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, int zalloc) 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 if (z->zkva == 0) { 296 LIST_REMOVE(z, zlink); 297 return 0; 298 } 299 300 z->zpagemax = totsize / PAGE_SIZE; 301 if (obj == NULL) { 302 z->zobj = vm_object_allocate(OBJT_DEFAULT, z->zpagemax); 303 } else { 304 z->zobj = obj; 305 _vm_object_allocate(OBJT_DEFAULT, z->zpagemax, obj); 306 vm_object_drop(obj); 307 } 308 z->zallocflag = VM_ALLOC_SYSTEM | VM_ALLOC_INTERRUPT | 309 VM_ALLOC_NORMAL | VM_ALLOC_RETRY; 310 z->zmax += nentries; 311 } else { 312 z->zallocflag = VM_ALLOC_NORMAL | VM_ALLOC_SYSTEM; 313 z->zmax = 0; 314 } 315 316 317 if (z->zsize > PAGE_SIZE) 318 z->zfreemin = 1; 319 else 320 z->zfreemin = PAGE_SIZE / z->zsize; 321 322 z->zpagecount = 0; 323 if (zalloc) 324 z->zalloc = zalloc; 325 else 326 z->zalloc = 1; 327 328 /* 329 * Populate the interrrupt zone at creation time rather than 330 * on first allocation, as this is a potentially long operation. 331 */ 332 if (z->zflags & ZONE_INTERRUPT) { 333 void *buf; 334 335 buf = zget(z); 336 zfree(z, buf); 337 } 338 339 return 1; 340 } 341 342 /* 343 * Subroutine same as zinitna, except zone data structure is allocated 344 * automatically by malloc. This routine should normally be used, except 345 * in certain tricky startup conditions in the VM system -- then 346 * zbootinit and zinitna can be used. Zinit is the standard zone 347 * initialization call. 348 * 349 * No requirements. 350 */ 351 vm_zone_t 352 zinit(char *name, int size, int nentries, int flags, int zalloc) 353 { 354 vm_zone_t z; 355 356 z = (vm_zone_t) kmalloc(sizeof (struct vm_zone), M_ZONE, M_NOWAIT); 357 if (z == NULL) 358 return NULL; 359 360 z->zflags = 0; 361 if (zinitna(z, NULL, name, size, nentries, 362 flags & ~ZONE_DESTROYABLE, zalloc) == 0) { 363 kfree(z, M_ZONE); 364 return NULL; 365 } 366 367 if (flags & ZONE_DESTROYABLE) 368 z->zflags |= ZONE_DESTROYABLE; 369 370 return z; 371 } 372 373 /* 374 * Initialize a zone before the system is fully up. This routine should 375 * only be called before full VM startup. 376 * 377 * Called from the low level boot code only. 378 */ 379 void 380 zbootinit(vm_zone_t z, char *name, int size, void *item, int nitems) 381 { 382 int i; 383 384 bzero(z->zitems_pcpu, sizeof(z->zitems_pcpu)); 385 bzero(z->zfreecnt_pcpu, sizeof(z->zfreecnt_pcpu)); 386 387 z->zname = name; 388 z->zsize = size; 389 z->zpagemax = 0; 390 z->zobj = NULL; 391 z->zflags = ZONE_BOOT; 392 z->zfreemin = 0; 393 z->zallocflag = 0; 394 z->zpagecount = 0; 395 z->zalloc = 0; 396 z->znalloc = 0; 397 spin_init(&z->zlock, "zbootinit"); 398 399 bzero(item, (size_t)nitems * z->zsize); 400 z->zitems = NULL; 401 for (i = 0; i < nitems; i++) { 402 ((void **)item)[0] = z->zitems; 403 #ifdef INVARIANTS 404 ((void **)item)[1] = (void *)ZENTRY_FREE; 405 #endif 406 z->zitems = item; 407 item = (uint8_t *)item + z->zsize; 408 } 409 z->zfreecnt = nitems; 410 z->zmax = nitems; 411 z->ztotal = nitems; 412 413 lwkt_gettoken(&vm_token); 414 LIST_INSERT_HEAD(&zlist, z, zlink); 415 lwkt_reltoken(&vm_token); 416 } 417 418 /* 419 * Release all resources owned by zone created with zinit(). 420 * 421 * No requirements. 422 */ 423 void 424 zdestroy(vm_zone_t z) 425 { 426 vm_page_t m; 427 int i; 428 429 if (z == NULL) 430 panic("zdestroy: null zone"); 431 if ((z->zflags & ZONE_DESTROYABLE) == 0) 432 panic("zdestroy: undestroyable zone"); 433 434 lwkt_gettoken(&vm_token); 435 LIST_REMOVE(z, zlink); 436 lwkt_reltoken(&vm_token); 437 438 /* 439 * Release virtual mappings, physical memory and update sysctl stats. 440 */ 441 if (z->zflags & ZONE_INTERRUPT) { 442 /* 443 * Pages mapped via pmap_kenter() must be removed from the 444 * kernel_pmap() before calling kmem_free() to avoid issues 445 * with kernel_pmap.pm_stats.resident_count. 446 */ 447 pmap_qremove(z->zkva, z->zpagemax); 448 vm_object_hold(z->zobj); 449 for (i = 0; i < z->zpagecount; ++i) { 450 m = vm_page_lookup_busy_wait(z->zobj, i, TRUE, "vmzd"); 451 vm_page_unwire(m, 0); 452 vm_page_free(m); 453 } 454 455 /* 456 * Free the mapping. 457 */ 458 kmem_free(&kernel_map, z->zkva, 459 (size_t)z->zpagemax * PAGE_SIZE); 460 atomic_subtract_long(&zone_kmem_kvaspace, 461 (size_t)z->zpagemax * PAGE_SIZE); 462 463 /* 464 * Free the backing object and physical pages. 465 */ 466 vm_object_deallocate(z->zobj); 467 vm_object_drop(z->zobj); 468 atomic_subtract_int(&zone_kmem_pages, z->zpagecount); 469 } else { 470 for (i=0; i < z->zkmcur; i++) { 471 kmem_free(&kernel_map, z->zkmvec[i], 472 (size_t)z->zalloc * PAGE_SIZE); 473 atomic_subtract_int(&zone_kern_pages, z->zalloc); 474 } 475 if (z->zkmvec != NULL) 476 kfree(z->zkmvec, M_ZONE); 477 } 478 479 spin_uninit(&z->zlock); 480 kfree(z, M_ZONE); 481 } 482 483 484 /* 485 * void *zalloc(vm_zone_t zone) -- 486 * Returns an item from a specified zone. May not be called from a 487 * FAST interrupt or IPI function. 488 * 489 * void zfree(vm_zone_t zone, void *item) -- 490 * Frees an item back to a specified zone. May not be called from a 491 * FAST interrupt or IPI function. 492 */ 493 494 /* 495 * Internal zone routine. Not to be called from external (non vm_zone) code. 496 * 497 * No requirements. 498 */ 499 static void * 500 zget(vm_zone_t z) 501 { 502 int i; 503 vm_page_t m; 504 int nitems; 505 int npages; 506 int savezpc; 507 size_t nbytes; 508 size_t noffset; 509 void *item; 510 511 if (z == NULL) 512 panic("zget: null zone"); 513 514 if (z->zflags & ZONE_INTERRUPT) { 515 /* 516 * Interrupt zones do not mess with the kernel_map, they 517 * simply populate an existing mapping. 518 * 519 * First reserve the required space. 520 */ 521 vm_object_hold(z->zobj); 522 noffset = (size_t)z->zpagecount * PAGE_SIZE; 523 noffset -= noffset % z->zsize; 524 savezpc = z->zpagecount; 525 if (z->zpagecount + z->zalloc > z->zpagemax) 526 z->zpagecount = z->zpagemax; 527 else 528 z->zpagecount += z->zalloc; 529 item = (char *)z->zkva + noffset; 530 npages = z->zpagecount - savezpc; 531 nitems = ((size_t)(savezpc + npages) * PAGE_SIZE - noffset) / 532 z->zsize; 533 atomic_add_int(&zone_kmem_pages, npages); 534 535 /* 536 * Now allocate the pages. Note that we can block in the 537 * loop, so we've already done all the necessary calculations 538 * and reservations above. 539 */ 540 for (i = 0; i < npages; ++i) { 541 vm_offset_t zkva; 542 543 m = vm_page_alloc(z->zobj, savezpc + i, z->zallocflag); 544 KKASSERT(m != NULL); 545 /* note: z might be modified due to blocking */ 546 547 KKASSERT(m->queue == PQ_NONE); 548 m->valid = VM_PAGE_BITS_ALL; 549 vm_page_wire(m); 550 vm_page_wakeup(m); 551 552 zkva = z->zkva + (size_t)(savezpc + i) * PAGE_SIZE; 553 pmap_kenter(zkva, VM_PAGE_TO_PHYS(m)); 554 bzero((void *)zkva, PAGE_SIZE); 555 } 556 vm_object_drop(z->zobj); 557 } else if (z->zflags & ZONE_SPECIAL) { 558 /* 559 * The special zone is the one used for vm_map_entry_t's. 560 * We have to avoid an infinite recursion in 561 * vm_map_entry_reserve() by using vm_map_entry_kreserve() 562 * instead. The map entries are pre-reserved by the kernel 563 * by vm_map_entry_reserve_cpu_init(). 564 */ 565 nbytes = (size_t)z->zalloc * PAGE_SIZE; 566 567 item = (void *)kmem_alloc3(&kernel_map, nbytes, KM_KRESERVE); 568 569 /* note: z might be modified due to blocking */ 570 if (item != NULL) { 571 zone_kern_pages += z->zalloc; /* not MP-safe XXX */ 572 bzero(item, nbytes); 573 } else { 574 nbytes = 0; 575 } 576 nitems = nbytes / z->zsize; 577 } else { 578 /* 579 * Otherwise allocate KVA from the kernel_map. 580 */ 581 nbytes = (size_t)z->zalloc * PAGE_SIZE; 582 583 item = (void *)kmem_alloc3(&kernel_map, nbytes, 0); 584 585 /* note: z might be modified due to blocking */ 586 if (item != NULL) { 587 zone_kern_pages += z->zalloc; /* not MP-safe XXX */ 588 bzero(item, nbytes); 589 590 if (z->zflags & ZONE_DESTROYABLE) { 591 if (z->zkmcur == z->zkmmax) { 592 z->zkmmax = 593 z->zkmmax==0 ? 1 : z->zkmmax*2; 594 z->zkmvec = krealloc(z->zkmvec, 595 z->zkmmax * sizeof(z->zkmvec[0]), 596 M_ZONE, M_WAITOK); 597 } 598 z->zkmvec[z->zkmcur++] = (vm_offset_t)item; 599 } 600 } else { 601 nbytes = 0; 602 } 603 nitems = nbytes / z->zsize; 604 } 605 606 spin_lock(&z->zlock); 607 z->ztotal += nitems; 608 /* 609 * Save one for immediate allocation 610 */ 611 if (nitems != 0) { 612 nitems -= 1; 613 for (i = 0; i < nitems; i++) { 614 ((void **)item)[0] = z->zitems; 615 #ifdef INVARIANTS 616 ((void **)item)[1] = (void *)ZENTRY_FREE; 617 #endif 618 z->zitems = item; 619 item = (uint8_t *)item + z->zsize; 620 } 621 z->zfreecnt += nitems; 622 z->znalloc++; 623 } else if (z->zfreecnt > 0) { 624 item = z->zitems; 625 z->zitems = ((void **)item)[0]; 626 #ifdef INVARIANTS 627 if (((void **)item)[1] != (void *)ZENTRY_FREE) 628 zerror(ZONE_ERROR_NOTFREE); 629 ((void **) item)[1] = NULL; 630 #endif 631 z->zfreecnt--; 632 z->znalloc++; 633 } else { 634 item = NULL; 635 } 636 spin_unlock(&z->zlock); 637 638 /* 639 * A special zone may have used a kernel-reserved vm_map_entry. If 640 * so we have to be sure to recover our reserve so we don't run out. 641 * We will panic if we run out. 642 */ 643 if (z->zflags & ZONE_SPECIAL) 644 vm_map_entry_reserve(0); 645 646 return item; 647 } 648 649 /* 650 * No requirements. 651 */ 652 static int 653 sysctl_vm_zone(SYSCTL_HANDLER_ARGS) 654 { 655 int error=0; 656 vm_zone_t curzone; 657 char tmpbuf[128]; 658 char tmpname[14]; 659 660 ksnprintf(tmpbuf, sizeof(tmpbuf), 661 "\nITEM SIZE LIMIT USED FREE REQUESTS\n"); 662 error = SYSCTL_OUT(req, tmpbuf, strlen(tmpbuf)); 663 if (error) 664 return (error); 665 666 lwkt_gettoken(&vm_token); 667 LIST_FOREACH(curzone, &zlist, zlink) { 668 int i; 669 int n; 670 int len; 671 int offset; 672 int freecnt; 673 674 len = strlen(curzone->zname); 675 if (len >= (sizeof(tmpname) - 1)) 676 len = (sizeof(tmpname) - 1); 677 for(i = 0; i < sizeof(tmpname) - 1; i++) 678 tmpname[i] = ' '; 679 tmpname[i] = 0; 680 memcpy(tmpname, curzone->zname, len); 681 tmpname[len] = ':'; 682 offset = 0; 683 if (curzone == LIST_FIRST(&zlist)) { 684 offset = 1; 685 tmpbuf[0] = '\n'; 686 } 687 freecnt = curzone->zfreecnt; 688 for (n = 0; n < ncpus; ++n) 689 freecnt += curzone->zfreecnt_pcpu[n]; 690 691 ksnprintf(tmpbuf + offset, sizeof(tmpbuf) - offset, 692 "%s %6.6u, %8.8u, %6.6u, %6.6u, %8.8u\n", 693 tmpname, curzone->zsize, curzone->zmax, 694 (curzone->ztotal - freecnt), 695 freecnt, curzone->znalloc); 696 697 len = strlen((char *)tmpbuf); 698 if (LIST_NEXT(curzone, zlink) == NULL) 699 tmpbuf[len - 1] = 0; 700 701 error = SYSCTL_OUT(req, tmpbuf, len); 702 703 if (error) 704 break; 705 } 706 lwkt_reltoken(&vm_token); 707 return (error); 708 } 709 710 #if defined(INVARIANTS) 711 712 /* 713 * Debugging only. 714 */ 715 void 716 zerror(int error) 717 { 718 char *msg; 719 720 switch (error) { 721 case ZONE_ERROR_INVALID: 722 msg = "zone: invalid zone"; 723 break; 724 case ZONE_ERROR_NOTFREE: 725 msg = "zone: entry not free"; 726 break; 727 case ZONE_ERROR_ALREADYFREE: 728 msg = "zone: freeing free entry"; 729 break; 730 default: 731 msg = "zone: invalid error"; 732 break; 733 } 734 panic("%s", msg); 735 } 736 #endif 737 738 SYSCTL_OID(_vm, OID_AUTO, zone, CTLTYPE_STRING|CTLFLAG_RD, \ 739 NULL, 0, sysctl_vm_zone, "A", "Zone Info"); 740 741 SYSCTL_INT(_vm, OID_AUTO, zone_kmem_pages, 742 CTLFLAG_RD, &zone_kmem_pages, 0, "Number of interrupt safe pages allocated by zone"); 743 SYSCTL_INT(_vm, OID_AUTO, zone_burst, 744 CTLFLAG_RW, &zone_burst, 0, "Burst from depot to pcpu cache"); 745 SYSCTL_LONG(_vm, OID_AUTO, zone_kmem_kvaspace, 746 CTLFLAG_RD, &zone_kmem_kvaspace, 0, "KVA space allocated by zone"); 747 SYSCTL_INT(_vm, OID_AUTO, zone_kern_pages, 748 CTLFLAG_RD, &zone_kern_pages, 0, "Number of non-interrupt safe pages allocated by zone"); 749