == TOOL_MODE_FOR_PERCENT) {
 192
 193                 unsigned int current_percent = 0;
 194
 195                 get_percent_free(&current_percent);
 196
 197                 if (desired_percent > 0 && current_percent <= desired_percent) {
 198                         return 1;
 199                 }
 200
 201                 return 0;
 202         }
 203
 204         return 0;
 205 }
 206
 207 static void
 208 reference_pages(int level)
 209 {
 210         int     error;
 211         void    *addr = NULL;
 212         int     num_pages = 0;
 213
 214         error = pthread_mutex_lock(&reference_pages_mutex);
 215         addr = range_start_addr;
 216 again:
 217         while(start_referencing_pages == 0) {
 218                 error = pthread_cond_wait(&reference_pages_condvar, &reference_pages_mutex);
 219         }
 220
 221         start_allocing_pages = 0;
 222         pthread_mutex_unlock(&reference_pages_mutex);
 223
 224         num_pages = 0;
 225         for(; addr < range_current_addr;) {
 226
 227                 char p;
 228
 229                 if (reached_or_bypassed_desired_result()) {
 230                         //printf("stopped referencing after %d pages\n", num_pages);
 231                         break;
 232                 }
 233
 234                 p = *(char*) addr;
 235                 addr += PAGE_SIZE;
 236                 num_pages++;
 237
 238         }
 239
 240         //if (num_pages) {
 241         //      printf("Referenced %d\n", num_pages);
 242         //}
 243         error = pthread_mutex_lock(&reference_pages_mutex);
 244         start_referencing_pages = 0;
 245         start_allocing_pages = 1;
 246
 247         goto again;
 248 }
 249
 250 static void
 251 process_pages(int num_pages, int page_op)
 252 {
 253         if (num_pages > 0) {
 254
 255                 int     error = 0, i = 0;
 256                 size_t  size = num_pages * PAGE_SIZE;
 257
 258                 if (page_op == PAGE_OP_ALLOC) {
 259
 260                         if (tool_mode == TOOL_MODE_FOR_PERCENT && USE_WIRED_PAGES_FOR_PERCENT_MODE) {
 261                                 error = mlock(range_current_addr, size);
 262                                 if (error == -1) {
 263                                         perror("Failed to lock memory!");
 264                                         exit(-1);
 265                                 }
 266
 267                                 memset(range_current_addr, 0xFF, size);
 268                                 range_current_addr += size;
 269
 270                         } else {
 271
 272                                 pthread_mutex_lock(&reference_pages_mutex);
 273                                 while (start_allocing_pages == 0) {
 274                                         pthread_mutex_unlock(&reference_pages_mutex);
 275                                         sleep(1);
 276                                         pthread_mutex_lock(&reference_pages_mutex);
 277                                 }
 278                                 pthread_mutex_unlock(&reference_pages_mutex);
 279
 280                                 for (i=0; i < num_pages; i++) {
 281
 282                                         if (reached_or_bypassed_desired_result()) {
 283                                                 //printf("stopped faulting after %d pages\n", i);
 284                                                 break;
 285                                         }
 286
 287                                         memcpy(range_current_addr, random_data, PAGE_SIZE);
 288                                         range_current_addr += PAGE_SIZE;
 289                                 }
 290
 291                                 pthread_mutex_lock(&reference_pages_mutex);
 292                                 start_referencing_pages = 1;
 293                                 pthread_cond_signal(&reference_pages_condvar);
 294                                 pthread_mutex_unlock(&reference_pages_mutex);
 295                         }
 296                 } else {
 297                         if (tool_mode == TOOL_MODE_FOR_PERCENT && USE_WIRED_PAGES_FOR_PERCENT_MODE) {
 298                                 error = munlock(range_current_addr, size);
 299                                 if (error == -1) {
 300                                         perror("Failed to unlock memory!");
 301                                         exit(-1);
 302                                 }
 303
 304                                 error = madvise(range_current_addr, size, MADV_FREE);
 305                                 if (error == -1) {
 306                                         perror("Failed to madv_free memory!");
 307                                         exit(-1);
 308                                 }
 309
 310                                 range_current_addr -= size;
 311
 312                         } else {
 313                                 pthread_mutex_lock(&reference_pages_mutex);
 314                                 while (start_referencing_pages == 1) {
 315                                         pthread_mutex_unlock(&reference_pages_mutex);
 316                                         sleep(1);
 317                                         pthread_mutex_lock(&reference_pages_mutex);
 318                                 }
 319
 320                                 error = madvise(range_current_addr, size, MADV_FREE);
 321                                 if (error == -1) {
 322                                         perror("Failed to madv_free memory!");
 323                                         exit(-1);
 324                                 }
 325                                 range_current_addr -= size;
 326                                 start_referencing_pages = 1;
 327                                 pthread_cond_signal(&reference_pages_condvar);
 328                                 pthread_mutex_unlock(&reference_pages_mutex);
 329                         }
 330                 }
 331         }
 332 }
 333
 334 void
 335 munch_for_level(unsigned int sleep_seconds, unsigned int print_vm_stats)
 336 {
 337
 338         unsigned int    current_level = 0;
 339         unsigned int    desired_percent = 0;
 340         unsigned int    current_percent = 0;
 341         unsigned int    page_op = PAGE_OP_ALLOC;
 342         unsigned int    previous_page_op = PAGE_OP_ALLOC;
 343         unsigned int    pages_to_process = 0;
 344         unsigned int    stabilized_percentage = 0;
 345         boolean_t       print_vm_stats_on_page_processing = FALSE;
 346         boolean_t       ok_to_print_stablity_message = TRUE;
 347
 348         current_level =  read_sysctl_int("kern.memorystatus_vm_pressure_level");
 349
 350         if (current_level >= desired_level) {
 351                 return;
 352         }
 353
 354         get_percent_free(&current_percent);
 355
 356         if (print_vm_stats) {
 357                 print_vm_stats_on_page_processing = TRUE;
 358         }
 359
 360         page_op = PAGE_OP_ALLOC;
 361         previous_page_op = 0;
 362
 363         while (1) {
 364
 365                         if (current_percent > percent_for_level) {
 366                                 desired_percent = current_percent - percent_for_level;
 367                         } else {
 368                                 desired_percent = 1;
 369                         }
 370
 371                         pages_to_process = (desired_percent * phys_pages) / 100;
 372
 373                         page_op = PAGE_OP_ALLOC;
 374
 375                         if (previous_page_op != page_op) {
 376                                 //printf("%s %d pages.\n", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", pages_to_process);
 377                                 printf("\nCMD: %s pages to go from level: %d to level: %d", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", current_level, desired_level);
 378                                 previous_page_op = page_op;
 379                                 fflush(stdout);
 380                         } else {
 381                                 printf(".");
 382                                 fflush(stdout);
 383                         }
 384
 385                         if (print_vm_stats_on_page_processing == TRUE) {
 386                                 print_vm_statistics();
 387                         }
 388                         process_pages(pages_to_process, page_op);
 389                         ok_to_print_stablity_message = TRUE;
 390
 391                         current_level =  read_sysctl_int("kern.memorystatus_vm_pressure_level");
 392
 393                         if (current_level >= desired_level) {
 394
 395                                 while(1) {
 396                                         current_level =  read_sysctl_int("kern.memorystatus_vm_pressure_level");
 397                                         if (current_level < desired_level) {
 398                                                 break;
 399                                         }
 400
 401                                         if (current_level > desired_level) {
 402                                                 page_op = PAGE_OP_FREE;
 403
 404                                                 get_percent_free(&current_percent);
 405
 406                                                 if (stabilized_percentage > current_percent) {
 407                                                         pages_to_process = ((stabilized_percentage - current_percent) * phys_pages) / 100;
 408
 409                                                         if (previous_page_op != page_op) {
 410                                                                 printf("\nCMD: %s pages to go from %d to %d level", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", current_level, desired_level);
 411                                                                 previous_page_op = page_op;
 412                                                                 fflush(stdout);
 413                                                         } else {
 414                                                                 printf(".");
 415                                                                 fflush(stdout);
 416                                                         }
 417
 418                                                         if (print_vm_stats_on_page_processing == TRUE) {
 419                                                                 print_vm_statistics();
 420                                                         }
 421                                                         process_pages(pages_to_process, page_op);
 422                                                         ok_to_print_stablity_message = TRUE;
 423                                                 }
 424                                         }
 425
 426                                         while (current_level == desired_level) {
 427                                                 get_percent_free(&current_percent);
 428                                                 if (ok_to_print_stablity_message == TRUE) {
 429                                                         print_vm_statistics();
 430                                                         printf("\nStabilizing at Percent: %d Level: %d", current_percent, current_level);
 431                                                         fflush(stdout);
 432                                                         ok_to_print_stablity_message = FALSE;
 433                                                         previous_page_op = 0;
 434                                                 } else {
 435                                                         printf(".");
 436                                                         fflush(stdout);
 437                                                 }
 438
 439                                                 stabilized_percentage = current_percent;
 440                                                 sleep(sleep_seconds);
 441                                                 current_level =  read_sysctl_int("kern.memorystatus_vm_pressure_level");
 442                                         }
 443                                 }
 444                         }
 445
 446                         get_percent_free(&current_percent);
 447                         //printf("Percent: %d Level: %d\n", current_percent, current_level);
 448                         sleep(1);
 449
 450                         if (print_vm_stats) {
 451                                 print_vm_stats_on_page_processing = TRUE;
 452                         }
 453
 454         } /* while */
 455 }
 456
 457 void
 458 munch_for_percentage(unsigned int sleep_seconds, unsigned int wait_percent_free, unsigned int print_vm_stats)
 459 {
 460
 461         int             total_pages_allocated = 0;
 462         int             current_stable_timer = 0;       /* in seconds */
 463         unsigned int    current_percent = 0;
 464         boolean_t       page_op = PAGE_OP_FREE;
 465         unsigned int    pages_to_process = 0;
 466         boolean_t       print_vm_stats_on_page_processing = FALSE;
 467         boolean_t       previous_page_op = 0;
 468         boolean_t       ok_to_print_stablity_message = TRUE;
 469
 470         /* Allocate until memory level is hit. */
 471
 472         get_percent_free(&current_percent);
 473
 474         /*
 475          * "wait" mode doesn't alloc, it just waits and exits.  This is used
 476          * while waiting for *other* processes to allocate memory.
 477          */
 478         if (wait_percent_free) {
 479                 while (current_percent > wait_percent_free) {
 480                         sleep(sleep_seconds);
 481                         get_percent_free (&current_percent);
 482                 }
 483                 return;
 484         }
 485
 486         page_op = PAGE_OP_ALLOC;
 487         previous_page_op = 0;
 488
 489         while (1) {
 490
 491                 if (current_percent > desired_percent) {
 492                         pages_to_process = ((current_percent - desired_percent) * phys_pages) / 100;
 493                         page_op = PAGE_OP_ALLOC;
 494                 } else {
 495                         pages_to_process = ((desired_percent - current_percent) * phys_pages) / 100;
 496                         page_op = PAGE_OP_FREE;
 497                 }
 498
 499                 if (pages_to_process > 0) {
 500
 501                         if (page_op != previous_page_op) {
 502                                 //printf("\n%s %d pages to go from %d%% to %d%% pages free\n", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", pages_to_process, current_percent, desired_percent);
 503                                 printf("\nCMD: %s pages to go from %d%% to %d%% percent free", (page_op == PAGE_OP_ALLOC) ? "Allocating" : "Freeing", current_percent, desired_percent);
 504                                 fflush(stdout);
 505                                 previous_page_op = page_op;
 506                         } else {
 507                                 printf(".");
 508                                 fflush(stdout);
 509                         }
 510
 511                         if (page_op == PAGE_OP_ALLOC) {
 512                                 total_pages_allocated += pages_to_process;
 513                                 process_pages(pages_to_process, page_op);
 514                                 ok_to_print_stablity_message = TRUE;
 515                         } else {
 516
 517                                 if (total_pages_allocated >= pages_to_process) {
 518                                         total_pages_allocated -= pages_to_process;
 519                                         process_pages(pages_to_process, page_op);
 520                                         ok_to_print_stablity_message = TRUE;
 521                                 } else {
 522                                         get_percent_free(&current_percent);
 523                                         if (ok_to_print_stablity_message == TRUE) {
 524                                                 printf("\nDesired Percent: %d, Current Percent: %d. No pages to free so waiting", desired_percent, current_percent);
 525                                                 fflush(stdout);
 526                                                 ok_to_print_stablity_message = FALSE;
 527                                         }
 528                                 }
 529                         }
 530
 531                         //printf("kernel memorystatus: %d%% free, allocated %d pages total. Requested: %d\n", current_percent, total_pages_allocated, desired_percent);
 532                         if (print_vm_stats) {
 533                                 print_vm_stats_on_page_processing = TRUE;
 534                         }
 535                 } else {
 536                         if (ok_to_print_stablity_message == TRUE) {
 537                                 print_vm_statistics();
 538                                 printf("\nStable at percent free: %d", current_percent);
 539                                 fflush(stdout);
 540                                 ok_to_print_stablity_message = FALSE;
 541                         } else {
 542                                 printf(".");
 543                                 fflush(stdout);
 544                         }
 545
 546                         /* Stability has been reached; Increment current_stable_timer by sleep_seconds */
 547
 548                         if (current_stable_timer <= requested_hysteresis_seconds){
 549                                 current_stable_timer += sleep_seconds;
 550                                 /* Debug only */
 551                                 /* printf("\n Percentage Free stable for %d seconds", current_stable_timer); */
 552                         } else {
 553                                 printf ("\n Maintained memory pressure to %d percent free for more than %d seconds. Stopping pressure now.", current_percent, requested_hysteresis_seconds);
 554                                 return;
 555                         }
 556
 557                         print_vm_stats_on_page_processing = FALSE;
 558                 }
 559
 560                 if (print_vm_stats_on_page_processing) {
 561
 562                         print_vm_statistics();
 563
 564                         if (print_vm_stats_on_page_processing == TRUE) {
 565                                 print_vm_stats_on_page_processing = FALSE;
 566                         }
 567                 }
 568
 569                 sleep(sleep_seconds);
 570
 571                 get_percent_free(&current_percent);
 572         } /* while */
 573 }
 574
 575 int
 576 main(int argc, char * const argv[])
 577 {
 578         int opt;
 579         unsigned int wait_percent_free = 0;
 580         unsigned int current_percent = 0;
 581         unsigned int print_vm_stats = 0;
 582         char         level[10];
 583
 584         while ((opt = getopt(argc, argv, "hl:p:s:w:y:vQS")) != -1) {
 585                 switch (opt) {
 586                         case 'h':
 587                                 usage();
 588                                 break;
 589                         case 'l':
 590                                 strlcpy(level, optarg, 9);
 591
 592                                 if (strncasecmp(level, "normal", 6) == 0) {
 593                                         desired_level = DISPATCH_MEMORYPRESSURE_NORMAL;
 594                                         percent_for_level = 90;
 595                                 } else if (strncasecmp(level, "warn", 4) == 0) {
 596                                         desired_level = DISPATCH_MEMORYPRESSURE_WARN;
 597                                         percent_for_level = 60;
 598
 599                                 } else if (strncasecmp(level, "critical", 8) == 0) {
 600                                         desired_level = DISPATCH_MEMORYPRESSURE_CRITICAL;
 601                                         percent_for_level = 30;
 602
 603                                 } else {
 604                                         printf("Incorrect level. Allowed \"normal\" or \"warn\" or \"critical\". Specified: %s\n", level);
 605                                         exit(0);
 606                                 }
 607                                 break;
 608                         case 'p':
 609                                 desired_percent = atoi(optarg);
 610                                 break;
 611                         case 's':
 612                                 sleep_seconds = atoi(optarg);
 613                                 break;
 614                         case 'w':
 615                                 wait_percent_free = atoi(optarg);
 616                                 break;
 617                         case 'y':
 618                                 requested_hysteresis_seconds = atoi(optarg);
 619                                 break;
 620                         case 'v':
 621                                 print_vm_stats = 1;
 622                                 break;
 623                         case 'Q':
 624                                 quiet_mode_on = TRUE;
 625                                 break;
 626                         case 'S':
 627                                 simulate_mode_on = TRUE;
 628                                 break;
 629                         default:
 630                                 usage();
 631                 }
 632         }
 633
 634         if (simulate_mode_on == TRUE && desired_level == 0) {
 635                 printf("Expected level with -l along with \"simulated\" mode.\n");
 636                 return 0;
 637         }
 638
 639         if (requested_hysteresis_seconds > 0) {
 640                 if (desired_percent == 0) {
 641                         printf("Hysteresis time may only be specified in conjunction with a non-zero value for the -p option. \n");
 642                         usage();
 643                 }
 644         }
 645
 646         phys_mem   = read_sysctl_int("hw.physmem");
 647         phys_pages = (unsigned int) (phys_mem / PAGE_SIZE);
 648
 649         printf("The system has %lu (%d pages with a page size of %d).\n", phys_mem, phys_pages, PAGE_SIZE);
 650
 651         print_vm_statistics();
 652
 653         get_percent_free(&current_percent);
 654         printf("System-wide memory free percentage: %d%%\n", current_percent);
 655
 656         if (desired_percent == 0 && wait_percent_free == 0 && desired_level == 0) {
 657                 return 0;
 658         }
 659
 660         if (simulate_mode_on == TRUE) {
 661
 662                 /*
 663                         We use the sysctl "kern.memorypressure_manual_trigger" for this mode. Here's a blurb:
 664
 665                         Supported behaviors when using the manual trigger tests.
 666
 667                         #define TEST_LOW_MEMORY_TRIGGER_ONE             1       most suitable app is notified
 668                         #define TEST_LOW_MEMORY_TRIGGER_ALL             2       all apps are notified
 669                         #define TEST_PURGEABLE_TRIGGER_ONE              3
 670                         #define TEST_PURGEABLE_TRIGGER_ALL              4
 671                         #define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ONE   5
 672                         #define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL   6
 673
 674                         So, for example, to simulate one app getting a poke when the "pressure" reaches critical levels: "sudo sysctl -w kern.memorypressure_manual_trigger = level"
 675                         where level is calculated as: ((TEST_LOW_MEMORY_TRIGGER_ONE << 16) | NOTE_MEMORYSTATUS_PRESSURE_CRITICAL), which will be "65540".
 676
 677                         For this tool, currently, we only support the "TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL" options.
 678                 */
 679
 680 #define TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL   6
 681
 682                 unsigned int var = 0;
 683                 size_t var_size = 0;
 684                 int error = 0;
 685
 686                 var_size = sizeof(var);
 687
 688                 var = ((TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL << 16) | desired_level);
 689
 690                 error = sysctlbyname("kern.memorypressure_manual_trigger", NULL, 0, &var, var_size);
 691
 692                 if(error) {
 693                         perror("sysctl: kern.memorypressure_manual_trigger failed ");
 694                         exit(-1);
 695                 }
 696
 697                 printf("Waiting %d seconds before resetting system state\n", sleep_seconds);
 698
 699                 sleep(sleep_seconds);
 700
 701                 var_size = sizeof(var);
 702
 703                 var = ((TEST_LOW_MEMORY_PURGEABLE_TRIGGER_ALL << 16) | DISPATCH_MEMORYPRESSURE_NORMAL);
 704
 705                 error = sysctlbyname("kern.memorypressure_manual_trigger", NULL, 0, &var, var_size);
 706
 707                 if(error) {
 708                         perror("sysctl: kern.memorypressure_manual_trigger failed ");
 709                         exit(-1);
 710                 }
 711
 712                 printf("Reset system state\n");
 713
 714         } else {
 715                 range_start_addr = mmap(NULL, MAX_RANGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, 0);
 716
 717                 if (range_start_addr == MAP_FAILED) {
 718                         perror("mmap failed");
 719                 } else {
 720
 721                         int             error = 0;
 722                         pthread_t       thread = NULL;
 723
 724                         error = pthread_create(&thread, NULL, (void*) reference_pages, NULL);
 725
 726                         range_current_addr = range_start_addr;
 727                         range_end_addr = range_start_addr + MAX_RANGE_SIZE;
 728                         start_allocing_pages = 1;
 729
 730                         if (desired_level) {
 731                                 tool_mode = TOOL_MODE_FOR_LEVEL;
 732                                 munch_for_level(sleep_seconds, print_vm_stats);
 733                         } else {
 734                                 tool_mode = TOOL_MODE_FOR_PERCENT;
 735                                 munch_for_percentage(sleep_seconds, wait_percent_free, print_vm_stats);
 736                         }
 737                 }
 738         }
 739
 740         return 0;
 741 }