2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * from: @(#)vm_object.c 8.5 (Berkeley) 3/22/94
35 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
36 * All rights reserved.
38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
40 * Permission to use, copy, modify and distribute this software and
41 * its documentation is hereby granted, provided that both the copyright
42 * notice and this permission notice appear in all copies of the
43 * software, derivative works or modified versions, and any portions
44 * thereof, and that both notices appear in supporting documentation.
46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
50 * Carnegie Mellon requests users of this software to return to
52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
53 * School of Computer Science
54 * Carnegie Mellon University
55 * Pittsburgh PA 15213-3890
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
62 * Virtual memory object module.
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD$");
70 #include <sys/param.h>
71 #include <sys/systm.h>
74 #include <sys/mount.h>
75 #include <sys/kernel.h>
76 #include <sys/sysctl.h>
77 #include <sys/mutex.h>
78 #include <sys/proc.h> /* for curproc, pageproc */
79 #include <sys/socket.h>
80 #include <sys/resourcevar.h>
81 #include <sys/rwlock.h>
83 #include <sys/vnode.h>
84 #include <sys/vmmeter.h>
88 #include <vm/vm_param.h>
90 #include <vm/vm_map.h>
91 #include <vm/vm_object.h>
92 #include <vm/vm_page.h>
93 #include <vm/vm_pageout.h>
94 #include <vm/vm_pager.h>
95 #include <vm/swap_pager.h>
96 #include <vm/vm_kern.h>
97 #include <vm/vm_extern.h>
98 #include <vm/vm_radix.h>
99 #include <vm/vm_reserv.h>
102 static int old_msync;
103 SYSCTL_INT(_vm, OID_AUTO, old_msync, CTLFLAG_RW, &old_msync, 0,
104 "Use old (insecure) msync behavior");
106 static int vm_object_page_collect_flush(vm_object_t object, vm_page_t p,
107 int pagerflags, int flags, boolean_t *clearobjflags,
109 static boolean_t vm_object_page_remove_write(vm_page_t p, int flags,
110 boolean_t *clearobjflags);
111 static void vm_object_qcollapse(vm_object_t object);
112 static void vm_object_vndeallocate(vm_object_t object);
115 * Virtual memory objects maintain the actual data
116 * associated with allocated virtual memory. A given
117 * page of memory exists within exactly one object.
119 * An object is only deallocated when all "references"
120 * are given up. Only one "reference" to a given
121 * region of an object should be writeable.
123 * Associated with each object is a list of all resident
124 * memory pages belonging to that object; this list is
125 * maintained by the "vm_page" module, and locked by the object's
128 * Each object also records a "pager" routine which is
129 * used to retrieve (and store) pages to the proper backing
130 * storage. In addition, objects may be backed by other
131 * objects from which they were virtual-copied.
133 * The only items within the object structure which are
134 * modified after time of creation are:
135 * reference count locked by object's lock
136 * pager routine locked by object's lock
140 struct object_q vm_object_list;
141 struct mtx vm_object_list_mtx; /* lock for object list and count */
143 struct vm_object kernel_object_store;
144 struct vm_object kmem_object_store;
146 static SYSCTL_NODE(_vm_stats, OID_AUTO, object, CTLFLAG_RD, 0,
149 static long object_collapses;
150 SYSCTL_LONG(_vm_stats_object, OID_AUTO, collapses, CTLFLAG_RD,
151 &object_collapses, 0, "VM object collapses");
153 static long object_bypasses;
154 SYSCTL_LONG(_vm_stats_object, OID_AUTO, bypasses, CTLFLAG_RD,
155 &object_bypasses, 0, "VM object bypasses");
157 static uma_zone_t obj_zone;
159 static int vm_object_zinit(void *mem, int size, int flags);
162 static void vm_object_zdtor(void *mem, int size, void *arg);
165 vm_object_zdtor(void *mem, int size, void *arg)
169 object = (vm_object_t)mem;
170 KASSERT(object->ref_count == 0,
171 ("object %p ref_count = %d", object, object->ref_count));
172 KASSERT(TAILQ_EMPTY(&object->memq),
173 ("object %p has resident pages in its memq", object));
174 KASSERT(vm_radix_is_empty(&object->rtree),
175 ("object %p has resident pages in its trie", object));
176 #if VM_NRESERVLEVEL > 0
177 KASSERT(LIST_EMPTY(&object->rvq),
178 ("object %p has reservations",
181 KASSERT(vm_object_cache_is_empty(object),
182 ("object %p has cached pages",
184 KASSERT(object->paging_in_progress == 0,
185 ("object %p paging_in_progress = %d",
186 object, object->paging_in_progress));
187 KASSERT(object->resident_page_count == 0,
188 ("object %p resident_page_count = %d",
189 object, object->resident_page_count));
190 KASSERT(object->shadow_count == 0,
191 ("object %p shadow_count = %d",
192 object, object->shadow_count));
193 KASSERT(object->type == OBJT_DEAD,
194 ("object %p has non-dead type %d",
195 object, object->type));
200 vm_object_zinit(void *mem, int size, int flags)
204 object = (vm_object_t)mem;
205 rw_init_flags(&object->lock, "vm object", RW_DUPOK | RW_NEW);
207 /* These are true for any object that has been freed */
208 object->type = OBJT_DEAD;
209 object->ref_count = 0;
210 object->rtree.rt_root = 0;
211 object->rtree.rt_flags = 0;
212 object->paging_in_progress = 0;
213 object->resident_page_count = 0;
214 object->shadow_count = 0;
215 object->cache.rt_root = 0;
216 object->cache.rt_flags = 0;
218 mtx_lock(&vm_object_list_mtx);
219 TAILQ_INSERT_TAIL(&vm_object_list, object, object_list);
220 mtx_unlock(&vm_object_list_mtx);
225 _vm_object_allocate(objtype_t type, vm_pindex_t size, vm_object_t object)
228 TAILQ_INIT(&object->memq);
229 LIST_INIT(&object->shadow_head);
234 panic("_vm_object_allocate: can't create OBJT_DEAD");
237 object->flags = OBJ_ONEMAPPING;
241 object->flags = OBJ_FICTITIOUS | OBJ_UNMANAGED;
244 object->flags = OBJ_FICTITIOUS;
247 object->flags = OBJ_UNMANAGED;
253 panic("_vm_object_allocate: type %d is undefined", type);
256 object->generation = 1;
257 object->ref_count = 1;
258 object->memattr = VM_MEMATTR_DEFAULT;
261 object->handle = NULL;
262 object->backing_object = NULL;
263 object->backing_object_offset = (vm_ooffset_t) 0;
264 #if VM_NRESERVLEVEL > 0
265 LIST_INIT(&object->rvq);
267 umtx_shm_object_init(object);
273 * Initialize the VM objects module.
278 TAILQ_INIT(&vm_object_list);
279 mtx_init(&vm_object_list_mtx, "vm object_list", NULL, MTX_DEF);
281 rw_init(&kernel_object->lock, "kernel vm object");
282 _vm_object_allocate(OBJT_PHYS, OFF_TO_IDX(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS),
284 #if VM_NRESERVLEVEL > 0
285 kernel_object->flags |= OBJ_COLORED;
286 kernel_object->pg_color = (u_short)atop(VM_MIN_KERNEL_ADDRESS);
289 rw_init(&kmem_object->lock, "kmem vm object");
290 _vm_object_allocate(OBJT_PHYS, OFF_TO_IDX(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS),
292 #if VM_NRESERVLEVEL > 0
293 kmem_object->flags |= OBJ_COLORED;
294 kmem_object->pg_color = (u_short)atop(VM_MIN_KERNEL_ADDRESS);
298 * The lock portion of struct vm_object must be type stable due
299 * to vm_pageout_fallback_object_lock locking a vm object
300 * without holding any references to it.
302 obj_zone = uma_zcreate("VM OBJECT", sizeof (struct vm_object), NULL,
308 vm_object_zinit, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
314 vm_object_clear_flag(vm_object_t object, u_short bits)
317 VM_OBJECT_ASSERT_WLOCKED(object);
318 object->flags &= ~bits;
322 * Sets the default memory attribute for the specified object. Pages
323 * that are allocated to this object are by default assigned this memory
326 * Presently, this function must be called before any pages are allocated
327 * to the object. In the future, this requirement may be relaxed for
328 * "default" and "swap" objects.
331 vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr)
334 VM_OBJECT_ASSERT_WLOCKED(object);
335 switch (object->type) {
343 if (!TAILQ_EMPTY(&object->memq))
344 return (KERN_FAILURE);
347 return (KERN_INVALID_ARGUMENT);
349 panic("vm_object_set_memattr: object %p is of undefined type",
352 object->memattr = memattr;
353 return (KERN_SUCCESS);
357 vm_object_pip_add(vm_object_t object, short i)
360 VM_OBJECT_ASSERT_WLOCKED(object);
361 object->paging_in_progress += i;
365 vm_object_pip_subtract(vm_object_t object, short i)
368 VM_OBJECT_ASSERT_WLOCKED(object);
369 object->paging_in_progress -= i;
373 vm_object_pip_wakeup(vm_object_t object)
376 VM_OBJECT_ASSERT_WLOCKED(object);
377 object->paging_in_progress--;
378 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
379 vm_object_clear_flag(object, OBJ_PIPWNT);
385 vm_object_pip_wakeupn(vm_object_t object, short i)
388 VM_OBJECT_ASSERT_WLOCKED(object);
390 object->paging_in_progress -= i;
391 if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
392 vm_object_clear_flag(object, OBJ_PIPWNT);
398 vm_object_pip_wait(vm_object_t object, char *waitid)
401 VM_OBJECT_ASSERT_WLOCKED(object);
402 while (object->paging_in_progress) {
403 object->flags |= OBJ_PIPWNT;
404 VM_OBJECT_SLEEP(object, object, PVM, waitid, 0);
409 * vm_object_allocate:
411 * Returns a new object with the given size.
414 vm_object_allocate(objtype_t type, vm_pindex_t size)
418 object = (vm_object_t)uma_zalloc(obj_zone, M_WAITOK);
419 _vm_object_allocate(type, size, object);
425 * vm_object_reference:
427 * Gets another reference to the given object. Note: OBJ_DEAD
428 * objects can be referenced during final cleaning.
431 vm_object_reference(vm_object_t object)
435 VM_OBJECT_WLOCK(object);
436 vm_object_reference_locked(object);
437 VM_OBJECT_WUNLOCK(object);
441 * vm_object_reference_locked:
443 * Gets another reference to the given object.
445 * The object must be locked.
448 vm_object_reference_locked(vm_object_t object)
452 VM_OBJECT_ASSERT_WLOCKED(object);
454 if (object->type == OBJT_VNODE) {
461 * Handle deallocating an object of type OBJT_VNODE.
464 vm_object_vndeallocate(vm_object_t object)
466 struct vnode *vp = (struct vnode *) object->handle;
468 VM_OBJECT_ASSERT_WLOCKED(object);
469 KASSERT(object->type == OBJT_VNODE,
470 ("vm_object_vndeallocate: not a vnode object"));
471 KASSERT(vp != NULL, ("vm_object_vndeallocate: missing vp"));
473 if (object->ref_count == 0) {
474 vprint("vm_object_vndeallocate", vp);
475 panic("vm_object_vndeallocate: bad object reference count");
479 if (!umtx_shm_vnobj_persistent && object->ref_count == 1)
480 umtx_shm_object_terminated(object);
483 * The test for text of vp vnode does not need a bypass to
484 * reach right VV_TEXT there, since it is obtained from
487 if (object->ref_count > 1 || (vp->v_vflag & VV_TEXT) == 0) {
489 VM_OBJECT_WUNLOCK(object);
490 /* vrele may need the vnode lock. */
494 VM_OBJECT_WUNLOCK(object);
495 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
497 VM_OBJECT_WLOCK(object);
499 if (object->type == OBJT_DEAD) {
500 VM_OBJECT_WUNLOCK(object);
503 if (object->ref_count == 0)
505 VM_OBJECT_WUNLOCK(object);
512 * vm_object_deallocate:
514 * Release a reference to the specified object,
515 * gained either through a vm_object_allocate
516 * or a vm_object_reference call. When all references
517 * are gone, storage associated with this object
518 * may be relinquished.
520 * No object may be locked.
523 vm_object_deallocate(vm_object_t object)
528 while (object != NULL) {
529 VM_OBJECT_WLOCK(object);
530 if (object->type == OBJT_VNODE) {
531 vm_object_vndeallocate(object);
535 KASSERT(object->ref_count != 0,
536 ("vm_object_deallocate: object deallocated too many times: %d", object->type));
539 * If the reference count goes to 0 we start calling
540 * vm_object_terminate() on the object chain.
541 * A ref count of 1 may be a special case depending on the
542 * shadow count being 0 or 1.
545 if (object->ref_count > 1) {
546 VM_OBJECT_WUNLOCK(object);
548 } else if (object->ref_count == 1) {
549 if (object->type == OBJT_SWAP &&
550 (object->flags & OBJ_TMPFS) != 0) {
551 vp = object->un_pager.swp.swp_tmpfs;
553 VM_OBJECT_WUNLOCK(object);
554 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
555 VM_OBJECT_WLOCK(object);
556 if (object->type == OBJT_DEAD ||
557 object->ref_count != 1) {
558 VM_OBJECT_WUNLOCK(object);
563 if ((object->flags & OBJ_TMPFS) != 0)
568 if (object->shadow_count == 0 &&
569 object->handle == NULL &&
570 (object->type == OBJT_DEFAULT ||
571 (object->type == OBJT_SWAP &&
572 (object->flags & OBJ_TMPFS_NODE) == 0))) {
573 vm_object_set_flag(object, OBJ_ONEMAPPING);
574 } else if ((object->shadow_count == 1) &&
575 (object->handle == NULL) &&
576 (object->type == OBJT_DEFAULT ||
577 object->type == OBJT_SWAP)) {
580 robject = LIST_FIRST(&object->shadow_head);
581 KASSERT(robject != NULL,
582 ("vm_object_deallocate: ref_count: %d, shadow_count: %d",
584 object->shadow_count));
585 KASSERT((robject->flags & OBJ_TMPFS_NODE) == 0,
586 ("shadowed tmpfs v_object %p", object));
587 if (!VM_OBJECT_TRYWLOCK(robject)) {
589 * Avoid a potential deadlock.
592 VM_OBJECT_WUNLOCK(object);
594 * More likely than not the thread
595 * holding robject's lock has lower
596 * priority than the current thread.
597 * Let the lower priority thread run.
603 * Collapse object into its shadow unless its
604 * shadow is dead. In that case, object will
605 * be deallocated by the thread that is
606 * deallocating its shadow.
608 if ((robject->flags & OBJ_DEAD) == 0 &&
609 (robject->handle == NULL) &&
610 (robject->type == OBJT_DEFAULT ||
611 robject->type == OBJT_SWAP)) {
613 robject->ref_count++;
615 if (robject->paging_in_progress) {
616 VM_OBJECT_WUNLOCK(object);
617 vm_object_pip_wait(robject,
619 temp = robject->backing_object;
620 if (object == temp) {
621 VM_OBJECT_WLOCK(object);
624 } else if (object->paging_in_progress) {
625 VM_OBJECT_WUNLOCK(robject);
626 object->flags |= OBJ_PIPWNT;
627 VM_OBJECT_SLEEP(object, object,
628 PDROP | PVM, "objde2", 0);
629 VM_OBJECT_WLOCK(robject);
630 temp = robject->backing_object;
631 if (object == temp) {
632 VM_OBJECT_WLOCK(object);
636 VM_OBJECT_WUNLOCK(object);
638 if (robject->ref_count == 1) {
639 robject->ref_count--;
644 vm_object_collapse(object);
645 VM_OBJECT_WUNLOCK(object);
648 VM_OBJECT_WUNLOCK(robject);
650 VM_OBJECT_WUNLOCK(object);
654 umtx_shm_object_terminated(object);
655 temp = object->backing_object;
657 KASSERT((object->flags & OBJ_TMPFS_NODE) == 0,
658 ("shadowed tmpfs v_object 2 %p", object));
659 VM_OBJECT_WLOCK(temp);
660 LIST_REMOVE(object, shadow_list);
661 temp->shadow_count--;
662 VM_OBJECT_WUNLOCK(temp);
663 object->backing_object = NULL;
666 * Don't double-terminate, we could be in a termination
667 * recursion due to the terminate having to sync data
670 if ((object->flags & OBJ_DEAD) == 0)
671 vm_object_terminate(object);
673 VM_OBJECT_WUNLOCK(object);
679 * vm_object_destroy removes the object from the global object list
680 * and frees the space for the object.
683 vm_object_destroy(vm_object_t object)
687 * Release the allocation charge.
689 if (object->cred != NULL) {
690 swap_release_by_cred(object->charge, object->cred);
692 crfree(object->cred);
697 * Free the space for the object.
699 uma_zfree(obj_zone, object);
703 * vm_object_terminate actually destroys the specified object, freeing
704 * up all previously used resources.
706 * The object must be locked.
707 * This routine may block.
710 vm_object_terminate(vm_object_t object)
714 VM_OBJECT_ASSERT_WLOCKED(object);
717 * Make sure no one uses us.
719 vm_object_set_flag(object, OBJ_DEAD);
722 * wait for the pageout daemon to be done with the object
724 vm_object_pip_wait(object, "objtrm");
726 KASSERT(!object->paging_in_progress,
727 ("vm_object_terminate: pageout in progress"));
730 * Clean and free the pages, as appropriate. All references to the
731 * object are gone, so we don't need to lock it.
733 if (object->type == OBJT_VNODE) {
734 struct vnode *vp = (struct vnode *)object->handle;
737 * Clean pages and flush buffers.
739 vm_object_page_clean(object, 0, 0, OBJPC_SYNC);
740 VM_OBJECT_WUNLOCK(object);
742 vinvalbuf(vp, V_SAVE, 0, 0);
744 VM_OBJECT_WLOCK(object);
747 KASSERT(object->ref_count == 0,
748 ("vm_object_terminate: object with references, ref_count=%d",
752 * Free any remaining pageable pages. This also removes them from the
753 * paging queues. However, don't free wired pages, just remove them
754 * from the object. Rather than incrementally removing each page from
755 * the object, the page and object are reset to any empty state.
757 TAILQ_FOREACH_SAFE(p, &object->memq, listq, p_next) {
758 vm_page_assert_unbusied(p);
761 * Optimize the page's removal from the object by resetting
762 * its "object" field. Specifically, if the page is not
763 * wired, then the effect of this assignment is that
764 * vm_page_free()'s call to vm_page_remove() will return
765 * immediately without modifying the page or the object.
768 if (p->wire_count == 0) {
770 PCPU_INC(cnt.v_pfree);
775 * If the object contained any pages, then reset it to an empty state.
776 * None of the object's fields, including "resident_page_count", were
777 * modified by the preceding loop.
779 if (object->resident_page_count != 0) {
780 vm_radix_reclaim_allnodes(&object->rtree);
781 TAILQ_INIT(&object->memq);
782 object->resident_page_count = 0;
783 if (object->type == OBJT_VNODE)
784 vdrop(object->handle);
787 #if VM_NRESERVLEVEL > 0
788 if (__predict_false(!LIST_EMPTY(&object->rvq)))
789 vm_reserv_break_all(object);
791 if (__predict_false(!vm_object_cache_is_empty(object)))
792 vm_page_cache_free(object, 0, 0);
794 KASSERT(object->cred == NULL || object->type == OBJT_DEFAULT ||
795 object->type == OBJT_SWAP,
796 ("%s: non-swap obj %p has cred", __func__, object));
799 * Let the pager know object is dead.
801 vm_pager_deallocate(object);
802 VM_OBJECT_WUNLOCK(object);
804 vm_object_destroy(object);
808 * Make the page read-only so that we can clear the object flags. However, if
809 * this is a nosync mmap then the object is likely to stay dirty so do not
810 * mess with the page and do not clear the object flags. Returns TRUE if the
811 * page should be flushed, and FALSE otherwise.
814 vm_object_page_remove_write(vm_page_t p, int flags, boolean_t *clearobjflags)
818 * If we have been asked to skip nosync pages and this is a
819 * nosync page, skip it. Note that the object flags were not
820 * cleared in this case so we do not have to set them.
822 if ((flags & OBJPC_NOSYNC) != 0 && (p->oflags & VPO_NOSYNC) != 0) {
823 *clearobjflags = FALSE;
826 pmap_remove_write(p);
827 return (p->dirty != 0);
832 * vm_object_page_clean
834 * Clean all dirty pages in the specified range of object. Leaves page
835 * on whatever queue it is currently on. If NOSYNC is set then do not
836 * write out pages with VPO_NOSYNC set (originally comes from MAP_NOSYNC),
837 * leaving the object dirty.
839 * When stuffing pages asynchronously, allow clustering. XXX we need a
840 * synchronous clustering mode implementation.
842 * Odd semantics: if start == end, we clean everything.
844 * The object must be locked.
846 * Returns FALSE if some page from the range was not written, as
847 * reported by the pager, and TRUE otherwise.
850 vm_object_page_clean(vm_object_t object, vm_ooffset_t start, vm_ooffset_t end,
854 vm_pindex_t pi, tend, tstart;
855 int curgeneration, n, pagerflags;
856 boolean_t clearobjflags, eio, res;
858 VM_OBJECT_ASSERT_WLOCKED(object);
861 * The OBJ_MIGHTBEDIRTY flag is only set for OBJT_VNODE
862 * objects. The check below prevents the function from
863 * operating on non-vnode objects.
865 if ((object->flags & OBJ_MIGHTBEDIRTY) == 0 ||
866 object->resident_page_count == 0)
869 pagerflags = (flags & (OBJPC_SYNC | OBJPC_INVAL)) != 0 ?
870 VM_PAGER_PUT_SYNC : VM_PAGER_CLUSTER_OK;
871 pagerflags |= (flags & OBJPC_INVAL) != 0 ? VM_PAGER_PUT_INVAL : 0;
873 tstart = OFF_TO_IDX(start);
874 tend = (end == 0) ? object->size : OFF_TO_IDX(end + PAGE_MASK);
875 clearobjflags = tstart == 0 && tend >= object->size;
879 curgeneration = object->generation;
881 for (p = vm_page_find_least(object, tstart); p != NULL; p = np) {
885 np = TAILQ_NEXT(p, listq);
888 if (vm_page_sleep_if_busy(p, "vpcwai")) {
889 if (object->generation != curgeneration) {
890 if ((flags & OBJPC_SYNC) != 0)
893 clearobjflags = FALSE;
895 np = vm_page_find_least(object, pi);
898 if (!vm_object_page_remove_write(p, flags, &clearobjflags))
901 n = vm_object_page_collect_flush(object, p, pagerflags,
902 flags, &clearobjflags, &eio);
905 clearobjflags = FALSE;
907 if (object->generation != curgeneration) {
908 if ((flags & OBJPC_SYNC) != 0)
911 clearobjflags = FALSE;
915 * If the VOP_PUTPAGES() did a truncated write, so
916 * that even the first page of the run is not fully
917 * written, vm_pageout_flush() returns 0 as the run
918 * length. Since the condition that caused truncated
919 * write may be permanent, e.g. exhausted free space,
920 * accepting n == 0 would cause an infinite loop.
922 * Forwarding the iterator leaves the unwritten page
923 * behind, but there is not much we can do there if
924 * filesystem refuses to write it.
928 clearobjflags = FALSE;
930 np = vm_page_find_least(object, pi + n);
933 VOP_FSYNC(vp, (pagerflags & VM_PAGER_PUT_SYNC) ? MNT_WAIT : 0);
937 vm_object_clear_flag(object, OBJ_MIGHTBEDIRTY);
942 vm_object_page_collect_flush(vm_object_t object, vm_page_t p, int pagerflags,
943 int flags, boolean_t *clearobjflags, boolean_t *eio)
945 vm_page_t ma[vm_pageout_page_count], p_first, tp;
946 int count, i, mreq, runlen;
948 vm_page_lock_assert(p, MA_NOTOWNED);
949 VM_OBJECT_ASSERT_WLOCKED(object);
954 for (tp = p; count < vm_pageout_page_count; count++) {
955 tp = vm_page_next(tp);
956 if (tp == NULL || vm_page_busied(tp))
958 if (!vm_object_page_remove_write(tp, flags, clearobjflags))
962 for (p_first = p; count < vm_pageout_page_count; count++) {
963 tp = vm_page_prev(p_first);
964 if (tp == NULL || vm_page_busied(tp))
966 if (!vm_object_page_remove_write(tp, flags, clearobjflags))
972 for (tp = p_first, i = 0; i < count; tp = TAILQ_NEXT(tp, listq), i++)
975 vm_pageout_flush(ma, count, pagerflags, mreq, &runlen, eio);
980 * Note that there is absolutely no sense in writing out
981 * anonymous objects, so we track down the vnode object
983 * We invalidate (remove) all pages from the address space
984 * for semantic correctness.
986 * If the backing object is a device object with unmanaged pages, then any
987 * mappings to the specified range of pages must be removed before this
988 * function is called.
990 * Note: certain anonymous maps, such as MAP_NOSYNC maps,
991 * may start out with a NULL object.
994 vm_object_sync(vm_object_t object, vm_ooffset_t offset, vm_size_t size,
995 boolean_t syncio, boolean_t invalidate)
997 vm_object_t backing_object;
1000 int error, flags, fsync_after;
1007 VM_OBJECT_WLOCK(object);
1008 while ((backing_object = object->backing_object) != NULL) {
1009 VM_OBJECT_WLOCK(backing_object);
1010 offset += object->backing_object_offset;
1011 VM_OBJECT_WUNLOCK(object);
1012 object = backing_object;
1013 if (object->size < OFF_TO_IDX(offset + size))
1014 size = IDX_TO_OFF(object->size) - offset;
1017 * Flush pages if writing is allowed, invalidate them
1018 * if invalidation requested. Pages undergoing I/O
1019 * will be ignored by vm_object_page_remove().
1021 * We cannot lock the vnode and then wait for paging
1022 * to complete without deadlocking against vm_fault.
1023 * Instead we simply call vm_object_page_remove() and
1024 * allow it to block internally on a page-by-page
1025 * basis when it encounters pages undergoing async
1028 if (object->type == OBJT_VNODE &&
1029 (object->flags & OBJ_MIGHTBEDIRTY) != 0) {
1030 vp = object->handle;
1031 VM_OBJECT_WUNLOCK(object);
1032 (void) vn_start_write(vp, &mp, V_WAIT);
1033 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1034 if (syncio && !invalidate && offset == 0 &&
1035 OFF_TO_IDX(size) == object->size) {
1037 * If syncing the whole mapping of the file,
1038 * it is faster to schedule all the writes in
1039 * async mode, also allowing the clustering,
1040 * and then wait for i/o to complete.
1045 flags = (syncio || invalidate) ? OBJPC_SYNC : 0;
1046 flags |= invalidate ? (OBJPC_SYNC | OBJPC_INVAL) : 0;
1047 fsync_after = FALSE;
1049 VM_OBJECT_WLOCK(object);
1050 res = vm_object_page_clean(object, offset, offset + size,
1052 VM_OBJECT_WUNLOCK(object);
1054 error = VOP_FSYNC(vp, MNT_WAIT, curthread);
1056 vn_finished_write(mp);
1059 VM_OBJECT_WLOCK(object);
1061 if ((object->type == OBJT_VNODE ||
1062 object->type == OBJT_DEVICE) && invalidate) {
1063 if (object->type == OBJT_DEVICE)
1065 * The option OBJPR_NOTMAPPED must be passed here
1066 * because vm_object_page_remove() cannot remove
1067 * unmanaged mappings.
1069 flags = OBJPR_NOTMAPPED;
1073 flags = OBJPR_CLEANONLY;
1074 vm_object_page_remove(object, OFF_TO_IDX(offset),
1075 OFF_TO_IDX(offset + size + PAGE_MASK), flags);
1077 VM_OBJECT_WUNLOCK(object);
1082 * vm_object_madvise:
1084 * Implements the madvise function at the object/page level.
1086 * MADV_WILLNEED (any object)
1088 * Activate the specified pages if they are resident.
1090 * MADV_DONTNEED (any object)
1092 * Deactivate the specified pages if they are resident.
1094 * MADV_FREE (OBJT_DEFAULT/OBJT_SWAP objects,
1095 * OBJ_ONEMAPPING only)
1097 * Deactivate and clean the specified pages if they are
1098 * resident. This permits the process to reuse the pages
1099 * without faulting or the kernel to reclaim the pages
1103 vm_object_madvise(vm_object_t object, vm_pindex_t pindex, vm_pindex_t end,
1106 vm_pindex_t tpindex;
1107 vm_object_t backing_object, tobject;
1112 VM_OBJECT_WLOCK(object);
1114 * Locate and adjust resident pages
1116 for (; pindex < end; pindex += 1) {
1122 * MADV_FREE only operates on OBJT_DEFAULT or OBJT_SWAP pages
1123 * and those pages must be OBJ_ONEMAPPING.
1125 if (advise == MADV_FREE) {
1126 if ((tobject->type != OBJT_DEFAULT &&
1127 tobject->type != OBJT_SWAP) ||
1128 (tobject->flags & OBJ_ONEMAPPING) == 0) {
1129 goto unlock_tobject;
1131 } else if ((tobject->flags & OBJ_UNMANAGED) != 0)
1132 goto unlock_tobject;
1133 m = vm_page_lookup(tobject, tpindex);
1134 if (m == NULL && advise == MADV_WILLNEED) {
1136 * If the page is cached, reactivate it.
1138 m = vm_page_alloc(tobject, tpindex, VM_ALLOC_IFCACHED |
1143 * There may be swap even if there is no backing page
1145 if (advise == MADV_FREE && tobject->type == OBJT_SWAP)
1146 swap_pager_freespace(tobject, tpindex, 1);
1150 backing_object = tobject->backing_object;
1151 if (backing_object == NULL)
1152 goto unlock_tobject;
1153 VM_OBJECT_WLOCK(backing_object);
1154 tpindex += OFF_TO_IDX(tobject->backing_object_offset);
1155 if (tobject != object)
1156 VM_OBJECT_WUNLOCK(tobject);
1157 tobject = backing_object;
1159 } else if (m->valid != VM_PAGE_BITS_ALL)
1160 goto unlock_tobject;
1162 * If the page is not in a normal state, skip it.
1165 if (m->hold_count != 0 || m->wire_count != 0) {
1167 goto unlock_tobject;
1169 KASSERT((m->flags & PG_FICTITIOUS) == 0,
1170 ("vm_object_madvise: page %p is fictitious", m));
1171 KASSERT((m->oflags & VPO_UNMANAGED) == 0,
1172 ("vm_object_madvise: page %p is not managed", m));
1173 if (vm_page_busied(m)) {
1174 if (advise == MADV_WILLNEED) {
1176 * Reference the page before unlocking and
1177 * sleeping so that the page daemon is less
1178 * likely to reclaim it.
1180 vm_page_aflag_set(m, PGA_REFERENCED);
1182 if (object != tobject)
1183 VM_OBJECT_WUNLOCK(object);
1184 VM_OBJECT_WUNLOCK(tobject);
1185 vm_page_busy_sleep(m, "madvpo");
1186 VM_OBJECT_WLOCK(object);
1189 if (advise == MADV_WILLNEED) {
1190 vm_page_activate(m);
1192 vm_page_advise(m, advise);
1195 if (advise == MADV_FREE && tobject->type == OBJT_SWAP)
1196 swap_pager_freespace(tobject, tpindex, 1);
1198 if (tobject != object)
1199 VM_OBJECT_WUNLOCK(tobject);
1201 VM_OBJECT_WUNLOCK(object);
1207 * Create a new object which is backed by the
1208 * specified existing object range. The source
1209 * object reference is deallocated.
1211 * The new object and offset into that object
1212 * are returned in the source parameters.
1216 vm_object_t *object, /* IN/OUT */
1217 vm_ooffset_t *offset, /* IN/OUT */
1226 * Don't create the new object if the old object isn't shared.
1228 if (source != NULL) {
1229 VM_OBJECT_WLOCK(source);
1230 if (source->ref_count == 1 &&
1231 source->handle == NULL &&
1232 (source->type == OBJT_DEFAULT ||
1233 source->type == OBJT_SWAP)) {
1234 VM_OBJECT_WUNLOCK(source);
1237 VM_OBJECT_WUNLOCK(source);
1241 * Allocate a new object with the given length.
1243 result = vm_object_allocate(OBJT_DEFAULT, atop(length));
1246 * The new object shadows the source object, adding a reference to it.
1247 * Our caller changes his reference to point to the new object,
1248 * removing a reference to the source object. Net result: no change
1249 * of reference count.
1251 * Try to optimize the result object's page color when shadowing
1252 * in order to maintain page coloring consistency in the combined
1255 result->backing_object = source;
1257 * Store the offset into the source object, and fix up the offset into
1260 result->backing_object_offset = *offset;
1261 if (source != NULL) {
1262 VM_OBJECT_WLOCK(source);
1263 LIST_INSERT_HEAD(&source->shadow_head, result, shadow_list);
1264 source->shadow_count++;
1265 #if VM_NRESERVLEVEL > 0
1266 result->flags |= source->flags & OBJ_COLORED;
1267 result->pg_color = (source->pg_color + OFF_TO_IDX(*offset)) &
1268 ((1 << (VM_NFREEORDER - 1)) - 1);
1270 VM_OBJECT_WUNLOCK(source);
1275 * Return the new things
1284 * Split the pages in a map entry into a new object. This affords
1285 * easier removal of unused pages, and keeps object inheritance from
1286 * being a negative impact on memory usage.
1289 vm_object_split(vm_map_entry_t entry)
1291 vm_page_t m, m_next;
1292 vm_object_t orig_object, new_object, source;
1293 vm_pindex_t idx, offidxstart;
1296 orig_object = entry->object.vm_object;
1297 if (orig_object->type != OBJT_DEFAULT && orig_object->type != OBJT_SWAP)
1299 if (orig_object->ref_count <= 1)
1301 VM_OBJECT_WUNLOCK(orig_object);
1303 offidxstart = OFF_TO_IDX(entry->offset);
1304 size = atop(entry->end - entry->start);
1307 * If swap_pager_copy() is later called, it will convert new_object
1308 * into a swap object.
1310 new_object = vm_object_allocate(OBJT_DEFAULT, size);
1313 * At this point, the new object is still private, so the order in
1314 * which the original and new objects are locked does not matter.
1316 VM_OBJECT_WLOCK(new_object);
1317 VM_OBJECT_WLOCK(orig_object);
1318 source = orig_object->backing_object;
1319 if (source != NULL) {
1320 VM_OBJECT_WLOCK(source);
1321 if ((source->flags & OBJ_DEAD) != 0) {
1322 VM_OBJECT_WUNLOCK(source);
1323 VM_OBJECT_WUNLOCK(orig_object);
1324 VM_OBJECT_WUNLOCK(new_object);
1325 vm_object_deallocate(new_object);
1326 VM_OBJECT_WLOCK(orig_object);
1329 LIST_INSERT_HEAD(&source->shadow_head,
1330 new_object, shadow_list);
1331 source->shadow_count++;
1332 vm_object_reference_locked(source); /* for new_object */
1333 vm_object_clear_flag(source, OBJ_ONEMAPPING);
1334 VM_OBJECT_WUNLOCK(source);
1335 new_object->backing_object_offset =
1336 orig_object->backing_object_offset + entry->offset;
1337 new_object->backing_object = source;
1339 if (orig_object->cred != NULL) {
1340 new_object->cred = orig_object->cred;
1341 crhold(orig_object->cred);
1342 new_object->charge = ptoa(size);
1343 KASSERT(orig_object->charge >= ptoa(size),
1344 ("orig_object->charge < 0"));
1345 orig_object->charge -= ptoa(size);
1348 m = vm_page_find_least(orig_object, offidxstart);
1349 for (; m != NULL && (idx = m->pindex - offidxstart) < size;
1351 m_next = TAILQ_NEXT(m, listq);
1354 * We must wait for pending I/O to complete before we can
1357 * We do not have to VM_PROT_NONE the page as mappings should
1358 * not be changed by this operation.
1360 if (vm_page_busied(m)) {
1361 VM_OBJECT_WUNLOCK(new_object);
1363 VM_OBJECT_WUNLOCK(orig_object);
1364 vm_page_busy_sleep(m, "spltwt");
1365 VM_OBJECT_WLOCK(orig_object);
1366 VM_OBJECT_WLOCK(new_object);
1370 /* vm_page_rename() will handle dirty and cache. */
1371 if (vm_page_rename(m, new_object, idx)) {
1372 VM_OBJECT_WUNLOCK(new_object);
1373 VM_OBJECT_WUNLOCK(orig_object);
1375 VM_OBJECT_WLOCK(orig_object);
1376 VM_OBJECT_WLOCK(new_object);
1379 #if VM_NRESERVLEVEL > 0
1381 * If some of the reservation's allocated pages remain with
1382 * the original object, then transferring the reservation to
1383 * the new object is neither particularly beneficial nor
1384 * particularly harmful as compared to leaving the reservation
1385 * with the original object. If, however, all of the
1386 * reservation's allocated pages are transferred to the new
1387 * object, then transferring the reservation is typically
1388 * beneficial. Determining which of these two cases applies
1389 * would be more costly than unconditionally renaming the
1392 vm_reserv_rename(m, new_object, orig_object, offidxstart);
1394 if (orig_object->type == OBJT_SWAP)
1397 if (orig_object->type == OBJT_SWAP) {
1399 * swap_pager_copy() can sleep, in which case the orig_object's
1400 * and new_object's locks are released and reacquired.
1402 swap_pager_copy(orig_object, new_object, offidxstart, 0);
1403 TAILQ_FOREACH(m, &new_object->memq, listq)
1407 * Transfer any cached pages from orig_object to new_object.
1408 * If swap_pager_copy() found swapped out pages within the
1409 * specified range of orig_object, then it changed
1410 * new_object's type to OBJT_SWAP when it transferred those
1411 * pages to new_object. Otherwise, new_object's type
1412 * should still be OBJT_DEFAULT and orig_object should not
1413 * contain any cached pages within the specified range.
1415 if (__predict_false(!vm_object_cache_is_empty(orig_object)))
1416 vm_page_cache_transfer(orig_object, offidxstart,
1419 VM_OBJECT_WUNLOCK(orig_object);
1420 VM_OBJECT_WUNLOCK(new_object);
1421 entry->object.vm_object = new_object;
1422 entry->offset = 0LL;
1423 vm_object_deallocate(orig_object);
1424 VM_OBJECT_WLOCK(new_object);
1427 #define OBSC_COLLAPSE_NOWAIT 0x0002
1428 #define OBSC_COLLAPSE_WAIT 0x0004
1431 vm_object_collapse_scan_wait(vm_object_t object, vm_page_t p, vm_page_t next,
1434 vm_object_t backing_object;
1436 VM_OBJECT_ASSERT_WLOCKED(object);
1437 backing_object = object->backing_object;
1438 VM_OBJECT_ASSERT_WLOCKED(backing_object);
1440 KASSERT(p == NULL || vm_page_busied(p), ("unbusy page %p", p));
1441 KASSERT(p == NULL || p->object == object || p->object == backing_object,
1442 ("invalid ownership %p %p %p", p, object, backing_object));
1443 if ((op & OBSC_COLLAPSE_NOWAIT) != 0)
1447 VM_OBJECT_WUNLOCK(object);
1448 VM_OBJECT_WUNLOCK(backing_object);
1452 vm_page_busy_sleep(p, "vmocol");
1453 VM_OBJECT_WLOCK(object);
1454 VM_OBJECT_WLOCK(backing_object);
1455 return (TAILQ_FIRST(&backing_object->memq));
1459 vm_object_scan_all_shadowed(vm_object_t object)
1461 vm_object_t backing_object;
1463 vm_pindex_t backing_offset_index, new_pindex;
1465 VM_OBJECT_ASSERT_WLOCKED(object);
1466 VM_OBJECT_ASSERT_WLOCKED(object->backing_object);
1468 backing_object = object->backing_object;
1471 * Initial conditions:
1473 * We do not want to have to test for the existence of cache or swap
1474 * pages in the backing object. XXX but with the new swapper this
1475 * would be pretty easy to do.
1477 if (backing_object->type != OBJT_DEFAULT)
1480 backing_offset_index = OFF_TO_IDX(object->backing_object_offset);
1482 for (p = TAILQ_FIRST(&backing_object->memq); p != NULL;
1483 p = TAILQ_NEXT(p, listq)) {
1484 new_pindex = p->pindex - backing_offset_index;
1487 * Ignore pages outside the parent object's range and outside
1488 * the parent object's mapping of the backing object.
1490 if (p->pindex < backing_offset_index ||
1491 new_pindex >= object->size)
1495 * See if the parent has the page or if the parent's object
1496 * pager has the page. If the parent has the page but the page
1497 * is not valid, the parent's object pager must have the page.
1499 * If this fails, the parent does not completely shadow the
1500 * object and we might as well give up now.
1502 pp = vm_page_lookup(object, new_pindex);
1503 if ((pp == NULL || pp->valid == 0) &&
1504 !vm_pager_has_page(object, new_pindex, NULL, NULL))
1511 vm_object_collapse_scan(vm_object_t object, int op)
1513 vm_object_t backing_object;
1514 vm_page_t next, p, pp;
1515 vm_pindex_t backing_offset_index, new_pindex;
1517 VM_OBJECT_ASSERT_WLOCKED(object);
1518 VM_OBJECT_ASSERT_WLOCKED(object->backing_object);
1520 backing_object = object->backing_object;
1521 backing_offset_index = OFF_TO_IDX(object->backing_object_offset);
1524 * Initial conditions
1526 if ((op & OBSC_COLLAPSE_WAIT) != 0)
1527 vm_object_set_flag(backing_object, OBJ_DEAD);
1532 for (p = TAILQ_FIRST(&backing_object->memq); p != NULL; p = next) {
1533 next = TAILQ_NEXT(p, listq);
1534 new_pindex = p->pindex - backing_offset_index;
1537 * Check for busy page
1539 if (vm_page_busied(p)) {
1540 next = vm_object_collapse_scan_wait(object, p, next, op);
1544 KASSERT(p->object == backing_object,
1545 ("vm_object_collapse_scan: object mismatch"));
1547 if (p->pindex < backing_offset_index ||
1548 new_pindex >= object->size) {
1549 if (backing_object->type == OBJT_SWAP)
1550 swap_pager_freespace(backing_object, p->pindex,
1554 * Page is out of the parent object's range, we can
1555 * simply destroy it.
1558 KASSERT(!pmap_page_is_mapped(p),
1559 ("freeing mapped page %p", p));
1560 if (p->wire_count == 0)
1568 pp = vm_page_lookup(object, new_pindex);
1569 if (pp != NULL && vm_page_busied(pp)) {
1571 * The page in the parent is busy and possibly not
1572 * (yet) valid. Until its state is finalized by the
1573 * busy bit owner, we can't tell whether it shadows the
1574 * original page. Therefore, we must either skip it
1575 * and the original (backing_object) page or wait for
1576 * its state to be finalized.
1578 * This is due to a race with vm_fault() where we must
1579 * unbusy the original (backing_obj) page before we can
1580 * (re)lock the parent. Hence we can get here.
1582 next = vm_object_collapse_scan_wait(object, pp, next,
1587 KASSERT(pp == NULL || pp->valid != 0,
1588 ("unbusy invalid page %p", pp));
1590 if (pp != NULL || vm_pager_has_page(object, new_pindex, NULL,
1593 * The page already exists in the parent OR swap exists
1594 * for this location in the parent. Leave the parent's
1595 * page alone. Destroy the original page from the
1598 if (backing_object->type == OBJT_SWAP)
1599 swap_pager_freespace(backing_object, p->pindex,
1602 KASSERT(!pmap_page_is_mapped(p),
1603 ("freeing mapped page %p", p));
1604 if (p->wire_count == 0)
1613 * Page does not exist in parent, rename the page from the
1614 * backing object to the main object.
1616 * If the page was mapped to a process, it can remain mapped
1617 * through the rename. vm_page_rename() will handle dirty and
1620 if (vm_page_rename(p, object, new_pindex)) {
1621 next = vm_object_collapse_scan_wait(object, NULL, next,
1626 /* Use the old pindex to free the right page. */
1627 if (backing_object->type == OBJT_SWAP)
1628 swap_pager_freespace(backing_object,
1629 new_pindex + backing_offset_index, 1);
1631 #if VM_NRESERVLEVEL > 0
1633 * Rename the reservation.
1635 vm_reserv_rename(p, object, backing_object,
1636 backing_offset_index);
1644 * this version of collapse allows the operation to occur earlier and
1645 * when paging_in_progress is true for an object... This is not a complete
1646 * operation, but should plug 99.9% of the rest of the leaks.
1649 vm_object_qcollapse(vm_object_t object)
1651 vm_object_t backing_object = object->backing_object;
1653 VM_OBJECT_ASSERT_WLOCKED(object);
1654 VM_OBJECT_ASSERT_WLOCKED(backing_object);
1656 if (backing_object->ref_count != 1)
1659 vm_object_collapse_scan(object, OBSC_COLLAPSE_NOWAIT);
1663 * vm_object_collapse:
1665 * Collapse an object with the object backing it.
1666 * Pages in the backing object are moved into the
1667 * parent, and the backing object is deallocated.
1670 vm_object_collapse(vm_object_t object)
1672 vm_object_t backing_object, new_backing_object;
1674 VM_OBJECT_ASSERT_WLOCKED(object);
1678 * Verify that the conditions are right for collapse:
1680 * The object exists and the backing object exists.
1682 if ((backing_object = object->backing_object) == NULL)
1686 * we check the backing object first, because it is most likely
1689 VM_OBJECT_WLOCK(backing_object);
1690 if (backing_object->handle != NULL ||
1691 (backing_object->type != OBJT_DEFAULT &&
1692 backing_object->type != OBJT_SWAP) ||
1693 (backing_object->flags & OBJ_DEAD) ||
1694 object->handle != NULL ||
1695 (object->type != OBJT_DEFAULT &&
1696 object->type != OBJT_SWAP) ||
1697 (object->flags & OBJ_DEAD)) {
1698 VM_OBJECT_WUNLOCK(backing_object);
1702 if (object->paging_in_progress != 0 ||
1703 backing_object->paging_in_progress != 0) {
1704 vm_object_qcollapse(object);
1705 VM_OBJECT_WUNLOCK(backing_object);
1710 * We know that we can either collapse the backing object (if
1711 * the parent is the only reference to it) or (perhaps) have
1712 * the parent bypass the object if the parent happens to shadow
1713 * all the resident pages in the entire backing object.
1715 * This is ignoring pager-backed pages such as swap pages.
1716 * vm_object_collapse_scan fails the shadowing test in this
1719 if (backing_object->ref_count == 1) {
1720 vm_object_pip_add(object, 1);
1721 vm_object_pip_add(backing_object, 1);
1724 * If there is exactly one reference to the backing
1725 * object, we can collapse it into the parent.
1727 vm_object_collapse_scan(object, OBSC_COLLAPSE_WAIT);
1729 #if VM_NRESERVLEVEL > 0
1731 * Break any reservations from backing_object.
1733 if (__predict_false(!LIST_EMPTY(&backing_object->rvq)))
1734 vm_reserv_break_all(backing_object);
1738 * Move the pager from backing_object to object.
1740 if (backing_object->type == OBJT_SWAP) {
1742 * swap_pager_copy() can sleep, in which case
1743 * the backing_object's and object's locks are
1744 * released and reacquired.
1745 * Since swap_pager_copy() is being asked to
1746 * destroy the source, it will change the
1747 * backing_object's type to OBJT_DEFAULT.
1752 OFF_TO_IDX(object->backing_object_offset), TRUE);
1755 * Free any cached pages from backing_object.
1757 if (__predict_false(
1758 !vm_object_cache_is_empty(backing_object)))
1759 vm_page_cache_free(backing_object, 0, 0);
1762 * Object now shadows whatever backing_object did.
1763 * Note that the reference to
1764 * backing_object->backing_object moves from within
1765 * backing_object to within object.
1767 LIST_REMOVE(object, shadow_list);
1768 backing_object->shadow_count--;
1769 if (backing_object->backing_object) {
1770 VM_OBJECT_WLOCK(backing_object->backing_object);
1771 LIST_REMOVE(backing_object, shadow_list);
1773 &backing_object->backing_object->shadow_head,
1774 object, shadow_list);
1776 * The shadow_count has not changed.
1778 VM_OBJECT_WUNLOCK(backing_object->backing_object);
1780 object->backing_object = backing_object->backing_object;
1781 object->backing_object_offset +=
1782 backing_object->backing_object_offset;
1785 * Discard backing_object.
1787 * Since the backing object has no pages, no pager left,
1788 * and no object references within it, all that is
1789 * necessary is to dispose of it.
1791 KASSERT(backing_object->ref_count == 1, (
1792 "backing_object %p was somehow re-referenced during collapse!",
1794 vm_object_pip_wakeup(backing_object);
1795 backing_object->type = OBJT_DEAD;
1796 backing_object->ref_count = 0;
1797 VM_OBJECT_WUNLOCK(backing_object);
1798 vm_object_destroy(backing_object);
1800 vm_object_pip_wakeup(object);
1804 * If we do not entirely shadow the backing object,
1805 * there is nothing we can do so we give up.
1807 if (object->resident_page_count != object->size &&
1808 !vm_object_scan_all_shadowed(object)) {
1809 VM_OBJECT_WUNLOCK(backing_object);
1814 * Make the parent shadow the next object in the
1815 * chain. Deallocating backing_object will not remove
1816 * it, since its reference count is at least 2.
1818 LIST_REMOVE(object, shadow_list);
1819 backing_object->shadow_count--;
1821 new_backing_object = backing_object->backing_object;
1822 if ((object->backing_object = new_backing_object) != NULL) {
1823 VM_OBJECT_WLOCK(new_backing_object);
1825 &new_backing_object->shadow_head,
1829 new_backing_object->shadow_count++;
1830 vm_object_reference_locked(new_backing_object);
1831 VM_OBJECT_WUNLOCK(new_backing_object);
1832 object->backing_object_offset +=
1833 backing_object->backing_object_offset;
1837 * Drop the reference count on backing_object. Since
1838 * its ref_count was at least 2, it will not vanish.
1840 backing_object->ref_count--;
1841 VM_OBJECT_WUNLOCK(backing_object);
1846 * Try again with this object's new backing object.
1852 * vm_object_page_remove:
1854 * For the given object, either frees or invalidates each of the
1855 * specified pages. In general, a page is freed. However, if a page is
1856 * wired for any reason other than the existence of a managed, wired
1857 * mapping, then it may be invalidated but not removed from the object.
1858 * Pages are specified by the given range ["start", "end") and the option
1859 * OBJPR_CLEANONLY. As a special case, if "end" is zero, then the range
1860 * extends from "start" to the end of the object. If the option
1861 * OBJPR_CLEANONLY is specified, then only the non-dirty pages within the
1862 * specified range are affected. If the option OBJPR_NOTMAPPED is
1863 * specified, then the pages within the specified range must have no
1864 * mappings. Otherwise, if this option is not specified, any mappings to
1865 * the specified pages are removed before the pages are freed or
1868 * In general, this operation should only be performed on objects that
1869 * contain managed pages. There are, however, two exceptions. First, it
1870 * is performed on the kernel and kmem objects by vm_map_entry_delete().
1871 * Second, it is used by msync(..., MS_INVALIDATE) to invalidate device-
1872 * backed pages. In both of these cases, the option OBJPR_CLEANONLY must
1873 * not be specified and the option OBJPR_NOTMAPPED must be specified.
1875 * The object must be locked.
1878 vm_object_page_remove(vm_object_t object, vm_pindex_t start, vm_pindex_t end,
1883 VM_OBJECT_ASSERT_WLOCKED(object);
1884 KASSERT((object->flags & OBJ_UNMANAGED) == 0 ||
1885 (options & (OBJPR_CLEANONLY | OBJPR_NOTMAPPED)) == OBJPR_NOTMAPPED,
1886 ("vm_object_page_remove: illegal options for object %p", object));
1887 if (object->resident_page_count == 0)
1889 vm_object_pip_add(object, 1);
1891 p = vm_page_find_least(object, start);
1894 * Here, the variable "p" is either (1) the page with the least pindex
1895 * greater than or equal to the parameter "start" or (2) NULL.
1897 for (; p != NULL && (p->pindex < end || end == 0); p = next) {
1898 next = TAILQ_NEXT(p, listq);
1901 * If the page is wired for any reason besides the existence
1902 * of managed, wired mappings, then it cannot be freed. For
1903 * example, fictitious pages, which represent device memory,
1904 * are inherently wired and cannot be freed. They can,
1905 * however, be invalidated if the option OBJPR_CLEANONLY is
1909 if (vm_page_xbusied(p)) {
1910 VM_OBJECT_WUNLOCK(object);
1911 vm_page_busy_sleep(p, "vmopax");
1912 VM_OBJECT_WLOCK(object);
1915 if (p->wire_count != 0) {
1916 if ((options & OBJPR_NOTMAPPED) == 0)
1918 if ((options & OBJPR_CLEANONLY) == 0) {
1924 if (vm_page_busied(p)) {
1925 VM_OBJECT_WUNLOCK(object);
1926 vm_page_busy_sleep(p, "vmopar");
1927 VM_OBJECT_WLOCK(object);
1930 KASSERT((p->flags & PG_FICTITIOUS) == 0,
1931 ("vm_object_page_remove: page %p is fictitious", p));
1932 if ((options & OBJPR_CLEANONLY) != 0 && p->valid != 0) {
1933 if ((options & OBJPR_NOTMAPPED) == 0)
1934 pmap_remove_write(p);
1938 if ((options & OBJPR_NOTMAPPED) == 0)
1944 vm_object_pip_wakeup(object);
1946 if (__predict_false(!vm_object_cache_is_empty(object)))
1947 vm_page_cache_free(object, start, end);
1951 * vm_object_page_noreuse:
1953 * For the given object, attempt to move the specified pages to
1954 * the head of the inactive queue. This bypasses regular LRU
1955 * operation and allows the pages to be reused quickly under memory
1956 * pressure. If a page is wired for any reason, then it will not
1957 * be queued. Pages are specified by the range ["start", "end").
1958 * As a special case, if "end" is zero, then the range extends from
1959 * "start" to the end of the object.
1961 * This operation should only be performed on objects that
1962 * contain non-fictitious, managed pages.
1964 * The object must be locked.
1967 vm_object_page_noreuse(vm_object_t object, vm_pindex_t start, vm_pindex_t end)
1969 struct mtx *mtx, *new_mtx;
1972 VM_OBJECT_ASSERT_WLOCKED(object);
1973 KASSERT((object->flags & (OBJ_FICTITIOUS | OBJ_UNMANAGED)) == 0,
1974 ("vm_object_page_noreuse: illegal object %p", object));
1975 if (object->resident_page_count == 0)
1977 p = vm_page_find_least(object, start);
1980 * Here, the variable "p" is either (1) the page with the least pindex
1981 * greater than or equal to the parameter "start" or (2) NULL.
1984 for (; p != NULL && (p->pindex < end || end == 0); p = next) {
1985 next = TAILQ_NEXT(p, listq);
1988 * Avoid releasing and reacquiring the same page lock.
1990 new_mtx = vm_page_lockptr(p);
1991 if (mtx != new_mtx) {
1997 vm_page_deactivate_noreuse(p);
2004 * Populate the specified range of the object with valid pages. Returns
2005 * TRUE if the range is successfully populated and FALSE otherwise.
2007 * Note: This function should be optimized to pass a larger array of
2008 * pages to vm_pager_get_pages() before it is applied to a non-
2009 * OBJT_DEVICE object.
2011 * The object must be locked.
2014 vm_object_populate(vm_object_t object, vm_pindex_t start, vm_pindex_t end)
2020 VM_OBJECT_ASSERT_WLOCKED(object);
2021 for (pindex = start; pindex < end; pindex++) {
2022 m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL);
2023 if (m->valid != VM_PAGE_BITS_ALL) {
2024 rv = vm_pager_get_pages(object, &m, 1, NULL, NULL);
2025 if (rv != VM_PAGER_OK) {
2033 * Keep "m" busy because a subsequent iteration may unlock
2037 if (pindex > start) {
2038 m = vm_page_lookup(object, start);
2039 while (m != NULL && m->pindex < pindex) {
2041 m = TAILQ_NEXT(m, listq);
2044 return (pindex == end);
2048 * Routine: vm_object_coalesce
2049 * Function: Coalesces two objects backing up adjoining
2050 * regions of memory into a single object.
2052 * returns TRUE if objects were combined.
2054 * NOTE: Only works at the moment if the second object is NULL -
2055 * if it's not, which object do we lock first?
2058 * prev_object First object to coalesce
2059 * prev_offset Offset into prev_object
2060 * prev_size Size of reference to prev_object
2061 * next_size Size of reference to the second object
2062 * reserved Indicator that extension region has
2063 * swap accounted for
2066 * The object must *not* be locked.
2069 vm_object_coalesce(vm_object_t prev_object, vm_ooffset_t prev_offset,
2070 vm_size_t prev_size, vm_size_t next_size, boolean_t reserved)
2072 vm_pindex_t next_pindex;
2074 if (prev_object == NULL)
2076 VM_OBJECT_WLOCK(prev_object);
2077 if ((prev_object->type != OBJT_DEFAULT &&
2078 prev_object->type != OBJT_SWAP) ||
2079 (prev_object->flags & OBJ_TMPFS_NODE) != 0) {
2080 VM_OBJECT_WUNLOCK(prev_object);
2085 * Try to collapse the object first
2087 vm_object_collapse(prev_object);
2090 * Can't coalesce if: . more than one reference . paged out . shadows
2091 * another object . has a copy elsewhere (any of which mean that the
2092 * pages not mapped to prev_entry may be in use anyway)
2094 if (prev_object->backing_object != NULL) {
2095 VM_OBJECT_WUNLOCK(prev_object);
2099 prev_size >>= PAGE_SHIFT;
2100 next_size >>= PAGE_SHIFT;
2101 next_pindex = OFF_TO_IDX(prev_offset) + prev_size;
2103 if ((prev_object->ref_count > 1) &&
2104 (prev_object->size != next_pindex)) {
2105 VM_OBJECT_WUNLOCK(prev_object);
2110 * Account for the charge.
2112 if (prev_object->cred != NULL) {
2115 * If prev_object was charged, then this mapping,
2116 * although not charged now, may become writable
2117 * later. Non-NULL cred in the object would prevent
2118 * swap reservation during enabling of the write
2119 * access, so reserve swap now. Failed reservation
2120 * cause allocation of the separate object for the map
2121 * entry, and swap reservation for this entry is
2122 * managed in appropriate time.
2124 if (!reserved && !swap_reserve_by_cred(ptoa(next_size),
2125 prev_object->cred)) {
2128 prev_object->charge += ptoa(next_size);
2132 * Remove any pages that may still be in the object from a previous
2135 if (next_pindex < prev_object->size) {
2136 vm_object_page_remove(prev_object, next_pindex, next_pindex +
2138 if (prev_object->type == OBJT_SWAP)
2139 swap_pager_freespace(prev_object,
2140 next_pindex, next_size);
2142 if (prev_object->cred != NULL) {
2143 KASSERT(prev_object->charge >=
2144 ptoa(prev_object->size - next_pindex),
2145 ("object %p overcharged 1 %jx %jx", prev_object,
2146 (uintmax_t)next_pindex, (uintmax_t)next_size));
2147 prev_object->charge -= ptoa(prev_object->size -
2154 * Extend the object if necessary.
2156 if (next_pindex + next_size > prev_object->size)
2157 prev_object->size = next_pindex + next_size;
2159 VM_OBJECT_WUNLOCK(prev_object);
2164 vm_object_set_writeable_dirty(vm_object_t object)
2167 VM_OBJECT_ASSERT_WLOCKED(object);
2168 if (object->type != OBJT_VNODE) {
2169 if ((object->flags & OBJ_TMPFS_NODE) != 0) {
2170 KASSERT(object->type == OBJT_SWAP, ("non-swap tmpfs"));
2171 vm_object_set_flag(object, OBJ_TMPFS_DIRTY);
2175 object->generation++;
2176 if ((object->flags & OBJ_MIGHTBEDIRTY) != 0)
2178 vm_object_set_flag(object, OBJ_MIGHTBEDIRTY);
2184 * For each page offset within the specified range of the given object,
2185 * find the highest-level page in the shadow chain and unwire it. A page
2186 * must exist at every page offset, and the highest-level page must be
2190 vm_object_unwire(vm_object_t object, vm_ooffset_t offset, vm_size_t length,
2193 vm_object_t tobject;
2195 vm_pindex_t end_pindex, pindex, tpindex;
2196 int depth, locked_depth;
2198 KASSERT((offset & PAGE_MASK) == 0,
2199 ("vm_object_unwire: offset is not page aligned"));
2200 KASSERT((length & PAGE_MASK) == 0,
2201 ("vm_object_unwire: length is not a multiple of PAGE_SIZE"));
2202 /* The wired count of a fictitious page never changes. */
2203 if ((object->flags & OBJ_FICTITIOUS) != 0)
2205 pindex = OFF_TO_IDX(offset);
2206 end_pindex = pindex + atop(length);
2208 VM_OBJECT_RLOCK(object);
2209 m = vm_page_find_least(object, pindex);
2210 while (pindex < end_pindex) {
2211 if (m == NULL || pindex < m->pindex) {
2213 * The first object in the shadow chain doesn't
2214 * contain a page at the current index. Therefore,
2215 * the page must exist in a backing object.
2222 OFF_TO_IDX(tobject->backing_object_offset);
2223 tobject = tobject->backing_object;
2224 KASSERT(tobject != NULL,
2225 ("vm_object_unwire: missing page"));
2226 if ((tobject->flags & OBJ_FICTITIOUS) != 0)
2229 if (depth == locked_depth) {
2231 VM_OBJECT_RLOCK(tobject);
2233 } while ((tm = vm_page_lookup(tobject, tpindex)) ==
2237 m = TAILQ_NEXT(m, listq);
2240 vm_page_unwire(tm, queue);
2245 /* Release the accumulated object locks. */
2246 for (depth = 0; depth < locked_depth; depth++) {
2247 tobject = object->backing_object;
2248 VM_OBJECT_RUNLOCK(object);
2254 vm_object_vnode(vm_object_t object)
2257 VM_OBJECT_ASSERT_LOCKED(object);
2258 if (object->type == OBJT_VNODE)
2259 return (object->handle);
2260 if (object->type == OBJT_SWAP && (object->flags & OBJ_TMPFS) != 0)
2261 return (object->un_pager.swp.swp_tmpfs);
2266 sysctl_vm_object_list(SYSCTL_HANDLER_ARGS)
2268 struct kinfo_vmobject kvo;
2269 char *fullpath, *freepath;
2276 if (req->oldptr == NULL) {
2278 * If an old buffer has not been provided, generate an
2279 * estimate of the space needed for a subsequent call.
2281 mtx_lock(&vm_object_list_mtx);
2283 TAILQ_FOREACH(obj, &vm_object_list, object_list) {
2284 if (obj->type == OBJT_DEAD)
2288 mtx_unlock(&vm_object_list_mtx);
2289 return (SYSCTL_OUT(req, NULL, sizeof(struct kinfo_vmobject) *
2296 * VM objects are type stable and are never removed from the
2297 * list once added. This allows us to safely read obj->object_list
2298 * after reacquiring the VM object lock.
2300 mtx_lock(&vm_object_list_mtx);
2301 TAILQ_FOREACH(obj, &vm_object_list, object_list) {
2302 if (obj->type == OBJT_DEAD)
2304 VM_OBJECT_RLOCK(obj);
2305 if (obj->type == OBJT_DEAD) {
2306 VM_OBJECT_RUNLOCK(obj);
2309 mtx_unlock(&vm_object_list_mtx);
2310 kvo.kvo_size = ptoa(obj->size);
2311 kvo.kvo_resident = obj->resident_page_count;
2312 kvo.kvo_ref_count = obj->ref_count;
2313 kvo.kvo_shadow_count = obj->shadow_count;
2314 kvo.kvo_memattr = obj->memattr;
2316 kvo.kvo_inactive = 0;
2317 TAILQ_FOREACH(m, &obj->memq, listq) {
2319 * A page may belong to the object but be
2320 * dequeued and set to PQ_NONE while the
2321 * object lock is not held. This makes the
2322 * reads of m->queue below racy, and we do not
2323 * count pages set to PQ_NONE. However, this
2324 * sysctl is only meant to give an
2325 * approximation of the system anyway.
2327 if (m->queue == PQ_ACTIVE)
2329 else if (m->queue == PQ_INACTIVE)
2333 kvo.kvo_vn_fileid = 0;
2334 kvo.kvo_vn_fsid = 0;
2338 switch (obj->type) {
2340 kvo.kvo_type = KVME_TYPE_DEFAULT;
2343 kvo.kvo_type = KVME_TYPE_VNODE;
2348 kvo.kvo_type = KVME_TYPE_SWAP;
2351 kvo.kvo_type = KVME_TYPE_DEVICE;
2354 kvo.kvo_type = KVME_TYPE_PHYS;
2357 kvo.kvo_type = KVME_TYPE_DEAD;
2360 kvo.kvo_type = KVME_TYPE_SG;
2362 case OBJT_MGTDEVICE:
2363 kvo.kvo_type = KVME_TYPE_MGTDEVICE;
2366 kvo.kvo_type = KVME_TYPE_UNKNOWN;
2369 VM_OBJECT_RUNLOCK(obj);
2371 vn_fullpath(curthread, vp, &fullpath, &freepath);
2372 vn_lock(vp, LK_SHARED | LK_RETRY);
2373 if (VOP_GETATTR(vp, &va, curthread->td_ucred) == 0) {
2374 kvo.kvo_vn_fileid = va.va_fileid;
2375 kvo.kvo_vn_fsid = va.va_fsid;
2380 strlcpy(kvo.kvo_path, fullpath, sizeof(kvo.kvo_path));
2381 if (freepath != NULL)
2382 free(freepath, M_TEMP);
2384 /* Pack record size down */
2385 kvo.kvo_structsize = offsetof(struct kinfo_vmobject, kvo_path) +
2386 strlen(kvo.kvo_path) + 1;
2387 kvo.kvo_structsize = roundup(kvo.kvo_structsize,
2389 error = SYSCTL_OUT(req, &kvo, kvo.kvo_structsize);
2390 mtx_lock(&vm_object_list_mtx);
2394 mtx_unlock(&vm_object_list_mtx);
2397 SYSCTL_PROC(_vm, OID_AUTO, objects, CTLTYPE_STRUCT | CTLFLAG_RW | CTLFLAG_SKIP |
2398 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_object_list, "S,kinfo_vmobject",
2399 "List of VM objects");
2401 #include "opt_ddb.h"
2403 #include <sys/kernel.h>
2405 #include <sys/cons.h>
2407 #include <ddb/ddb.h>
2410 _vm_object_in_map(vm_map_t map, vm_object_t object, vm_map_entry_t entry)
2413 vm_map_entry_t tmpe;
2421 tmpe = map->header.next;
2422 entcount = map->nentries;
2423 while (entcount-- && (tmpe != &map->header)) {
2424 if (_vm_object_in_map(map, object, tmpe)) {
2429 } else if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
2430 tmpm = entry->object.sub_map;
2431 tmpe = tmpm->header.next;
2432 entcount = tmpm->nentries;
2433 while (entcount-- && tmpe != &tmpm->header) {
2434 if (_vm_object_in_map(tmpm, object, tmpe)) {
2439 } else if ((obj = entry->object.vm_object) != NULL) {
2440 for (; obj; obj = obj->backing_object)
2441 if (obj == object) {
2449 vm_object_in_map(vm_object_t object)
2453 /* sx_slock(&allproc_lock); */
2454 FOREACH_PROC_IN_SYSTEM(p) {
2455 if (!p->p_vmspace /* || (p->p_flag & (P_SYSTEM|P_WEXIT)) */)
2457 if (_vm_object_in_map(&p->p_vmspace->vm_map, object, 0)) {
2458 /* sx_sunlock(&allproc_lock); */
2462 /* sx_sunlock(&allproc_lock); */
2463 if (_vm_object_in_map(kernel_map, object, 0))
2468 DB_SHOW_COMMAND(vmochk, vm_object_check)
2473 * make sure that internal objs are in a map somewhere
2474 * and none have zero ref counts.
2476 TAILQ_FOREACH(object, &vm_object_list, object_list) {
2477 if (object->handle == NULL &&
2478 (object->type == OBJT_DEFAULT || object->type == OBJT_SWAP)) {
2479 if (object->ref_count == 0) {
2480 db_printf("vmochk: internal obj has zero ref count: %ld\n",
2481 (long)object->size);
2483 if (!vm_object_in_map(object)) {
2485 "vmochk: internal obj is not in a map: "
2486 "ref: %d, size: %lu: 0x%lx, backing_object: %p\n",
2487 object->ref_count, (u_long)object->size,
2488 (u_long)object->size,
2489 (void *)object->backing_object);
2496 * vm_object_print: [ debug ]
2498 DB_SHOW_COMMAND(object, vm_object_print_static)
2500 /* XXX convert args. */
2501 vm_object_t object = (vm_object_t)addr;
2502 boolean_t full = have_addr;
2506 /* XXX count is an (unused) arg. Avoid shadowing it. */
2507 #define count was_count
2515 "Object %p: type=%d, size=0x%jx, res=%d, ref=%d, flags=0x%x ruid %d charge %jx\n",
2516 object, (int)object->type, (uintmax_t)object->size,
2517 object->resident_page_count, object->ref_count, object->flags,
2518 object->cred ? object->cred->cr_ruid : -1, (uintmax_t)object->charge);
2519 db_iprintf(" sref=%d, backing_object(%d)=(%p)+0x%jx\n",
2520 object->shadow_count,
2521 object->backing_object ? object->backing_object->ref_count : 0,
2522 object->backing_object, (uintmax_t)object->backing_object_offset);
2529 TAILQ_FOREACH(p, &object->memq, listq) {
2531 db_iprintf("memory:=");
2532 else if (count == 6) {
2540 db_printf("(off=0x%jx,page=0x%jx)",
2541 (uintmax_t)p->pindex, (uintmax_t)VM_PAGE_TO_PHYS(p));
2551 /* XXX need this non-static entry for calling from vm_map_print. */
2554 /* db_expr_t */ long addr,
2555 boolean_t have_addr,
2556 /* db_expr_t */ long count,
2559 vm_object_print_static(addr, have_addr, count, modif);
2562 DB_SHOW_COMMAND(vmopag, vm_object_print_pages)
2567 vm_page_t m, prev_m;
2571 TAILQ_FOREACH(object, &vm_object_list, object_list) {
2572 db_printf("new object: %p\n", (void *)object);
2583 TAILQ_FOREACH(m, &object->memq, listq) {
2584 if (m->pindex > 128)
2586 if ((prev_m = TAILQ_PREV(m, pglist, listq)) != NULL &&
2587 prev_m->pindex + 1 != m->pindex) {
2589 db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
2590 (long)fidx, rcount, (long)pa);
2602 (VM_PAGE_TO_PHYS(m) == pa + rcount * PAGE_SIZE)) {
2607 db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
2608 (long)fidx, rcount, (long)pa);
2618 pa = VM_PAGE_TO_PHYS(m);
2622 db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
2623 (long)fidx, rcount, (long)pa);