2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2005-2009 Robert N. M. Watson
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8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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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
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31 * @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
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
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
49 #include "opt_kdtrace.h"
52 #include <sys/param.h>
53 #include <sys/systm.h>
55 #include <sys/kernel.h>
57 #include <sys/malloc.h>
59 #include <sys/mutex.h>
60 #include <sys/vmmeter.h>
63 #include <sys/sysctl.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>
74 #include <vm/uma_int.h>
75 #include <vm/uma_dbg.h>
78 #include <vm/memguard.h>
81 #include <vm/redzone.h>
84 #if defined(INVARIANTS) && defined(__i386__)
85 #include <machine/cpu.h>
91 #include <sys/dtrace_bsd.h>
93 dtrace_malloc_probe_func_t dtrace_malloc_probe;
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'.
102 #ifndef REALLOC_FRACTION
103 #define REALLOC_FRACTION 1 /* new block if <= half the size */
107 * Centrally define some common malloc types.
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");
113 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
114 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
116 static void kmeminit(void *);
117 SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL);
119 static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
121 static struct malloc_type *kmemstatistics;
122 static vm_offset_t kmembase;
123 static vm_offset_t kmemlimit;
124 static int kmemcount;
126 #define KMEM_ZSHIFT 4
127 #define KMEM_ZBASE 16
128 #define KMEM_ZMASK (KMEM_ZBASE - 1)
130 #define KMEM_ZMAX PAGE_SIZE
131 #define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
132 static uint8_t kmemsize[KMEM_ZSIZE + 1];
134 #ifndef MALLOC_DEBUG_MAXZONES
135 #define MALLOC_DEBUG_MAXZONES 1
137 static int numzones = MALLOC_DEBUG_MAXZONES;
140 * Small malloc(9) memory allocations are allocated from a set of UMA buckets
143 * XXX: The comment here used to read "These won't be powers of two for
144 * long." It's possible that a significant amount of wasted memory could be
145 * recovered by tuning the sizes of these buckets.
150 uma_zone_t kz_zone[MALLOC_DEBUG_MAXZONES];
165 #if PAGE_SIZE > 16384
167 #if PAGE_SIZE > 32768
169 #if PAGE_SIZE > 65536
170 #error "Unsupported PAGE_SIZE"
180 * Zone to allocate malloc type descriptions from. For ABI reasons, memory
181 * types are described by a data structure passed by the declaring code, but
182 * the malloc(9) implementation has its own data structure describing the
183 * type and statistics. This permits the malloc(9)-internal data structures
184 * to be modified without breaking binary-compiled kernel modules that
185 * declare malloc types.
187 static uma_zone_t mt_zone;
190 SYSCTL_ULONG(_vm, OID_AUTO, kmem_size, CTLFLAG_RDTUN, &vm_kmem_size, 0,
191 "Size of kernel memory");
193 static u_long vm_kmem_size_min;
194 SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RDTUN, &vm_kmem_size_min, 0,
195 "Minimum size of kernel memory");
197 static u_long vm_kmem_size_max;
198 SYSCTL_ULONG(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RDTUN, &vm_kmem_size_max, 0,
199 "Maximum size of kernel memory");
201 static u_int vm_kmem_size_scale;
202 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RDTUN, &vm_kmem_size_scale, 0,
203 "Scale factor for kernel memory size");
205 static int sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS);
206 SYSCTL_PROC(_vm, OID_AUTO, kmem_map_size,
207 CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
208 sysctl_kmem_map_size, "LU", "Current kmem_map allocation size");
210 static int sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS);
211 SYSCTL_PROC(_vm, OID_AUTO, kmem_map_free,
212 CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
213 sysctl_kmem_map_free, "LU", "Largest contiguous free range in kmem_map");
216 * The malloc_mtx protects the kmemstatistics linked list.
218 struct mtx malloc_mtx;
220 #ifdef MALLOC_PROFILE
221 uint64_t krequests[KMEM_ZSIZE + 1];
223 static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
226 static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
229 * time_uptime of the last malloc(9) failure (induced or real).
231 static time_t t_malloc_fail;
233 #if defined(MALLOC_MAKE_FAILURES) || (MALLOC_DEBUG_MAXZONES > 1)
234 SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
235 "Kernel malloc debugging options");
239 * malloc(9) fault injection -- cause malloc failures every (n) mallocs when
240 * the caller specifies M_NOWAIT. If set to 0, no failures are caused.
242 #ifdef MALLOC_MAKE_FAILURES
243 static int malloc_failure_rate;
244 static int malloc_nowait_count;
245 static int malloc_failure_count;
246 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
247 &malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
248 TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
249 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
250 &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
254 sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS)
258 size = kmem_map->size;
259 return (sysctl_handle_long(oidp, &size, 0, req));
263 sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS)
267 vm_map_lock_read(kmem_map);
268 size = kmem_map->root != NULL ? kmem_map->root->max_free :
269 kmem_map->max_offset - kmem_map->min_offset;
270 vm_map_unlock_read(kmem_map);
271 return (sysctl_handle_long(oidp, &size, 0, req));
275 * malloc(9) uma zone separation -- sub-page buffer overruns in one
276 * malloc type will affect only a subset of other malloc types.
278 #if MALLOC_DEBUG_MAXZONES > 1
280 tunable_set_numzones(void)
283 TUNABLE_INT_FETCH("debug.malloc.numzones",
286 /* Sanity check the number of malloc uma zones. */
289 if (numzones > MALLOC_DEBUG_MAXZONES)
290 numzones = MALLOC_DEBUG_MAXZONES;
292 SYSINIT(numzones, SI_SUB_TUNABLES, SI_ORDER_ANY, tunable_set_numzones, NULL);
293 SYSCTL_INT(_debug_malloc, OID_AUTO, numzones, CTLFLAG_RDTUN,
294 &numzones, 0, "Number of malloc uma subzones");
297 * Any number that changes regularly is an okay choice for the
298 * offset. Build numbers are pretty good of you have them.
300 static u_int zone_offset = __FreeBSD_version;
301 TUNABLE_INT("debug.malloc.zone_offset", &zone_offset);
302 SYSCTL_UINT(_debug_malloc, OID_AUTO, zone_offset, CTLFLAG_RDTUN,
303 &zone_offset, 0, "Separate malloc types by examining the "
304 "Nth character in the malloc type short description.");
307 mtp_get_subzone(const char *desc)
312 if (desc == NULL || (len = strlen(desc)) == 0)
314 val = desc[zone_offset % len];
315 return (val % numzones);
317 #elif MALLOC_DEBUG_MAXZONES == 0
318 #error "MALLOC_DEBUG_MAXZONES must be positive."
321 mtp_get_subzone(const char *desc)
326 #endif /* MALLOC_DEBUG_MAXZONES > 1 */
329 malloc_last_fail(void)
332 return (time_uptime - t_malloc_fail);
336 * An allocation has succeeded -- update malloc type statistics for the
337 * amount of bucket size. Occurs within a critical section so that the
338 * thread isn't preempted and doesn't migrate while updating per-PCU
342 malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
345 struct malloc_type_internal *mtip;
346 struct malloc_type_stats *mtsp;
349 mtip = mtp->ks_handle;
350 mtsp = &mtip->mti_stats[curcpu];
352 mtsp->mts_memalloced += size;
353 mtsp->mts_numallocs++;
356 mtsp->mts_size |= 1 << zindx;
359 if (dtrace_malloc_probe != NULL) {
360 uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_MALLOC];
362 (dtrace_malloc_probe)(probe_id,
363 (uintptr_t) mtp, (uintptr_t) mtip,
364 (uintptr_t) mtsp, size, zindx);
372 malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
376 malloc_type_zone_allocated(mtp, size, -1);
380 * A free operation has occurred -- update malloc type statistics for the
381 * amount of the bucket size. Occurs within a critical section so that the
382 * thread isn't preempted and doesn't migrate while updating per-CPU
386 malloc_type_freed(struct malloc_type *mtp, unsigned long size)
388 struct malloc_type_internal *mtip;
389 struct malloc_type_stats *mtsp;
392 mtip = mtp->ks_handle;
393 mtsp = &mtip->mti_stats[curcpu];
394 mtsp->mts_memfreed += size;
395 mtsp->mts_numfrees++;
398 if (dtrace_malloc_probe != NULL) {
399 uint32_t probe_id = mtip->mti_probes[DTMALLOC_PROBE_FREE];
401 (dtrace_malloc_probe)(probe_id,
402 (uintptr_t) mtp, (uintptr_t) mtip,
403 (uintptr_t) mtsp, size, 0);
413 * Allocate a block of memory.
415 * If M_NOWAIT is set, this routine will not block and return NULL if
416 * the allocation fails.
419 malloc(unsigned long size, struct malloc_type *mtp, int flags)
422 struct malloc_type_internal *mtip;
425 #if defined(DIAGNOSTIC) || defined(DEBUG_REDZONE)
426 unsigned long osize = size;
430 KASSERT(mtp->ks_magic == M_MAGIC, ("malloc: bad malloc type magic"));
432 * Check that exactly one of M_WAITOK or M_NOWAIT is specified.
434 indx = flags & (M_WAITOK | M_NOWAIT);
435 if (indx != M_NOWAIT && indx != M_WAITOK) {
436 static struct timeval lasterr;
437 static int curerr, once;
438 if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
439 printf("Bad malloc flags: %x\n", indx);
446 #ifdef MALLOC_MAKE_FAILURES
447 if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
448 atomic_add_int(&malloc_nowait_count, 1);
449 if ((malloc_nowait_count % malloc_failure_rate) == 0) {
450 atomic_add_int(&malloc_failure_count, 1);
451 t_malloc_fail = time_uptime;
456 if (flags & M_WAITOK)
457 KASSERT(curthread->td_intr_nesting_level == 0,
458 ("malloc(M_WAITOK) in interrupt context"));
460 #ifdef DEBUG_MEMGUARD
461 if (memguard_cmp(mtp, size)) {
462 va = memguard_alloc(size, flags);
465 /* This is unfortunate but should not be fatal. */
470 size = redzone_size_ntor(size);
473 if (size <= KMEM_ZMAX) {
474 mtip = mtp->ks_handle;
475 if (size & KMEM_ZMASK)
476 size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
477 indx = kmemsize[size >> KMEM_ZSHIFT];
478 KASSERT(mtip->mti_zone < numzones,
479 ("mti_zone %u out of range %d",
480 mtip->mti_zone, numzones));
481 zone = kmemzones[indx].kz_zone[mtip->mti_zone];
482 #ifdef MALLOC_PROFILE
483 krequests[size >> KMEM_ZSHIFT]++;
485 va = uma_zalloc(zone, flags);
487 size = zone->uz_size;
488 malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
490 size = roundup(size, PAGE_SIZE);
492 va = uma_large_malloc(size, flags);
493 malloc_type_allocated(mtp, va == NULL ? 0 : size);
495 if (flags & M_WAITOK)
496 KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
498 t_malloc_fail = time_uptime;
500 if (va != NULL && !(flags & M_ZERO)) {
501 memset(va, 0x70, osize);
506 va = redzone_setup(va, osize);
508 return ((void *) va);
514 * Free a block of memory allocated by malloc.
516 * This routine may not block.
519 free(void *addr, struct malloc_type *mtp)
524 KASSERT(mtp->ks_magic == M_MAGIC, ("free: bad malloc type magic"));
526 /* free(NULL, ...) does nothing */
530 #ifdef DEBUG_MEMGUARD
531 if (is_memguard_addr(addr)) {
539 addr = redzone_addr_ntor(addr);
542 slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
545 panic("free: address %p(%p) has not been allocated.\n",
546 addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
549 if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
551 struct malloc_type **mtpp = addr;
553 size = slab->us_keg->uk_size;
556 * Cache a pointer to the malloc_type that most recently freed
557 * this memory here. This way we know who is most likely to
558 * have stepped on it later.
560 * This code assumes that size is a multiple of 8 bytes for
563 mtpp = (struct malloc_type **)
564 ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
565 mtpp += (size - sizeof(struct malloc_type *)) /
566 sizeof(struct malloc_type *);
569 uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
571 size = slab->us_size;
572 uma_large_free(slab);
574 malloc_type_freed(mtp, size);
578 * realloc: change the size of a memory block
581 realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
587 KASSERT(mtp->ks_magic == M_MAGIC,
588 ("realloc: bad malloc type magic"));
590 /* realloc(NULL, ...) is equivalent to malloc(...) */
592 return (malloc(size, mtp, flags));
595 * XXX: Should report free of old memory and alloc of new memory to
599 #ifdef DEBUG_MEMGUARD
600 if (is_memguard_addr(addr))
601 return (memguard_realloc(addr, size, mtp, flags));
606 alloc = redzone_get_size(addr);
608 slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
611 KASSERT(slab != NULL,
612 ("realloc: address %p out of range", (void *)addr));
614 /* Get the size of the original block */
615 if (!(slab->us_flags & UMA_SLAB_MALLOC))
616 alloc = slab->us_keg->uk_size;
618 alloc = slab->us_size;
620 /* Reuse the original block if appropriate */
622 && (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
624 #endif /* !DEBUG_REDZONE */
626 /* Allocate a new, bigger (or smaller) block */
627 if ((newaddr = malloc(size, mtp, flags)) == NULL)
630 /* Copy over original contents */
631 bcopy(addr, newaddr, min(size, alloc));
637 * reallocf: same as realloc() but free memory on failure.
640 reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
644 if ((mem = realloc(addr, size, mtp, flags)) == NULL)
650 * Initialize the kernel memory allocator
654 kmeminit(void *dummy)
657 u_long mem_size, tmp;
660 mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
663 * Try to auto-tune the kernel memory size, so that it is
664 * more applicable for a wider range of machine sizes. The
665 * VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
668 * Note that the kmem_map is also used by the zone allocator,
669 * so make sure that there is enough space.
671 vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
672 mem_size = cnt.v_page_count;
674 #if defined(VM_KMEM_SIZE_SCALE)
675 vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
677 TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
678 if (vm_kmem_size_scale > 0 &&
679 (mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
680 vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
682 #if defined(VM_KMEM_SIZE_MIN)
683 vm_kmem_size_min = VM_KMEM_SIZE_MIN;
685 TUNABLE_ULONG_FETCH("vm.kmem_size_min", &vm_kmem_size_min);
686 if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min) {
687 vm_kmem_size = vm_kmem_size_min;
690 #if defined(VM_KMEM_SIZE_MAX)
691 vm_kmem_size_max = VM_KMEM_SIZE_MAX;
693 TUNABLE_ULONG_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
694 if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
695 vm_kmem_size = vm_kmem_size_max;
697 /* Allow final override from the kernel environment */
698 TUNABLE_ULONG_FETCH("vm.kmem_size", &vm_kmem_size);
701 * Limit kmem virtual size to twice the physical memory.
702 * This allows for kmem map sparseness, but limits the size
703 * to something sane. Be careful to not overflow the 32bit
704 * ints while doing the check or the adjustment.
706 if (vm_kmem_size / 2 / PAGE_SIZE > mem_size)
707 vm_kmem_size = 2 * mem_size * PAGE_SIZE;
709 #ifdef DEBUG_MEMGUARD
710 tmp = memguard_fudge(vm_kmem_size, vm_kmem_size_max);
714 kmem_map = kmem_suballoc(kernel_map, &kmembase, &kmemlimit,
716 kmem_map->system_map = 1;
718 #ifdef DEBUG_MEMGUARD
720 * Initialize MemGuard if support compiled in. MemGuard is a
721 * replacement allocator used for detecting tamper-after-free
722 * scenarios as they occur. It is only used for debugging.
724 memguard_init(kmem_map);
729 mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
731 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
733 NULL, NULL, NULL, NULL,
735 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
736 for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
737 int size = kmemzones[indx].kz_size;
738 char *name = kmemzones[indx].kz_name;
741 for (subzone = 0; subzone < numzones; subzone++) {
742 kmemzones[indx].kz_zone[subzone] =
743 uma_zcreate(name, size,
745 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
747 NULL, NULL, NULL, NULL,
749 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
751 for (;i <= size; i+= KMEM_ZBASE)
752 kmemsize[i >> KMEM_ZSHIFT] = indx;
758 malloc_init(void *data)
760 struct malloc_type_internal *mtip;
761 struct malloc_type *mtp;
763 KASSERT(cnt.v_page_count != 0, ("malloc_register before vm_init"));
766 if (mtp->ks_magic != M_MAGIC)
767 panic("malloc_init: bad malloc type magic");
769 mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
770 mtp->ks_handle = mtip;
771 mtip->mti_zone = mtp_get_subzone(mtp->ks_shortdesc);
773 mtx_lock(&malloc_mtx);
774 mtp->ks_next = kmemstatistics;
775 kmemstatistics = mtp;
777 mtx_unlock(&malloc_mtx);
781 malloc_uninit(void *data)
783 struct malloc_type_internal *mtip;
784 struct malloc_type_stats *mtsp;
785 struct malloc_type *mtp, *temp;
787 long temp_allocs, temp_bytes;
791 KASSERT(mtp->ks_magic == M_MAGIC,
792 ("malloc_uninit: bad malloc type magic"));
793 KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
795 mtx_lock(&malloc_mtx);
796 mtip = mtp->ks_handle;
797 mtp->ks_handle = NULL;
798 if (mtp != kmemstatistics) {
799 for (temp = kmemstatistics; temp != NULL;
800 temp = temp->ks_next) {
801 if (temp->ks_next == mtp) {
802 temp->ks_next = mtp->ks_next;
807 ("malloc_uninit: type '%s' not found", mtp->ks_shortdesc));
809 kmemstatistics = mtp->ks_next;
811 mtx_unlock(&malloc_mtx);
814 * Look for memory leaks.
816 temp_allocs = temp_bytes = 0;
817 for (i = 0; i < MAXCPU; i++) {
818 mtsp = &mtip->mti_stats[i];
819 temp_allocs += mtsp->mts_numallocs;
820 temp_allocs -= mtsp->mts_numfrees;
821 temp_bytes += mtsp->mts_memalloced;
822 temp_bytes -= mtsp->mts_memfreed;
824 if (temp_allocs > 0 || temp_bytes > 0) {
825 printf("Warning: memory type %s leaked memory on destroy "
826 "(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
827 temp_allocs, temp_bytes);
830 slab = vtoslab((vm_offset_t) mtip & (~UMA_SLAB_MASK));
831 uma_zfree_arg(mt_zone, mtip, slab);
835 malloc_desc2type(const char *desc)
837 struct malloc_type *mtp;
839 mtx_assert(&malloc_mtx, MA_OWNED);
840 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
841 if (strcmp(mtp->ks_shortdesc, desc) == 0)
848 sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
850 struct malloc_type_stream_header mtsh;
851 struct malloc_type_internal *mtip;
852 struct malloc_type_header mth;
853 struct malloc_type *mtp;
857 error = sysctl_wire_old_buffer(req, 0);
860 sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
861 mtx_lock(&malloc_mtx);
864 * Insert stream header.
866 bzero(&mtsh, sizeof(mtsh));
867 mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
868 mtsh.mtsh_maxcpus = MAXCPU;
869 mtsh.mtsh_count = kmemcount;
870 (void)sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh));
873 * Insert alternating sequence of type headers and type statistics.
875 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
876 mtip = (struct malloc_type_internal *)mtp->ks_handle;
879 * Insert type header.
881 bzero(&mth, sizeof(mth));
882 strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
883 (void)sbuf_bcat(&sbuf, &mth, sizeof(mth));
886 * Insert type statistics for each CPU.
888 for (i = 0; i < MAXCPU; i++) {
889 (void)sbuf_bcat(&sbuf, &mtip->mti_stats[i],
890 sizeof(mtip->mti_stats[i]));
893 mtx_unlock(&malloc_mtx);
894 error = sbuf_finish(&sbuf);
899 SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
900 0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
901 "Return malloc types");
903 SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
904 "Count of kernel malloc types");
907 malloc_type_list(malloc_type_list_func_t *func, void *arg)
909 struct malloc_type *mtp, **bufmtp;
913 mtx_lock(&malloc_mtx);
915 mtx_assert(&malloc_mtx, MA_OWNED);
917 mtx_unlock(&malloc_mtx);
919 buflen = sizeof(struct malloc_type *) * count;
920 bufmtp = malloc(buflen, M_TEMP, M_WAITOK);
922 mtx_lock(&malloc_mtx);
924 if (count < kmemcount) {
925 free(bufmtp, M_TEMP);
929 for (mtp = kmemstatistics, i = 0; mtp != NULL; mtp = mtp->ks_next, i++)
932 mtx_unlock(&malloc_mtx);
934 for (i = 0; i < count; i++)
935 (func)(bufmtp[i], arg);
937 free(bufmtp, M_TEMP);
941 DB_SHOW_COMMAND(malloc, db_show_malloc)
943 struct malloc_type_internal *mtip;
944 struct malloc_type *mtp;
945 uint64_t allocs, frees;
946 uint64_t alloced, freed;
949 db_printf("%18s %12s %12s %12s\n", "Type", "InUse", "MemUse",
951 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
952 mtip = (struct malloc_type_internal *)mtp->ks_handle;
957 for (i = 0; i < MAXCPU; i++) {
958 allocs += mtip->mti_stats[i].mts_numallocs;
959 frees += mtip->mti_stats[i].mts_numfrees;
960 alloced += mtip->mti_stats[i].mts_memalloced;
961 freed += mtip->mti_stats[i].mts_memfreed;
963 db_printf("%18s %12ju %12juK %12ju\n",
964 mtp->ks_shortdesc, allocs - frees,
965 (alloced - freed + 1023) / 1024, allocs);
969 #if MALLOC_DEBUG_MAXZONES > 1
970 DB_SHOW_COMMAND(multizone_matches, db_show_multizone_matches)
972 struct malloc_type_internal *mtip;
973 struct malloc_type *mtp;
977 db_printf("Usage: show multizone_matches <malloc type/addr>\n");
981 if (mtp->ks_magic != M_MAGIC) {
982 db_printf("Magic %lx does not match expected %x\n",
983 mtp->ks_magic, M_MAGIC);
987 mtip = mtp->ks_handle;
988 subzone = mtip->mti_zone;
990 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
991 mtip = mtp->ks_handle;
992 if (mtip->mti_zone != subzone)
994 db_printf("%s\n", mtp->ks_shortdesc);
997 #endif /* MALLOC_DEBUG_MAXZONES > 1 */
1000 #ifdef MALLOC_PROFILE
1003 sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
1017 error = sysctl_wire_old_buffer(req, 0);
1020 sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
1022 "\n Size Requests Real Size\n");
1023 for (i = 0; i < KMEM_ZSIZE; i++) {
1024 size = i << KMEM_ZSHIFT;
1025 rsize = kmemzones[kmemsize[i]].kz_size;
1026 count = (long long unsigned)krequests[i];
1028 sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
1029 (unsigned long long)count, rsize);
1031 if ((rsize * count) > (size * count))
1032 waste += (rsize * count) - (size * count);
1033 mem += (rsize * count);
1036 "\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
1037 (unsigned long long)mem, (unsigned long long)waste);
1038 error = sbuf_finish(&sbuf);
1043 SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
1044 NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
1045 #endif /* MALLOC_PROFILE */