2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2005-2006 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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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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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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("$FreeBSD$");
51 #include <sys/param.h>
52 #include <sys/systm.h>
54 #include <sys/kernel.h>
56 #include <sys/malloc.h>
58 #include <sys/mutex.h>
59 #include <sys/vmmeter.h>
62 #include <sys/sysctl.h>
67 #include <vm/vm_param.h>
68 #include <vm/vm_kern.h>
69 #include <vm/vm_extern.h>
70 #include <vm/vm_map.h>
71 #include <vm/vm_page.h>
73 #include <vm/uma_int.h>
74 #include <vm/uma_dbg.h>
77 #include <vm/memguard.h>
80 #include <vm/redzone.h>
83 #if defined(INVARIANTS) && defined(__i386__)
84 #include <machine/cpu.h>
90 * When realloc() is called, if the new size is sufficiently smaller than
91 * the old size, realloc() will allocate a new, smaller block to avoid
92 * wasting memory. 'Sufficiently smaller' is defined as: newsize <=
93 * oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
95 #ifndef REALLOC_FRACTION
96 #define REALLOC_FRACTION 1 /* new block if <= half the size */
100 * Centrally define some common malloc types.
102 MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
103 MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
104 MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
106 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
107 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
109 static void kmeminit(void *);
110 SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL)
112 static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
114 static struct malloc_type *kmemstatistics;
115 static char *kmembase;
116 static char *kmemlimit;
117 static int kmemcount;
119 #define KMEM_ZSHIFT 4
120 #define KMEM_ZBASE 16
121 #define KMEM_ZMASK (KMEM_ZBASE - 1)
123 #define KMEM_ZMAX PAGE_SIZE
124 #define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
125 static u_int8_t kmemsize[KMEM_ZSIZE + 1];
128 * Small malloc(9) memory allocations are allocated from a set of UMA buckets
131 * XXX: The comment here used to read "These won't be powers of two for
132 * long." It's possible that a significant amount of wasted memory could be
133 * recovered by tuning the sizes of these buckets.
146 {1024, "1024", NULL},
147 {2048, "2048", NULL},
148 {4096, "4096", NULL},
150 {8192, "8192", NULL},
152 {16384, "16384", NULL},
153 #if PAGE_SIZE > 16384
154 {32768, "32768", NULL},
155 #if PAGE_SIZE > 32768
156 {65536, "65536", NULL},
157 #if PAGE_SIZE > 65536
158 #error "Unsupported PAGE_SIZE"
168 * Zone to allocate malloc type descriptions from. For ABI reasons, memory
169 * types are described by a data structure passed by the declaring code, but
170 * the malloc(9) implementation has its own data structure describing the
171 * type and statistics. This permits the malloc(9)-internal data structures
172 * to be modified without breaking binary-compiled kernel modules that
173 * declare malloc types.
175 static uma_zone_t mt_zone;
178 SYSCTL_UINT(_vm, OID_AUTO, kmem_size, CTLFLAG_RD, &vm_kmem_size, 0,
179 "Size of kernel memory");
181 u_int vm_kmem_size_min;
182 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_min, CTLFLAG_RD, &vm_kmem_size_min, 0,
183 "Minimum size of kernel memory");
185 u_int vm_kmem_size_max;
186 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RD, &vm_kmem_size_max, 0,
187 "Maximum size of kernel memory");
189 u_int vm_kmem_size_scale;
190 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RD, &vm_kmem_size_scale, 0,
191 "Scale factor for kernel memory size");
194 * The malloc_mtx protects the kmemstatistics linked list.
196 struct mtx malloc_mtx;
198 #ifdef MALLOC_PROFILE
199 uint64_t krequests[KMEM_ZSIZE + 1];
201 static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
204 static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
207 * time_uptime of the last malloc(9) failure (induced or real).
209 static time_t t_malloc_fail;
212 * malloc(9) fault injection -- cause malloc failures every (n) mallocs when
213 * the caller specifies M_NOWAIT. If set to 0, no failures are caused.
215 #ifdef MALLOC_MAKE_FAILURES
216 SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
217 "Kernel malloc debugging options");
219 static int malloc_failure_rate;
220 static int malloc_nowait_count;
221 static int malloc_failure_count;
222 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
223 &malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
224 TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
225 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
226 &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
230 malloc_last_fail(void)
233 return (time_uptime - t_malloc_fail);
237 * An allocation has succeeded -- update malloc type statistics for the
238 * amount of bucket size. Occurs within a critical section so that the
239 * thread isn't preempted and doesn't migrate while updating per-PCU
243 malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
246 struct malloc_type_internal *mtip;
247 struct malloc_type_stats *mtsp;
250 mtip = mtp->ks_handle;
251 mtsp = &mtip->mti_stats[curcpu];
253 mtsp->mts_memalloced += size;
254 mtsp->mts_numallocs++;
257 mtsp->mts_size |= 1 << zindx;
262 malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
266 malloc_type_zone_allocated(mtp, size, -1);
270 * A free operation has occurred -- update malloc type statistis for the
271 * amount of the bucket size. Occurs within a critical section so that the
272 * thread isn't preempted and doesn't migrate while updating per-CPU
276 malloc_type_freed(struct malloc_type *mtp, unsigned long size)
278 struct malloc_type_internal *mtip;
279 struct malloc_type_stats *mtsp;
282 mtip = mtp->ks_handle;
283 mtsp = &mtip->mti_stats[curcpu];
284 mtsp->mts_memfreed += size;
285 mtsp->mts_numfrees++;
292 * Allocate a block of memory.
294 * If M_NOWAIT is set, this routine will not block and return NULL if
295 * the allocation fails.
298 malloc(unsigned long size, struct malloc_type *mtp, int flags)
304 #if defined(DIAGNOSTIC) || defined(DEBUG_REDZONE)
305 unsigned long osize = size;
310 * Check that exactly one of M_WAITOK or M_NOWAIT is specified.
312 indx = flags & (M_WAITOK | M_NOWAIT);
313 if (indx != M_NOWAIT && indx != M_WAITOK) {
314 static struct timeval lasterr;
315 static int curerr, once;
316 if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
317 printf("Bad malloc flags: %x\n", indx);
326 kdb_enter("zero size malloc");
328 #ifdef MALLOC_MAKE_FAILURES
329 if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
330 atomic_add_int(&malloc_nowait_count, 1);
331 if ((malloc_nowait_count % malloc_failure_rate) == 0) {
332 atomic_add_int(&malloc_failure_count, 1);
333 t_malloc_fail = time_uptime;
338 if (flags & M_WAITOK)
339 KASSERT(curthread->td_intr_nesting_level == 0,
340 ("malloc(M_WAITOK) in interrupt context"));
342 #ifdef DEBUG_MEMGUARD
343 if (memguard_cmp(mtp))
344 return memguard_alloc(size, flags);
348 size = redzone_size_ntor(size);
351 if (size <= KMEM_ZMAX) {
352 if (size & KMEM_ZMASK)
353 size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
354 indx = kmemsize[size >> KMEM_ZSHIFT];
355 zone = kmemzones[indx].kz_zone;
357 #ifdef MALLOC_PROFILE
358 krequests[size >> KMEM_ZSHIFT]++;
360 va = uma_zalloc(zone, flags);
363 malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
365 size = roundup(size, PAGE_SIZE);
368 va = uma_large_malloc(size, flags);
369 malloc_type_allocated(mtp, va == NULL ? 0 : size);
371 if (flags & M_WAITOK)
372 KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
374 t_malloc_fail = time_uptime;
376 if (va != NULL && !(flags & M_ZERO)) {
377 memset(va, 0x70, osize);
382 va = redzone_setup(va, osize);
384 return ((void *) va);
390 * Free a block of memory allocated by malloc.
392 * This routine may not block.
395 free(void *addr, struct malloc_type *mtp)
400 /* free(NULL, ...) does nothing */
404 #ifdef DEBUG_MEMGUARD
405 if (memguard_cmp(mtp)) {
413 addr = redzone_addr_ntor(addr);
418 slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
421 panic("free: address %p(%p) has not been allocated.\n",
422 addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
425 if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
427 struct malloc_type **mtpp = addr;
429 size = slab->us_keg->uk_size;
432 * Cache a pointer to the malloc_type that most recently freed
433 * this memory here. This way we know who is most likely to
434 * have stepped on it later.
436 * This code assumes that size is a multiple of 8 bytes for
439 mtpp = (struct malloc_type **)
440 ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
441 mtpp += (size - sizeof(struct malloc_type *)) /
442 sizeof(struct malloc_type *);
445 uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
447 size = slab->us_size;
448 uma_large_free(slab);
450 malloc_type_freed(mtp, size);
454 * realloc: change the size of a memory block
457 realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
463 /* realloc(NULL, ...) is equivalent to malloc(...) */
465 return (malloc(size, mtp, flags));
468 * XXX: Should report free of old memory and alloc of new memory to
472 #ifdef DEBUG_MEMGUARD
473 if (memguard_cmp(mtp)) {
481 alloc = redzone_get_size(addr);
483 slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
486 KASSERT(slab != NULL,
487 ("realloc: address %p out of range", (void *)addr));
489 /* Get the size of the original block */
490 if (!(slab->us_flags & UMA_SLAB_MALLOC))
491 alloc = slab->us_keg->uk_size;
493 alloc = slab->us_size;
495 /* Reuse the original block if appropriate */
497 && (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
499 #endif /* !DEBUG_REDZONE */
501 #ifdef DEBUG_MEMGUARD
505 /* Allocate a new, bigger (or smaller) block */
506 if ((newaddr = malloc(size, mtp, flags)) == NULL)
509 /* Copy over original contents */
510 bcopy(addr, newaddr, min(size, alloc));
516 * reallocf: same as realloc() but free memory on failure.
519 reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
523 if ((mem = realloc(addr, size, mtp, flags)) == NULL)
529 * Initialize the kernel memory allocator
533 kmeminit(void *dummy)
539 mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
542 * Try to auto-tune the kernel memory size, so that it is
543 * more applicable for a wider range of machine sizes.
544 * On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
545 * a VM_KMEM_SIZE of 12MB is a fair compromise. The
546 * VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
547 * available, and on an X86 with a total KVA space of 256MB,
548 * try to keep VM_KMEM_SIZE_MAX at 80MB or below.
550 * Note that the kmem_map is also used by the zone allocator,
551 * so make sure that there is enough space.
553 vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
554 mem_size = VMCNT_GET(page_count);
556 #if defined(VM_KMEM_SIZE_SCALE)
557 vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
559 TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
560 if (vm_kmem_size_scale > 0 &&
561 (mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
562 vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
564 #if defined(VM_KMEM_SIZE_MIN)
565 vm_kmem_size_min = VM_KMEM_SIZE_MIN;
567 TUNABLE_INT_FETCH("vm.kmem_size_min", &vm_kmem_size_min);
568 if (vm_kmem_size_min > 0 && vm_kmem_size < vm_kmem_size_min) {
569 vm_kmem_size = vm_kmem_size_min;
572 #if defined(VM_KMEM_SIZE_MAX)
573 vm_kmem_size_max = VM_KMEM_SIZE_MAX;
575 TUNABLE_INT_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
576 if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
577 vm_kmem_size = vm_kmem_size_max;
579 /* Allow final override from the kernel environment */
581 if (TUNABLE_INT_FETCH("kern.vm.kmem.size", &vm_kmem_size) != 0)
582 printf("kern.vm.kmem.size is now called vm.kmem_size!\n");
584 TUNABLE_INT_FETCH("vm.kmem_size", &vm_kmem_size);
587 * Limit kmem virtual size to twice the physical memory.
588 * This allows for kmem map sparseness, but limits the size
589 * to something sane. Be careful to not overflow the 32bit
590 * ints while doing the check.
592 if (((vm_kmem_size / 2) / PAGE_SIZE) > VMCNT_GET(page_count))
593 vm_kmem_size = 2 * VMCNT_GET(page_count) * PAGE_SIZE;
596 * Tune settings based on the kernel map's size at this time.
598 init_param3(vm_kmem_size / PAGE_SIZE);
600 kmem_map = kmem_suballoc(kernel_map, (vm_offset_t *)&kmembase,
601 (vm_offset_t *)&kmemlimit, vm_kmem_size);
602 kmem_map->system_map = 1;
604 #ifdef DEBUG_MEMGUARD
606 * Initialize MemGuard if support compiled in. MemGuard is a
607 * replacement allocator used for detecting tamper-after-free
608 * scenarios as they occur. It is only used for debugging.
610 vm_memguard_divisor = 10;
611 TUNABLE_INT_FETCH("vm.memguard.divisor", &vm_memguard_divisor);
613 /* Pick a conservative value if provided value sucks. */
614 if ((vm_memguard_divisor <= 0) ||
615 ((vm_kmem_size / vm_memguard_divisor) == 0))
616 vm_memguard_divisor = 10;
617 memguard_init(kmem_map, vm_kmem_size / vm_memguard_divisor);
622 mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
624 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
626 NULL, NULL, NULL, NULL,
628 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
629 for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
630 int size = kmemzones[indx].kz_size;
631 char *name = kmemzones[indx].kz_name;
633 kmemzones[indx].kz_zone = uma_zcreate(name, size,
635 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
637 NULL, NULL, NULL, NULL,
639 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
641 for (;i <= size; i+= KMEM_ZBASE)
642 kmemsize[i >> KMEM_ZSHIFT] = indx;
648 malloc_init(void *data)
650 struct malloc_type_internal *mtip;
651 struct malloc_type *mtp;
653 KASSERT(VMCNT_GET(page_count) != 0,
654 ("malloc_register before vm_init"));
657 mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
658 mtp->ks_handle = mtip;
660 mtx_lock(&malloc_mtx);
661 mtp->ks_next = kmemstatistics;
662 kmemstatistics = mtp;
664 mtx_unlock(&malloc_mtx);
668 malloc_uninit(void *data)
670 struct malloc_type_internal *mtip;
671 struct malloc_type_stats *mtsp;
672 struct malloc_type *mtp, *temp;
674 long temp_allocs, temp_bytes;
678 KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
679 mtx_lock(&malloc_mtx);
680 mtip = mtp->ks_handle;
681 mtp->ks_handle = NULL;
682 if (mtp != kmemstatistics) {
683 for (temp = kmemstatistics; temp != NULL;
684 temp = temp->ks_next) {
685 if (temp->ks_next == mtp)
686 temp->ks_next = mtp->ks_next;
689 kmemstatistics = mtp->ks_next;
691 mtx_unlock(&malloc_mtx);
694 * Look for memory leaks.
696 temp_allocs = temp_bytes = 0;
697 for (i = 0; i < MAXCPU; i++) {
698 mtsp = &mtip->mti_stats[i];
699 temp_allocs += mtsp->mts_numallocs;
700 temp_allocs -= mtsp->mts_numfrees;
701 temp_bytes += mtsp->mts_memalloced;
702 temp_bytes -= mtsp->mts_memfreed;
704 if (temp_allocs > 0 || temp_bytes > 0) {
705 printf("Warning: memory type %s leaked memory on destroy "
706 "(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
707 temp_allocs, temp_bytes);
710 slab = vtoslab((vm_offset_t) mtip & (~UMA_SLAB_MASK));
711 uma_zfree_arg(mt_zone, mtip, slab);
715 malloc_desc2type(const char *desc)
717 struct malloc_type *mtp;
719 mtx_assert(&malloc_mtx, MA_OWNED);
720 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
721 if (strcmp(mtp->ks_shortdesc, desc) == 0)
728 sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
730 struct malloc_type_stream_header mtsh;
731 struct malloc_type_internal *mtip;
732 struct malloc_type_header mth;
733 struct malloc_type *mtp;
734 int buflen, count, error, i;
738 mtx_lock(&malloc_mtx);
740 mtx_assert(&malloc_mtx, MA_OWNED);
742 mtx_unlock(&malloc_mtx);
743 buflen = sizeof(mtsh) + count * (sizeof(mth) +
744 sizeof(struct malloc_type_stats) * MAXCPU) + 1;
745 buffer = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
746 mtx_lock(&malloc_mtx);
747 if (count < kmemcount) {
748 free(buffer, M_TEMP);
752 sbuf_new(&sbuf, buffer, buflen, SBUF_FIXEDLEN);
755 * Insert stream header.
757 bzero(&mtsh, sizeof(mtsh));
758 mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
759 mtsh.mtsh_maxcpus = MAXCPU;
760 mtsh.mtsh_count = kmemcount;
761 if (sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh)) < 0) {
762 mtx_unlock(&malloc_mtx);
768 * Insert alternating sequence of type headers and type statistics.
770 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
771 mtip = (struct malloc_type_internal *)mtp->ks_handle;
774 * Insert type header.
776 bzero(&mth, sizeof(mth));
777 strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
778 if (sbuf_bcat(&sbuf, &mth, sizeof(mth)) < 0) {
779 mtx_unlock(&malloc_mtx);
785 * Insert type statistics for each CPU.
787 for (i = 0; i < MAXCPU; i++) {
788 if (sbuf_bcat(&sbuf, &mtip->mti_stats[i],
789 sizeof(mtip->mti_stats[i])) < 0) {
790 mtx_unlock(&malloc_mtx);
796 mtx_unlock(&malloc_mtx);
798 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
801 free(buffer, M_TEMP);
805 SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
806 0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
807 "Return malloc types");
809 SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
810 "Count of kernel malloc types");
813 DB_SHOW_COMMAND(malloc, db_show_malloc)
815 struct malloc_type_internal *mtip;
816 struct malloc_type *mtp;
817 u_int64_t allocs, frees;
818 u_int64_t alloced, freed;
821 db_printf("%18s %12s %12s %12s\n", "Type", "InUse", "MemUse",
823 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
824 mtip = (struct malloc_type_internal *)mtp->ks_handle;
829 for (i = 0; i < MAXCPU; i++) {
830 allocs += mtip->mti_stats[i].mts_numallocs;
831 frees += mtip->mti_stats[i].mts_numfrees;
832 alloced += mtip->mti_stats[i].mts_memalloced;
833 freed += mtip->mti_stats[i].mts_memfreed;
835 db_printf("%18s %12ju %12juK %12ju\n",
836 mtp->ks_shortdesc, allocs - frees,
837 (alloced - freed + 1023) / 1024, allocs);
842 #ifdef MALLOC_PROFILE
845 sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
859 bufsize = linesize * (KMEM_ZSIZE + 1);
860 bufsize += 128; /* For the stats line */
861 bufsize += 128; /* For the banner line */
865 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
866 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
868 "\n Size Requests Real Size\n");
869 for (i = 0; i < KMEM_ZSIZE; i++) {
870 size = i << KMEM_ZSHIFT;
871 rsize = kmemzones[kmemsize[i]].kz_size;
872 count = (long long unsigned)krequests[i];
874 sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
875 (unsigned long long)count, rsize);
877 if ((rsize * count) > (size * count))
878 waste += (rsize * count) - (size * count);
879 mem += (rsize * count);
882 "\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
883 (unsigned long long)mem, (unsigned long long)waste);
886 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
893 SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
894 NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
895 #endif /* MALLOC_PROFILE */