The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_object.h

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    1 /*-
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * The Mach Operating System project at Carnegie-Mellon University.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   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.
   19  *
   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
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)vm_object.h   8.3 (Berkeley) 1/12/94
   33  *
   34  *
   35  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   36  * All rights reserved.
   37  *
   38  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   39  *
   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.
   45  *
   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.
   49  *
   50  * Carnegie Mellon requests users of this software to return to
   51  *
   52  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   53  *  School of Computer Science
   54  *  Carnegie Mellon University
   55  *  Pittsburgh PA 15213-3890
   56  *
   57  * any improvements or extensions that they make and grant Carnegie the
   58  * rights to redistribute these changes.
   59  *
   60  * $FreeBSD: releng/10.0/sys/vm/vm_object.h 254141 2013-08-09 11:28:55Z attilio $
   61  */
   62 
   63 /*
   64  *      Virtual memory object module definitions.
   65  */
   66 
   67 #ifndef _VM_OBJECT_
   68 #define _VM_OBJECT_
   69 
   70 #include <sys/queue.h>
   71 #include <sys/_lock.h>
   72 #include <sys/_mutex.h>
   73 #include <sys/_rwlock.h>
   74 
   75 #include <vm/_vm_radix.h>
   76 
   77 /*
   78  *      Types defined:
   79  *
   80  *      vm_object_t             Virtual memory object.
   81  *
   82  *      The root of cached pages pool is protected by both the per-object lock
   83  *      and the free pages queue mutex.
   84  *      On insert in the cache radix trie, the per-object lock is expected
   85  *      to be already held and the free pages queue mutex will be
   86  *      acquired during the operation too.
   87  *      On remove and lookup from the cache radix trie, only the free
   88  *      pages queue mutex is expected to be locked.
   89  *      These rules allow for reliably checking for the presence of cached
   90  *      pages with only the per-object lock held, thereby reducing contention
   91  *      for the free pages queue mutex.
   92  *
   93  * List of locks
   94  *      (c)     const until freed
   95  *      (o)     per-object lock 
   96  *      (f)     free pages queue mutex
   97  *
   98  */
   99 
  100 struct vm_object {
  101         struct rwlock lock;
  102         TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
  103         LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
  104         LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
  105         TAILQ_HEAD(respgs, vm_page) memq; /* list of resident pages */
  106         struct vm_radix rtree;          /* root of the resident page radix trie*/
  107         vm_pindex_t size;               /* Object size */
  108         int generation;                 /* generation ID */
  109         int ref_count;                  /* How many refs?? */
  110         int shadow_count;               /* how many objects that this is a shadow for */
  111         vm_memattr_t memattr;           /* default memory attribute for pages */
  112         objtype_t type;                 /* type of pager */
  113         u_short flags;                  /* see below */
  114         u_short pg_color;               /* (c) color of first page in obj */
  115         u_int paging_in_progress;       /* Paging (in or out) so don't collapse or destroy */
  116         int resident_page_count;        /* number of resident pages */
  117         struct vm_object *backing_object; /* object that I'm a shadow of */
  118         vm_ooffset_t backing_object_offset;/* Offset in backing object */
  119         TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
  120         LIST_HEAD(, vm_reserv) rvq;     /* list of reservations */
  121         struct vm_radix cache;          /* (o + f) root of the cache page radix trie */
  122         void *handle;
  123         union {
  124                 /*
  125                  * VNode pager
  126                  *
  127                  *      vnp_size - current size of file
  128                  */
  129                 struct {
  130                         off_t vnp_size;
  131                         vm_ooffset_t writemappings;
  132                 } vnp;
  133 
  134                 /*
  135                  * Device pager
  136                  *
  137                  *      devp_pglist - list of allocated pages
  138                  */
  139                 struct {
  140                         TAILQ_HEAD(, vm_page) devp_pglist;
  141                         struct cdev_pager_ops *ops;
  142                         struct cdev *dev;
  143                 } devp;
  144 
  145                 /*
  146                  * SG pager
  147                  *
  148                  *      sgp_pglist - list of allocated pages
  149                  */
  150                 struct {
  151                         TAILQ_HEAD(, vm_page) sgp_pglist;
  152                 } sgp;
  153 
  154                 /*
  155                  * Swap pager
  156                  *
  157                  *      swp_tmpfs - back-pointer to the tmpfs vnode,
  158                  *                   if any, which uses the vm object
  159                  *                   as backing store.  The handle
  160                  *                   cannot be reused for linking,
  161                  *                   because the vnode can be
  162                  *                   reclaimed and recreated, making
  163                  *                   the handle changed and hash-chain
  164                  *                   invalid.
  165                  *
  166                  *      swp_bcount - number of swap 'swblock' metablocks, each
  167                  *                   contains up to 16 swapblk assignments.
  168                  *                   see vm/swap_pager.h
  169                  */
  170                 struct {
  171                         void *swp_tmpfs;
  172                         int swp_bcount;
  173                 } swp;
  174         } un_pager;
  175         struct ucred *cred;
  176         vm_ooffset_t charge;
  177 };
  178 
  179 /*
  180  * Flags
  181  */
  182 #define OBJ_FICTITIOUS  0x0001          /* (c) contains fictitious pages */
  183 #define OBJ_UNMANAGED   0x0002          /* (c) contains unmanaged pages */
  184 #define OBJ_ACTIVE      0x0004          /* active objects */
  185 #define OBJ_DEAD        0x0008          /* dead objects (during rundown) */
  186 #define OBJ_NOSPLIT     0x0010          /* dont split this object */
  187 #define OBJ_PIPWNT      0x0040          /* paging in progress wanted */
  188 #define OBJ_MIGHTBEDIRTY 0x0100         /* object might be dirty, only for vnode */
  189 #define OBJ_COLORED     0x1000          /* pg_color is defined */
  190 #define OBJ_ONEMAPPING  0x2000          /* One USE (a single, non-forked) mapping flag */
  191 #define OBJ_DISCONNECTWNT 0x4000        /* disconnect from vnode wanted */
  192 #define OBJ_TMPFS       0x8000
  193 
  194 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
  195 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
  196 
  197 #ifdef  _KERNEL
  198 
  199 #define OBJPC_SYNC      0x1                     /* sync I/O */
  200 #define OBJPC_INVAL     0x2                     /* invalidate */
  201 #define OBJPC_NOSYNC    0x4                     /* skip if PG_NOSYNC */
  202 
  203 /*
  204  * The following options are supported by vm_object_page_remove().
  205  */
  206 #define OBJPR_CLEANONLY 0x1             /* Don't remove dirty pages. */
  207 #define OBJPR_NOTMAPPED 0x2             /* Don't unmap pages. */
  208 #define OBJPR_NOTWIRED  0x4             /* Don't remove wired pages. */
  209 
  210 TAILQ_HEAD(object_q, vm_object);
  211 
  212 extern struct object_q vm_object_list;  /* list of allocated objects */
  213 extern struct mtx vm_object_list_mtx;   /* lock for object list and count */
  214 
  215 extern struct vm_object kernel_object_store;
  216 extern struct vm_object kmem_object_store;
  217 
  218 #define kernel_object   (&kernel_object_store)
  219 #define kmem_object     (&kmem_object_store)
  220 
  221 #define VM_OBJECT_ASSERT_LOCKED(object)                                 \
  222         rw_assert(&(object)->lock, RA_LOCKED)
  223 #define VM_OBJECT_ASSERT_RLOCKED(object)                                \
  224         rw_assert(&(object)->lock, RA_RLOCKED)
  225 #define VM_OBJECT_ASSERT_WLOCKED(object)                                \
  226         rw_assert(&(object)->lock, RA_WLOCKED)
  227 #define VM_OBJECT_LOCK_DOWNGRADE(object)                                \
  228         rw_downgrade(&(object)->lock)
  229 #define VM_OBJECT_RLOCK(object)                                         \
  230         rw_rlock(&(object)->lock)
  231 #define VM_OBJECT_RUNLOCK(object)                                       \
  232         rw_runlock(&(object)->lock)
  233 #define VM_OBJECT_SLEEP(object, wchan, pri, wmesg, timo)                \
  234         rw_sleep((wchan), &(object)->lock, (pri), (wmesg), (timo))
  235 #define VM_OBJECT_TRYRLOCK(object)                                      \
  236         rw_try_rlock(&(object)->lock)
  237 #define VM_OBJECT_TRYWLOCK(object)                                      \
  238         rw_try_wlock(&(object)->lock)
  239 #define VM_OBJECT_WLOCK(object)                                         \
  240         rw_wlock(&(object)->lock)
  241 #define VM_OBJECT_WUNLOCK(object)                                       \
  242         rw_wunlock(&(object)->lock)
  243 
  244 /*
  245  *      The object must be locked or thread private.
  246  */
  247 static __inline void
  248 vm_object_set_flag(vm_object_t object, u_short bits)
  249 {
  250 
  251         object->flags |= bits;
  252 }
  253 
  254 void vm_object_clear_flag(vm_object_t object, u_short bits);
  255 void vm_object_pip_add(vm_object_t object, short i);
  256 void vm_object_pip_subtract(vm_object_t object, short i);
  257 void vm_object_pip_wakeup(vm_object_t object);
  258 void vm_object_pip_wakeupn(vm_object_t object, short i);
  259 void vm_object_pip_wait(vm_object_t object, char *waitid);
  260 
  261 static __inline boolean_t
  262 vm_object_cache_is_empty(vm_object_t object)
  263 {
  264 
  265         return (vm_radix_is_empty(&object->cache));
  266 }
  267 
  268 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
  269 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t,
  270    boolean_t);
  271 void vm_object_collapse (vm_object_t);
  272 void vm_object_deallocate (vm_object_t);
  273 void vm_object_destroy (vm_object_t);
  274 void vm_object_terminate (vm_object_t);
  275 void vm_object_set_writeable_dirty (vm_object_t);
  276 void vm_object_init (void);
  277 void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int);
  278 void vm_object_page_cache(vm_object_t object, vm_pindex_t start,
  279     vm_pindex_t end);
  280 boolean_t vm_object_page_clean(vm_object_t object, vm_ooffset_t start,
  281     vm_ooffset_t end, int flags);
  282 void vm_object_page_remove(vm_object_t object, vm_pindex_t start,
  283     vm_pindex_t end, int options);
  284 boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t);
  285 void vm_object_print(long addr, boolean_t have_addr, long count, char *modif);
  286 void vm_object_reference (vm_object_t);
  287 void vm_object_reference_locked(vm_object_t);
  288 int  vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr);
  289 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
  290 void vm_object_split(vm_map_entry_t);
  291 boolean_t vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
  292     boolean_t);
  293 #endif                          /* _KERNEL */
  294 
  295 #endif                          /* _VM_OBJECT_ */

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