sys/kern/kern_malloc.c

   1 /*-
   2  * Copyright (c) 1987, 1991, 1993
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2005-2006 Robert N. M. Watson
   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, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)kern_malloc.c       8.3 (Berkeley) 1/4/94
  32  */
  33
  34 /*
  35  * Kernel malloc(9) implementation -- general purpose kernel memory allocator
  36  * based on memory types.  Back end is implemented using the UMA(9) zone
  37  * allocator.  A set of fixed-size buckets are used for smaller allocations,
  38  * and a special UMA allocation interface is used for larger allocations.
  39  * Callers declare memory types, and statistics are maintained independently
  40  * for each memory type.  Statistics are maintained per-CPU for performance
  41  * reasons.  See malloc(9) and comments in malloc.h for a detailed
  42  * description.
  43  */
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include "opt_ddb.h"
  49 #include "opt_kdtrace.h"
  50 #include "opt_vm.h"
  51
  52 #include <sys/param.h>
  53 #include <sys/systm.h>
  54 #include <sys/kdb.h>
  55 #include <sys/kernel.h>
  56 #include <sys/lock.h>
  57 #include <sys/malloc.h>
  58 #include <sys/mbuf.h>
  59 #include <sys/mutex.h>
  60 #include <sys/vmmeter.h>
  61 #include <sys/proc.h>
  62 #include <sys/sbuf.h>
  63 #include <sys/sysctl.h>
  64 #include <sys/time.h>
  65
  66 #include <vm/vm.h>
  67 #include <vm/pmap.h>
  68 #include <vm/vm_param.h>
  69 #include <vm/vm_kern.h>
  70 #include <vm/vm_extern.h>
  71 #include <vm/vm_map.h>
  72 #include <vm/vm_page.h>
  73 #include <vm/uma.h>
  74 #include <vm/uma_int.h>
  75 #include <vm/uma_dbg.h>
  76
  77 #ifdef DEBUG_MEMGUARD
  78 #include <vm/memguard.h>
  79 #endif
  80 #ifdef DEBUG_REDZONE
  81 #include <vm/redzone.h>
  82 #endif
  83
  84 #if defined(INVARIANTS) && defined(__i386__)
  85 #include <machine/cpu.h>
  86 #endif
  87
  88 #include <ddb/ddb.h>
  89
  90 #ifdef KDTRACE_HOOKS
  91 #include <sys/dtrace_bsd.h>
  92
  93 dtrace_malloc_probe_func_t      dtrace_malloc_probe;
  94 #endif
  95
  96 /*
  97  * When realloc() is called, if the new size is sufficiently smaller than
  98  * the old size, realloc() will allocate a new, smaller block to avoid
  99  * wasting memory. 'Sufficiently smaller' is defined as: newsize <=
 100  * oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
 101  */
 102 #ifndef REALLOC_FRACTION
 103 #define REALLOC_FRACTION        1       /* new block if <= half the size */
 104 #endif
 105
 106 /*
 107  * Centrally define some common malloc types.
 108  */
 109 MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
 110 MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
 111 MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
 112
 113 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
 114 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
 115
 116 static void kmeminit(void *);
 117 SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL);
 118
 119 static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
 120
 121 static struct malloc_type *kmemstatistics;
 122 static vm_offset_t kmembase;
 123 static vm_offset_t kmemlimit;
 124 static int kmemcount;
 125
 126 #define KMEM_ZSHIFT     4
 127 #define KMEM_ZBASE      16
 128 #define KMEM_ZMASK      (KMEM_ZBASE - 1)
 129
 130 #define KMEM_ZMAX       PAGE_SIZE
 131 #define KMEM_ZSIZE      (KMEM_ZMAX >> KMEM_ZSHIFT)
 132 static u_int8_t kmemsize[KMEM_ZSIZE + 1];
 133
 134 /*
 135  * Small malloc(9) memory allocations are allocated from a set of UMA buckets
 136  * of various sizes.
 137  *
 138  * XXX: The comment here used to read "These won't be powers of two for
 139  * long."  It's possible that a significant amount of wasted memory could be
 140  * recovered by tuning the sizes of these buckets.
 141  */
 142 struct {
 143         int kz_size;
 144         char *kz_name;
 145         uma_zone_t kz_zone;
 146 } kmemzones[] = {
 147         {16, "16", NULL},
 148         {32, "32", NULL},
 149         {64, "64", NULL},
 150         {128, "128", NULL},
 151         {256, "256", NULL},
 152         {512, "512", NULL},
 153         {1024, "1024", NULL},
 154         {2048, "2048", NULL},
 155         {4096, "4096", NULL},
 156 #if PAGE_SIZE > 4096
 157         {8192, "8192", NULL},
 158 #if PAGE_SIZE > 8192
 159         {16384, "16384", NULL},
 160 #if PAGE_SIZE > 16384
 161         {32768, "32768", NULL},
 162 #if PAGE_SIZE > 32768
 163         {65536, "65536", NULL},
 164 #if PAGE_SIZE > 65536
 165 #error  "Unsupported PAGE_SIZE"
 166 #endif  /* 65536 */
 167 #endif  /* 32768 */
 168 #endif  /* 16384 */
 169 #endif  /* 8192 */
 170 #endif  /* 4096 */
 171         {0, NULL},
 172 };
 173
 174 /*
 175  * Zone to allocate malloc type descriptions from.  For ABI reasons, memory
 176  * types are described by a data structure passed by the declaring code, but
 177  * the malloc(9) implementation has its own data structure describing the
 178  * type and statistics.  This permits the malloc(9)-internal data structures
 179  * to be modified without breaking binary-compiled kernel modules that
 180  * declare malloc types.
 181  */
 182 static uma_zone_t mt_zone;
 183
 184 u_long vm_kmem_size;
 185 SYSCTL_ULONG(_vm, OID_AUTO, kmem_size, CTLFLAG_RD, &vm_kmem_size, 0,
 186     "Size of kernel memory");
 187
 188 static u_long vm_kmem_size_min;
 189 SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RD, &vm_kmem_size_min, 0,
 190     "Minimum size of kernel memory");
 191
 192 static u_long vm_kmem_size_max;
 193 SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RD, &vm_kmem_size_max, 0,
 194     "Maximum size of kernel memory");
 195
 196 static u_int vm_kmem_size_scale;
 197 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RD, &vm_kmem_size_scale, 0,
 198     "Scale factor for kernel memory size");
 199
 200 /*
 201  * The malloc_mtx protects the kmemstatistics linked list.
 202  */
 203 struct mtx malloc_mtx;
 204
 205 #ifdef MALLOC_PROFILE
 206 uint64_t krequests[KMEM_ZSIZE + 1];
 207
 208 static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
 209 #endif
 210
 211 static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
 212
 213 /*
 214  * time_uptime of the last malloc(9) failure (induced or real).
 215  */
 216 static time_t t_malloc_fail;
 217
 218 /*
 219  * malloc(9) fault injection -- cause malloc failures every (n) mallocs when
 220  * the caller specifies M_NOWAIT.  If set to 0, no failures are caused.
 221  */
 222 #ifdef MALLOC_MAKE_FAILURES
 223 SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
 224     "Kernel malloc debugging options");
 225
 226 static int malloc_failure_rate;
 227 static int malloc_nowait_count;
 228 static int malloc_failure_count;
 229 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
 230     &malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
 231 TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
 232 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
 233     &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
 234 #endif
 235
 236 int
 237 malloc_last_fail(void)
 238 {
 239
 240         return (time_uptime - t_malloc_fail);
 241 }
 242
 243 /*
 244  * An allocation has succeeded -- update malloc type statistics for the
 245  * amount of bucket size.  Occurs within a critical section so that the
 246  * thread isn't preempted and doesn't migrate while updating per-PCU
 247  * statistics.
 248  */
 249 static void
 250 malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
 251     int zindx)
 252 {
 253         struct malloc_type_internal *mtip;
 254         struct malloc_type_stats *mtsp;
 255
 256         critical_enter();
 257         mtip = mtp->ks_handle;
 258         mtsp = &mtip->mti_stats[curcpu];
 259         if (size > 0) {
 260                 mtsp->mts_memalloced += size;
 261                 mtsp->mts_numallocs++;
 262         }
 263         if (zindx != -1)
 264                 mtsp->mts_size |= 1 << zindx;
 265
 266 #ifdef KDTRACE_HOOKS
 267         if (dtrace_malloc_probe != NULL) {
 268                 uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_MALLOC];
 269                 if (probe_id != 0)
 270                         (dtrace_malloc_probe)(probe_id,
 271                             (uintptr_t) mtp, (uintptr_t) mtip,
 272                             (uintptr_t) mtsp, size, zindx);
 273         }
 274 #endif
 275
 276         critical_exit();
 277 }
 278
 279 void
 280 malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
 281 {
 282
 283         if (size > 0)
 284                 malloc_type_zone_allocated(mtp, size, -1);
 285 }
 286
 287 /*
 288  * A free operation has occurred -- update malloc type statistics for the
 289  * amount of the bucket size.  Occurs within a critical section so that the
 290  * thread isn't preempted and doesn't migrate while updating per-CPU
 291  * statistics.
 292  */
 293 void
 294 malloc_type_freed(struct malloc_type *mtp, unsigned long size)
 295 {
 296         struct malloc_type_internal *mtip;
 297         struct malloc_type_stats *mtsp;
 298
 299         critical_enter();
 300         mtip = mtp->ks_handle;
 301         mtsp = &mtip->mti_stats[curcpu];
 302         mtsp->mts_memfreed += size;
 303         mtsp->mts_numfrees++;
 304
 305 #ifdef KDTRACE_HOOKS
 306         if (dtrace_malloc_probe != NULL) {
 307                 uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_FREE];
 308                 if (probe_id != 0)
 309                         (dtrace_malloc_probe)(probe_id,
 310                             (uintptr_t) mtp, (uintptr_t) mtip,
 311                             (uintptr_t) mtsp, size, 0);
 312         }
 313 #endif
 314
 315         critical_exit();
 316 }
 317
 318 /*
 319  *      malloc:
 320  *
 321  *      Allocate a block of memory.
 322  *
 323  *      If M_NOWAIT is set, this routine will not block and return NULL if
 324  *      the allocation fails.
 325  */
 326 void *
 327 malloc(unsigned long size, struct malloc_type *mtp, int flags)
 328 {
 329         int indx;
 330         caddr_t va;
 331         uma_zone_t zone;
 332         uma_keg_t keg;
 333 #if defined(DIAGNOSTIC) || defined(DEBUG_REDZONE)
 334         unsigned long osize = size;
 335 #endif
 336
 337 #ifdef INVARIANTS
 338         /*
 339          * Check that exactly one of M_WAITOK or M_NOWAIT is specified.
 340          */
 341         indx = flags & (M_WAITOK | M_NOWAIT);
 342         if (indx != M_NOWAIT && indx != M_WAITOK) {
 343                 static  struct timeval lasterr;
 344                 static  int curerr, once;
 345                 if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
 346                         printf("Bad malloc flags: %x\n", indx);
 347                         kdb_backtrace();
 348                         flags |= M_WAITOK;
 349                         once++;
 350                 }
 351         }
 352 #endif
 353 #ifdef MALLOC_MAKE_FAILURES
 354         if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
 355                 atomic_add_int(&malloc_nowait_count, 1);
 356                 if ((malloc_nowait_count % malloc_failure_rate) == 0) {
 357                         atomic_add_int(&malloc_failure_count, 1);
 358                         t_malloc_fail = time_uptime;
 359                         return (NULL);
 360                 }
 361         }
 362 #endif
 363         if (flags & M_WAITOK)
 364                 KASSERT(curthread->td_intr_nesting_level == 0,
 365                    ("malloc(M_WAITOK) in interrupt context"));
 366
 367 #ifdef DEBUG_MEMGUARD
 368         if (memguard_cmp(mtp))
 369                 return memguard_alloc(size, flags);
 370 #endif
 371
 372 #ifdef DEBUG_REDZONE
 373         size = redzone_size_ntor(size);
 374 #endif
 375
 376         if (size <= KMEM_ZMAX) {
 377                 if (size & KMEM_ZMASK)
 378                         size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
 379                 indx = kmemsize[size >> KMEM_ZSHIFT];
 380                 zone = kmemzones[indx].kz_zone;
 381                 keg = zone->uz_keg;
 382 #ifdef MALLOC_PROFILE
 383                 krequests[size >> KMEM_ZSHIFT]++;
 384 #endif
 385                 va = uma_zalloc(zone, flags);
 386                 if (va != NULL)
 387                         size = keg->uk_size;
 388                 malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
 389         } else {
 390                 size = roundup(size, PAGE_SIZE);
 391                 zone = NULL;
 392                 keg = NULL;
 393                 va = uma_large_malloc(size, flags);
 394                 malloc_type_allocated(mtp, va == NULL ? 0 : size);
 395         }
 396         if (flags & M_WAITOK)
 397                 KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
 398         else if (va == NULL)
 399                 t_malloc_fail = time_uptime;
 400 #ifdef DIAGNOSTIC
 401         if (va != NULL && !(flags & M_ZERO)) {
 402                 memset(va, 0x70, osize);
 403         }
 404 #endif
 405 #ifdef DEBUG_REDZONE
 406         if (va != NULL)
 407                 va = redzone_setup(va, osize);
 408 #endif
 409         return ((void *) va);
 410 }
 411
 412 /*
 413  *      free:
 414  *
 415  *      Free a block of memory allocated by malloc.
 416  *
 417  *      This routine may not block.
 418  */
 419 void
 420 free(void *addr, struct malloc_type *mtp)
 421 {
 422         uma_slab_t slab;
 423         u_long size;
 424
 425         /* free(NULL, ...) does nothing */
 426         if (addr == NULL)
 427                 return;
 428
 429 #ifdef DEBUG_MEMGUARD
 430         if (memguard_cmp(mtp)) {
 431                 memguard_free(addr);
 432                 return;
 433         }
 434 #endif
 435
 436 #ifdef DEBUG_REDZONE
 437         redzone_check(addr);
 438         addr = redzone_addr_ntor(addr);
 439 #endif
 440
 441         size = 0;
 442
 443         slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
 444
 445         if (slab == NULL)
 446                 panic("free: address %p(%p) has not been allocated.\n",
 447                     addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
 448
 449
 450         if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
 451 #ifdef INVARIANTS
 452                 struct malloc_type **mtpp = addr;
 453 #endif
 454                 size = slab->us_keg->uk_size;
 455 #ifdef INVARIANTS
 456                 /*
 457                  * Cache a pointer to the malloc_type that most recently freed
 458                  * this memory here.  This way we know who is most likely to
 459                  * have stepped on it later.
 460                  *
 461                  * This code assumes that size is a multiple of 8 bytes for
 462                  * 64 bit machines
 463                  */
 464                 mtpp = (struct malloc_type **)
 465                     ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
 466                 mtpp += (size - sizeof(struct malloc_type *)) /
 467                     sizeof(struct malloc_type *);
 468                 *mtpp = mtp;
 469 #endif
 470                 uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
 471         } else {
 472                 size = slab->us_size;
 473                 uma_large_free(slab);
 474         }
 475         malloc_type_freed(mtp, size);
 476 }
 477
 478 /*
 479  *      realloc: change the size of a memory block
 480  */
 481 void *
 482 realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
 483 {
 484         uma_slab_t slab;
 485         unsigned long alloc;
 486         void *newaddr;
 487
 488         /* realloc(NULL, ...) is equivalent to malloc(...) */
 489         if (addr == NULL)
 490                 return (malloc(size, mtp, flags));
 491
 492         /*
 493          * XXX: Should report free of old memory and alloc of new memory to
 494          * per-CPU stats.
 495          */
 496
 497 #ifdef DEBUG_MEMGUARD
 498 if (memguard_cmp(mtp)) {
 499         slab = NULL;
 500         alloc = size;
 501 } else {
 502 #endif
 503
 504 #ifdef DEBUG_REDZONE
 505         slab = NULL;
 506         alloc = redzone_get_size(addr);
 507 #else
 508         slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
 509
 510         /* Sanity check */
 511         KASSERT(slab != NULL,
 512             ("realloc: address %p out of range", (void *)addr));
 513
 514         /* Get the size of the original block */
 515         if (!(slab->us_flags & UMA_SLAB_MALLOC))
 516                 alloc = slab->us_keg->uk_size;
 517         else
 518                 alloc = slab->us_size;
 519
 520         /* Reuse the original block if appropriate */
 521         if (size <= alloc
 522             && (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
 523                 return (addr);
 524 #endif /* !DEBUG_REDZONE */
 525
 526 #ifdef DEBUG_MEMGUARD
 527 }
 528 #endif
 529
 530         /* Allocate a new, bigger (or smaller) block */
 531         if ((newaddr = malloc(size, mtp, flags)) == NULL)
 532                 return (NULL);
 533
 534         /* Copy over original contents */
 535         bcopy(addr, newaddr, min(size, alloc));
 536         free(addr, mtp);
 537         return (newaddr);
 538 }
 539
 540 /*
 541  *      reallocf: same as realloc() but free memory on failure.
 542  */
 543 void *
 544 reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
 545 {
 546         void *mem;
 547
 548         if ((mem = realloc(addr, size, mtp, flags)) == NULL)
 549                 free(addr, mtp);
 550         return (mem);
 551 }
 552
 553 /*
 554  * Initialize the kernel memory allocator
 555  */
 556 /* ARGSUSED*/
 557 static void
 558 kmeminit(void *dummy)
 559 {
 560         u_int8_t indx;
 561         u_long mem_size;
 562         int i;
 563
 564         mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
 565
 566         /*
 567          * Try to auto-tune the kernel memory size, so that it is
 568          * more applicable for a wider range of machine sizes.
 569          * On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
 570          * a VM_KMEM_SIZE of 12MB is a fair compromise.  The
 571          * VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
 572          * available, and on an X86 with a total KVA space of 256MB,
 573          * try to keep VM_KMEM_SIZE_MAX at 80MB or below.
 574          *
 575          * Note that the kmem_map is also used by the zone allocator,
 576          * so make sure that there is enough space.
 577          */
 578         vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
 579         mem_size = cnt.v_page_count;
 580
 581 #if defined(VM_KMEM_SIZE_SCALE)
 582         vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
 583 #endif
 584         TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
 585         if (vm_kmem_size_scale > 0 &&
 586             (mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
 587                 vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
 588
 589 #if defined(VM_KMEM_SIZE_MIN)
 590         vm_kmem_size_min = VM_KMEM_SIZE_MIN;
 591 #endif
 592         TUNABLE_ULONG_FETCH("vm.kmem_size_min", &vm_kmem_size_min);
 593         if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min) {
 594                 vm_kmem_size = vm_kmem_size_min;
 595         }
 596
 597 #if defined(VM_KMEM_SIZE_MAX)
 598         vm_kmem_size_max = VM_KMEM_SIZE_MAX;
 599 #endif
 600         TUNABLE_ULONG_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
 601         if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
 602                 vm_kmem_size = vm_kmem_size_max;
 603
 604         /* Allow final override from the kernel environment */
 605 #ifndef BURN_BRIDGES
 606         if (TUNABLE_ULONG_FETCH("kern.vm.kmem.size", &vm_kmem_size) != 0)
 607                 printf("kern.vm.kmem.size is now called vm.kmem_size!\n");
 608 #endif
 609         TUNABLE_ULONG_FETCH("vm.kmem_size", &vm_kmem_size);
 610
 611         /*
 612          * Limit kmem virtual size to twice the physical memory.
 613          * This allows for kmem map sparseness, but limits the size
 614          * to something sane. Be careful to not overflow the 32bit
 615          * ints while doing the check.
 616          */
 617         if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count)
 618                 vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE;
 619
 620         /*
 621          * Tune settings based on the kmem map's size at this time.
 622          */
 623         init_param3(vm_kmem_size / PAGE_SIZE);
 624
 625         kmem_map = kmem_suballoc(kernel_map, &kmembase, &kmemlimit,
 626             vm_kmem_size, TRUE);
 627         kmem_map->system_map = 1;
 628
 629 #ifdef DEBUG_MEMGUARD
 630         /*
 631          * Initialize MemGuard if support compiled in.  MemGuard is a
 632          * replacement allocator used for detecting tamper-after-free
 633          * scenarios as they occur.  It is only used for debugging.
 634          */
 635         vm_memguard_divisor = 10;
 636         TUNABLE_INT_FETCH("vm.memguard.divisor", &vm_memguard_divisor);
 637
 638         /* Pick a conservative value if provided value sucks. */
 639         if ((vm_memguard_divisor <= 0) ||
 640             ((vm_kmem_size / vm_memguard_divisor) == 0))
 641                 vm_memguard_divisor = 10;
 642         memguard_init(kmem_map, vm_kmem_size / vm_memguard_divisor);
 643 #endif
 644
 645         uma_startup2();
 646
 647         mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
 648 #ifdef INVARIANTS
 649             mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
 650 #else
 651             NULL, NULL, NULL, NULL,
 652 #endif
 653             UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
 654         for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
 655                 int size = kmemzones[indx].kz_size;
 656                 char *name = kmemzones[indx].kz_name;
 657
 658                 kmemzones[indx].kz_zone = uma_zcreate(name, size,
 659 #ifdef INVARIANTS
 660                     mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
 661 #else
 662                     NULL, NULL, NULL, NULL,
 663 #endif
 664                     UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
 665
 666                 for (;i <= size; i+= KMEM_ZBASE)
 667                         kmemsize[i >> KMEM_ZSHIFT] = indx;
 668
 669         }
 670 }
 671
 672 void
 673 malloc_init(void *data)
 674 {
 675         struct malloc_type_internal *mtip;
 676         struct malloc_type *mtp;
 677
 678         KASSERT(cnt.v_page_count != 0, ("malloc_register before vm_init"));
 679
 680         mtp = data;
 681         mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
 682         mtp->ks_handle = mtip;
 683
 684         mtx_lock(&malloc_mtx);
 685         mtp->ks_next = kmemstatistics;
 686         kmemstatistics = mtp;
 687         kmemcount++;
 688         mtx_unlock(&malloc_mtx);
 689 }
 690
 691 void
 692 malloc_uninit(void *data)
 693 {
 694         struct malloc_type_internal *mtip;
 695         struct malloc_type_stats *mtsp;
 696         struct malloc_type *mtp, *temp;
 697         uma_slab_t slab;
 698         long temp_allocs, temp_bytes;
 699         int i;
 700
 701         mtp = data;
 702         KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
 703         mtx_lock(&malloc_mtx);
 704         mtip = mtp->ks_handle;
 705         mtp->ks_handle = NULL;
 706         if (mtp != kmemstatistics) {
 707                 for (temp = kmemstatistics; temp != NULL;
 708                     temp = temp->ks_next) {
 709                         if (temp->ks_next == mtp)
 710                                 temp->ks_next = mtp->ks_next;
 711                 }
 712         } else
 713                 kmemstatistics = mtp->ks_next;
 714         kmemcount--;
 715         mtx_unlock(&malloc_mtx);
 716
 717         /*
 718          * Look for memory leaks.
 719          */
 720         temp_allocs = temp_bytes = 0;
 721         for (i = 0; i < MAXCPU; i++) {
 722                 mtsp = &mtip->mti_stats[i];
 723                 temp_allocs += mtsp->mts_numallocs;
 724                 temp_allocs -= mtsp->mts_numfrees;
 725                 temp_bytes += mtsp->mts_memalloced;
 726                 temp_bytes -= mtsp->mts_memfreed;
 727         }
 728         if (temp_allocs > 0 || temp_bytes > 0) {
 729                 printf("Warning: memory type %s leaked memory on destroy "
 730                     "(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
 731                     temp_allocs, temp_bytes);
 732         }
 733
 734         slab = vtoslab((vm_offset_t) mtip & (~UMA_SLAB_MASK));
 735         uma_zfree_arg(mt_zone, mtip, slab);
 736 }
 737
 738 struct malloc_type *
 739 malloc_desc2type(const char *desc)
 740 {
 741         struct malloc_type *mtp;
 742
 743         mtx_assert(&malloc_mtx, MA_OWNED);
 744         for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
 745                 if (strcmp(mtp->ks_shortdesc, desc) == 0)
 746                         return (mtp);
 747         }
 748         return (NULL);
 749 }
 750
 751 static int
 752 sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
 753 {
 754         struct malloc_type_stream_header mtsh;
 755         struct malloc_type_internal *mtip;
 756         struct malloc_type_header mth;
 757         struct malloc_type *mtp;
 758         int buflen, count, error, i;
 759         struct sbuf sbuf;
 760         char *buffer;
 761
 762         mtx_lock(&malloc_mtx);
 763 restart:
 764         mtx_assert(&malloc_mtx, MA_OWNED);
 765         count = kmemcount;
 766         mtx_unlock(&malloc_mtx);
 767         buflen = sizeof(mtsh) + count * (sizeof(mth) +
 768             sizeof(struct malloc_type_stats) * MAXCPU) + 1;
 769         buffer = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
 770         mtx_lock(&malloc_mtx);
 771         if (count < kmemcount) {
 772                 free(buffer, M_TEMP);
 773                 goto restart;
 774         }
 775
 776         sbuf_new(&sbuf, buffer, buflen, SBUF_FIXEDLEN);
 777
 778         /*
 779          * Insert stream header.
 780          */
 781         bzero(&mtsh, sizeof(mtsh));
 782         mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
 783         mtsh.mtsh_maxcpus = MAXCPU;
 784         mtsh.mtsh_count = kmemcount;
 785         if (sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh)) < 0) {
 786                 mtx_unlock(&malloc_mtx);
 787                 error = ENOMEM;
 788                 goto out;
 789         }
 790
 791         /*
 792          * Insert alternating sequence of type headers and type statistics.
 793          */
 794         for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
 795                 mtip = (struct malloc_type_internal *)mtp->ks_handle;
 796
 797                 /*
 798                  * Insert type header.
 799                  */
 800                 bzero(&mth, sizeof(mth));
 801                 strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
 802                 if (sbuf_bcat(&sbuf, &mth, sizeof(mth)) < 0) {
 803                         mtx_unlock(&malloc_mtx);
 804                         error = ENOMEM;
 805                         goto out;
 806                 }
 807
 808                 /*
 809                  * Insert type statistics for each CPU.
 810                  */
 811                 for (i = 0; i < MAXCPU; i++) {
 812                         if (sbuf_bcat(&sbuf, &mtip->mti_stats[i],
 813                             sizeof(mtip->mti_stats[i])) < 0) {
 814                                 mtx_unlock(&malloc_mtx);
 815                                 error = ENOMEM;
 816                                 goto out;
 817                         }
 818                 }
 819         }
 820         mtx_unlock(&malloc_mtx);
 821         sbuf_finish(&sbuf);
 822         error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
 823 out:
 824         sbuf_delete(&sbuf);
 825         free(buffer, M_TEMP);
 826         return (error);
 827 }
 828
 829 SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
 830     0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
 831     "Return malloc types");
 832
 833 SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
 834     "Count of kernel malloc types");
 835
 836 void
 837 malloc_type_list(malloc_type_list_func_t *func, void *arg)
 838 {
 839         struct malloc_type *mtp, **bufmtp;
 840         int count, i;
 841         size_t buflen;
 842
 843         mtx_lock(&malloc_mtx);
 844 restart:
 845         mtx_assert(&malloc_mtx, MA_OWNED);
 846         count = kmemcount;
 847         mtx_unlock(&malloc_mtx);
 848
 849         buflen = sizeof(struct malloc_type *) * count;
 850         bufmtp = malloc(buflen, M_TEMP, M_WAITOK);
 851
 852         mtx_lock(&malloc_mtx);
 853
 854         if (count < kmemcount) {
 855                 free(bufmtp, M_TEMP);
 856                 goto restart;
 857         }
 858
 859         for (mtp = kmemstatistics, i = 0; mtp != NULL; mtp = mtp->ks_next, i++)
 860                 bufmtp[i] = mtp;
 861
 862         mtx_unlock(&malloc_mtx);
 863
 864         for (i = 0; i < count; i++)
 865                 (func)(bufmtp[i], arg);
 866
 867         free(bufmtp, M_TEMP);
 868 }
 869
 870 #ifdef DDB
 871 DB_SHOW_COMMAND(malloc, db_show_malloc)
 872 {
 873         struct malloc_type_internal *mtip;
 874         struct malloc_type *mtp;
 875         u_int64_t allocs, frees;
 876         u_int64_t alloced, freed;
 877         int i;
 878
 879         db_printf("%18s %12s  %12s %12s\n", "Type", "InUse", "MemUse",
 880             "Requests");
 881         for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
 882                 mtip = (struct malloc_type_internal *)mtp->ks_handle;
 883                 allocs = 0;
 884                 frees = 0;
 885                 alloced = 0;
 886                 freed = 0;
 887                 for (i = 0; i < MAXCPU; i++) {
 888                         allocs += mtip->mti_stats[i].mts_numallocs;
 889                         frees += mtip->mti_stats[i].mts_numfrees;
 890                         alloced += mtip->mti_stats[i].mts_memalloced;
 891                         freed += mtip->mti_stats[i].mts_memfreed;
 892                 }
 893                 db_printf("%18s %12ju %12juK %12ju\n",
 894                     mtp->ks_shortdesc, allocs - frees,
 895                     (alloced - freed + 1023) / 1024, allocs);
 896         }
 897 }
 898 #endif
 899
 900 #ifdef MALLOC_PROFILE
 901
 902 static int
 903 sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
 904 {
 905         int linesize = 64;
 906         struct sbuf sbuf;
 907         uint64_t count;
 908         uint64_t waste;
 909         uint64_t mem;
 910         int bufsize;
 911         int error;
 912         char *buf;
 913         int rsize;
 914         int size;
 915         int i;
 916
 917         bufsize = linesize * (KMEM_ZSIZE + 1);
 918         bufsize += 128;         /* For the stats line */
 919         bufsize += 128;         /* For the banner line */
 920         waste = 0;
 921         mem = 0;
 922
 923         buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
 924         sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
 925         sbuf_printf(&sbuf,
 926             "\n  Size                    Requests  Real Size\n");
 927         for (i = 0; i < KMEM_ZSIZE; i++) {
 928                 size = i << KMEM_ZSHIFT;
 929                 rsize = kmemzones[kmemsize[i]].kz_size;
 930                 count = (long long unsigned)krequests[i];
 931
 932                 sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
 933                     (unsigned long long)count, rsize);
 934
 935                 if ((rsize * count) > (size * count))
 936                         waste += (rsize * count) - (size * count);
 937                 mem += (rsize * count);
 938         }
 939         sbuf_printf(&sbuf,
 940             "\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
 941             (unsigned long long)mem, (unsigned long long)waste);
 942         sbuf_finish(&sbuf);
 943
 944         error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
 945
 946         sbuf_delete(&sbuf);
 947         free(buf, M_TEMP);
 948         return (error);
 949 }
 950
 951 SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
 952     NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
 953 #endif /* MALLOC_PROFILE */