2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * from: @(#)vm_object.c 8.5 (Berkeley) 3/22/94
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
42 * Permission to use, copy, modify and distribute this software and
43 * its documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
52 * Carnegie Mellon requests users of this software to return to
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
64 * Virtual memory object module.
67 #include <sys/cdefs.h>
68 __FBSDID("$FreeBSD$");
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/cpuset.h>
77 #include <sys/mount.h>
78 #include <sys/kernel.h>
79 #include <sys/pctrie.h>
80 #include <sys/sysctl.h>
81 #include <sys/mutex.h>
82 #include <sys/proc.h> /* for curproc, pageproc */
83 #include <sys/socket.h>
84 #include <sys/resourcevar.h>
85 #include <sys/rwlock.h>
87 #include <sys/vnode.h>
88 #include <sys/vmmeter.h>
92 #include <vm/vm_param.h>
94 #include <vm/vm_map.h>
95 #include <vm/vm_object.h>
96 #include <vm/vm_page.h>
97 #include <vm/vm_pageout.h>
98 #include <vm/vm_pager.h>
99 #include <vm/vm_phys.h>
100 #include <vm/vm_pagequeue.h>
101 #include <vm/swap_pager.h>
102 #include <vm/vm_kern.h>
103 #include <vm/vm_extern.h>
104 #include <vm/vm_radix.h>
105 #include <vm/vm_reserv.h>
108 static int old_msync;
109 SYSCTL_INT(_vm, OID_AUTO, old_msync, CTLFLAG_RW, &old_msync, 0,
110 "Use old (insecure) msync behavior");
112 static int vm_object_page_collect_flush(vm_object_t object, vm_page_t p,
113 int pagerflags, int flags, boolean_t *clearobjflags,
115 static boolean_t vm_object_page_remove_write(vm_page_t p, int flags,
116 boolean_t *clearobjflags);
117 static void vm_object_qcollapse(vm_object_t object);
118 static void vm_object_vndeallocate(vm_object_t object);
121 * Virtual memory objects maintain the actual data
122 * associated with allocated virtual memory. A given
123 * page of memory exists within exactly one object.
125 * An object is only deallocated when all "references"
126 * are given up. Only one "reference" to a given
127 * region of an object should be writeable.
129 * Associated with each object is a list of all resident
130 * memory pages belonging to that object; this list is
131 * maintained by the "vm_page" module, and locked by the object's
134 * Each object also records a "pager" routine which is
135 * used to retrieve (and store) pages to the proper backing
136 * storage. In addition, objects may be backed by other
137 * objects from which they were virtual-copied.
139 * The only items within the object structure which are
140 * modified after time of creation are:
141 * reference count locked by object's lock
142 * pager routine locked by object's lock
146 struct object_q vm_object_list;
147 struct mtx vm_object_list_mtx; /* lock for object list and count */
149 struct vm_object kernel_object_store;
151 static SYSCTL_NODE(_vm_stats, OID_AUTO, object, CTLFLAG_RD, 0,
154 static counter_u64_t object_collapses = EARLY_COUNTER;
155 SYSCTL_COUNTER_U64(_vm_stats_object, OID_AUTO, collapses, CTLFLAG_RD,
157 "VM object collapses");
159 static counter_u64_t object_bypasses = EARLY_COUNTER;
160 SYSCTL_COUNTER_U64(_vm_stats_object, OID_AUTO, bypasses, CTLFLAG_RD,
162 "VM object bypasses");
165 counter_startup(void)
168 object_collapses = counter_u64_alloc(M_WAITOK);
169 object_bypasses = counter_u64_alloc(M_WAITOK);
171 SYSINIT(object_counters, SI_SUB_CPU, SI_ORDER_ANY, counter_startup, NULL);
173 static uma_zone_t obj_zone;
175 static int vm_object_zinit(void *mem, int size, int flags);
178 static void vm_object_zdtor(void *mem, int size, void *arg);
181 vm_object_zdtor(void *mem, int size, void *arg)
185 object = (vm_object_t)mem;
186 KASSERT(object->ref_count == 0,
187 ("object %p ref_count = %d", object, object->ref_count));
188 KASSERT(TAILQ_EMPTY(&object->memq),
189 ("object %p has resident pages in its memq", object));
190 KASSERT(vm_radix_is_empty(&object->rtree),
191 ("object %p has resident pages in its trie", object));
192 #if VM_NRESERVLEVEL > 0
193 KASSERT(LIST_EMPTY(&object->rvq),
194 ("object %p has reservations",
197 KASSERT(object->paging_in_progress == 0,
198 ("object %p paging_in_progress = %d",
199 object, object->paging_in_progress));
200 KASSERT(object->resident_page_count == 0,
201 ("object %p resident_page_count = %d",
202 object, object->resident_page_count));
203 KASSERT(object->shadow_count == 0,
204 ("object %p shadow_count = %d",
205 object, object->shadow_count));
206 KASSERT(object->type == OBJT_DEAD,
207 ("object %p has non-dead type %d",
208 object, object->type));
213 vm_object_zinit(void *mem, int size, int flags)
217 object = (vm_object_t)mem;
218 rw_init_flags(&object->lock, "vm object", RW_DUPOK | RW_NEW);
220 /* These are true for any object that has been freed */
221 object->type = OBJT_DEAD;
222 object->ref_count = 0;
223 vm_radix_init(&object->rtree);
224 object->paging_in_progress = 0;
225 object->resident_page_count = 0;
226 object->shadow_count = 0;
227 object->flags = OBJ_DEAD;
229 mtx_lock(&vm_object_list_mtx);
230 TAILQ_INSERT_TAIL(&vm_object_list, object, object_list);
231 mtx_unlock(&vm_object_list_mtx);
236 _vm_object_allocate(objtype_t type, vm_pindex_t size, vm_object_t object)
239 TAILQ_INIT(&object->memq);
240 LIST_INIT(&object->shadow_head);
243 if (type == OBJT_SWAP)
244 pctrie_init(&object->un_pager.swp.swp_blks);
247 * Ensure that swap_pager_swapoff() iteration over object_list
248 * sees up to date type and pctrie head if it observed
251 atomic_thread_fence_rel();
255 panic("_vm_object_allocate: can't create OBJT_DEAD");
258 object->flags = OBJ_ONEMAPPING;
262 object->flags = OBJ_FICTITIOUS | OBJ_UNMANAGED;
265 object->flags = OBJ_FICTITIOUS;
268 object->flags = OBJ_UNMANAGED;
274 panic("_vm_object_allocate: type %d is undefined", type);
277 object->domain.dr_policy = NULL;
278 object->generation = 1;
279 object->ref_count = 1;
280 object->memattr = VM_MEMATTR_DEFAULT;
283 object->handle = NULL;
284 object->backing_object = NULL;
285 object->backing_object_offset = (vm_ooffset_t) 0;
286 #if VM_NRESERVLEVEL > 0
287 LIST_INIT(&object->rvq);
289 umtx_shm_object_init(object);
295 * Initialize the VM objects module.
300 TAILQ_INIT(&vm_object_list);
301 mtx_init(&vm_object_list_mtx, "vm object_list", NULL, MTX_DEF);
303 rw_init(&kernel_object->lock, "kernel vm object");
304 _vm_object_allocate(OBJT_PHYS, atop(VM_MAX_KERNEL_ADDRESS -
305 VM_MIN_KERNEL_ADDRESS), kernel_object);
306 #if VM_NRESERVLEVEL > 0
307 kernel_object->flags |= OBJ_COLORED;
308 kernel_object->pg_color = (u_short)atop(VM_MIN_KERNEL_ADDRESS);
312 * The lock portion of struct vm_object must be type stable due
313 * to vm_pageout_fallback_object_lock locking a vm object
314 * without holding any references to it.
316 obj_zone = uma_zcreate("VM OBJECT", sizeof (struct vm_object), NULL,
322 vm_object_zinit, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
328 vm_object_clear_flag(vm_object_t object, u_short bits)
331 VM_OBJECT_ASSERT_WLOCKED(object);
332 object->flags &= ~bits;
336 * Sets the default memory attribute for the specified object. Pages
337 * that are allocated to this object are by default assigned this memory
340 * Presently, this function must be called before any pages are allocated
341 * to the object. In the future, this requirement may be relaxed for
342 * "default" and "swap" objects.
345 vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr)
348 VM_OBJECT_ASSERT_WLOCKED(object);
349 switch (object->type) {
357 if (!TAILQ_EMPTY(&object->memq))
358 return (KERN_FAILURE);
361 return (KERN_INVALID_ARGUMENT);
363 panic("vm_object_set_memattr: object %p is of undefined type",
366 object->memattr = memattr;
367 return (KERN_SUCCESS);
371 vm_object_pip_add(vm_object_t object, short i)
374 VM_OBJECT_ASSERT_WLOCKED(object);
375 object->paging_in_progress += i;
379 vm_object_pip_subtract(vm_object_t object, short i)
382 VM_OBJECT_ASSERT_WLOCKED(object);
383 object->paging_in_progress -= i;
387 vm_object_pip_wakeup(vm_object_t object)
390 VM_OBJECT_ASSERT_WLOCKED(object);
391 object->paging_in_progress--;
392 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
393 vm_object_clear_flag(object, OBJ_PIPWNT);
399 vm_object_pip_wakeupn(vm_object_t object, short i)
402 VM_OBJECT_ASSERT_WLOCKED(object);
404 object->paging_in_progress -= i;
405 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
406 vm_object_clear_flag(object, OBJ_PIPWNT);
412 vm_object_pip_wait(vm_object_t object, char *waitid)
415 VM_OBJECT_ASSERT_WLOCKED(object);
416 while (object->paging_in_progress) {
417 object->flags |= OBJ_PIPWNT;
418 VM_OBJECT_SLEEP(object, object, PVM, waitid, 0);
423 * vm_object_allocate:
425 * Returns a new object with the given size.
428 vm_object_allocate(objtype_t type, vm_pindex_t size)
432 object = (vm_object_t)uma_zalloc(obj_zone, M_WAITOK);
433 _vm_object_allocate(type, size, object);
439 * vm_object_reference:
441 * Gets another reference to the given object. Note: OBJ_DEAD
442 * objects can be referenced during final cleaning.
445 vm_object_reference(vm_object_t object)
449 VM_OBJECT_WLOCK(object);
450 vm_object_reference_locked(object);
451 VM_OBJECT_WUNLOCK(object);
455 * vm_object_reference_locked:
457 * Gets another reference to the given object.
459 * The object must be locked.
462 vm_object_reference_locked(vm_object_t object)
466 VM_OBJECT_ASSERT_WLOCKED(object);
468 if (object->type == OBJT_VNODE) {
475 * Handle deallocating an object of type OBJT_VNODE.
478 vm_object_vndeallocate(vm_object_t object)
480 struct vnode *vp = (struct vnode *) object->handle;
482 VM_OBJECT_ASSERT_WLOCKED(object);
483 KASSERT(object->type == OBJT_VNODE,
484 ("vm_object_vndeallocate: not a vnode object"));
485 KASSERT(vp != NULL, ("vm_object_vndeallocate: missing vp"));
487 if (object->ref_count == 0) {
488 vn_printf(vp, "vm_object_vndeallocate ");
489 panic("vm_object_vndeallocate: bad object reference count");
493 if (!umtx_shm_vnobj_persistent && object->ref_count == 1)
494 umtx_shm_object_terminated(object);
498 /* vrele may need the vnode lock. */
499 VM_OBJECT_WUNLOCK(object);
504 * vm_object_deallocate:
506 * Release a reference to the specified object,
507 * gained either through a vm_object_allocate
508 * or a vm_object_reference call. When all references
509 * are gone, storage associated with this object
510 * may be relinquished.
512 * No object may be locked.
515 vm_object_deallocate(vm_object_t object)
520 while (object != NULL) {
521 VM_OBJECT_WLOCK(object);
522 if (object->type == OBJT_VNODE) {
523 vm_object_vndeallocate(object);
527 KASSERT(object->ref_count != 0,
528 ("vm_object_deallocate: object deallocated too many times: %d", object->type));
531 * If the reference count goes to 0 we start calling
532 * vm_object_terminate() on the object chain.
533 * A ref count of 1 may be a special case depending on the
534 * shadow count being 0 or 1.
537 if (object->ref_count > 1) {
538 VM_OBJECT_WUNLOCK(object);
540 } else if (object->ref_count == 1) {
541 if (object->type == OBJT_SWAP &&
542 (object->flags & OBJ_TMPFS) != 0) {
543 vp = object->un_pager.swp.swp_tmpfs;
545 VM_OBJECT_WUNLOCK(object);
546 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
547 VM_OBJECT_WLOCK(object);
548 if (object->type == OBJT_DEAD ||
549 object->ref_count != 1) {
550 VM_OBJECT_WUNLOCK(object);
555 if ((object->flags & OBJ_TMPFS) != 0)
560 if (object->shadow_count == 0 &&
561 object->handle == NULL &&
562 (object->type == OBJT_DEFAULT ||
563 (object->type == OBJT_SWAP &&
564 (object->flags & OBJ_TMPFS_NODE) == 0))) {
565 vm_object_set_flag(object, OBJ_ONEMAPPING);
566 } else if ((object->shadow_count == 1) &&
567 (object->handle == NULL) &&
568 (object->type == OBJT_DEFAULT ||
569 object->type == OBJT_SWAP)) {
572 robject = LIST_FIRST(&object->shadow_head);
573 KASSERT(robject != NULL,
574 ("vm_object_deallocate: ref_count: %d, shadow_count: %d",
576 object->shadow_count));
577 KASSERT((robject->flags & OBJ_TMPFS_NODE) == 0,
578 ("shadowed tmpfs v_object %p", object));
579 if (!VM_OBJECT_TRYWLOCK(robject)) {
581 * Avoid a potential deadlock.
584 VM_OBJECT_WUNLOCK(object);
586 * More likely than not the thread
587 * holding robject's lock has lower
588 * priority than the current thread.
589 * Let the lower priority thread run.
595 * Collapse object into its shadow unless its
596 * shadow is dead. In that case, object will
597 * be deallocated by the thread that is
598 * deallocating its shadow.
600 if ((robject->flags & OBJ_DEAD) == 0 &&
601 (robject->handle == NULL) &&
602 (robject->type == OBJT_DEFAULT ||
603 robject->type == OBJT_SWAP)) {
605 robject->ref_count++;
607 if (robject->paging_in_progress) {
608 VM_OBJECT_WUNLOCK(object);
609 vm_object_pip_wait(robject,
611 temp = robject->backing_object;
612 if (object == temp) {
613 VM_OBJECT_WLOCK(object);
616 } else if (object->paging_in_progress) {
617 VM_OBJECT_WUNLOCK(robject);
618 object->flags |= OBJ_PIPWNT;
619 VM_OBJECT_SLEEP(object, object,
620 PDROP | PVM, "objde2", 0);
621 VM_OBJECT_WLOCK(robject);
622 temp = robject->backing_object;
623 if (object == temp) {
624 VM_OBJECT_WLOCK(object);
628 VM_OBJECT_WUNLOCK(object);
630 if (robject->ref_count == 1) {
631 robject->ref_count--;
636 vm_object_collapse(object);
637 VM_OBJECT_WUNLOCK(object);
640 VM_OBJECT_WUNLOCK(robject);
642 VM_OBJECT_WUNLOCK(object);
646 umtx_shm_object_terminated(object);
647 temp = object->backing_object;
649 KASSERT((object->flags & OBJ_TMPFS_NODE) == 0,
650 ("shadowed tmpfs v_object 2 %p", object));
651 VM_OBJECT_WLOCK(temp);
652 LIST_REMOVE(object, shadow_list);
653 temp->shadow_count--;
654 VM_OBJECT_WUNLOCK(temp);
655 object->backing_object = NULL;
658 * Don't double-terminate, we could be in a termination
659 * recursion due to the terminate having to sync data
662 if ((object->flags & OBJ_DEAD) == 0)
663 vm_object_terminate(object);
665 VM_OBJECT_WUNLOCK(object);
671 * vm_object_destroy removes the object from the global object list
672 * and frees the space for the object.
675 vm_object_destroy(vm_object_t object)
679 * Release the allocation charge.
681 if (object->cred != NULL) {
682 swap_release_by_cred(object->charge, object->cred);
684 crfree(object->cred);
689 * Free the space for the object.
691 uma_zfree(obj_zone, object);
695 * vm_object_terminate_pages removes any remaining pageable pages
696 * from the object and resets the object to an empty state.
699 vm_object_terminate_pages(vm_object_t object)
704 VM_OBJECT_ASSERT_WLOCKED(object);
709 * Free any remaining pageable pages. This also removes them from the
710 * paging queues. However, don't free wired pages, just remove them
711 * from the object. Rather than incrementally removing each page from
712 * the object, the page and object are reset to any empty state.
714 TAILQ_FOREACH_SAFE(p, &object->memq, listq, p_next) {
715 vm_page_assert_unbusied(p);
716 if ((object->flags & OBJ_UNMANAGED) == 0)
718 * vm_page_free_prep() only needs the page
719 * lock for managed pages.
721 vm_page_change_lock(p, &mtx);
723 if (p->wire_count != 0)
732 * If the object contained any pages, then reset it to an empty state.
733 * None of the object's fields, including "resident_page_count", were
734 * modified by the preceding loop.
736 if (object->resident_page_count != 0) {
737 vm_radix_reclaim_allnodes(&object->rtree);
738 TAILQ_INIT(&object->memq);
739 object->resident_page_count = 0;
740 if (object->type == OBJT_VNODE)
741 vdrop(object->handle);
746 * vm_object_terminate actually destroys the specified object, freeing
747 * up all previously used resources.
749 * The object must be locked.
750 * This routine may block.
753 vm_object_terminate(vm_object_t object)
756 VM_OBJECT_ASSERT_WLOCKED(object);
759 * Make sure no one uses us.
761 vm_object_set_flag(object, OBJ_DEAD);
764 * wait for the pageout daemon to be done with the object
766 vm_object_pip_wait(object, "objtrm");
768 KASSERT(!object->paging_in_progress,
769 ("vm_object_terminate: pageout in progress"));
772 * Clean and free the pages, as appropriate. All references to the
773 * object are gone, so we don't need to lock it.
775 if (object->type == OBJT_VNODE) {
776 struct vnode *vp = (struct vnode *)object->handle;
779 * Clean pages and flush buffers.
781 vm_object_page_clean(object, 0, 0, OBJPC_SYNC);
782 VM_OBJECT_WUNLOCK(object);
784 vinvalbuf(vp, V_SAVE, 0, 0);
786 BO_LOCK(&vp->v_bufobj);
787 vp->v_bufobj.bo_flag |= BO_DEAD;
788 BO_UNLOCK(&vp->v_bufobj);
790 VM_OBJECT_WLOCK(object);
793 KASSERT(object->ref_count == 0,
794 ("vm_object_terminate: object with references, ref_count=%d",
797 if ((object->flags & OBJ_PG_DTOR) == 0)
798 vm_object_terminate_pages(object);
800 #if VM_NRESERVLEVEL > 0
801 if (__predict_false(!LIST_EMPTY(&object->rvq)))
802 vm_reserv_break_all(object);
805 KASSERT(object->cred == NULL || object->type == OBJT_DEFAULT ||
806 object->type == OBJT_SWAP,
807 ("%s: non-swap obj %p has cred", __func__, object));
810 * Let the pager know object is dead.
812 vm_pager_deallocate(object);
813 VM_OBJECT_WUNLOCK(object);
815 vm_object_destroy(object);
819 * Make the page read-only so that we can clear the object flags. However, if
820 * this is a nosync mmap then the object is likely to stay dirty so do not
821 * mess with the page and do not clear the object flags. Returns TRUE if the
822 * page should be flushed, and FALSE otherwise.
825 vm_object_page_remove_write(vm_page_t p, int flags, boolean_t *clearobjflags)
829 * If we have been asked to skip nosync pages and this is a
830 * nosync page, skip it. Note that the object flags were not
831 * cleared in this case so we do not have to set them.
833 if ((flags & OBJPC_NOSYNC) != 0 && (p->oflags & VPO_NOSYNC) != 0) {
834 *clearobjflags = FALSE;
837 pmap_remove_write(p);
838 return (p->dirty != 0);
843 * vm_object_page_clean
845 * Clean all dirty pages in the specified range of object. Leaves page
846 * on whatever queue it is currently on. If NOSYNC is set then do not
847 * write out pages with VPO_NOSYNC set (originally comes from MAP_NOSYNC),
848 * leaving the object dirty.
850 * When stuffing pages asynchronously, allow clustering. XXX we need a
851 * synchronous clustering mode implementation.
853 * Odd semantics: if start == end, we clean everything.
855 * The object must be locked.
857 * Returns FALSE if some page from the range was not written, as
858 * reported by the pager, and TRUE otherwise.
861 vm_object_page_clean(vm_object_t object, vm_ooffset_t start, vm_ooffset_t end,
865 vm_pindex_t pi, tend, tstart;
866 int curgeneration, n, pagerflags;
867 boolean_t clearobjflags, eio, res;
869 VM_OBJECT_ASSERT_WLOCKED(object);
872 * The OBJ_MIGHTBEDIRTY flag is only set for OBJT_VNODE
873 * objects. The check below prevents the function from
874 * operating on non-vnode objects.
876 if ((object->flags & OBJ_MIGHTBEDIRTY) == 0 ||
877 object->resident_page_count == 0)
880 pagerflags = (flags & (OBJPC_SYNC | OBJPC_INVAL)) != 0 ?
881 VM_PAGER_PUT_SYNC : VM_PAGER_CLUSTER_OK;
882 pagerflags |= (flags & OBJPC_INVAL) != 0 ? VM_PAGER_PUT_INVAL : 0;
884 tstart = OFF_TO_IDX(start);
885 tend = (end == 0) ? object->size : OFF_TO_IDX(end + PAGE_MASK);
886 clearobjflags = tstart == 0 && tend >= object->size;
890 curgeneration = object->generation;
892 for (p = vm_page_find_least(object, tstart); p != NULL; p = np) {
896 np = TAILQ_NEXT(p, listq);
899 if (vm_page_sleep_if_busy(p, "vpcwai")) {
900 if (object->generation != curgeneration) {
901 if ((flags & OBJPC_SYNC) != 0)
904 clearobjflags = FALSE;
906 np = vm_page_find_least(object, pi);
909 if (!vm_object_page_remove_write(p, flags, &clearobjflags))
912 n = vm_object_page_collect_flush(object, p, pagerflags,
913 flags, &clearobjflags, &eio);
916 clearobjflags = FALSE;
918 if (object->generation != curgeneration) {
919 if ((flags & OBJPC_SYNC) != 0)
922 clearobjflags = FALSE;
926 * If the VOP_PUTPAGES() did a truncated write, so
927 * that even the first page of the run is not fully
928 * written, vm_pageout_flush() returns 0 as the run
929 * length. Since the condition that caused truncated
930 * write may be permanent, e.g. exhausted free space,
931 * accepting n == 0 would cause an infinite loop.
933 * Forwarding the iterator leaves the unwritten page
934 * behind, but there is not much we can do there if
935 * filesystem refuses to write it.
939 clearobjflags = FALSE;
941 np = vm_page_find_least(object, pi + n);
944 VOP_FSYNC(vp, (pagerflags & VM_PAGER_PUT_SYNC) ? MNT_WAIT : 0);
948 vm_object_clear_flag(object, OBJ_MIGHTBEDIRTY);
953 vm_object_page_collect_flush(vm_object_t object, vm_page_t p, int pagerflags,
954 int flags, boolean_t *clearobjflags, boolean_t *eio)
956 vm_page_t ma[vm_pageout_page_count], p_first, tp;
957 int count, i, mreq, runlen;
959 vm_page_lock_assert(p, MA_NOTOWNED);
960 VM_OBJECT_ASSERT_WLOCKED(object);
965 for (tp = p; count < vm_pageout_page_count; count++) {
966 tp = vm_page_next(tp);
967 if (tp == NULL || vm_page_busied(tp))
969 if (!vm_object_page_remove_write(tp, flags, clearobjflags))
973 for (p_first = p; count < vm_pageout_page_count; count++) {
974 tp = vm_page_prev(p_first);
975 if (tp == NULL || vm_page_busied(tp))
977 if (!vm_object_page_remove_write(tp, flags, clearobjflags))
983 for (tp = p_first, i = 0; i < count; tp = TAILQ_NEXT(tp, listq), i++)
986 vm_pageout_flush(ma, count, pagerflags, mreq, &runlen, eio);
991 * Note that there is absolutely no sense in writing out
992 * anonymous objects, so we track down the vnode object
994 * We invalidate (remove) all pages from the address space
995 * for semantic correctness.
997 * If the backing object is a device object with unmanaged pages, then any
998 * mappings to the specified range of pages must be removed before this
999 * function is called.
1001 * Note: certain anonymous maps, such as MAP_NOSYNC maps,
1002 * may start out with a NULL object.
1005 vm_object_sync(vm_object_t object, vm_ooffset_t offset, vm_size_t size,
1006 boolean_t syncio, boolean_t invalidate)
1008 vm_object_t backing_object;
1011 int error, flags, fsync_after;
1018 VM_OBJECT_WLOCK(object);
1019 while ((backing_object = object->backing_object) != NULL) {
1020 VM_OBJECT_WLOCK(backing_object);
1021 offset += object->backing_object_offset;
1022 VM_OBJECT_WUNLOCK(object);
1023 object = backing_object;
1024 if (object->size < OFF_TO_IDX(offset + size))
1025 size = IDX_TO_OFF(object->size) - offset;
1028 * Flush pages if writing is allowed, invalidate them
1029 * if invalidation requested. Pages undergoing I/O
1030 * will be ignored by vm_object_page_remove().
1032 * We cannot lock the vnode and then wait for paging
1033 * to complete without deadlocking against vm_fault.
1034 * Instead we simply call vm_object_page_remove() and
1035 * allow it to block internally on a page-by-page
1036 * basis when it encounters pages undergoing async
1039 if (object->type == OBJT_VNODE &&
1040 (object->flags & OBJ_MIGHTBEDIRTY) != 0 &&
1041 ((vp = object->handle)->v_vflag & VV_NOSYNC) == 0) {
1042 VM_OBJECT_WUNLOCK(object);
1043 (void) vn_start_write(vp, &mp, V_WAIT);
1044 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1045 if (syncio && !invalidate && offset == 0 &&
1046 atop(size) == object->size) {
1048 * If syncing the whole mapping of the file,
1049 * it is faster to schedule all the writes in
1050 * async mode, also allowing the clustering,
1051 * and then wait for i/o to complete.
1056 flags = (syncio || invalidate) ? OBJPC_SYNC : 0;
1057 flags |= invalidate ? (OBJPC_SYNC | OBJPC_INVAL) : 0;
1058 fsync_after = FALSE;
1060 VM_OBJECT_WLOCK(object);
1061 res = vm_object_page_clean(object, offset, offset + size,
1063 VM_OBJECT_WUNLOCK(object);
1065 error = VOP_FSYNC(vp, MNT_WAIT, curthread);
1067 vn_finished_write(mp);
1070 VM_OBJECT_WLOCK(object);
1072 if ((object->type == OBJT_VNODE ||
1073 object->type == OBJT_DEVICE) && invalidate) {
1074 if (object->type == OBJT_DEVICE)
1076 * The option OBJPR_NOTMAPPED must be passed here
1077 * because vm_object_page_remove() cannot remove
1078 * unmanaged mappings.
1080 flags = OBJPR_NOTMAPPED;
1084 flags = OBJPR_CLEANONLY;
1085 vm_object_page_remove(object, OFF_TO_IDX(offset),
1086 OFF_TO_IDX(offset + size + PAGE_MASK), flags);
1088 VM_OBJECT_WUNLOCK(object);
1093 * Determine whether the given advice can be applied to the object. Advice is
1094 * not applied to unmanaged pages since they never belong to page queues, and
1095 * since MADV_FREE is destructive, it can apply only to anonymous pages that
1096 * have been mapped at most once.
1099 vm_object_advice_applies(vm_object_t object, int advice)
1102 if ((object->flags & OBJ_UNMANAGED) != 0)
1104 if (advice != MADV_FREE)
1106 return ((object->type == OBJT_DEFAULT || object->type == OBJT_SWAP) &&
1107 (object->flags & OBJ_ONEMAPPING) != 0);
1111 vm_object_madvise_freespace(vm_object_t object, int advice, vm_pindex_t pindex,
1115 if (advice == MADV_FREE && object->type == OBJT_SWAP)
1116 swap_pager_freespace(object, pindex, size);
1120 * vm_object_madvise:
1122 * Implements the madvise function at the object/page level.
1124 * MADV_WILLNEED (any object)
1126 * Activate the specified pages if they are resident.
1128 * MADV_DONTNEED (any object)
1130 * Deactivate the specified pages if they are resident.
1132 * MADV_FREE (OBJT_DEFAULT/OBJT_SWAP objects,
1133 * OBJ_ONEMAPPING only)
1135 * Deactivate and clean the specified pages if they are
1136 * resident. This permits the process to reuse the pages
1137 * without faulting or the kernel to reclaim the pages
1141 vm_object_madvise(vm_object_t object, vm_pindex_t pindex, vm_pindex_t end,
1144 vm_pindex_t tpindex;
1145 vm_object_t backing_object, tobject;
1152 VM_OBJECT_WLOCK(object);
1153 if (!vm_object_advice_applies(object, advice)) {
1154 VM_OBJECT_WUNLOCK(object);
1157 for (m = vm_page_find_least(object, pindex); pindex < end; pindex++) {
1161 * If the next page isn't resident in the top-level object, we
1162 * need to search the shadow chain. When applying MADV_FREE, we
1163 * take care to release any swap space used to store
1164 * non-resident pages.
1166 if (m == NULL || pindex < m->pindex) {
1168 * Optimize a common case: if the top-level object has
1169 * no backing object, we can skip over the non-resident
1170 * range in constant time.
1172 if (object->backing_object == NULL) {
1173 tpindex = (m != NULL && m->pindex < end) ?
1175 vm_object_madvise_freespace(object, advice,
1176 pindex, tpindex - pindex);
1177 if ((pindex = tpindex) == end)
1184 vm_object_madvise_freespace(tobject, advice,
1187 * Prepare to search the next object in the
1190 backing_object = tobject->backing_object;
1191 if (backing_object == NULL)
1193 VM_OBJECT_WLOCK(backing_object);
1195 OFF_TO_IDX(tobject->backing_object_offset);
1196 if (tobject != object)
1197 VM_OBJECT_WUNLOCK(tobject);
1198 tobject = backing_object;
1199 if (!vm_object_advice_applies(tobject, advice))
1201 } while ((tm = vm_page_lookup(tobject, tpindex)) ==
1206 m = TAILQ_NEXT(m, listq);
1210 * If the page is not in a normal state, skip it.
1212 if (tm->valid != VM_PAGE_BITS_ALL)
1215 if (vm_page_held(tm)) {
1219 KASSERT((tm->flags & PG_FICTITIOUS) == 0,
1220 ("vm_object_madvise: page %p is fictitious", tm));
1221 KASSERT((tm->oflags & VPO_UNMANAGED) == 0,
1222 ("vm_object_madvise: page %p is not managed", tm));
1223 if (vm_page_busied(tm)) {
1224 if (object != tobject)
1225 VM_OBJECT_WUNLOCK(tobject);
1226 VM_OBJECT_WUNLOCK(object);
1227 if (advice == MADV_WILLNEED) {
1229 * Reference the page before unlocking and
1230 * sleeping so that the page daemon is less
1231 * likely to reclaim it.
1233 vm_page_aflag_set(tm, PGA_REFERENCED);
1235 vm_page_busy_sleep(tm, "madvpo", false);
1238 vm_page_advise(tm, advice);
1240 vm_object_madvise_freespace(tobject, advice, tm->pindex, 1);
1242 if (tobject != object)
1243 VM_OBJECT_WUNLOCK(tobject);
1245 VM_OBJECT_WUNLOCK(object);
1251 * Create a new object which is backed by the
1252 * specified existing object range. The source
1253 * object reference is deallocated.
1255 * The new object and offset into that object
1256 * are returned in the source parameters.
1260 vm_object_t *object, /* IN/OUT */
1261 vm_ooffset_t *offset, /* IN/OUT */
1270 * Don't create the new object if the old object isn't shared.
1272 if (source != NULL) {
1273 VM_OBJECT_WLOCK(source);
1274 if (source->ref_count == 1 &&
1275 source->handle == NULL &&
1276 (source->type == OBJT_DEFAULT ||
1277 source->type == OBJT_SWAP)) {
1278 VM_OBJECT_WUNLOCK(source);
1281 VM_OBJECT_WUNLOCK(source);
1285 * Allocate a new object with the given length.
1287 result = vm_object_allocate(OBJT_DEFAULT, atop(length));
1290 * The new object shadows the source object, adding a reference to it.
1291 * Our caller changes his reference to point to the new object,
1292 * removing a reference to the source object. Net result: no change
1293 * of reference count.
1295 * Try to optimize the result object's page color when shadowing
1296 * in order to maintain page coloring consistency in the combined
1299 result->backing_object = source;
1301 * Store the offset into the source object, and fix up the offset into
1304 result->backing_object_offset = *offset;
1305 if (source != NULL) {
1306 VM_OBJECT_WLOCK(source);
1307 result->domain = source->domain;
1308 LIST_INSERT_HEAD(&source->shadow_head, result, shadow_list);
1309 source->shadow_count++;
1310 #if VM_NRESERVLEVEL > 0
1311 result->flags |= source->flags & OBJ_COLORED;
1312 result->pg_color = (source->pg_color + OFF_TO_IDX(*offset)) &
1313 ((1 << (VM_NFREEORDER - 1)) - 1);
1315 VM_OBJECT_WUNLOCK(source);
1320 * Return the new things
1329 * Split the pages in a map entry into a new object. This affords
1330 * easier removal of unused pages, and keeps object inheritance from
1331 * being a negative impact on memory usage.
1334 vm_object_split(vm_map_entry_t entry)
1336 vm_page_t m, m_next;
1337 vm_object_t orig_object, new_object, source;
1338 vm_pindex_t idx, offidxstart;
1341 orig_object = entry->object.vm_object;
1342 if (orig_object->type != OBJT_DEFAULT && orig_object->type != OBJT_SWAP)
1344 if (orig_object->ref_count <= 1)
1346 VM_OBJECT_WUNLOCK(orig_object);
1348 offidxstart = OFF_TO_IDX(entry->offset);
1349 size = atop(entry->end - entry->start);
1352 * If swap_pager_copy() is later called, it will convert new_object
1353 * into a swap object.
1355 new_object = vm_object_allocate(OBJT_DEFAULT, size);
1358 * At this point, the new object is still private, so the order in
1359 * which the original and new objects are locked does not matter.
1361 VM_OBJECT_WLOCK(new_object);
1362 VM_OBJECT_WLOCK(orig_object);
1363 new_object->domain = orig_object->domain;
1364 source = orig_object->backing_object;
1365 if (source != NULL) {
1366 VM_OBJECT_WLOCK(source);
1367 if ((source->flags & OBJ_DEAD) != 0) {
1368 VM_OBJECT_WUNLOCK(source);
1369 VM_OBJECT_WUNLOCK(orig_object);
1370 VM_OBJECT_WUNLOCK(new_object);
1371 vm_object_deallocate(new_object);
1372 VM_OBJECT_WLOCK(orig_object);
1375 LIST_INSERT_HEAD(&source->shadow_head,
1376 new_object, shadow_list);
1377 source->shadow_count++;
1378 vm_object_reference_locked(source); /* for new_object */
1379 vm_object_clear_flag(source, OBJ_ONEMAPPING);
1380 VM_OBJECT_WUNLOCK(source);
1381 new_object->backing_object_offset =
1382 orig_object->backing_object_offset + entry->offset;
1383 new_object->backing_object = source;
1385 if (orig_object->cred != NULL) {
1386 new_object->cred = orig_object->cred;
1387 crhold(orig_object->cred);
1388 new_object->charge = ptoa(size);
1389 KASSERT(orig_object->charge >= ptoa(size),
1390 ("orig_object->charge < 0"));
1391 orig_object->charge -= ptoa(size);
1394 m = vm_page_find_least(orig_object, offidxstart);
1395 for (; m != NULL && (idx = m->pindex - offidxstart) < size;
1397 m_next = TAILQ_NEXT(m, listq);
1400 * We must wait for pending I/O to complete before we can
1403 * We do not have to VM_PROT_NONE the page as mappings should
1404 * not be changed by this operation.
1406 if (vm_page_busied(m)) {
1407 VM_OBJECT_WUNLOCK(new_object);
1409 VM_OBJECT_WUNLOCK(orig_object);
1410 vm_page_busy_sleep(m, "spltwt", false);
1411 VM_OBJECT_WLOCK(orig_object);
1412 VM_OBJECT_WLOCK(new_object);
1416 /* vm_page_rename() will dirty the page. */
1417 if (vm_page_rename(m, new_object, idx)) {
1418 VM_OBJECT_WUNLOCK(new_object);
1419 VM_OBJECT_WUNLOCK(orig_object);
1421 VM_OBJECT_WLOCK(orig_object);
1422 VM_OBJECT_WLOCK(new_object);
1425 #if VM_NRESERVLEVEL > 0
1427 * If some of the reservation's allocated pages remain with
1428 * the original object, then transferring the reservation to
1429 * the new object is neither particularly beneficial nor
1430 * particularly harmful as compared to leaving the reservation
1431 * with the original object. If, however, all of the
1432 * reservation's allocated pages are transferred to the new
1433 * object, then transferring the reservation is typically
1434 * beneficial. Determining which of these two cases applies
1435 * would be more costly than unconditionally renaming the
1438 vm_reserv_rename(m, new_object, orig_object, offidxstart);
1440 if (orig_object->type == OBJT_SWAP)
1443 if (orig_object->type == OBJT_SWAP) {
1445 * swap_pager_copy() can sleep, in which case the orig_object's
1446 * and new_object's locks are released and reacquired.
1448 swap_pager_copy(orig_object, new_object, offidxstart, 0);
1449 TAILQ_FOREACH(m, &new_object->memq, listq)
1452 VM_OBJECT_WUNLOCK(orig_object);
1453 VM_OBJECT_WUNLOCK(new_object);
1454 entry->object.vm_object = new_object;
1455 entry->offset = 0LL;
1456 vm_object_deallocate(orig_object);
1457 VM_OBJECT_WLOCK(new_object);
1460 #define OBSC_COLLAPSE_NOWAIT 0x0002
1461 #define OBSC_COLLAPSE_WAIT 0x0004
1464 vm_object_collapse_scan_wait(vm_object_t object, vm_page_t p, vm_page_t next,
1467 vm_object_t backing_object;
1469 VM_OBJECT_ASSERT_WLOCKED(object);
1470 backing_object = object->backing_object;
1471 VM_OBJECT_ASSERT_WLOCKED(backing_object);
1473 KASSERT(p == NULL || vm_page_busied(p), ("unbusy page %p", p));
1474 KASSERT(p == NULL || p->object == object || p->object == backing_object,
1475 ("invalid ownership %p %p %p", p, object, backing_object));
1476 if ((op & OBSC_COLLAPSE_NOWAIT) != 0)
1480 VM_OBJECT_WUNLOCK(object);
1481 VM_OBJECT_WUNLOCK(backing_object);
1482 /* The page is only NULL when rename fails. */
1486 vm_page_busy_sleep(p, "vmocol", false);
1487 VM_OBJECT_WLOCK(object);
1488 VM_OBJECT_WLOCK(backing_object);
1489 return (TAILQ_FIRST(&backing_object->memq));
1493 vm_object_scan_all_shadowed(vm_object_t object)
1495 vm_object_t backing_object;
1497 vm_pindex_t backing_offset_index, new_pindex, pi, ps;
1499 VM_OBJECT_ASSERT_WLOCKED(object);
1500 VM_OBJECT_ASSERT_WLOCKED(object->backing_object);
1502 backing_object = object->backing_object;
1504 if (backing_object->type != OBJT_DEFAULT &&
1505 backing_object->type != OBJT_SWAP)
1508 pi = backing_offset_index = OFF_TO_IDX(object->backing_object_offset);
1509 p = vm_page_find_least(backing_object, pi);
1510 ps = swap_pager_find_least(backing_object, pi);
1513 * Only check pages inside the parent object's range and
1514 * inside the parent object's mapping of the backing object.
1517 if (p != NULL && p->pindex < pi)
1518 p = TAILQ_NEXT(p, listq);
1520 ps = swap_pager_find_least(backing_object, pi);
1521 if (p == NULL && ps >= backing_object->size)
1526 pi = MIN(p->pindex, ps);
1528 new_pindex = pi - backing_offset_index;
1529 if (new_pindex >= object->size)
1533 * See if the parent has the page or if the parent's object
1534 * pager has the page. If the parent has the page but the page
1535 * is not valid, the parent's object pager must have the page.
1537 * If this fails, the parent does not completely shadow the
1538 * object and we might as well give up now.
1540 pp = vm_page_lookup(object, new_pindex);
1541 if ((pp == NULL || pp->valid == 0) &&
1542 !vm_pager_has_page(object, new_pindex, NULL, NULL))
1549 vm_object_collapse_scan(vm_object_t object, int op)
1551 vm_object_t backing_object;
1552 vm_page_t next, p, pp;
1553 vm_pindex_t backing_offset_index, new_pindex;
1555 VM_OBJECT_ASSERT_WLOCKED(object);
1556 VM_OBJECT_ASSERT_WLOCKED(object->backing_object);
1558 backing_object = object->backing_object;
1559 backing_offset_index = OFF_TO_IDX(object->backing_object_offset);
1562 * Initial conditions
1564 if ((op & OBSC_COLLAPSE_WAIT) != 0)
1565 vm_object_set_flag(backing_object, OBJ_DEAD);
1570 for (p = TAILQ_FIRST(&backing_object->memq); p != NULL; p = next) {
1571 next = TAILQ_NEXT(p, listq);
1572 new_pindex = p->pindex - backing_offset_index;
1575 * Check for busy page
1577 if (vm_page_busied(p)) {
1578 next = vm_object_collapse_scan_wait(object, p, next, op);
1582 KASSERT(p->object == backing_object,
1583 ("vm_object_collapse_scan: object mismatch"));
1585 if (p->pindex < backing_offset_index ||
1586 new_pindex >= object->size) {
1587 if (backing_object->type == OBJT_SWAP)
1588 swap_pager_freespace(backing_object, p->pindex,
1592 * Page is out of the parent object's range, we can
1593 * simply destroy it.
1596 KASSERT(!pmap_page_is_mapped(p),
1597 ("freeing mapped page %p", p));
1598 if (p->wire_count == 0)
1606 pp = vm_page_lookup(object, new_pindex);
1607 if (pp != NULL && vm_page_busied(pp)) {
1609 * The page in the parent is busy and possibly not
1610 * (yet) valid. Until its state is finalized by the
1611 * busy bit owner, we can't tell whether it shadows the
1612 * original page. Therefore, we must either skip it
1613 * and the original (backing_object) page or wait for
1614 * its state to be finalized.
1616 * This is due to a race with vm_fault() where we must
1617 * unbusy the original (backing_obj) page before we can
1618 * (re)lock the parent. Hence we can get here.
1620 next = vm_object_collapse_scan_wait(object, pp, next,
1625 KASSERT(pp == NULL || pp->valid != 0,
1626 ("unbusy invalid page %p", pp));
1628 if (pp != NULL || vm_pager_has_page(object, new_pindex, NULL,
1631 * The page already exists in the parent OR swap exists
1632 * for this location in the parent. Leave the parent's
1633 * page alone. Destroy the original page from the
1636 if (backing_object->type == OBJT_SWAP)
1637 swap_pager_freespace(backing_object, p->pindex,
1640 KASSERT(!pmap_page_is_mapped(p),
1641 ("freeing mapped page %p", p));
1642 if (p->wire_count == 0)
1651 * Page does not exist in parent, rename the page from the
1652 * backing object to the main object.
1654 * If the page was mapped to a process, it can remain mapped
1655 * through the rename. vm_page_rename() will dirty the page.
1657 if (vm_page_rename(p, object, new_pindex)) {
1658 next = vm_object_collapse_scan_wait(object, NULL, next,
1663 /* Use the old pindex to free the right page. */
1664 if (backing_object->type == OBJT_SWAP)
1665 swap_pager_freespace(backing_object,
1666 new_pindex + backing_offset_index, 1);
1668 #if VM_NRESERVLEVEL > 0
1670 * Rename the reservation.
1672 vm_reserv_rename(p, object, backing_object,
1673 backing_offset_index);
1681 * this version of collapse allows the operation to occur earlier and
1682 * when paging_in_progress is true for an object... This is not a complete
1683 * operation, but should plug 99.9% of the rest of the leaks.
1686 vm_object_qcollapse(vm_object_t object)
1688 vm_object_t backing_object = object->backing_object;
1690 VM_OBJECT_ASSERT_WLOCKED(object);
1691 VM_OBJECT_ASSERT_WLOCKED(backing_object);
1693 if (backing_object->ref_count != 1)
1696 vm_object_collapse_scan(object, OBSC_COLLAPSE_NOWAIT);
1700 * vm_object_collapse:
1702 * Collapse an object with the object backing it.
1703 * Pages in the backing object are moved into the
1704 * parent, and the backing object is deallocated.
1707 vm_object_collapse(vm_object_t object)
1709 vm_object_t backing_object, new_backing_object;
1711 VM_OBJECT_ASSERT_WLOCKED(object);
1715 * Verify that the conditions are right for collapse:
1717 * The object exists and the backing object exists.
1719 if ((backing_object = object->backing_object) == NULL)
1723 * we check the backing object first, because it is most likely
1726 VM_OBJECT_WLOCK(backing_object);
1727 if (backing_object->handle != NULL ||
1728 (backing_object->type != OBJT_DEFAULT &&
1729 backing_object->type != OBJT_SWAP) ||
1730 (backing_object->flags & (OBJ_DEAD | OBJ_NOSPLIT)) != 0 ||
1731 object->handle != NULL ||
1732 (object->type != OBJT_DEFAULT &&
1733 object->type != OBJT_SWAP) ||
1734 (object->flags & OBJ_DEAD)) {
1735 VM_OBJECT_WUNLOCK(backing_object);
1739 if (object->paging_in_progress != 0 ||
1740 backing_object->paging_in_progress != 0) {
1741 vm_object_qcollapse(object);
1742 VM_OBJECT_WUNLOCK(backing_object);
1747 * We know that we can either collapse the backing object (if
1748 * the parent is the only reference to it) or (perhaps) have
1749 * the parent bypass the object if the parent happens to shadow
1750 * all the resident pages in the entire backing object.
1752 * This is ignoring pager-backed pages such as swap pages.
1753 * vm_object_collapse_scan fails the shadowing test in this
1756 if (backing_object->ref_count == 1) {
1757 vm_object_pip_add(object, 1);
1758 vm_object_pip_add(backing_object, 1);
1761 * If there is exactly one reference to the backing
1762 * object, we can collapse it into the parent.
1764 vm_object_collapse_scan(object, OBSC_COLLAPSE_WAIT);
1766 #if VM_NRESERVLEVEL > 0
1768 * Break any reservations from backing_object.
1770 if (__predict_false(!LIST_EMPTY(&backing_object->rvq)))
1771 vm_reserv_break_all(backing_object);
1775 * Move the pager from backing_object to object.
1777 if (backing_object->type == OBJT_SWAP) {
1779 * swap_pager_copy() can sleep, in which case
1780 * the backing_object's and object's locks are
1781 * released and reacquired.
1782 * Since swap_pager_copy() is being asked to
1783 * destroy the source, it will change the
1784 * backing_object's type to OBJT_DEFAULT.
1789 OFF_TO_IDX(object->backing_object_offset), TRUE);
1792 * Object now shadows whatever backing_object did.
1793 * Note that the reference to
1794 * backing_object->backing_object moves from within
1795 * backing_object to within object.
1797 LIST_REMOVE(object, shadow_list);
1798 backing_object->shadow_count--;
1799 if (backing_object->backing_object) {
1800 VM_OBJECT_WLOCK(backing_object->backing_object);
1801 LIST_REMOVE(backing_object, shadow_list);
1803 &backing_object->backing_object->shadow_head,
1804 object, shadow_list);
1806 * The shadow_count has not changed.
1808 VM_OBJECT_WUNLOCK(backing_object->backing_object);
1810 object->backing_object = backing_object->backing_object;
1811 object->backing_object_offset +=
1812 backing_object->backing_object_offset;
1815 * Discard backing_object.
1817 * Since the backing object has no pages, no pager left,
1818 * and no object references within it, all that is
1819 * necessary is to dispose of it.
1821 KASSERT(backing_object->ref_count == 1, (
1822 "backing_object %p was somehow re-referenced during collapse!",
1824 vm_object_pip_wakeup(backing_object);
1825 backing_object->type = OBJT_DEAD;
1826 backing_object->ref_count = 0;
1827 VM_OBJECT_WUNLOCK(backing_object);
1828 vm_object_destroy(backing_object);
1830 vm_object_pip_wakeup(object);
1831 counter_u64_add(object_collapses, 1);
1834 * If we do not entirely shadow the backing object,
1835 * there is nothing we can do so we give up.
1837 if (object->resident_page_count != object->size &&
1838 !vm_object_scan_all_shadowed(object)) {
1839 VM_OBJECT_WUNLOCK(backing_object);
1844 * Make the parent shadow the next object in the
1845 * chain. Deallocating backing_object will not remove
1846 * it, since its reference count is at least 2.
1848 LIST_REMOVE(object, shadow_list);
1849 backing_object->shadow_count--;
1851 new_backing_object = backing_object->backing_object;
1852 if ((object->backing_object = new_backing_object) != NULL) {
1853 VM_OBJECT_WLOCK(new_backing_object);
1855 &new_backing_object->shadow_head,
1859 new_backing_object->shadow_count++;
1860 vm_object_reference_locked(new_backing_object);
1861 VM_OBJECT_WUNLOCK(new_backing_object);
1862 object->backing_object_offset +=
1863 backing_object->backing_object_offset;
1867 * Drop the reference count on backing_object. Since
1868 * its ref_count was at least 2, it will not vanish.
1870 backing_object->ref_count--;
1871 VM_OBJECT_WUNLOCK(backing_object);
1872 counter_u64_add(object_bypasses, 1);
1876 * Try again with this object's new backing object.
1882 * vm_object_page_remove:
1884 * For the given object, either frees or invalidates each of the
1885 * specified pages. In general, a page is freed. However, if a page is
1886 * wired for any reason other than the existence of a managed, wired
1887 * mapping, then it may be invalidated but not removed from the object.
1888 * Pages are specified by the given range ["start", "end") and the option
1889 * OBJPR_CLEANONLY. As a special case, if "end" is zero, then the range
1890 * extends from "start" to the end of the object. If the option
1891 * OBJPR_CLEANONLY is specified, then only the non-dirty pages within the
1892 * specified range are affected. If the option OBJPR_NOTMAPPED is
1893 * specified, then the pages within the specified range must have no
1894 * mappings. Otherwise, if this option is not specified, any mappings to
1895 * the specified pages are removed before the pages are freed or
1898 * In general, this operation should only be performed on objects that
1899 * contain managed pages. There are, however, two exceptions. First, it
1900 * is performed on the kernel and kmem objects by vm_map_entry_delete().
1901 * Second, it is used by msync(..., MS_INVALIDATE) to invalidate device-
1902 * backed pages. In both of these cases, the option OBJPR_CLEANONLY must
1903 * not be specified and the option OBJPR_NOTMAPPED must be specified.
1905 * The object must be locked.
1908 vm_object_page_remove(vm_object_t object, vm_pindex_t start, vm_pindex_t end,
1914 VM_OBJECT_ASSERT_WLOCKED(object);
1915 KASSERT((object->flags & OBJ_UNMANAGED) == 0 ||
1916 (options & (OBJPR_CLEANONLY | OBJPR_NOTMAPPED)) == OBJPR_NOTMAPPED,
1917 ("vm_object_page_remove: illegal options for object %p", object));
1918 if (object->resident_page_count == 0)
1920 vm_object_pip_add(object, 1);
1922 p = vm_page_find_least(object, start);
1926 * Here, the variable "p" is either (1) the page with the least pindex
1927 * greater than or equal to the parameter "start" or (2) NULL.
1929 for (; p != NULL && (p->pindex < end || end == 0); p = next) {
1930 next = TAILQ_NEXT(p, listq);
1933 * If the page is wired for any reason besides the existence
1934 * of managed, wired mappings, then it cannot be freed. For
1935 * example, fictitious pages, which represent device memory,
1936 * are inherently wired and cannot be freed. They can,
1937 * however, be invalidated if the option OBJPR_CLEANONLY is
1940 vm_page_change_lock(p, &mtx);
1941 if (vm_page_xbusied(p)) {
1942 VM_OBJECT_WUNLOCK(object);
1943 vm_page_busy_sleep(p, "vmopax", true);
1944 VM_OBJECT_WLOCK(object);
1947 if (p->wire_count != 0) {
1948 if ((options & OBJPR_NOTMAPPED) == 0 &&
1949 object->ref_count != 0)
1951 if ((options & OBJPR_CLEANONLY) == 0) {
1957 if (vm_page_busied(p)) {
1958 VM_OBJECT_WUNLOCK(object);
1959 vm_page_busy_sleep(p, "vmopar", false);
1960 VM_OBJECT_WLOCK(object);
1963 KASSERT((p->flags & PG_FICTITIOUS) == 0,
1964 ("vm_object_page_remove: page %p is fictitious", p));
1965 if ((options & OBJPR_CLEANONLY) != 0 && p->valid != 0) {
1966 if ((options & OBJPR_NOTMAPPED) == 0 &&
1967 object->ref_count != 0)
1968 pmap_remove_write(p);
1972 if ((options & OBJPR_NOTMAPPED) == 0 && object->ref_count != 0)
1978 vm_object_pip_wakeup(object);
1982 * vm_object_page_noreuse:
1984 * For the given object, attempt to move the specified pages to
1985 * the head of the inactive queue. This bypasses regular LRU
1986 * operation and allows the pages to be reused quickly under memory
1987 * pressure. If a page is wired for any reason, then it will not
1988 * be queued. Pages are specified by the range ["start", "end").
1989 * As a special case, if "end" is zero, then the range extends from
1990 * "start" to the end of the object.
1992 * This operation should only be performed on objects that
1993 * contain non-fictitious, managed pages.
1995 * The object must be locked.
1998 vm_object_page_noreuse(vm_object_t object, vm_pindex_t start, vm_pindex_t end)
2003 VM_OBJECT_ASSERT_LOCKED(object);
2004 KASSERT((object->flags & (OBJ_FICTITIOUS | OBJ_UNMANAGED)) == 0,
2005 ("vm_object_page_noreuse: illegal object %p", object));
2006 if (object->resident_page_count == 0)
2008 p = vm_page_find_least(object, start);
2011 * Here, the variable "p" is either (1) the page with the least pindex
2012 * greater than or equal to the parameter "start" or (2) NULL.
2015 for (; p != NULL && (p->pindex < end || end == 0); p = next) {
2016 next = TAILQ_NEXT(p, listq);
2017 vm_page_change_lock(p, &mtx);
2018 vm_page_deactivate_noreuse(p);
2025 * Populate the specified range of the object with valid pages. Returns
2026 * TRUE if the range is successfully populated and FALSE otherwise.
2028 * Note: This function should be optimized to pass a larger array of
2029 * pages to vm_pager_get_pages() before it is applied to a non-
2030 * OBJT_DEVICE object.
2032 * The object must be locked.
2035 vm_object_populate(vm_object_t object, vm_pindex_t start, vm_pindex_t end)
2041 VM_OBJECT_ASSERT_WLOCKED(object);
2042 for (pindex = start; pindex < end; pindex++) {
2043 m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL);
2044 if (m->valid != VM_PAGE_BITS_ALL) {
2045 rv = vm_pager_get_pages(object, &m, 1, NULL, NULL);
2046 if (rv != VM_PAGER_OK) {
2054 * Keep "m" busy because a subsequent iteration may unlock
2058 if (pindex > start) {
2059 m = vm_page_lookup(object, start);
2060 while (m != NULL && m->pindex < pindex) {
2062 m = TAILQ_NEXT(m, listq);
2065 return (pindex == end);
2069 * Routine: vm_object_coalesce
2070 * Function: Coalesces two objects backing up adjoining
2071 * regions of memory into a single object.
2073 * returns TRUE if objects were combined.
2075 * NOTE: Only works at the moment if the second object is NULL -
2076 * if it's not, which object do we lock first?
2079 * prev_object First object to coalesce
2080 * prev_offset Offset into prev_object
2081 * prev_size Size of reference to prev_object
2082 * next_size Size of reference to the second object
2083 * reserved Indicator that extension region has
2084 * swap accounted for
2087 * The object must *not* be locked.
2090 vm_object_coalesce(vm_object_t prev_object, vm_ooffset_t prev_offset,
2091 vm_size_t prev_size, vm_size_t next_size, boolean_t reserved)
2093 vm_pindex_t next_pindex;
2095 if (prev_object == NULL)
2097 VM_OBJECT_WLOCK(prev_object);
2098 if ((prev_object->type != OBJT_DEFAULT &&
2099 prev_object->type != OBJT_SWAP) ||
2100 (prev_object->flags & OBJ_TMPFS_NODE) != 0) {
2101 VM_OBJECT_WUNLOCK(prev_object);
2106 * Try to collapse the object first
2108 vm_object_collapse(prev_object);
2111 * Can't coalesce if: . more than one reference . paged out . shadows
2112 * another object . has a copy elsewhere (any of which mean that the
2113 * pages not mapped to prev_entry may be in use anyway)
2115 if (prev_object->backing_object != NULL) {
2116 VM_OBJECT_WUNLOCK(prev_object);
2120 prev_size >>= PAGE_SHIFT;
2121 next_size >>= PAGE_SHIFT;
2122 next_pindex = OFF_TO_IDX(prev_offset) + prev_size;
2124 if (prev_object->ref_count > 1 &&
2125 prev_object->size != next_pindex &&
2126 (prev_object->flags & OBJ_ONEMAPPING) == 0) {
2127 VM_OBJECT_WUNLOCK(prev_object);
2132 * Account for the charge.
2134 if (prev_object->cred != NULL) {
2137 * If prev_object was charged, then this mapping,
2138 * although not charged now, may become writable
2139 * later. Non-NULL cred in the object would prevent
2140 * swap reservation during enabling of the write
2141 * access, so reserve swap now. Failed reservation
2142 * cause allocation of the separate object for the map
2143 * entry, and swap reservation for this entry is
2144 * managed in appropriate time.
2146 if (!reserved && !swap_reserve_by_cred(ptoa(next_size),
2147 prev_object->cred)) {
2148 VM_OBJECT_WUNLOCK(prev_object);
2151 prev_object->charge += ptoa(next_size);
2155 * Remove any pages that may still be in the object from a previous
2158 if (next_pindex < prev_object->size) {
2159 vm_object_page_remove(prev_object, next_pindex, next_pindex +
2161 if (prev_object->type == OBJT_SWAP)
2162 swap_pager_freespace(prev_object,
2163 next_pindex, next_size);
2165 if (prev_object->cred != NULL) {
2166 KASSERT(prev_object->charge >=
2167 ptoa(prev_object->size - next_pindex),
2168 ("object %p overcharged 1 %jx %jx", prev_object,
2169 (uintmax_t)next_pindex, (uintmax_t)next_size));
2170 prev_object->charge -= ptoa(prev_object->size -
2177 * Extend the object if necessary.
2179 if (next_pindex + next_size > prev_object->size)
2180 prev_object->size = next_pindex + next_size;
2182 VM_OBJECT_WUNLOCK(prev_object);
2187 vm_object_set_writeable_dirty(vm_object_t object)
2190 VM_OBJECT_ASSERT_WLOCKED(object);
2191 if (object->type != OBJT_VNODE) {
2192 if ((object->flags & OBJ_TMPFS_NODE) != 0) {
2193 KASSERT(object->type == OBJT_SWAP, ("non-swap tmpfs"));
2194 vm_object_set_flag(object, OBJ_TMPFS_DIRTY);
2198 object->generation++;
2199 if ((object->flags & OBJ_MIGHTBEDIRTY) != 0)
2201 vm_object_set_flag(object, OBJ_MIGHTBEDIRTY);
2207 * For each page offset within the specified range of the given object,
2208 * find the highest-level page in the shadow chain and unwire it. A page
2209 * must exist at every page offset, and the highest-level page must be
2213 vm_object_unwire(vm_object_t object, vm_ooffset_t offset, vm_size_t length,
2216 vm_object_t tobject, t1object;
2218 vm_pindex_t end_pindex, pindex, tpindex;
2219 int depth, locked_depth;
2221 KASSERT((offset & PAGE_MASK) == 0,
2222 ("vm_object_unwire: offset is not page aligned"));
2223 KASSERT((length & PAGE_MASK) == 0,
2224 ("vm_object_unwire: length is not a multiple of PAGE_SIZE"));
2225 /* The wired count of a fictitious page never changes. */
2226 if ((object->flags & OBJ_FICTITIOUS) != 0)
2228 pindex = OFF_TO_IDX(offset);
2229 end_pindex = pindex + atop(length);
2232 VM_OBJECT_RLOCK(object);
2233 m = vm_page_find_least(object, pindex);
2234 while (pindex < end_pindex) {
2235 if (m == NULL || pindex < m->pindex) {
2237 * The first object in the shadow chain doesn't
2238 * contain a page at the current index. Therefore,
2239 * the page must exist in a backing object.
2246 OFF_TO_IDX(tobject->backing_object_offset);
2247 tobject = tobject->backing_object;
2248 KASSERT(tobject != NULL,
2249 ("vm_object_unwire: missing page"));
2250 if ((tobject->flags & OBJ_FICTITIOUS) != 0)
2253 if (depth == locked_depth) {
2255 VM_OBJECT_RLOCK(tobject);
2257 } while ((tm = vm_page_lookup(tobject, tpindex)) ==
2261 m = TAILQ_NEXT(m, listq);
2264 if (vm_page_xbusied(tm)) {
2265 for (tobject = object; locked_depth >= 1;
2267 t1object = tobject->backing_object;
2268 VM_OBJECT_RUNLOCK(tobject);
2271 vm_page_busy_sleep(tm, "unwbo", true);
2274 vm_page_unwire(tm, queue);
2279 /* Release the accumulated object locks. */
2280 for (tobject = object; locked_depth >= 1; locked_depth--) {
2281 t1object = tobject->backing_object;
2282 VM_OBJECT_RUNLOCK(tobject);
2288 * Return the vnode for the given object, or NULL if none exists.
2289 * For tmpfs objects, the function may return NULL if there is
2290 * no vnode allocated at the time of the call.
2293 vm_object_vnode(vm_object_t object)
2297 VM_OBJECT_ASSERT_LOCKED(object);
2298 if (object->type == OBJT_VNODE) {
2299 vp = object->handle;
2300 KASSERT(vp != NULL, ("%s: OBJT_VNODE has no vnode", __func__));
2301 } else if (object->type == OBJT_SWAP &&
2302 (object->flags & OBJ_TMPFS) != 0) {
2303 vp = object->un_pager.swp.swp_tmpfs;
2304 KASSERT(vp != NULL, ("%s: OBJT_TMPFS has no vnode", __func__));
2312 * Return the kvme type of the given object.
2313 * If vpp is not NULL, set it to the object's vm_object_vnode() or NULL.
2316 vm_object_kvme_type(vm_object_t object, struct vnode **vpp)
2319 VM_OBJECT_ASSERT_LOCKED(object);
2321 *vpp = vm_object_vnode(object);
2322 switch (object->type) {
2324 return (KVME_TYPE_DEFAULT);
2326 return (KVME_TYPE_VNODE);
2328 if ((object->flags & OBJ_TMPFS_NODE) != 0)
2329 return (KVME_TYPE_VNODE);
2330 return (KVME_TYPE_SWAP);
2332 return (KVME_TYPE_DEVICE);
2334 return (KVME_TYPE_PHYS);
2336 return (KVME_TYPE_DEAD);
2338 return (KVME_TYPE_SG);
2339 case OBJT_MGTDEVICE:
2340 return (KVME_TYPE_MGTDEVICE);
2342 return (KVME_TYPE_UNKNOWN);
2347 sysctl_vm_object_list(SYSCTL_HANDLER_ARGS)
2349 struct kinfo_vmobject *kvo;
2350 char *fullpath, *freepath;
2357 if (req->oldptr == NULL) {
2359 * If an old buffer has not been provided, generate an
2360 * estimate of the space needed for a subsequent call.
2362 mtx_lock(&vm_object_list_mtx);
2364 TAILQ_FOREACH(obj, &vm_object_list, object_list) {
2365 if (obj->type == OBJT_DEAD)
2369 mtx_unlock(&vm_object_list_mtx);
2370 return (SYSCTL_OUT(req, NULL, sizeof(struct kinfo_vmobject) *
2374 kvo = malloc(sizeof(*kvo), M_TEMP, M_WAITOK);
2378 * VM objects are type stable and are never removed from the
2379 * list once added. This allows us to safely read obj->object_list
2380 * after reacquiring the VM object lock.
2382 mtx_lock(&vm_object_list_mtx);
2383 TAILQ_FOREACH(obj, &vm_object_list, object_list) {
2384 if (obj->type == OBJT_DEAD)
2386 VM_OBJECT_RLOCK(obj);
2387 if (obj->type == OBJT_DEAD) {
2388 VM_OBJECT_RUNLOCK(obj);
2391 mtx_unlock(&vm_object_list_mtx);
2392 kvo->kvo_size = ptoa(obj->size);
2393 kvo->kvo_resident = obj->resident_page_count;
2394 kvo->kvo_ref_count = obj->ref_count;
2395 kvo->kvo_shadow_count = obj->shadow_count;
2396 kvo->kvo_memattr = obj->memattr;
2397 kvo->kvo_active = 0;
2398 kvo->kvo_inactive = 0;
2399 TAILQ_FOREACH(m, &obj->memq, listq) {
2401 * A page may belong to the object but be
2402 * dequeued and set to PQ_NONE while the
2403 * object lock is not held. This makes the
2404 * reads of m->queue below racy, and we do not
2405 * count pages set to PQ_NONE. However, this
2406 * sysctl is only meant to give an
2407 * approximation of the system anyway.
2409 if (m->queue == PQ_ACTIVE)
2411 else if (m->queue == PQ_INACTIVE)
2412 kvo->kvo_inactive++;
2415 kvo->kvo_vn_fileid = 0;
2416 kvo->kvo_vn_fsid = 0;
2417 kvo->kvo_vn_fsid_freebsd11 = 0;
2420 kvo->kvo_type = vm_object_kvme_type(obj, &vp);
2423 VM_OBJECT_RUNLOCK(obj);
2425 vn_fullpath(curthread, vp, &fullpath, &freepath);
2426 vn_lock(vp, LK_SHARED | LK_RETRY);
2427 if (VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) {
2428 kvo->kvo_vn_fileid = va.va_fileid;
2429 kvo->kvo_vn_fsid = va.va_fsid;
2430 kvo->kvo_vn_fsid_freebsd11 = va.va_fsid;
2436 strlcpy(kvo->kvo_path, fullpath, sizeof(kvo->kvo_path));
2437 if (freepath != NULL)
2438 free(freepath, M_TEMP);
2440 /* Pack record size down */
2441 kvo->kvo_structsize = offsetof(struct kinfo_vmobject, kvo_path)
2442 + strlen(kvo->kvo_path) + 1;
2443 kvo->kvo_structsize = roundup(kvo->kvo_structsize,
2445 error = SYSCTL_OUT(req, kvo, kvo->kvo_structsize);
2446 mtx_lock(&vm_object_list_mtx);
2450 mtx_unlock(&vm_object_list_mtx);
2454 SYSCTL_PROC(_vm, OID_AUTO, objects, CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_SKIP |
2455 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_object_list, "S,kinfo_vmobject",
2456 "List of VM objects");
2458 #include "opt_ddb.h"
2460 #include <sys/kernel.h>
2462 #include <sys/cons.h>
2464 #include <ddb/ddb.h>
2467 _vm_object_in_map(vm_map_t map, vm_object_t object, vm_map_entry_t entry)
2470 vm_map_entry_t tmpe;
2478 tmpe = map->header.next;
2479 entcount = map->nentries;
2480 while (entcount-- && (tmpe != &map->header)) {
2481 if (_vm_object_in_map(map, object, tmpe)) {
2486 } else if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
2487 tmpm = entry->object.sub_map;
2488 tmpe = tmpm->header.next;
2489 entcount = tmpm->nentries;
2490 while (entcount-- && tmpe != &tmpm->header) {
2491 if (_vm_object_in_map(tmpm, object, tmpe)) {
2496 } else if ((obj = entry->object.vm_object) != NULL) {
2497 for (; obj; obj = obj->backing_object)
2498 if (obj == object) {
2506 vm_object_in_map(vm_object_t object)
2510 /* sx_slock(&allproc_lock); */
2511 FOREACH_PROC_IN_SYSTEM(p) {
2512 if (!p->p_vmspace /* || (p->p_flag & (P_SYSTEM|P_WEXIT)) */)
2514 if (_vm_object_in_map(&p->p_vmspace->vm_map, object, 0)) {
2515 /* sx_sunlock(&allproc_lock); */
2519 /* sx_sunlock(&allproc_lock); */
2520 if (_vm_object_in_map(kernel_map, object, 0))
2525 DB_SHOW_COMMAND(vmochk, vm_object_check)
2530 * make sure that internal objs are in a map somewhere
2531 * and none have zero ref counts.
2533 TAILQ_FOREACH(object, &vm_object_list, object_list) {
2534 if (object->handle == NULL &&
2535 (object->type == OBJT_DEFAULT || object->type == OBJT_SWAP)) {
2536 if (object->ref_count == 0) {
2537 db_printf("vmochk: internal obj has zero ref count: %ld\n",
2538 (long)object->size);
2540 if (!vm_object_in_map(object)) {
2542 "vmochk: internal obj is not in a map: "
2543 "ref: %d, size: %lu: 0x%lx, backing_object: %p\n",
2544 object->ref_count, (u_long)object->size,
2545 (u_long)object->size,
2546 (void *)object->backing_object);
2553 * vm_object_print: [ debug ]
2555 DB_SHOW_COMMAND(object, vm_object_print_static)
2557 /* XXX convert args. */
2558 vm_object_t object = (vm_object_t)addr;
2559 boolean_t full = have_addr;
2563 /* XXX count is an (unused) arg. Avoid shadowing it. */
2564 #define count was_count
2572 "Object %p: type=%d, size=0x%jx, res=%d, ref=%d, flags=0x%x ruid %d charge %jx\n",
2573 object, (int)object->type, (uintmax_t)object->size,
2574 object->resident_page_count, object->ref_count, object->flags,
2575 object->cred ? object->cred->cr_ruid : -1, (uintmax_t)object->charge);
2576 db_iprintf(" sref=%d, backing_object(%d)=(%p)+0x%jx\n",
2577 object->shadow_count,
2578 object->backing_object ? object->backing_object->ref_count : 0,
2579 object->backing_object, (uintmax_t)object->backing_object_offset);
2586 TAILQ_FOREACH(p, &object->memq, listq) {
2588 db_iprintf("memory:=");
2589 else if (count == 6) {
2597 db_printf("(off=0x%jx,page=0x%jx)",
2598 (uintmax_t)p->pindex, (uintmax_t)VM_PAGE_TO_PHYS(p));
2608 /* XXX need this non-static entry for calling from vm_map_print. */
2611 /* db_expr_t */ long addr,
2612 boolean_t have_addr,
2613 /* db_expr_t */ long count,
2616 vm_object_print_static(addr, have_addr, count, modif);
2619 DB_SHOW_COMMAND(vmopag, vm_object_print_pages)
2624 vm_page_t m, prev_m;
2628 TAILQ_FOREACH(object, &vm_object_list, object_list) {
2629 db_printf("new object: %p\n", (void *)object);
2640 TAILQ_FOREACH(m, &object->memq, listq) {
2641 if (m->pindex > 128)
2643 if ((prev_m = TAILQ_PREV(m, pglist, listq)) != NULL &&
2644 prev_m->pindex + 1 != m->pindex) {
2646 db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
2647 (long)fidx, rcount, (long)pa);
2659 (VM_PAGE_TO_PHYS(m) == pa + rcount * PAGE_SIZE)) {
2664 db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
2665 (long)fidx, rcount, (long)pa);
2675 pa = VM_PAGE_TO_PHYS(m);
2679 db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
2680 (long)fidx, rcount, (long)pa);