1 /* 2 * (MPSAFE) 3 * 4 * Copyright (c) 1997, 1998 John S. Dyson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice immediately at the beginning of the file, without modification, 12 * this list of conditions, and the following disclaimer. 13 * 2. Absolutely no warranty of function or purpose is made by the author 14 * John S. Dyson. 15 * 16 * $FreeBSD: src/sys/vm/vm_zone.c,v 1.30.2.6 2002/10/10 19:50:16 dillon Exp $ 17 */ 18 19 #include <sys/param.h> 20 #include <sys/queue.h> 21 #include <sys/systm.h> 22 #include <sys/kernel.h> 23 #include <sys/lock.h> 24 #include <sys/malloc.h> 25 #include <sys/sysctl.h> 26 #include <sys/vmmeter.h> 27 28 #include <vm/vm.h> 29 #include <vm/vm_object.h> 30 #include <vm/vm_page.h> 31 #include <vm/vm_map.h> 32 #include <vm/vm_kern.h> 33 #include <vm/vm_extern.h> 34 #include <vm/vm_zone.h> 35 36 #include <sys/spinlock2.h> 37 #include <vm/vm_page2.h> 38 39 static MALLOC_DEFINE(M_ZONE, "ZONE", "Zone header"); 40 41 #define ZONE_ERROR_INVALID 0 42 #define ZONE_ERROR_NOTFREE 1 43 #define ZONE_ERROR_ALREADYFREE 2 44 45 #define ZONE_ROUNDING 32 46 47 #define ZENTRY_FREE 0x12342378 48 49 int zone_burst = 32; 50 51 static void *zget(vm_zone_t z); 52 53 /* 54 * Return an item from the specified zone. This function is non-blocking for 55 * ZONE_INTERRUPT zones. 56 * 57 * No requirements. 58 */ 59 void * 60 zalloc(vm_zone_t z) 61 { 62 globaldata_t gd = mycpu; 63 void *item; 64 int n; 65 66 #ifdef INVARIANTS 67 if (z == NULL) 68 zerror(ZONE_ERROR_INVALID); 69 #endif 70 retry: 71 /* 72 * Avoid spinlock contention by allocating from a per-cpu queue 73 */ 74 if (z->zfreecnt_pcpu[gd->gd_cpuid] > 0) { 75 crit_enter_gd(gd); 76 if (z->zfreecnt_pcpu[gd->gd_cpuid] > 0) { 77 item = z->zitems_pcpu[gd->gd_cpuid]; 78 #ifdef INVARIANTS 79 KASSERT(item != NULL, 80 ("zitems_pcpu unexpectedly NULL")); 81 if (((void **)item)[1] != (void *)ZENTRY_FREE) 82 zerror(ZONE_ERROR_NOTFREE); 83 ((void **)item)[1] = NULL; 84 #endif 85 z->zitems_pcpu[gd->gd_cpuid] = ((void **) item)[0]; 86 --z->zfreecnt_pcpu[gd->gd_cpuid]; 87 z->znalloc++; 88 crit_exit_gd(gd); 89 return item; 90 } 91 crit_exit_gd(gd); 92 } 93 94 /* 95 * Per-zone spinlock for the remainder. Always load at least one 96 * item. 97 */ 98 spin_lock(&z->zlock); 99 if (z->zfreecnt > z->zfreemin) { 100 n = zone_burst; 101 do { 102 item = z->zitems; 103 #ifdef INVARIANTS 104 KASSERT(item != NULL, ("zitems unexpectedly NULL")); 105 if (((void **)item)[1] != (void *)ZENTRY_FREE) 106 zerror(ZONE_ERROR_NOTFREE); 107 #endif 108 z->zitems = ((void **)item)[0]; 109 z->zfreecnt--; 110 ((void **)item)[0] = z->zitems_pcpu[gd->gd_cpuid]; 111 z->zitems_pcpu[gd->gd_cpuid] = item; 112 ++z->zfreecnt_pcpu[gd->gd_cpuid]; 113 } while (--n > 0 && z->zfreecnt > z->zfreemin); 114 spin_unlock(&z->zlock); 115 goto retry; 116 } else { 117 spin_unlock(&z->zlock); 118 item = zget(z); 119 /* 120 * PANICFAIL allows the caller to assume that the zalloc() 121 * will always succeed. If it doesn't, we panic here. 122 */ 123 if (item == NULL && (z->zflags & ZONE_PANICFAIL)) 124 panic("zalloc(%s) failed", z->zname); 125 } 126 return item; 127 } 128 129 /* 130 * Free an item to the specified zone. 131 * 132 * No requirements. 133 */ 134 void 135 zfree(vm_zone_t z, void *item) 136 { 137 globaldata_t gd = mycpu; 138 void *tail_item; 139 int count; 140 int zmax; 141 142 /* 143 * Avoid spinlock contention by freeing into a per-cpu queue 144 */ 145 if ((zmax = z->zmax) != 0) 146 zmax = zmax / ncpus / 16; 147 if (zmax < 64) 148 zmax = 64; 149 150 /* 151 * Add to pcpu cache 152 */ 153 crit_enter_gd(gd); 154 ((void **)item)[0] = z->zitems_pcpu[gd->gd_cpuid]; 155 #ifdef INVARIANTS 156 if (((void **)item)[1] == (void *)ZENTRY_FREE) 157 zerror(ZONE_ERROR_ALREADYFREE); 158 ((void **)item)[1] = (void *)ZENTRY_FREE; 159 #endif 160 z->zitems_pcpu[gd->gd_cpuid] = item; 161 ++z->zfreecnt_pcpu[gd->gd_cpuid]; 162 163 if (z->zfreecnt_pcpu[gd->gd_cpuid] < zmax) { 164 crit_exit_gd(gd); 165 return; 166 } 167 168 /* 169 * Hystereis, move (zmax) (calculated below) items to the pool. 170 */ 171 zmax = zmax / 2; 172 if (zmax > zone_burst) 173 zmax = zone_burst; 174 tail_item = item; 175 count = 1; 176 177 while (count < zmax) { 178 tail_item = ((void **)tail_item)[0]; 179 ++count; 180 } 181 182 z->zitems_pcpu[gd->gd_cpuid] = ((void **)tail_item)[0]; 183 z->zfreecnt_pcpu[gd->gd_cpuid] -= count; 184 185 /* 186 * Per-zone spinlock for the remainder. 187 * 188 * Also implement hysteresis by freeing a number of pcpu 189 * entries. 190 */ 191 spin_lock(&z->zlock); 192 ((void **)tail_item)[0] = z->zitems; 193 z->zitems = item; 194 z->zfreecnt += count; 195 196 spin_unlock(&z->zlock); 197 crit_exit_gd(gd); 198 } 199 200 /* 201 * This file comprises a very simple zone allocator. This is used 202 * in lieu of the malloc allocator, where needed or more optimal. 203 * 204 * Note that the initial implementation of this had coloring, and 205 * absolutely no improvement (actually perf degradation) occurred. 206 * 207 * Note also that the zones are type stable. The only restriction is 208 * that the first two longwords of a data structure can be changed 209 * between allocations. Any data that must be stable between allocations 210 * must reside in areas after the first two longwords. 211 * 212 * zinitna, zinit, zbootinit are the initialization routines. 213 * zalloc, zfree, are the allocation/free routines. 214 */ 215 216 LIST_HEAD(zlist, vm_zone) zlist = LIST_HEAD_INITIALIZER(zlist); 217 static int sysctl_vm_zone(SYSCTL_HANDLER_ARGS); 218 static int zone_kmem_pages, zone_kern_pages; 219 static long zone_kmem_kvaspace; 220 221 /* 222 * Create a zone, but don't allocate the zone structure. If the 223 * zone had been previously created by the zone boot code, initialize 224 * various parts of the zone code. 225 * 226 * If waits are not allowed during allocation (e.g. during interrupt 227 * code), a-priori allocate the kernel virtual space, and allocate 228 * only pages when needed. 229 * 230 * Arguments: 231 * z pointer to zone structure. 232 * obj pointer to VM object (opt). 233 * name name of zone. 234 * size size of zone entries. 235 * nentries number of zone entries allocated (only ZONE_INTERRUPT.) 236 * flags ZONE_INTERRUPT -- items can be allocated at interrupt time. 237 * zalloc number of pages allocated when memory is needed. 238 * 239 * Note that when using ZONE_INTERRUPT, the size of the zone is limited 240 * by the nentries argument. The size of the memory allocatable is 241 * unlimited if ZONE_INTERRUPT is not set. 242 * 243 * No requirements. 244 */ 245 int 246 zinitna(vm_zone_t z, vm_object_t obj, char *name, int size, 247 int nentries, int flags) 248 { 249 size_t totsize; 250 251 /* 252 * Only zones created with zinit() are destroyable. 253 */ 254 if (z->zflags & ZONE_DESTROYABLE) 255 panic("zinitna: can't create destroyable zone"); 256 257 /* 258 * NOTE: We can only adjust zsize if we previously did not 259 * use zbootinit(). 260 */ 261 if ((z->zflags & ZONE_BOOT) == 0) { 262 z->zsize = roundup2(size, ZONE_ROUNDING); 263 spin_init(&z->zlock, "zinitna"); 264 z->zfreecnt = 0; 265 z->ztotal = 0; 266 z->zmax = 0; 267 z->zname = name; 268 z->znalloc = 0; 269 z->zitems = NULL; 270 271 lwkt_gettoken(&vm_token); 272 LIST_INSERT_HEAD(&zlist, z, zlink); 273 lwkt_reltoken(&vm_token); 274 275 bzero(z->zitems_pcpu, sizeof(z->zitems_pcpu)); 276 bzero(z->zfreecnt_pcpu, sizeof(z->zfreecnt_pcpu)); 277 } 278 279 z->zkmvec = NULL; 280 z->zkmcur = z->zkmmax = 0; 281 z->zflags |= flags; 282 283 /* 284 * If we cannot wait, allocate KVA space up front, and we will fill 285 * in pages as needed. This is particularly required when creating 286 * an allocation space for map entries in kernel_map, because we 287 * do not want to go into a recursion deadlock with 288 * vm_map_entry_reserve(). 289 */ 290 if (z->zflags & ZONE_INTERRUPT) { 291 totsize = round_page((size_t)z->zsize * nentries); 292 atomic_add_long(&zone_kmem_kvaspace, totsize); 293 294 z->zkva = kmem_alloc_pageable(&kernel_map, totsize, 295 VM_SUBSYS_ZALLOC); 296 if (z->zkva == 0) { 297 LIST_REMOVE(z, zlink); 298 return 0; 299 } 300 301 z->zpagemax = totsize / PAGE_SIZE; 302 if (obj == NULL) { 303 z->zobj = vm_object_allocate(OBJT_DEFAULT, z->zpagemax); 304 } else { 305 z->zobj = obj; 306 _vm_object_allocate(OBJT_DEFAULT, z->zpagemax, obj); 307 vm_object_drop(obj); 308 } 309 z->zallocflag = VM_ALLOC_SYSTEM | VM_ALLOC_INTERRUPT | 310 VM_ALLOC_NORMAL | VM_ALLOC_RETRY; 311 z->zmax += nentries; 312 } else { 313 z->zallocflag = VM_ALLOC_NORMAL | VM_ALLOC_SYSTEM; 314 z->zmax = 0; 315 } 316 317 318 if (z->zsize > PAGE_SIZE) 319 z->zfreemin = 1; 320 else 321 z->zfreemin = PAGE_SIZE / z->zsize; 322 323 z->zpagecount = 0; 324 325 /* 326 * Reduce kernel_map spam by allocating in chunks of 4 pages. 327 */ 328 z->zalloc = 4; 329 330 /* 331 * Populate the interrrupt zone at creation time rather than 332 * on first allocation, as this is a potentially long operation. 333 */ 334 if (z->zflags & ZONE_INTERRUPT) { 335 void *buf; 336 337 buf = zget(z); 338 zfree(z, buf); 339 } 340 341 return 1; 342 } 343 344 /* 345 * Subroutine same as zinitna, except zone data structure is allocated 346 * automatically by malloc. This routine should normally be used, except 347 * in certain tricky startup conditions in the VM system -- then 348 * zbootinit and zinitna can be used. Zinit is the standard zone 349 * initialization call. 350 * 351 * No requirements. 352 */ 353 vm_zone_t 354 zinit(char *name, int size, int nentries, int flags) 355 { 356 vm_zone_t z; 357 358 z = (vm_zone_t) kmalloc(sizeof (struct vm_zone), M_ZONE, M_NOWAIT); 359 if (z == NULL) 360 return NULL; 361 362 z->zflags = 0; 363 if (zinitna(z, NULL, name, size, nentries, 364 flags & ~ZONE_DESTROYABLE) == 0) { 365 kfree(z, M_ZONE); 366 return NULL; 367 } 368 369 if (flags & ZONE_DESTROYABLE) 370 z->zflags |= ZONE_DESTROYABLE; 371 372 return z; 373 } 374 375 /* 376 * Initialize a zone before the system is fully up. This routine should 377 * only be called before full VM startup. 378 * 379 * Called from the low level boot code only. 380 */ 381 void 382 zbootinit(vm_zone_t z, char *name, int size, void *item, int nitems) 383 { 384 int i; 385 386 bzero(z->zitems_pcpu, sizeof(z->zitems_pcpu)); 387 bzero(z->zfreecnt_pcpu, sizeof(z->zfreecnt_pcpu)); 388 389 z->zname = name; 390 z->zsize = size; 391 z->zpagemax = 0; 392 z->zobj = NULL; 393 z->zflags = ZONE_BOOT; 394 z->zfreemin = 0; 395 z->zallocflag = 0; 396 z->zpagecount = 0; 397 z->zalloc = 0; 398 z->znalloc = 0; 399 spin_init(&z->zlock, "zbootinit"); 400 401 bzero(item, (size_t)nitems * z->zsize); 402 z->zitems = NULL; 403 for (i = 0; i < nitems; i++) { 404 ((void **)item)[0] = z->zitems; 405 #ifdef INVARIANTS 406 ((void **)item)[1] = (void *)ZENTRY_FREE; 407 #endif 408 z->zitems = item; 409 item = (uint8_t *)item + z->zsize; 410 } 411 z->zfreecnt = nitems; 412 z->zmax = nitems; 413 z->ztotal = nitems; 414 415 lwkt_gettoken(&vm_token); 416 LIST_INSERT_HEAD(&zlist, z, zlink); 417 lwkt_reltoken(&vm_token); 418 } 419 420 /* 421 * Release all resources owned by zone created with zinit(). 422 * 423 * No requirements. 424 */ 425 void 426 zdestroy(vm_zone_t z) 427 { 428 vm_page_t m; 429 int i; 430 431 if (z == NULL) 432 panic("zdestroy: null zone"); 433 if ((z->zflags & ZONE_DESTROYABLE) == 0) 434 panic("zdestroy: undestroyable zone"); 435 436 lwkt_gettoken(&vm_token); 437 LIST_REMOVE(z, zlink); 438 lwkt_reltoken(&vm_token); 439 440 /* 441 * Release virtual mappings, physical memory and update sysctl stats. 442 */ 443 if (z->zflags & ZONE_INTERRUPT) { 444 /* 445 * Pages mapped via pmap_kenter() must be removed from the 446 * kernel_pmap() before calling kmem_free() to avoid issues 447 * with kernel_pmap.pm_stats.resident_count. 448 */ 449 pmap_qremove(z->zkva, z->zpagemax); 450 vm_object_hold(z->zobj); 451 for (i = 0; i < z->zpagecount; ++i) { 452 m = vm_page_lookup_busy_wait(z->zobj, i, TRUE, "vmzd"); 453 vm_page_unwire(m, 0); 454 vm_page_free(m); 455 } 456 457 /* 458 * Free the mapping. 459 */ 460 kmem_free(&kernel_map, z->zkva, 461 (size_t)z->zpagemax * PAGE_SIZE); 462 atomic_subtract_long(&zone_kmem_kvaspace, 463 (size_t)z->zpagemax * PAGE_SIZE); 464 465 /* 466 * Free the backing object and physical pages. 467 */ 468 vm_object_deallocate(z->zobj); 469 vm_object_drop(z->zobj); 470 atomic_subtract_int(&zone_kmem_pages, z->zpagecount); 471 } else { 472 for (i = 0; i < z->zkmcur; i++) { 473 kmem_free(&kernel_map, z->zkmvec[i], 474 (size_t)z->zalloc * PAGE_SIZE); 475 atomic_subtract_int(&zone_kern_pages, z->zalloc); 476 } 477 if (z->zkmvec != NULL) 478 kfree(z->zkmvec, M_ZONE); 479 } 480 481 spin_uninit(&z->zlock); 482 kfree(z, M_ZONE); 483 } 484 485 486 /* 487 * void *zalloc(vm_zone_t zone) -- 488 * Returns an item from a specified zone. May not be called from a 489 * FAST interrupt or IPI function. 490 * 491 * void zfree(vm_zone_t zone, void *item) -- 492 * Frees an item back to a specified zone. May not be called from a 493 * FAST interrupt or IPI function. 494 */ 495 496 /* 497 * Internal zone routine. Not to be called from external (non vm_zone) code. 498 * 499 * No requirements. 500 */ 501 static void * 502 zget(vm_zone_t z) 503 { 504 int i; 505 vm_page_t m; 506 int nitems; 507 int npages; 508 int savezpc; 509 size_t nbytes; 510 size_t noffset; 511 void *item; 512 513 if (z == NULL) 514 panic("zget: null zone"); 515 516 if (z->zflags & ZONE_INTERRUPT) { 517 /* 518 * Interrupt zones do not mess with the kernel_map, they 519 * simply populate an existing mapping. 520 * 521 * First reserve the required space. 522 */ 523 vm_object_hold(z->zobj); 524 noffset = (size_t)z->zpagecount * PAGE_SIZE; 525 noffset -= noffset % z->zsize; 526 savezpc = z->zpagecount; 527 if (z->zpagecount + z->zalloc > z->zpagemax) 528 z->zpagecount = z->zpagemax; 529 else 530 z->zpagecount += z->zalloc; 531 item = (char *)z->zkva + noffset; 532 npages = z->zpagecount - savezpc; 533 nitems = ((size_t)(savezpc + npages) * PAGE_SIZE - noffset) / 534 z->zsize; 535 atomic_add_int(&zone_kmem_pages, npages); 536 537 /* 538 * Now allocate the pages. Note that we can block in the 539 * loop, so we've already done all the necessary calculations 540 * and reservations above. 541 */ 542 for (i = 0; i < npages; ++i) { 543 vm_offset_t zkva; 544 545 m = vm_page_alloc(z->zobj, savezpc + i, z->zallocflag); 546 KKASSERT(m != NULL); 547 /* note: z might be modified due to blocking */ 548 549 KKASSERT(m->queue == PQ_NONE); 550 m->valid = VM_PAGE_BITS_ALL; 551 vm_page_wire(m); 552 vm_page_wakeup(m); 553 554 zkva = z->zkva + (size_t)(savezpc + i) * PAGE_SIZE; 555 pmap_kenter(zkva, VM_PAGE_TO_PHYS(m)); 556 bzero((void *)zkva, PAGE_SIZE); 557 } 558 vm_object_drop(z->zobj); 559 } else if (z->zflags & ZONE_SPECIAL) { 560 /* 561 * The special zone is the one used for vm_map_entry_t's. 562 * We have to avoid an infinite recursion in 563 * vm_map_entry_reserve() by using vm_map_entry_kreserve() 564 * instead. The map entries are pre-reserved by the kernel 565 * by vm_map_entry_reserve_cpu_init(). 566 */ 567 nbytes = (size_t)z->zalloc * PAGE_SIZE; 568 569 item = (void *)kmem_alloc3(&kernel_map, nbytes, 570 VM_SUBSYS_ZALLOC, KM_KRESERVE); 571 572 /* note: z might be modified due to blocking */ 573 if (item != NULL) { 574 atomic_add_int(&zone_kern_pages, z->zalloc); 575 bzero(item, nbytes); 576 } else { 577 nbytes = 0; 578 } 579 nitems = nbytes / z->zsize; 580 } else { 581 /* 582 * Otherwise allocate KVA from the kernel_map. 583 */ 584 nbytes = (size_t)z->zalloc * PAGE_SIZE; 585 586 item = (void *)kmem_alloc3(&kernel_map, nbytes, 587 VM_SUBSYS_ZALLOC, 0); 588 589 /* note: z might be modified due to blocking */ 590 if (item != NULL) { 591 atomic_add_int(&zone_kern_pages, z->zalloc); 592 bzero(item, nbytes); 593 594 if (z->zflags & ZONE_DESTROYABLE) { 595 if (z->zkmcur == z->zkmmax) { 596 z->zkmmax = 597 z->zkmmax==0 ? 1 : z->zkmmax*2; 598 z->zkmvec = krealloc(z->zkmvec, 599 z->zkmmax * sizeof(z->zkmvec[0]), 600 M_ZONE, M_WAITOK); 601 } 602 z->zkmvec[z->zkmcur++] = (vm_offset_t)item; 603 } 604 } else { 605 nbytes = 0; 606 } 607 nitems = nbytes / z->zsize; 608 } 609 610 spin_lock(&z->zlock); 611 z->ztotal += nitems; 612 /* 613 * Save one for immediate allocation 614 */ 615 if (nitems != 0) { 616 nitems -= 1; 617 for (i = 0; i < nitems; i++) { 618 ((void **)item)[0] = z->zitems; 619 #ifdef INVARIANTS 620 ((void **)item)[1] = (void *)ZENTRY_FREE; 621 #endif 622 z->zitems = item; 623 item = (uint8_t *)item + z->zsize; 624 } 625 z->zfreecnt += nitems; 626 z->znalloc++; 627 } else if (z->zfreecnt > 0) { 628 item = z->zitems; 629 z->zitems = ((void **)item)[0]; 630 #ifdef INVARIANTS 631 if (((void **)item)[1] != (void *)ZENTRY_FREE) 632 zerror(ZONE_ERROR_NOTFREE); 633 ((void **) item)[1] = NULL; 634 #endif 635 z->zfreecnt--; 636 z->znalloc++; 637 } else { 638 item = NULL; 639 } 640 spin_unlock(&z->zlock); 641 642 /* 643 * A special zone may have used a kernel-reserved vm_map_entry. If 644 * so we have to be sure to recover our reserve so we don't run out. 645 * We will panic if we run out. 646 */ 647 if (z->zflags & ZONE_SPECIAL) 648 vm_map_entry_reserve(0); 649 650 return item; 651 } 652 653 /* 654 * No requirements. 655 */ 656 static int 657 sysctl_vm_zone(SYSCTL_HANDLER_ARGS) 658 { 659 int error=0; 660 vm_zone_t curzone; 661 char tmpbuf[128]; 662 char tmpname[14]; 663 664 ksnprintf(tmpbuf, sizeof(tmpbuf), 665 "\nITEM SIZE LIMIT USED FREE REQUESTS\n"); 666 error = SYSCTL_OUT(req, tmpbuf, strlen(tmpbuf)); 667 if (error) 668 return (error); 669 670 lwkt_gettoken(&vm_token); 671 LIST_FOREACH(curzone, &zlist, zlink) { 672 int i; 673 int n; 674 int len; 675 int offset; 676 int freecnt; 677 678 len = strlen(curzone->zname); 679 if (len >= (sizeof(tmpname) - 1)) 680 len = (sizeof(tmpname) - 1); 681 for(i = 0; i < sizeof(tmpname) - 1; i++) 682 tmpname[i] = ' '; 683 tmpname[i] = 0; 684 memcpy(tmpname, curzone->zname, len); 685 tmpname[len] = ':'; 686 offset = 0; 687 if (curzone == LIST_FIRST(&zlist)) { 688 offset = 1; 689 tmpbuf[0] = '\n'; 690 } 691 freecnt = curzone->zfreecnt; 692 for (n = 0; n < ncpus; ++n) 693 freecnt += curzone->zfreecnt_pcpu[n]; 694 695 ksnprintf(tmpbuf + offset, sizeof(tmpbuf) - offset, 696 "%s %6.6u, %8.8u, %6.6u, %6.6u, %8.8u\n", 697 tmpname, curzone->zsize, curzone->zmax, 698 (curzone->ztotal - freecnt), 699 freecnt, curzone->znalloc); 700 701 len = strlen((char *)tmpbuf); 702 if (LIST_NEXT(curzone, zlink) == NULL) 703 tmpbuf[len - 1] = 0; 704 705 error = SYSCTL_OUT(req, tmpbuf, len); 706 707 if (error) 708 break; 709 } 710 lwkt_reltoken(&vm_token); 711 return (error); 712 } 713 714 #if defined(INVARIANTS) 715 716 /* 717 * Debugging only. 718 */ 719 void 720 zerror(int error) 721 { 722 char *msg; 723 724 switch (error) { 725 case ZONE_ERROR_INVALID: 726 msg = "zone: invalid zone"; 727 break; 728 case ZONE_ERROR_NOTFREE: 729 msg = "zone: entry not free"; 730 break; 731 case ZONE_ERROR_ALREADYFREE: 732 msg = "zone: freeing free entry"; 733 break; 734 default: 735 msg = "zone: invalid error"; 736 break; 737 } 738 panic("%s", msg); 739 } 740 #endif 741 742 SYSCTL_OID(_vm, OID_AUTO, zone, CTLTYPE_STRING|CTLFLAG_RD, \ 743 NULL, 0, sysctl_vm_zone, "A", "Zone Info"); 744 745 SYSCTL_INT(_vm, OID_AUTO, zone_kmem_pages, 746 CTLFLAG_RD, &zone_kmem_pages, 0, "Number of interrupt safe pages allocated by zone"); 747 SYSCTL_INT(_vm, OID_AUTO, zone_burst, 748 CTLFLAG_RW, &zone_burst, 0, "Burst from depot to pcpu cache"); 749 SYSCTL_LONG(_vm, OID_AUTO, zone_kmem_kvaspace, 750 CTLFLAG_RD, &zone_kmem_kvaspace, 0, "KVA space allocated by zone"); 751 SYSCTL_INT(_vm, OID_AUTO, zone_kern_pages, 752 CTLFLAG_RD, &zone_kern_pages, 0, "Number of non-interrupt safe pages allocated by zone"); 753