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.h 8.3 (Berkeley) 1/12/94
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.
64 * Virtual memory object module definitions.
70 #include <sys/queue.h>
71 #include <sys/_lock.h>
72 #include <sys/_mutex.h>
74 #include <vm/_vm_radix.h>
79 * vm_object_t Virtual memory object.
81 * The root of cached pages pool is protected by both the per-object mutex
82 * and the free pages queue mutex.
83 * On insert in the cache radix trie, the per-object mutex is expected
84 * to be already held and the free pages queue mutex will be
85 * acquired during the operation too.
86 * On remove and lookup from the cache radix trie, only the free
87 * pages queue mutex is expected to be locked.
88 * These rules allow for reliably checking for the presence of cached
89 * pages with only the per-object lock held, thereby reducing contention
90 * for the free pages queue mutex.
93 * (c) const until freed
94 * (o) per-object mutex
95 * (f) free pages queue mutex
101 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
102 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
103 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
104 TAILQ_HEAD(, vm_page) memq; /* list of resident pages */
105 struct vm_radix rtree; /* root of the resident page radix trie*/
106 vm_pindex_t size; /* Object size */
107 int generation; /* generation ID */
108 int ref_count; /* How many refs?? */
109 int shadow_count; /* how many objects that this is a shadow for */
110 vm_memattr_t memattr; /* default memory attribute for pages */
111 objtype_t type; /* type of pager */
112 u_short flags; /* see below */
113 u_short pg_color; /* (c) color of first page in obj */
114 u_int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
115 int resident_page_count; /* number of resident pages */
116 struct vm_object *backing_object; /* object that I'm a shadow of */
117 vm_ooffset_t backing_object_offset;/* Offset in backing object */
118 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
119 LIST_HEAD(, vm_reserv) rvq; /* list of reservations */
120 struct vm_radix cache; /* (o + f) root of the cache page radix trie */
126 * vnp_size - current size of file
130 vm_ooffset_t writemappings;
136 * devp_pglist - list of allocated pages
139 TAILQ_HEAD(, vm_page) devp_pglist;
140 struct cdev_pager_ops *ops;
147 * sgp_pglist - list of allocated pages
150 TAILQ_HEAD(, vm_page) sgp_pglist;
156 * swp_bcount - number of swap 'swblock' metablocks, each
157 * contains up to 16 swapblk assignments.
158 * see vm/swap_pager.h
171 #define OBJ_FICTITIOUS 0x0001 /* (c) contains fictitious pages */
172 #define OBJ_UNMANAGED 0x0002 /* (c) contains unmanaged pages */
173 #define OBJ_ACTIVE 0x0004 /* active objects */
174 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
175 #define OBJ_NOSPLIT 0x0010 /* dont split this object */
176 #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
177 #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty, only for vnode */
178 #define OBJ_COLORED 0x1000 /* pg_color is defined */
179 #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
180 #define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */
182 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
183 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
187 #define OBJPC_SYNC 0x1 /* sync I/O */
188 #define OBJPC_INVAL 0x2 /* invalidate */
189 #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
192 * The following options are supported by vm_object_page_remove().
194 #define OBJPR_CLEANONLY 0x1 /* Don't remove dirty pages. */
195 #define OBJPR_NOTMAPPED 0x2 /* Don't unmap pages. */
197 TAILQ_HEAD(object_q, vm_object);
199 extern struct object_q vm_object_list; /* list of allocated objects */
200 extern struct mtx vm_object_list_mtx; /* lock for object list and count */
202 extern struct vm_object kernel_object_store;
203 extern struct vm_object kmem_object_store;
205 #define kernel_object (&kernel_object_store)
206 #define kmem_object (&kmem_object_store)
208 #define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx)
209 #define VM_OBJECT_LOCK_ASSERT(object, type) \
210 mtx_assert(&(object)->mtx, (type))
211 #define VM_OBJECT_LOCK_INIT(object, type) \
212 mtx_init(&(object)->mtx, "vm object", \
213 (type), MTX_DEF | MTX_DUPOK)
214 #define VM_OBJECT_LOCKED(object) mtx_owned(&(object)->mtx)
215 #define VM_OBJECT_MTX(object) (&(object)->mtx)
216 #define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx)
217 #define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx)
220 * The object must be locked or thread private.
223 vm_object_set_flag(vm_object_t object, u_short bits)
226 object->flags |= bits;
229 void vm_object_clear_flag(vm_object_t object, u_short bits);
230 void vm_object_pip_add(vm_object_t object, short i);
231 void vm_object_pip_subtract(vm_object_t object, short i);
232 void vm_object_pip_wakeup(vm_object_t object);
233 void vm_object_pip_wakeupn(vm_object_t object, short i);
234 void vm_object_pip_wait(vm_object_t object, char *waitid);
236 static __inline boolean_t
237 vm_object_cache_is_empty(vm_object_t object)
240 return (__predict_true(object->cache.rt_root == 0));
243 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
244 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
245 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t,
247 void vm_object_collapse (vm_object_t);
248 void vm_object_deallocate (vm_object_t);
249 void vm_object_destroy (vm_object_t);
250 void vm_object_terminate (vm_object_t);
251 void vm_object_set_writeable_dirty (vm_object_t);
252 void vm_object_init (void);
253 void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int);
254 void vm_object_page_cache(vm_object_t object, vm_pindex_t start,
256 boolean_t vm_object_page_clean(vm_object_t object, vm_ooffset_t start,
257 vm_ooffset_t end, int flags);
258 void vm_object_page_remove(vm_object_t object, vm_pindex_t start,
259 vm_pindex_t end, int options);
260 boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t);
261 void vm_object_print(long addr, boolean_t have_addr, long count, char *modif);
262 void vm_object_reference (vm_object_t);
263 void vm_object_reference_locked(vm_object_t);
264 int vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr);
265 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
266 void vm_object_split(vm_map_entry_t);
267 boolean_t vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
271 #endif /* _VM_OBJECT_ */