kern_malloc.c revision 1.62.2.1
1 /* $NetBSD: kern_malloc.c,v 1.62.2.1 2001/10/01 12:46:50 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1987, 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)kern_malloc.c 8.4 (Berkeley) 5/20/95 37 */ 38 39 #include "opt_lockdebug.h" 40 41 #include <sys/param.h> 42 #include <sys/proc.h> 43 #include <sys/map.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/systm.h> 47 48 #include <uvm/uvm_extern.h> 49 50 static struct vm_map kmem_map_store; 51 struct vm_map *kmem_map = NULL; 52 53 #include "opt_kmempages.h" 54 55 #ifdef NKMEMCLUSTERS 56 #error NKMEMCLUSTERS is obsolete; remove it from your kernel config file and use NKMEMPAGES instead or let the kernel auto-size 57 #endif 58 59 /* 60 * Default number of pages in kmem_map. We attempt to calculate this 61 * at run-time, but allow it to be either patched or set in the kernel 62 * config file. 63 */ 64 #ifndef NKMEMPAGES 65 #define NKMEMPAGES 0 66 #endif 67 int nkmempages = NKMEMPAGES; 68 69 /* 70 * Defaults for lower- and upper-bounds for the kmem_map page count. 71 * Can be overridden by kernel config options. 72 */ 73 #ifndef NKMEMPAGES_MIN 74 #define NKMEMPAGES_MIN NKMEMPAGES_MIN_DEFAULT 75 #endif 76 77 #ifndef NKMEMPAGES_MAX 78 #define NKMEMPAGES_MAX NKMEMPAGES_MAX_DEFAULT 79 #endif 80 81 #include "opt_kmemstats.h" 82 #include "opt_malloclog.h" 83 84 struct kmembuckets bucket[MINBUCKET + 16]; 85 struct kmemstats kmemstats[M_LAST]; 86 struct kmemusage *kmemusage; 87 char *kmembase, *kmemlimit; 88 const char * const memname[] = INITKMEMNAMES; 89 90 #ifdef MALLOCLOG 91 #ifndef MALLOCLOGSIZE 92 #define MALLOCLOGSIZE 100000 93 #endif 94 95 struct malloclog { 96 void *addr; 97 long size; 98 int type; 99 int action; 100 const char *file; 101 long line; 102 } malloclog[MALLOCLOGSIZE]; 103 104 long malloclogptr; 105 106 static void domlog __P((void *a, long size, int type, int action, 107 const char *file, long line)); 108 static void hitmlog __P((void *a)); 109 110 static void 111 domlog(a, size, type, action, file, line) 112 void *a; 113 long size; 114 int type; 115 int action; 116 const char *file; 117 long line; 118 { 119 120 malloclog[malloclogptr].addr = a; 121 malloclog[malloclogptr].size = size; 122 malloclog[malloclogptr].type = type; 123 malloclog[malloclogptr].action = action; 124 malloclog[malloclogptr].file = file; 125 malloclog[malloclogptr].line = line; 126 malloclogptr++; 127 if (malloclogptr >= MALLOCLOGSIZE) 128 malloclogptr = 0; 129 } 130 131 static void 132 hitmlog(a) 133 void *a; 134 { 135 struct malloclog *lp; 136 long l; 137 138 #define PRT \ 139 if (malloclog[l].addr == a && malloclog[l].action) { \ 140 lp = &malloclog[l]; \ 141 printf("malloc log entry %ld:\n", l); \ 142 printf("\taddr = %p\n", lp->addr); \ 143 printf("\tsize = %ld\n", lp->size); \ 144 printf("\ttype = %s\n", memname[lp->type]); \ 145 printf("\taction = %s\n", lp->action == 1 ? "alloc" : "free"); \ 146 printf("\tfile = %s\n", lp->file); \ 147 printf("\tline = %ld\n", lp->line); \ 148 } 149 150 for (l = malloclogptr; l < MALLOCLOGSIZE; l++) 151 PRT 152 153 for (l = 0; l < malloclogptr; l++) 154 PRT 155 } 156 #endif /* MALLOCLOG */ 157 158 #ifdef DIAGNOSTIC 159 /* 160 * This structure provides a set of masks to catch unaligned frees. 161 */ 162 const long addrmask[] = { 0, 163 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 164 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 165 0x000001ff, 0x000003ff, 0x000007ff, 0x00000fff, 166 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff, 167 }; 168 169 /* 170 * The WEIRD_ADDR is used as known text to copy into free objects so 171 * that modifications after frees can be detected. 172 */ 173 #define WEIRD_ADDR ((unsigned) 0xdeadbeef) 174 #ifdef DEBUG 175 #define MAX_COPY PAGE_SIZE 176 #else 177 #define MAX_COPY 32 178 #endif 179 180 /* 181 * Normally the freelist structure is used only to hold the list pointer 182 * for free objects. However, when running with diagnostics, the first 183 * 8 bytes of the structure is unused except for diagnostic information, 184 * and the free list pointer is at offst 8 in the structure. Since the 185 * first 8 bytes is the portion of the structure most often modified, this 186 * helps to detect memory reuse problems and avoid free list corruption. 187 */ 188 struct freelist { 189 int32_t spare0; 190 int16_t type; 191 int16_t spare1; 192 caddr_t next; 193 }; 194 #else /* !DIAGNOSTIC */ 195 struct freelist { 196 caddr_t next; 197 }; 198 #endif /* DIAGNOSTIC */ 199 200 /* 201 * Allocate a block of memory 202 */ 203 #ifdef MALLOCLOG 204 void * 205 _malloc(size, type, flags, file, line) 206 unsigned long size; 207 int type, flags; 208 const char *file; 209 long line; 210 #else 211 void * 212 malloc(size, type, flags) 213 unsigned long size; 214 int type, flags; 215 #endif /* MALLOCLOG */ 216 { 217 struct kmembuckets *kbp; 218 struct kmemusage *kup; 219 struct freelist *freep; 220 long indx, npg, allocsize; 221 int s; 222 caddr_t va, cp, savedlist; 223 #ifdef DIAGNOSTIC 224 int32_t *end, *lp; 225 int copysize; 226 const char *savedtype; 227 #endif 228 #ifdef KMEMSTATS 229 struct kmemstats *ksp = &kmemstats[type]; 230 231 if (__predict_false(((unsigned long)type) > M_LAST)) 232 panic("malloc - bogus type"); 233 #endif 234 #ifdef LOCKDEBUG 235 if ((flags & M_NOWAIT) == 0) 236 simple_lock_only_held(NULL, "malloc"); 237 #endif 238 #ifdef MALLOC_DEBUG 239 if (debug_malloc(size, type, flags, (void **) &va)) 240 return ((void *) va); 241 #endif 242 indx = BUCKETINDX(size); 243 kbp = &bucket[indx]; 244 s = splvm(); 245 #ifdef KMEMSTATS 246 while (ksp->ks_memuse >= ksp->ks_limit) { 247 if (flags & M_NOWAIT) { 248 splx(s); 249 return ((void *) NULL); 250 } 251 if (ksp->ks_limblocks < 65535) 252 ksp->ks_limblocks++; 253 tsleep((caddr_t)ksp, PSWP+2, memname[type], 0); 254 } 255 ksp->ks_size |= 1 << indx; 256 #endif 257 #ifdef DIAGNOSTIC 258 copysize = 1 << indx < MAX_COPY ? 1 << indx : MAX_COPY; 259 #endif 260 if (kbp->kb_next == NULL) { 261 kbp->kb_last = NULL; 262 if (size > MAXALLOCSAVE) 263 allocsize = roundup(size, PAGE_SIZE); 264 else 265 allocsize = 1 << indx; 266 npg = btoc(allocsize); 267 va = (caddr_t) uvm_km_kmemalloc(kmem_map, NULL, 268 (vsize_t)ctob(npg), 269 (flags & M_NOWAIT) ? UVM_KMF_NOWAIT : 0); 270 if (__predict_false(va == NULL)) { 271 /* 272 * Kmem_malloc() can return NULL, even if it can 273 * wait, if there is no map space avaiable, because 274 * it can't fix that problem. Neither can we, 275 * right now. (We should release pages which 276 * are completely free and which are in buckets 277 * with too many free elements.) 278 */ 279 if ((flags & M_NOWAIT) == 0) 280 panic("malloc: out of space in kmem_map"); 281 splx(s); 282 return ((void *) NULL); 283 } 284 #ifdef KMEMSTATS 285 kbp->kb_total += kbp->kb_elmpercl; 286 #endif 287 kup = btokup(va); 288 kup->ku_indx = indx; 289 if (allocsize > MAXALLOCSAVE) { 290 if (npg > 65535) 291 panic("malloc: allocation too large"); 292 kup->ku_pagecnt = npg; 293 #ifdef KMEMSTATS 294 ksp->ks_memuse += allocsize; 295 #endif 296 goto out; 297 } 298 #ifdef KMEMSTATS 299 kup->ku_freecnt = kbp->kb_elmpercl; 300 kbp->kb_totalfree += kbp->kb_elmpercl; 301 #endif 302 /* 303 * Just in case we blocked while allocating memory, 304 * and someone else also allocated memory for this 305 * bucket, don't assume the list is still empty. 306 */ 307 savedlist = kbp->kb_next; 308 kbp->kb_next = cp = va + (npg << PAGE_SHIFT) - allocsize; 309 for (;;) { 310 freep = (struct freelist *)cp; 311 #ifdef DIAGNOSTIC 312 /* 313 * Copy in known text to detect modification 314 * after freeing. 315 */ 316 end = (int32_t *)&cp[copysize]; 317 for (lp = (int32_t *)cp; lp < end; lp++) 318 *lp = WEIRD_ADDR; 319 freep->type = M_FREE; 320 #endif /* DIAGNOSTIC */ 321 if (cp <= va) 322 break; 323 cp -= allocsize; 324 freep->next = cp; 325 } 326 freep->next = savedlist; 327 if (kbp->kb_last == NULL) 328 kbp->kb_last = (caddr_t)freep; 329 } 330 va = kbp->kb_next; 331 kbp->kb_next = ((struct freelist *)va)->next; 332 #ifdef DIAGNOSTIC 333 freep = (struct freelist *)va; 334 savedtype = (unsigned)freep->type < M_LAST ? 335 memname[freep->type] : "???"; 336 if (kbp->kb_next) { 337 int rv; 338 vaddr_t addr = (vaddr_t)kbp->kb_next; 339 340 vm_map_lock(kmem_map); 341 rv = uvm_map_checkprot(kmem_map, addr, 342 addr + sizeof(struct freelist), 343 VM_PROT_WRITE); 344 vm_map_unlock(kmem_map); 345 346 if (__predict_false(rv == 0)) { 347 printf( 348 "%s %ld of object %p size %ld %s %s (invalid addr %p)\n", 349 "Data modified on freelist: word", 350 (long)((int32_t *)&kbp->kb_next - (int32_t *)kbp), 351 va, size, "previous type", savedtype, kbp->kb_next); 352 #ifdef MALLOCLOG 353 hitmlog(va); 354 #endif 355 kbp->kb_next = NULL; 356 } 357 } 358 359 /* Fill the fields that we've used with WEIRD_ADDR */ 360 #if BYTE_ORDER == BIG_ENDIAN 361 freep->type = WEIRD_ADDR >> 16; 362 #endif 363 #if BYTE_ORDER == LITTLE_ENDIAN 364 freep->type = (short)WEIRD_ADDR; 365 #endif 366 end = (int32_t *)&freep->next + 367 (sizeof(freep->next) / sizeof(int32_t)); 368 for (lp = (int32_t *)&freep->next; lp < end; lp++) 369 *lp = WEIRD_ADDR; 370 371 /* and check that the data hasn't been modified. */ 372 end = (int32_t *)&va[copysize]; 373 for (lp = (int32_t *)va; lp < end; lp++) { 374 if (__predict_true(*lp == WEIRD_ADDR)) 375 continue; 376 printf("%s %ld of object %p size %ld %s %s (0x%x != 0x%x)\n", 377 "Data modified on freelist: word", 378 (long)(lp - (int32_t *)va), va, size, "previous type", 379 savedtype, *lp, WEIRD_ADDR); 380 #ifdef MALLOCLOG 381 hitmlog(va); 382 #endif 383 break; 384 } 385 386 freep->spare0 = 0; 387 #endif /* DIAGNOSTIC */ 388 #ifdef KMEMSTATS 389 kup = btokup(va); 390 if (kup->ku_indx != indx) 391 panic("malloc: wrong bucket"); 392 if (kup->ku_freecnt == 0) 393 panic("malloc: lost data"); 394 kup->ku_freecnt--; 395 kbp->kb_totalfree--; 396 ksp->ks_memuse += 1 << indx; 397 out: 398 kbp->kb_calls++; 399 ksp->ks_inuse++; 400 ksp->ks_calls++; 401 if (ksp->ks_memuse > ksp->ks_maxused) 402 ksp->ks_maxused = ksp->ks_memuse; 403 #else 404 out: 405 #endif 406 #ifdef MALLOCLOG 407 domlog(va, size, type, 1, file, line); 408 #endif 409 splx(s); 410 return ((void *) va); 411 } 412 413 /* 414 * Free a block of memory allocated by malloc. 415 */ 416 #ifdef MALLOCLOG 417 void 418 _free(addr, type, file, line) 419 void *addr; 420 int type; 421 const char *file; 422 long line; 423 #else 424 void 425 free(addr, type) 426 void *addr; 427 int type; 428 #endif /* MALLOCLOG */ 429 { 430 struct kmembuckets *kbp; 431 struct kmemusage *kup; 432 struct freelist *freep; 433 long size; 434 int s; 435 #ifdef DIAGNOSTIC 436 caddr_t cp; 437 int32_t *end, *lp; 438 long alloc, copysize; 439 #endif 440 #ifdef KMEMSTATS 441 struct kmemstats *ksp = &kmemstats[type]; 442 #endif 443 444 #ifdef MALLOC_DEBUG 445 if (debug_free(addr, type)) 446 return; 447 #endif 448 449 #ifdef DIAGNOSTIC 450 /* 451 * Ensure that we're free'ing something that we could 452 * have allocated in the first place. That is, check 453 * to see that the address is within kmem_map. 454 */ 455 if (__predict_false((vaddr_t)addr < kmem_map->header.start || 456 (vaddr_t)addr >= kmem_map->header.end)) 457 panic("free: addr %p not within kmem_map", addr); 458 #endif 459 460 kup = btokup(addr); 461 size = 1 << kup->ku_indx; 462 kbp = &bucket[kup->ku_indx]; 463 s = splvm(); 464 #ifdef MALLOCLOG 465 domlog(addr, 0, type, 2, file, line); 466 #endif 467 #ifdef DIAGNOSTIC 468 /* 469 * Check for returns of data that do not point to the 470 * beginning of the allocation. 471 */ 472 if (size > PAGE_SIZE) 473 alloc = addrmask[BUCKETINDX(PAGE_SIZE)]; 474 else 475 alloc = addrmask[kup->ku_indx]; 476 if (((u_long)addr & alloc) != 0) 477 panic("free: unaligned addr %p, size %ld, type %s, mask %ld\n", 478 addr, size, memname[type], alloc); 479 #endif /* DIAGNOSTIC */ 480 if (size > MAXALLOCSAVE) { 481 uvm_km_free(kmem_map, (vaddr_t)addr, ctob(kup->ku_pagecnt)); 482 #ifdef KMEMSTATS 483 size = kup->ku_pagecnt << PGSHIFT; 484 ksp->ks_memuse -= size; 485 kup->ku_indx = 0; 486 kup->ku_pagecnt = 0; 487 if (ksp->ks_memuse + size >= ksp->ks_limit && 488 ksp->ks_memuse < ksp->ks_limit) 489 wakeup((caddr_t)ksp); 490 ksp->ks_inuse--; 491 kbp->kb_total -= 1; 492 #endif 493 splx(s); 494 return; 495 } 496 freep = (struct freelist *)addr; 497 #ifdef DIAGNOSTIC 498 /* 499 * Check for multiple frees. Use a quick check to see if 500 * it looks free before laboriously searching the freelist. 501 */ 502 if (__predict_false(freep->spare0 == WEIRD_ADDR)) { 503 for (cp = kbp->kb_next; cp; 504 cp = ((struct freelist *)cp)->next) { 505 if (addr != cp) 506 continue; 507 printf("multiply freed item %p\n", addr); 508 #ifdef MALLOCLOG 509 hitmlog(addr); 510 #endif 511 panic("free: duplicated free"); 512 } 513 } 514 #ifdef LOCKDEBUG 515 /* 516 * Check if we're freeing a locked simple lock. 517 */ 518 simple_lock_freecheck(addr, (char *)addr + size); 519 #endif 520 /* 521 * Copy in known text to detect modification after freeing 522 * and to make it look free. Also, save the type being freed 523 * so we can list likely culprit if modification is detected 524 * when the object is reallocated. 525 */ 526 copysize = size < MAX_COPY ? size : MAX_COPY; 527 end = (int32_t *)&((caddr_t)addr)[copysize]; 528 for (lp = (int32_t *)addr; lp < end; lp++) 529 *lp = WEIRD_ADDR; 530 freep->type = type; 531 #endif /* DIAGNOSTIC */ 532 #ifdef KMEMSTATS 533 kup->ku_freecnt++; 534 if (kup->ku_freecnt >= kbp->kb_elmpercl) { 535 if (kup->ku_freecnt > kbp->kb_elmpercl) 536 panic("free: multiple frees"); 537 else if (kbp->kb_totalfree > kbp->kb_highwat) 538 kbp->kb_couldfree++; 539 } 540 kbp->kb_totalfree++; 541 ksp->ks_memuse -= size; 542 if (ksp->ks_memuse + size >= ksp->ks_limit && 543 ksp->ks_memuse < ksp->ks_limit) 544 wakeup((caddr_t)ksp); 545 ksp->ks_inuse--; 546 #endif 547 if (kbp->kb_next == NULL) 548 kbp->kb_next = addr; 549 else 550 ((struct freelist *)kbp->kb_last)->next = addr; 551 freep->next = NULL; 552 kbp->kb_last = addr; 553 splx(s); 554 } 555 556 /* 557 * Change the size of a block of memory. 558 */ 559 void * 560 realloc(curaddr, newsize, type, flags) 561 void *curaddr; 562 unsigned long newsize; 563 int type, flags; 564 { 565 struct kmemusage *kup; 566 long cursize; 567 void *newaddr; 568 #ifdef DIAGNOSTIC 569 long alloc; 570 #endif 571 572 /* 573 * Realloc() with a NULL pointer is the same as malloc(). 574 */ 575 if (curaddr == NULL) 576 return (malloc(newsize, type, flags)); 577 578 /* 579 * Realloc() with zero size is the same as free(). 580 */ 581 if (newsize == 0) { 582 free(curaddr, type); 583 return (NULL); 584 } 585 586 #ifdef LOCKDEBUG 587 if ((flags & M_NOWAIT) == 0) 588 simple_lock_only_held(NULL, "realloc"); 589 #endif 590 591 /* 592 * Find out how large the old allocation was (and do some 593 * sanity checking). 594 */ 595 kup = btokup(curaddr); 596 cursize = 1 << kup->ku_indx; 597 598 #ifdef DIAGNOSTIC 599 /* 600 * Check for returns of data that do not point to the 601 * beginning of the allocation. 602 */ 603 if (cursize > PAGE_SIZE) 604 alloc = addrmask[BUCKETINDX(PAGE_SIZE)]; 605 else 606 alloc = addrmask[kup->ku_indx]; 607 if (((u_long)curaddr & alloc) != 0) 608 panic("realloc: unaligned addr %p, size %ld, type %s, mask %ld\n", 609 curaddr, cursize, memname[type], alloc); 610 #endif /* DIAGNOSTIC */ 611 612 if (cursize > MAXALLOCSAVE) 613 cursize = ctob(kup->ku_pagecnt); 614 615 /* 616 * If we already actually have as much as they want, we're done. 617 */ 618 if (newsize <= cursize) 619 return (curaddr); 620 621 /* 622 * Can't satisfy the allocation with the existing block. 623 * Allocate a new one and copy the data. 624 */ 625 newaddr = malloc(newsize, type, flags); 626 if (__predict_false(newaddr == NULL)) { 627 /* 628 * Malloc() failed, because flags included M_NOWAIT. 629 * Return NULL to indicate that failure. The old 630 * pointer is still valid. 631 */ 632 return NULL; 633 } 634 memcpy(newaddr, curaddr, cursize); 635 636 /* 637 * We were successful: free the old allocation and return 638 * the new one. 639 */ 640 free(curaddr, type); 641 return (newaddr); 642 } 643 644 /* 645 * Compute the number of pages that kmem_map will map, that is, 646 * the size of the kernel malloc arena. 647 */ 648 void 649 kmeminit_nkmempages() 650 { 651 int npages; 652 653 if (nkmempages != 0) { 654 /* 655 * It's already been set (by us being here before, or 656 * by patching or kernel config options), bail out now. 657 */ 658 return; 659 } 660 661 /* 662 * We use the following (simple) formula: 663 * 664 * - Starting point is physical memory / 4. 665 * 666 * - Clamp it down to NKMEMPAGES_MAX. 667 * 668 * - Round it up to NKMEMPAGES_MIN. 669 */ 670 npages = physmem / 4; 671 672 if (npages > NKMEMPAGES_MAX) 673 npages = NKMEMPAGES_MAX; 674 675 if (npages < NKMEMPAGES_MIN) 676 npages = NKMEMPAGES_MIN; 677 678 nkmempages = npages; 679 } 680 681 /* 682 * Initialize the kernel memory allocator 683 */ 684 void 685 kmeminit() 686 { 687 #ifdef KMEMSTATS 688 long indx; 689 #endif 690 691 #if ((MAXALLOCSAVE & (MAXALLOCSAVE - 1)) != 0) 692 ERROR!_kmeminit:_MAXALLOCSAVE_not_power_of_2 693 #endif 694 #if (MAXALLOCSAVE > MINALLOCSIZE * 32768) 695 ERROR!_kmeminit:_MAXALLOCSAVE_too_big 696 #endif 697 #if (MAXALLOCSAVE < NBPG) 698 ERROR!_kmeminit:_MAXALLOCSAVE_too_small 699 #endif 700 701 if (sizeof(struct freelist) > (1 << MINBUCKET)) 702 panic("minbucket too small/struct freelist too big"); 703 704 /* 705 * Compute the number of kmem_map pages, if we have not 706 * done so already. 707 */ 708 kmeminit_nkmempages(); 709 710 kmemusage = (struct kmemusage *) uvm_km_zalloc(kernel_map, 711 (vsize_t)(nkmempages * sizeof(struct kmemusage))); 712 kmem_map = uvm_km_suballoc(kernel_map, (vaddr_t *)&kmembase, 713 (vaddr_t *)&kmemlimit, (vsize_t)(nkmempages << PAGE_SHIFT), 714 VM_MAP_INTRSAFE, FALSE, &kmem_map_store); 715 #ifdef KMEMSTATS 716 for (indx = 0; indx < MINBUCKET + 16; indx++) { 717 if (1 << indx >= PAGE_SIZE) 718 bucket[indx].kb_elmpercl = 1; 719 else 720 bucket[indx].kb_elmpercl = PAGE_SIZE / (1 << indx); 721 bucket[indx].kb_highwat = 5 * bucket[indx].kb_elmpercl; 722 } 723 for (indx = 0; indx < M_LAST; indx++) 724 kmemstats[indx].ks_limit = 725 ((u_long)nkmempages << PAGE_SHIFT) * 6U / 10U; 726 #endif 727 #ifdef MALLOC_DEBUG 728 debug_malloc_init(); 729 #endif 730 } 731 732 #ifdef DDB 733 #include <ddb/db_output.h> 734 735 /* 736 * Dump kmem statistics from ddb. 737 * 738 * usage: call dump_kmemstats 739 */ 740 void dump_kmemstats __P((void)); 741 742 void 743 dump_kmemstats() 744 { 745 #ifdef KMEMSTATS 746 const char *name; 747 int i; 748 749 for (i = 0; i < M_LAST; i++) { 750 name = memname[i] ? memname[i] : ""; 751 752 db_printf("%2d %s%.*s %ld\n", i, name, 753 (int)(20 - strlen(name)), " ", 754 kmemstats[i].ks_memuse); 755 } 756 #else 757 db_printf("Kmem stats are not being collected.\n"); 758 #endif /* KMEMSTATS */ 759 } 760 #endif /* DDB */ 761
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