2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2005 Robert N. M. Watson
7 * Redistribution and use in source and binary forms, with or without
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.
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.
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
31 * @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/kernel.h>
44 #include <sys/malloc.h>
46 #include <sys/mutex.h>
47 #include <sys/vmmeter.h>
50 #include <sys/sysctl.h>
55 #include <vm/vm_param.h>
56 #include <vm/vm_kern.h>
57 #include <vm/vm_extern.h>
58 #include <vm/vm_map.h>
59 #include <vm/vm_page.h>
61 #include <vm/uma_int.h>
62 #include <vm/uma_dbg.h>
65 #include <vm/memguard.h>
68 #if defined(INVARIANTS) && defined(__i386__)
69 #include <machine/cpu.h>
73 * When realloc() is called, if the new size is sufficiently smaller than
74 * the old size, realloc() will allocate a new, smaller block to avoid
75 * wasting memory. 'Sufficiently smaller' is defined as: newsize <=
76 * oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
78 #ifndef REALLOC_FRACTION
79 #define REALLOC_FRACTION 1 /* new block if <= half the size */
82 MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
83 MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
84 MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
86 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
87 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
89 static void kmeminit(void *);
90 SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL)
92 static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
94 static struct malloc_type *kmemstatistics;
95 static char *kmembase;
96 static char *kmemlimit;
100 #define KMEM_ZBASE 16
101 #define KMEM_ZMASK (KMEM_ZBASE - 1)
103 #define KMEM_ZMAX PAGE_SIZE
104 #define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
105 static u_int8_t kmemsize[KMEM_ZSIZE + 1];
107 /* These won't be powers of two for long */
119 {1024, "1024", NULL},
120 {2048, "2048", NULL},
121 {4096, "4096", NULL},
123 {8192, "8192", NULL},
125 {16384, "16384", NULL},
126 #if PAGE_SIZE > 16384
127 {32768, "32768", NULL},
128 #if PAGE_SIZE > 32768
129 {65536, "65536", NULL},
130 #if PAGE_SIZE > 65536
131 #error "Unsupported PAGE_SIZE"
140 static uma_zone_t mt_zone;
142 #ifdef DEBUG_MEMGUARD
143 u_int vm_memguard_divisor;
144 SYSCTL_UINT(_vm, OID_AUTO, memguard_divisor, CTLFLAG_RD, &vm_memguard_divisor,
145 0, "(kmem_size/memguard_divisor) == memguard submap size");
149 SYSCTL_UINT(_vm, OID_AUTO, kmem_size, CTLFLAG_RD, &vm_kmem_size, 0,
150 "Size of kernel memory");
152 u_int vm_kmem_size_max;
153 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RD, &vm_kmem_size_max, 0,
154 "Maximum size of kernel memory");
156 u_int vm_kmem_size_scale;
157 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RD, &vm_kmem_size_scale, 0,
158 "Scale factor for kernel memory size");
161 * The malloc_mtx protects the kmemstatistics linked list.
164 struct mtx malloc_mtx;
166 #ifdef MALLOC_PROFILE
167 uint64_t krequests[KMEM_ZSIZE + 1];
169 static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
172 static int sysctl_kern_malloc(SYSCTL_HANDLER_ARGS);
173 static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
175 /* time_uptime of last malloc(9) failure */
176 static time_t t_malloc_fail;
178 #ifdef MALLOC_MAKE_FAILURES
180 * Causes malloc failures every (n) mallocs with M_NOWAIT. If set to 0,
181 * doesn't cause failures.
183 SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
184 "Kernel malloc debugging options");
186 static int malloc_failure_rate;
187 static int malloc_nowait_count;
188 static int malloc_failure_count;
189 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
190 &malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
191 TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
192 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
193 &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
197 malloc_last_fail(void)
200 return (time_uptime - t_malloc_fail);
204 * Add this to the informational malloc_type bucket.
207 malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
210 struct malloc_type_internal *mtip;
211 struct malloc_type_stats *mtsp;
214 mtip = mtp->ks_handle;
215 mtsp = &mtip->mti_stats[curcpu];
217 mtsp->mts_memalloced += size;
218 mtsp->mts_numallocs++;
221 mtsp->mts_size |= 1 << zindx;
226 malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
230 malloc_type_zone_allocated(mtp, size, -1);
234 * Remove this allocation from the informational malloc_type bucket.
237 malloc_type_freed(struct malloc_type *mtp, unsigned long size)
239 struct malloc_type_internal *mtip;
240 struct malloc_type_stats *mtsp;
243 mtip = mtp->ks_handle;
244 mtsp = &mtip->mti_stats[curcpu];
245 mtsp->mts_memfreed += size;
246 mtsp->mts_numfrees++;
253 * Allocate a block of memory.
255 * If M_NOWAIT is set, this routine will not block and return NULL if
256 * the allocation fails.
259 malloc(unsigned long size, struct malloc_type *mtp, int flags)
266 unsigned long osize = size;
271 * Check that exactly one of M_WAITOK or M_NOWAIT is specified.
273 indx = flags & (M_WAITOK | M_NOWAIT);
274 if (indx != M_NOWAIT && indx != M_WAITOK) {
275 static struct timeval lasterr;
276 static int curerr, once;
277 if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
278 printf("Bad malloc flags: %x\n", indx);
287 kdb_enter("zero size malloc");
289 #ifdef MALLOC_MAKE_FAILURES
290 if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
291 atomic_add_int(&malloc_nowait_count, 1);
292 if ((malloc_nowait_count % malloc_failure_rate) == 0) {
293 atomic_add_int(&malloc_failure_count, 1);
294 t_malloc_fail = time_uptime;
299 if (flags & M_WAITOK)
300 KASSERT(curthread->td_intr_nesting_level == 0,
301 ("malloc(M_WAITOK) in interrupt context"));
303 #ifdef DEBUG_MEMGUARD
305 if (mtp == M_SUBPROC)
306 return memguard_alloc(size, flags);
309 if (size <= KMEM_ZMAX) {
310 if (size & KMEM_ZMASK)
311 size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
312 indx = kmemsize[size >> KMEM_ZSHIFT];
313 zone = kmemzones[indx].kz_zone;
315 #ifdef MALLOC_PROFILE
316 krequests[size >> KMEM_ZSHIFT]++;
318 va = uma_zalloc(zone, flags);
321 malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
323 size = roundup(size, PAGE_SIZE);
326 va = uma_large_malloc(size, flags);
327 malloc_type_allocated(mtp, va == NULL ? 0 : size);
329 if (flags & M_WAITOK)
330 KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
332 t_malloc_fail = time_uptime;
334 if (va != NULL && !(flags & M_ZERO)) {
335 memset(va, 0x70, osize);
338 return ((void *) va);
344 * Free a block of memory allocated by malloc.
346 * This routine may not block.
349 free(void *addr, struct malloc_type *mtp)
354 /* free(NULL, ...) does nothing */
358 #ifdef DEBUG_MEMGUARD
360 if (mtp == M_SUBPROC) {
368 slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
371 panic("free: address %p(%p) has not been allocated.\n",
372 addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
375 if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
377 struct malloc_type **mtpp = addr;
379 size = slab->us_keg->uk_size;
382 * Cache a pointer to the malloc_type that most recently freed
383 * this memory here. This way we know who is most likely to
384 * have stepped on it later.
386 * This code assumes that size is a multiple of 8 bytes for
389 mtpp = (struct malloc_type **)
390 ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
391 mtpp += (size - sizeof(struct malloc_type *)) /
392 sizeof(struct malloc_type *);
395 uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
397 size = slab->us_size;
398 uma_large_free(slab);
400 malloc_type_freed(mtp, size);
404 * realloc: change the size of a memory block
407 realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
413 /* realloc(NULL, ...) is equivalent to malloc(...) */
415 return (malloc(size, mtp, flags));
418 * XXX: Should report free of old memory and alloc of new memory to
422 #ifdef DEBUG_MEMGUARD
424 if (mtp == M_SUBPROC) {
430 slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
433 KASSERT(slab != NULL,
434 ("realloc: address %p out of range", (void *)addr));
436 /* Get the size of the original block */
438 alloc = slab->us_keg->uk_size;
440 alloc = slab->us_size;
442 /* Reuse the original block if appropriate */
444 && (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
447 #ifdef DEBUG_MEMGUARD
451 /* Allocate a new, bigger (or smaller) block */
452 if ((newaddr = malloc(size, mtp, flags)) == NULL)
455 /* Copy over original contents */
456 bcopy(addr, newaddr, min(size, alloc));
462 * reallocf: same as realloc() but free memory on failure.
465 reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
469 if ((mem = realloc(addr, size, mtp, flags)) == NULL)
475 * Initialize the kernel memory allocator
479 kmeminit(void *dummy)
485 mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
488 * Try to auto-tune the kernel memory size, so that it is
489 * more applicable for a wider range of machine sizes.
490 * On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
491 * a VM_KMEM_SIZE of 12MB is a fair compromise. The
492 * VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
493 * available, and on an X86 with a total KVA space of 256MB,
494 * try to keep VM_KMEM_SIZE_MAX at 80MB or below.
496 * Note that the kmem_map is also used by the zone allocator,
497 * so make sure that there is enough space.
499 vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
500 mem_size = cnt.v_page_count;
502 #if defined(VM_KMEM_SIZE_SCALE)
503 vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
505 TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
506 if (vm_kmem_size_scale > 0 &&
507 (mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
508 vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
510 #if defined(VM_KMEM_SIZE_MAX)
511 vm_kmem_size_max = VM_KMEM_SIZE_MAX;
513 TUNABLE_INT_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
514 if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
515 vm_kmem_size = vm_kmem_size_max;
517 /* Allow final override from the kernel environment */
519 if (TUNABLE_INT_FETCH("kern.vm.kmem.size", &vm_kmem_size) != 0)
520 printf("kern.vm.kmem.size is now called vm.kmem_size!\n");
522 TUNABLE_INT_FETCH("vm.kmem_size", &vm_kmem_size);
525 * Limit kmem virtual size to twice the physical memory.
526 * This allows for kmem map sparseness, but limits the size
527 * to something sane. Be careful to not overflow the 32bit
528 * ints while doing the check.
530 if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count)
531 vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE;
534 * Tune settings based on the kernel map's size at this time.
536 init_param3(vm_kmem_size / PAGE_SIZE);
538 kmem_map = kmem_suballoc(kernel_map, (vm_offset_t *)&kmembase,
539 (vm_offset_t *)&kmemlimit, vm_kmem_size);
540 kmem_map->system_map = 1;
542 #ifdef DEBUG_MEMGUARD
544 * Initialize MemGuard if support compiled in. MemGuard is a
545 * replacement allocator used for detecting tamper-after-free
546 * scenarios as they occur. It is only used for debugging.
548 vm_memguard_divisor = 10;
549 TUNABLE_INT_FETCH("vm.memguard_divisor", &vm_memguard_divisor);
551 /* Pick a conservative value if provided value sucks. */
552 if ((vm_memguard_divisor <= 0) ||
553 ((vm_kmem_size / vm_memguard_divisor) == 0))
554 vm_memguard_divisor = 10;
555 memguard_init(kmem_map, vm_kmem_size / vm_memguard_divisor);
560 mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
562 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
564 NULL, NULL, NULL, NULL,
566 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
567 for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
568 int size = kmemzones[indx].kz_size;
569 char *name = kmemzones[indx].kz_name;
571 kmemzones[indx].kz_zone = uma_zcreate(name, size,
573 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
575 NULL, NULL, NULL, NULL,
577 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
579 for (;i <= size; i+= KMEM_ZBASE)
580 kmemsize[i >> KMEM_ZSHIFT] = indx;
586 malloc_init(void *data)
588 struct malloc_type_internal *mtip;
589 struct malloc_type *mtp;
591 KASSERT(cnt.v_page_count != 0, ("malloc_register before vm_init"));
594 mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
595 mtp->ks_handle = mtip;
597 mtx_lock(&malloc_mtx);
598 mtp->ks_next = kmemstatistics;
599 kmemstatistics = mtp;
601 mtx_unlock(&malloc_mtx);
605 malloc_uninit(void *data)
607 struct malloc_type_internal *mtip;
608 struct malloc_type *mtp, *temp;
611 KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
612 mtx_lock(&malloc_mtx);
613 mtip = mtp->ks_handle;
614 mtp->ks_handle = NULL;
615 if (mtp != kmemstatistics) {
616 for (temp = kmemstatistics; temp != NULL;
617 temp = temp->ks_next) {
618 if (temp->ks_next == mtp)
619 temp->ks_next = mtp->ks_next;
622 kmemstatistics = mtp->ks_next;
624 mtx_unlock(&malloc_mtx);
625 uma_zfree(mt_zone, mtip);
629 sysctl_kern_malloc(SYSCTL_HANDLER_ARGS)
631 struct malloc_type_stats mts_local, *mtsp;
632 struct malloc_type_internal *mtip;
633 struct malloc_type *mtp;
635 long temp_allocs, temp_bytes;
646 /* Guess at how much room is needed. */
647 mtx_lock(&malloc_mtx);
649 mtx_unlock(&malloc_mtx);
651 bufsize = linesize * (cnt + 1);
652 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
653 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
655 mtx_lock(&malloc_mtx);
657 "\n Type InUse MemUse HighUse Requests Size(s)\n");
658 for (mtp = kmemstatistics; cnt != 0 && mtp != NULL;
659 mtp = mtp->ks_next, cnt--) {
660 mtip = mtp->ks_handle;
661 bzero(&mts_local, sizeof(mts_local));
662 for (i = 0; i < MAXCPU; i++) {
663 mtsp = &mtip->mti_stats[i];
664 mts_local.mts_memalloced += mtsp->mts_memalloced;
665 mts_local.mts_memfreed += mtsp->mts_memfreed;
666 mts_local.mts_numallocs += mtsp->mts_numallocs;
667 mts_local.mts_numfrees += mtsp->mts_numfrees;
668 mts_local.mts_size |= mtsp->mts_size;
670 if (mts_local.mts_numallocs == 0)
674 * Due to races in per-CPU statistics gather, it's possible to
675 * get a slightly negative number here. If we do, approximate
678 if (mts_local.mts_numallocs > mts_local.mts_numfrees)
679 temp_allocs = mts_local.mts_numallocs -
680 mts_local.mts_numfrees;
685 * Ditto for bytes allocated.
687 if (mts_local.mts_memalloced > mts_local.mts_memfreed)
688 temp_bytes = mts_local.mts_memalloced -
689 mts_local.mts_memfreed;
694 * High-waterwark is no longer easily available, so we just
695 * print '-' for that column.
697 sbuf_printf(&sbuf, "%13s%6lu%6luK -%9llu",
700 (temp_bytes + 1023) / 1024,
701 (unsigned long long)mts_local.mts_numallocs);
704 for (i = 0; i < sizeof(kmemzones) / sizeof(kmemzones[0]) - 1;
706 if (mts_local.mts_size & (1 << i)) {
708 sbuf_printf(&sbuf, " ");
710 sbuf_printf(&sbuf, ",");
711 sbuf_printf(&sbuf, "%s",
712 kmemzones[i].kz_name);
716 sbuf_printf(&sbuf, "\n");
719 mtx_unlock(&malloc_mtx);
721 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
728 SYSCTL_OID(_kern, OID_AUTO, malloc, CTLTYPE_STRING|CTLFLAG_RD,
729 NULL, 0, sysctl_kern_malloc, "A", "Malloc Stats");
732 sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
734 struct malloc_type_stream_header mtsh;
735 struct malloc_type_internal *mtip;
736 struct malloc_type_header mth;
737 struct malloc_type *mtp;
738 int buflen, count, error, i;
742 mtx_lock(&malloc_mtx);
744 mtx_assert(&malloc_mtx, MA_OWNED);
746 mtx_unlock(&malloc_mtx);
747 buflen = sizeof(mtsh) + count * (sizeof(mth) +
748 sizeof(struct malloc_type_stats) * MAXCPU) + 1;
749 buffer = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
750 mtx_lock(&malloc_mtx);
751 if (count < kmemcount) {
752 free(buffer, M_TEMP);
756 sbuf_new(&sbuf, buffer, buflen, SBUF_FIXEDLEN);
759 * Insert stream header.
761 bzero(&mtsh, sizeof(mtsh));
762 mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
763 mtsh.mtsh_maxcpus = MAXCPU;
764 mtsh.mtsh_count = kmemcount;
765 if (sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh)) < 0) {
766 mtx_unlock(&malloc_mtx);
772 * Insert alternating sequence of type headers and type statistics.
774 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
775 mtip = (struct malloc_type_internal *)mtp->ks_handle;
778 * Insert type header.
780 bzero(&mth, sizeof(mth));
781 strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
782 if (sbuf_bcat(&sbuf, &mth, sizeof(mth)) < 0) {
783 mtx_unlock(&malloc_mtx);
789 * Insert type statistics for each CPU.
791 for (i = 0; i < MAXCPU; i++) {
792 if (sbuf_bcat(&sbuf, &mtip->mti_stats[i],
793 sizeof(mtip->mti_stats[i])) < 0) {
794 mtx_unlock(&malloc_mtx);
800 mtx_unlock(&malloc_mtx);
802 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
805 free(buffer, M_TEMP);
809 SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
810 0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
811 "Return malloc types");
813 SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
814 "Count of kernel malloc types");
816 #ifdef MALLOC_PROFILE
819 sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
833 bufsize = linesize * (KMEM_ZSIZE + 1);
834 bufsize += 128; /* For the stats line */
835 bufsize += 128; /* For the banner line */
839 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
840 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
842 "\n Size Requests Real Size\n");
843 for (i = 0; i < KMEM_ZSIZE; i++) {
844 size = i << KMEM_ZSHIFT;
845 rsize = kmemzones[kmemsize[i]].kz_size;
846 count = (long long unsigned)krequests[i];
848 sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
849 (unsigned long long)count, rsize);
851 if ((rsize * count) > (size * count))
852 waste += (rsize * count) - (size * count);
853 mem += (rsize * count);
856 "\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
857 (unsigned long long)mem, (unsigned long long)waste);
860 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
867 SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
868 NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
869 #endif /* MALLOC_PROFILE */