1 /*-
2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2005 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 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/6.3/sys/kern/kern_malloc.c 173886 2007-11-24 19:45:58Z cvs2svn $");
36
37 #include "opt_ddb.h"
38 #include "opt_vm.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kdb.h>
43 #include <sys/kernel.h>
44 #include <sys/lock.h>
45 #include <sys/malloc.h>
46 #include <sys/mbuf.h>
47 #include <sys/mutex.h>
48 #include <sys/vmmeter.h>
49 #include <sys/proc.h>
50 #include <sys/sbuf.h>
51 #include <sys/sysctl.h>
52 #include <sys/time.h>
53
54 #include <vm/vm.h>
55 #include <vm/pmap.h>
56 #include <vm/vm_param.h>
57 #include <vm/vm_kern.h>
58 #include <vm/vm_extern.h>
59 #include <vm/vm_map.h>
60 #include <vm/vm_page.h>
61 #include <vm/uma.h>
62 #include <vm/uma_int.h>
63 #include <vm/uma_dbg.h>
64
65 #ifdef DEBUG_MEMGUARD
66 #include <vm/memguard.h>
67 #endif
68
69 #if defined(INVARIANTS) && defined(__i386__)
70 #include <machine/cpu.h>
71 #endif
72
73 #include <ddb/ddb.h>
74
75 /*
76 * When realloc() is called, if the new size is sufficiently smaller than
77 * the old size, realloc() will allocate a new, smaller block to avoid
78 * wasting memory. 'Sufficiently smaller' is defined as: newsize <=
79 * oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
80 */
81 #ifndef REALLOC_FRACTION
82 #define REALLOC_FRACTION 1 /* new block if <= half the size */
83 #endif
84
85 MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
86 MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
87 MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
88
89 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
90 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
91
92 static void kmeminit(void *);
93 SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL)
94
95 static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
96
97 static struct malloc_type *kmemstatistics;
98 static char *kmembase;
99 static char *kmemlimit;
100 static int kmemcount;
101
102 #define KMEM_ZSHIFT 4
103 #define KMEM_ZBASE 16
104 #define KMEM_ZMASK (KMEM_ZBASE - 1)
105
106 #define KMEM_ZMAX PAGE_SIZE
107 #define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
108 static u_int8_t kmemsize[KMEM_ZSIZE + 1];
109
110 /* These won't be powers of two for long */
111 struct {
112 int kz_size;
113 char *kz_name;
114 uma_zone_t kz_zone;
115 } kmemzones[] = {
116 {16, "16", NULL},
117 {32, "32", NULL},
118 {64, "64", NULL},
119 {128, "128", NULL},
120 {256, "256", NULL},
121 {512, "512", NULL},
122 {1024, "1024", NULL},
123 {2048, "2048", NULL},
124 {4096, "4096", NULL},
125 #if PAGE_SIZE > 4096
126 {8192, "8192", NULL},
127 #if PAGE_SIZE > 8192
128 {16384, "16384", NULL},
129 #if PAGE_SIZE > 16384
130 {32768, "32768", NULL},
131 #if PAGE_SIZE > 32768
132 {65536, "65536", NULL},
133 #if PAGE_SIZE > 65536
134 #error "Unsupported PAGE_SIZE"
135 #endif /* 65536 */
136 #endif /* 32768 */
137 #endif /* 16384 */
138 #endif /* 8192 */
139 #endif /* 4096 */
140 {0, NULL},
141 };
142
143 static uma_zone_t mt_zone;
144
145 #ifdef DEBUG_MEMGUARD
146 u_int vm_memguard_divisor;
147 SYSCTL_UINT(_vm, OID_AUTO, memguard_divisor, CTLFLAG_RD, &vm_memguard_divisor,
148 0, "(kmem_size/memguard_divisor) == memguard submap size");
149 #endif
150
151 u_int vm_kmem_size;
152 SYSCTL_UINT(_vm, OID_AUTO, kmem_size, CTLFLAG_RD, &vm_kmem_size, 0,
153 "Size of kernel memory");
154
155 u_int vm_kmem_size_max;
156 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RD, &vm_kmem_size_max, 0,
157 "Maximum size of kernel memory");
158
159 u_int vm_kmem_size_scale;
160 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RD, &vm_kmem_size_scale, 0,
161 "Scale factor for kernel memory size");
162
163 /*
164 * The malloc_mtx protects the kmemstatistics linked list.
165 */
166
167 struct mtx malloc_mtx;
168
169 #ifdef MALLOC_PROFILE
170 uint64_t krequests[KMEM_ZSIZE + 1];
171
172 static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
173 #endif
174
175 static int sysctl_kern_malloc(SYSCTL_HANDLER_ARGS);
176 static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
177
178 /* time_uptime of last malloc(9) failure */
179 static time_t t_malloc_fail;
180
181 #ifdef MALLOC_MAKE_FAILURES
182 /*
183 * Causes malloc failures every (n) mallocs with M_NOWAIT. If set to 0,
184 * doesn't cause failures.
185 */
186 SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
187 "Kernel malloc debugging options");
188
189 static int malloc_failure_rate;
190 static int malloc_nowait_count;
191 static int malloc_failure_count;
192 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
193 &malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
194 TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
195 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
196 &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
197 #endif
198
199 int
200 malloc_last_fail(void)
201 {
202
203 return (time_uptime - t_malloc_fail);
204 }
205
206 /*
207 * Add this to the informational malloc_type bucket.
208 */
209 static void
210 malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
211 int zindx)
212 {
213 struct malloc_type_internal *mtip;
214 struct malloc_type_stats *mtsp;
215
216 critical_enter();
217 mtip = mtp->ks_handle;
218 mtsp = &mtip->mti_stats[curcpu];
219 if (size > 0) {
220 mtsp->mts_memalloced += size;
221 mtsp->mts_numallocs++;
222 }
223 if (zindx != -1)
224 mtsp->mts_size |= 1 << zindx;
225 critical_exit();
226 }
227
228 void
229 malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
230 {
231
232 if (size > 0)
233 malloc_type_zone_allocated(mtp, size, -1);
234 }
235
236 /*
237 * Remove this allocation from the informational malloc_type bucket.
238 */
239 void
240 malloc_type_freed(struct malloc_type *mtp, unsigned long size)
241 {
242 struct malloc_type_internal *mtip;
243 struct malloc_type_stats *mtsp;
244
245 critical_enter();
246 mtip = mtp->ks_handle;
247 mtsp = &mtip->mti_stats[curcpu];
248 mtsp->mts_memfreed += size;
249 mtsp->mts_numfrees++;
250 critical_exit();
251 }
252
253 /*
254 * malloc:
255 *
256 * Allocate a block of memory.
257 *
258 * If M_NOWAIT is set, this routine will not block and return NULL if
259 * the allocation fails.
260 */
261 void *
262 malloc(unsigned long size, struct malloc_type *mtp, int flags)
263 {
264 int indx;
265 caddr_t va;
266 uma_zone_t zone;
267 uma_keg_t keg;
268 #ifdef DIAGNOSTIC
269 unsigned long osize = size;
270 #endif
271
272 #ifdef INVARIANTS
273 /*
274 * Check that exactly one of M_WAITOK or M_NOWAIT is specified.
275 */
276 indx = flags & (M_WAITOK | M_NOWAIT);
277 if (indx != M_NOWAIT && indx != M_WAITOK) {
278 static struct timeval lasterr;
279 static int curerr, once;
280 if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
281 printf("Bad malloc flags: %x\n", indx);
282 kdb_backtrace();
283 flags |= M_WAITOK;
284 once++;
285 }
286 }
287 #endif
288 #if 0
289 if (size == 0)
290 kdb_enter("zero size malloc");
291 #endif
292 #ifdef MALLOC_MAKE_FAILURES
293 if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
294 atomic_add_int(&malloc_nowait_count, 1);
295 if ((malloc_nowait_count % malloc_failure_rate) == 0) {
296 atomic_add_int(&malloc_failure_count, 1);
297 t_malloc_fail = time_uptime;
298 return (NULL);
299 }
300 }
301 #endif
302 if (flags & M_WAITOK)
303 KASSERT(curthread->td_intr_nesting_level == 0,
304 ("malloc(M_WAITOK) in interrupt context"));
305
306 #ifdef DEBUG_MEMGUARD
307 /* XXX CHANGEME! */
308 if (mtp == M_SUBPROC)
309 return memguard_alloc(size, flags);
310 #endif
311
312 if (size <= KMEM_ZMAX) {
313 if (size & KMEM_ZMASK)
314 size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
315 indx = kmemsize[size >> KMEM_ZSHIFT];
316 zone = kmemzones[indx].kz_zone;
317 keg = zone->uz_keg;
318 #ifdef MALLOC_PROFILE
319 krequests[size >> KMEM_ZSHIFT]++;
320 #endif
321 va = uma_zalloc(zone, flags);
322 if (va != NULL)
323 size = keg->uk_size;
324 malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
325 } else {
326 size = roundup(size, PAGE_SIZE);
327 zone = NULL;
328 keg = NULL;
329 va = uma_large_malloc(size, flags);
330 malloc_type_allocated(mtp, va == NULL ? 0 : size);
331 }
332 if (flags & M_WAITOK)
333 KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
334 else if (va == NULL)
335 t_malloc_fail = time_uptime;
336 #ifdef DIAGNOSTIC
337 if (va != NULL && !(flags & M_ZERO)) {
338 memset(va, 0x70, osize);
339 }
340 #endif
341 return ((void *) va);
342 }
343
344 /*
345 * free:
346 *
347 * Free a block of memory allocated by malloc.
348 *
349 * This routine may not block.
350 */
351 void
352 free(void *addr, struct malloc_type *mtp)
353 {
354 uma_slab_t slab;
355 u_long size;
356
357 /* free(NULL, ...) does nothing */
358 if (addr == NULL)
359 return;
360
361 #ifdef DEBUG_MEMGUARD
362 /* XXX CHANGEME! */
363 if (mtp == M_SUBPROC) {
364 memguard_free(addr);
365 return;
366 }
367 #endif
368
369 size = 0;
370
371 slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
372
373 if (slab == NULL)
374 panic("free: address %p(%p) has not been allocated.\n",
375 addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
376
377
378 if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
379 #ifdef INVARIANTS
380 struct malloc_type **mtpp = addr;
381 #endif
382 size = slab->us_keg->uk_size;
383 #ifdef INVARIANTS
384 /*
385 * Cache a pointer to the malloc_type that most recently freed
386 * this memory here. This way we know who is most likely to
387 * have stepped on it later.
388 *
389 * This code assumes that size is a multiple of 8 bytes for
390 * 64 bit machines
391 */
392 mtpp = (struct malloc_type **)
393 ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
394 mtpp += (size - sizeof(struct malloc_type *)) /
395 sizeof(struct malloc_type *);
396 *mtpp = mtp;
397 #endif
398 uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
399 } else {
400 size = slab->us_size;
401 uma_large_free(slab);
402 }
403 malloc_type_freed(mtp, size);
404 }
405
406 /*
407 * realloc: change the size of a memory block
408 */
409 void *
410 realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
411 {
412 uma_slab_t slab;
413 unsigned long alloc;
414 void *newaddr;
415
416 /* realloc(NULL, ...) is equivalent to malloc(...) */
417 if (addr == NULL)
418 return (malloc(size, mtp, flags));
419
420 /*
421 * XXX: Should report free of old memory and alloc of new memory to
422 * per-CPU stats.
423 */
424
425 #ifdef DEBUG_MEMGUARD
426 /* XXX: CHANGEME! */
427 if (mtp == M_SUBPROC) {
428 slab = NULL;
429 alloc = size;
430 } else {
431 #endif
432
433 slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
434
435 /* Sanity check */
436 KASSERT(slab != NULL,
437 ("realloc: address %p out of range", (void *)addr));
438
439 /* Get the size of the original block */
440 if (!(slab->us_flags & UMA_SLAB_MALLOC))
441 alloc = slab->us_keg->uk_size;
442 else
443 alloc = slab->us_size;
444
445 /* Reuse the original block if appropriate */
446 if (size <= alloc
447 && (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
448 return (addr);
449
450 #ifdef DEBUG_MEMGUARD
451 }
452 #endif
453
454 /* Allocate a new, bigger (or smaller) block */
455 if ((newaddr = malloc(size, mtp, flags)) == NULL)
456 return (NULL);
457
458 /* Copy over original contents */
459 bcopy(addr, newaddr, min(size, alloc));
460 free(addr, mtp);
461 return (newaddr);
462 }
463
464 /*
465 * reallocf: same as realloc() but free memory on failure.
466 */
467 void *
468 reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
469 {
470 void *mem;
471
472 if ((mem = realloc(addr, size, mtp, flags)) == NULL)
473 free(addr, mtp);
474 return (mem);
475 }
476
477 /*
478 * Initialize the kernel memory allocator
479 */
480 /* ARGSUSED*/
481 static void
482 kmeminit(void *dummy)
483 {
484 u_int8_t indx;
485 u_long mem_size;
486 int i;
487
488 mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
489
490 /*
491 * Try to auto-tune the kernel memory size, so that it is
492 * more applicable for a wider range of machine sizes.
493 * On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
494 * a VM_KMEM_SIZE of 12MB is a fair compromise. The
495 * VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
496 * available, and on an X86 with a total KVA space of 256MB,
497 * try to keep VM_KMEM_SIZE_MAX at 80MB or below.
498 *
499 * Note that the kmem_map is also used by the zone allocator,
500 * so make sure that there is enough space.
501 */
502 vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
503 mem_size = cnt.v_page_count;
504
505 #if defined(VM_KMEM_SIZE_SCALE)
506 vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
507 #endif
508 TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
509 if (vm_kmem_size_scale > 0 &&
510 (mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
511 vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
512
513 #if defined(VM_KMEM_SIZE_MAX)
514 vm_kmem_size_max = VM_KMEM_SIZE_MAX;
515 #endif
516 TUNABLE_INT_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
517 if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
518 vm_kmem_size = vm_kmem_size_max;
519
520 /* Allow final override from the kernel environment */
521 #ifndef BURN_BRIDGES
522 if (TUNABLE_INT_FETCH("kern.vm.kmem.size", &vm_kmem_size) != 0)
523 printf("kern.vm.kmem.size is now called vm.kmem_size!\n");
524 #endif
525 TUNABLE_INT_FETCH("vm.kmem_size", &vm_kmem_size);
526
527 /*
528 * Limit kmem virtual size to twice the physical memory.
529 * This allows for kmem map sparseness, but limits the size
530 * to something sane. Be careful to not overflow the 32bit
531 * ints while doing the check.
532 */
533 if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count)
534 vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE;
535
536 /*
537 * Tune settings based on the kernel map's size at this time.
538 */
539 init_param3(vm_kmem_size / PAGE_SIZE);
540
541 kmem_map = kmem_suballoc(kernel_map, (vm_offset_t *)&kmembase,
542 (vm_offset_t *)&kmemlimit, vm_kmem_size);
543 kmem_map->system_map = 1;
544
545 #ifdef DEBUG_MEMGUARD
546 /*
547 * Initialize MemGuard if support compiled in. MemGuard is a
548 * replacement allocator used for detecting tamper-after-free
549 * scenarios as they occur. It is only used for debugging.
550 */
551 vm_memguard_divisor = 10;
552 TUNABLE_INT_FETCH("vm.memguard_divisor", &vm_memguard_divisor);
553
554 /* Pick a conservative value if provided value sucks. */
555 if ((vm_memguard_divisor <= 0) ||
556 ((vm_kmem_size / vm_memguard_divisor) == 0))
557 vm_memguard_divisor = 10;
558 memguard_init(kmem_map, vm_kmem_size / vm_memguard_divisor);
559 #endif
560
561 uma_startup2();
562
563 mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
564 #ifdef INVARIANTS
565 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
566 #else
567 NULL, NULL, NULL, NULL,
568 #endif
569 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
570 for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
571 int size = kmemzones[indx].kz_size;
572 char *name = kmemzones[indx].kz_name;
573
574 kmemzones[indx].kz_zone = uma_zcreate(name, size,
575 #ifdef INVARIANTS
576 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
577 #else
578 NULL, NULL, NULL, NULL,
579 #endif
580 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
581
582 for (;i <= size; i+= KMEM_ZBASE)
583 kmemsize[i >> KMEM_ZSHIFT] = indx;
584
585 }
586 }
587
588 void
589 malloc_init(void *data)
590 {
591 struct malloc_type_internal *mtip;
592 struct malloc_type *mtp;
593
594 KASSERT(cnt.v_page_count != 0, ("malloc_register before vm_init"));
595
596 mtp = data;
597 mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
598 mtp->ks_handle = mtip;
599
600 mtx_lock(&malloc_mtx);
601 mtp->ks_next = kmemstatistics;
602 kmemstatistics = mtp;
603 kmemcount++;
604 mtx_unlock(&malloc_mtx);
605 }
606
607 void
608 malloc_uninit(void *data)
609 {
610 struct malloc_type_internal *mtip;
611 struct malloc_type_stats *mtsp;
612 struct malloc_type *mtp, *temp;
613 uma_slab_t slab;
614 long temp_allocs, temp_bytes;
615 int i;
616
617 mtp = data;
618 KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
619 mtx_lock(&malloc_mtx);
620 mtip = mtp->ks_handle;
621 mtp->ks_handle = NULL;
622 if (mtp != kmemstatistics) {
623 for (temp = kmemstatistics; temp != NULL;
624 temp = temp->ks_next) {
625 if (temp->ks_next == mtp)
626 temp->ks_next = mtp->ks_next;
627 }
628 } else
629 kmemstatistics = mtp->ks_next;
630 kmemcount--;
631 mtx_unlock(&malloc_mtx);
632
633 /*
634 * Look for memory leaks.
635 */
636 temp_allocs = temp_bytes = 0;
637 for (i = 0; i < MAXCPU; i++) {
638 mtsp = &mtip->mti_stats[i];
639 temp_allocs += mtsp->mts_numallocs;
640 temp_allocs -= mtsp->mts_numfrees;
641 temp_bytes += mtsp->mts_memalloced;
642 temp_bytes -= mtsp->mts_memfreed;
643 }
644 if (temp_allocs > 0 || temp_bytes > 0) {
645 printf("Warning: memory type %s leaked memory on destroy "
646 "(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
647 temp_allocs, temp_bytes);
648 }
649
650 slab = vtoslab((vm_offset_t) mtip & (~UMA_SLAB_MASK));
651 uma_zfree_arg(mt_zone, mtip, slab);
652 }
653
654 static int
655 sysctl_kern_malloc(SYSCTL_HANDLER_ARGS)
656 {
657 struct malloc_type_stats mts_local, *mtsp;
658 struct malloc_type_internal *mtip;
659 struct malloc_type *mtp;
660 struct sbuf sbuf;
661 long temp_allocs, temp_bytes;
662 int linesize = 128;
663 int bufsize;
664 int first;
665 int error;
666 char *buf;
667 int cnt;
668 int i;
669
670 cnt = 0;
671
672 /* Guess at how much room is needed. */
673 mtx_lock(&malloc_mtx);
674 cnt = kmemcount;
675 mtx_unlock(&malloc_mtx);
676
677 bufsize = linesize * (cnt + 1);
678 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
679 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
680
681 mtx_lock(&malloc_mtx);
682 sbuf_printf(&sbuf,
683 "\n Type InUse MemUse HighUse Requests Size(s)\n");
684 for (mtp = kmemstatistics; cnt != 0 && mtp != NULL;
685 mtp = mtp->ks_next, cnt--) {
686 mtip = mtp->ks_handle;
687 bzero(&mts_local, sizeof(mts_local));
688 for (i = 0; i < MAXCPU; i++) {
689 mtsp = &mtip->mti_stats[i];
690 mts_local.mts_memalloced += mtsp->mts_memalloced;
691 mts_local.mts_memfreed += mtsp->mts_memfreed;
692 mts_local.mts_numallocs += mtsp->mts_numallocs;
693 mts_local.mts_numfrees += mtsp->mts_numfrees;
694 mts_local.mts_size |= mtsp->mts_size;
695 }
696 if (mts_local.mts_numallocs == 0)
697 continue;
698
699 /*
700 * Due to races in per-CPU statistics gather, it's possible to
701 * get a slightly negative number here. If we do, approximate
702 * with 0.
703 */
704 if (mts_local.mts_numallocs > mts_local.mts_numfrees)
705 temp_allocs = mts_local.mts_numallocs -
706 mts_local.mts_numfrees;
707 else
708 temp_allocs = 0;
709
710 /*
711 * Ditto for bytes allocated.
712 */
713 if (mts_local.mts_memalloced > mts_local.mts_memfreed)
714 temp_bytes = mts_local.mts_memalloced -
715 mts_local.mts_memfreed;
716 else
717 temp_bytes = 0;
718
719 /*
720 * High-waterwark is no longer easily available, so we just
721 * print '-' for that column.
722 */
723 sbuf_printf(&sbuf, "%13s%6lu%6luK -%9llu",
724 mtp->ks_shortdesc,
725 temp_allocs,
726 (temp_bytes + 1023) / 1024,
727 (unsigned long long)mts_local.mts_numallocs);
728
729 first = 1;
730 for (i = 0; i < sizeof(kmemzones) / sizeof(kmemzones[0]) - 1;
731 i++) {
732 if (mts_local.mts_size & (1 << i)) {
733 if (first)
734 sbuf_printf(&sbuf, " ");
735 else
736 sbuf_printf(&sbuf, ",");
737 sbuf_printf(&sbuf, "%s",
738 kmemzones[i].kz_name);
739 first = 0;
740 }
741 }
742 sbuf_printf(&sbuf, "\n");
743 }
744 sbuf_finish(&sbuf);
745 mtx_unlock(&malloc_mtx);
746
747 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
748
749 sbuf_delete(&sbuf);
750 free(buf, M_TEMP);
751 return (error);
752 }
753
754 SYSCTL_OID(_kern, OID_AUTO, malloc, CTLTYPE_STRING|CTLFLAG_RD,
755 NULL, 0, sysctl_kern_malloc, "A", "Malloc Stats");
756
757 static int
758 sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
759 {
760 struct malloc_type_stream_header mtsh;
761 struct malloc_type_internal *mtip;
762 struct malloc_type_header mth;
763 struct malloc_type *mtp;
764 int buflen, count, error, i;
765 struct sbuf sbuf;
766 char *buffer;
767
768 mtx_lock(&malloc_mtx);
769 restart:
770 mtx_assert(&malloc_mtx, MA_OWNED);
771 count = kmemcount;
772 mtx_unlock(&malloc_mtx);
773 buflen = sizeof(mtsh) + count * (sizeof(mth) +
774 sizeof(struct malloc_type_stats) * MAXCPU) + 1;
775 buffer = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
776 mtx_lock(&malloc_mtx);
777 if (count < kmemcount) {
778 free(buffer, M_TEMP);
779 goto restart;
780 }
781
782 sbuf_new(&sbuf, buffer, buflen, SBUF_FIXEDLEN);
783
784 /*
785 * Insert stream header.
786 */
787 bzero(&mtsh, sizeof(mtsh));
788 mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
789 mtsh.mtsh_maxcpus = MAXCPU;
790 mtsh.mtsh_count = kmemcount;
791 if (sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh)) < 0) {
792 mtx_unlock(&malloc_mtx);
793 error = ENOMEM;
794 goto out;
795 }
796
797 /*
798 * Insert alternating sequence of type headers and type statistics.
799 */
800 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
801 mtip = (struct malloc_type_internal *)mtp->ks_handle;
802
803 /*
804 * Insert type header.
805 */
806 bzero(&mth, sizeof(mth));
807 strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
808 if (sbuf_bcat(&sbuf, &mth, sizeof(mth)) < 0) {
809 mtx_unlock(&malloc_mtx);
810 error = ENOMEM;
811 goto out;
812 }
813
814 /*
815 * Insert type statistics for each CPU.
816 */
817 for (i = 0; i < MAXCPU; i++) {
818 if (sbuf_bcat(&sbuf, &mtip->mti_stats[i],
819 sizeof(mtip->mti_stats[i])) < 0) {
820 mtx_unlock(&malloc_mtx);
821 error = ENOMEM;
822 goto out;
823 }
824 }
825 }
826 mtx_unlock(&malloc_mtx);
827 sbuf_finish(&sbuf);
828 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
829 out:
830 sbuf_delete(&sbuf);
831 free(buffer, M_TEMP);
832 return (error);
833 }
834
835 SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
836 0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
837 "Return malloc types");
838
839 SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
840 "Count of kernel malloc types");
841
842 #ifdef DDB
843 DB_SHOW_COMMAND(malloc, db_show_malloc)
844 {
845 struct malloc_type_internal *mtip;
846 struct malloc_type *mtp;
847 u_int64_t allocs, frees;
848 int i;
849
850 db_printf("%18s %12s %12s %12s\n", "Type", "Allocs", "Frees",
851 "Used");
852 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
853 mtip = (struct malloc_type_internal *)mtp->ks_handle;
854 allocs = 0;
855 frees = 0;
856 for (i = 0; i < MAXCPU; i++) {
857 allocs += mtip->mti_stats[i].mts_numallocs;
858 frees += mtip->mti_stats[i].mts_numfrees;
859 }
860 db_printf("%18s %12ju %12ju %12ju\n", mtp->ks_shortdesc,
861 allocs, frees, allocs - frees);
862 }
863 }
864 #endif
865
866 #ifdef MALLOC_PROFILE
867
868 static int
869 sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
870 {
871 int linesize = 64;
872 struct sbuf sbuf;
873 uint64_t count;
874 uint64_t waste;
875 uint64_t mem;
876 int bufsize;
877 int error;
878 char *buf;
879 int rsize;
880 int size;
881 int i;
882
883 bufsize = linesize * (KMEM_ZSIZE + 1);
884 bufsize += 128; /* For the stats line */
885 bufsize += 128; /* For the banner line */
886 waste = 0;
887 mem = 0;
888
889 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
890 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
891 sbuf_printf(&sbuf,
892 "\n Size Requests Real Size\n");
893 for (i = 0; i < KMEM_ZSIZE; i++) {
894 size = i << KMEM_ZSHIFT;
895 rsize = kmemzones[kmemsize[i]].kz_size;
896 count = (long long unsigned)krequests[i];
897
898 sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
899 (unsigned long long)count, rsize);
900
901 if ((rsize * count) > (size * count))
902 waste += (rsize * count) - (size * count);
903 mem += (rsize * count);
904 }
905 sbuf_printf(&sbuf,
906 "\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
907 (unsigned long long)mem, (unsigned long long)waste);
908 sbuf_finish(&sbuf);
909
910 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
911
912 sbuf_delete(&sbuf);
913 free(buf, M_TEMP);
914 return (error);
915 }
916
917 SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
918 NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
919 #endif /* MALLOC_PROFILE */
Cache object: bd76c74a4fe2429b8881758470aa0956
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