freebsd-dev/sys/vm/vm_object.h
David Greenman 6d40c3d394 Added ability to detect sequential faults and DTRT. (swap_pager.c)
Added hook for pmap_prefault() and use symbolic constant for new third
argument to vm_page_alloc() (vm_fault.c, various)
Changed the way that upages and page tables are held. (vm_glue.c)
Fixed architectural flaw in allocating pages at interrupt time that was
introduced with the merged cache changes. (vm_page.c, various)
Adjusted some algorithms to acheive better paging performance and to
accomodate the fix for the architectural flaw mentioned above. (vm_pageout.c)
Fixed pbuf handling problem, changed policy on handling read-behind page.
(vnode_pager.c)

Submitted by:	John Dyson
1995-01-24 10:14:09 +00:00

213 lines
7.9 KiB
C

/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* The Mach Operating System project at Carnegie-Mellon University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94
*
*
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
* All rights reserved.
*
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_object.h,v 1.4 1995/01/09 16:05:50 davidg Exp $
*/
/*
* Virtual memory object module definitions.
*/
#ifndef _VM_OBJECT_
#define _VM_OBJECT_
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
/*
* Types defined:
*
* vm_object_t Virtual memory object.
*/
struct vm_object {
struct pglist memq; /* Resident memory */
TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
u_short flags; /* see below */
u_short paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
int ref_count; /* How many refs?? */
struct {
int recursion; /* object locking */
struct proc *proc; /* process owned */
} lock;
vm_size_t size; /* Object size */
int resident_page_count;
/* number of resident pages */
struct vm_object *copy; /* Object that holds copies of my changed pages */
vm_pager_t pager; /* Where to get data */
vm_offset_t paging_offset; /* Offset into paging space */
struct vm_object *shadow; /* My shadow */
vm_offset_t shadow_offset; /* Offset in shadow */
vm_offset_t last_read; /* last read in object -- detect seq behavior */
TAILQ_ENTRY(vm_object) cached_list; /* for persistence */
TAILQ_ENTRY(vm_object) reverse_shadow_list; /* chain of objects that are shadowed */
TAILQ_HEAD(rslist, vm_object) reverse_shadow_head; /* objects that this is a shadow for */
};
/*
* Flags
*/
#define OBJ_CANPERSIST 0x0001 /* allow to persist */
#define OBJ_INTERNAL 0x0002 /* internally created object */
#define OBJ_ACTIVE 0x0004 /* used to mark active objects */
#define OBJ_DEAD 0x0008 /* used to mark dead objects during rundown */
#define OBJ_ILOCKED 0x0010 /* lock from modification */
#define OBJ_ILOCKWT 0x0020 /* wait for lock from modification */
TAILQ_HEAD(vm_object_hash_head, vm_object_hash_entry);
struct vm_object_hash_entry {
TAILQ_ENTRY(vm_object_hash_entry) hash_links; /* hash chain links */
vm_object_t object; /* object represened */
};
typedef struct vm_object_hash_entry *vm_object_hash_entry_t;
#ifdef KERNEL
TAILQ_HEAD(object_q, vm_object);
struct object_q vm_object_cached_list; /* list of objects persisting */
int vm_object_cached; /* size of cached list */
simple_lock_data_t vm_cache_lock; /* lock for object cache */
struct object_q vm_object_list; /* list of allocated objects */
long vm_object_count; /* count of all objects */
simple_lock_data_t vm_object_list_lock;
/* lock for object list and count */
vm_object_t kernel_object; /* the single kernel object */
vm_object_t kmem_object;
#define vm_object_cache_lock() simple_lock(&vm_cache_lock)
#define vm_object_cache_unlock() simple_unlock(&vm_cache_lock)
#endif /* KERNEL */
#define vm_object_sleep(event, object, interruptible) \
thread_sleep((event), &(object)->Lock, (interruptible))
#if 0
#define vm_object_lock_init(object) simple_lock_init(&(object)->Lock)
#define vm_object_lock(object) simple_lock(&(object)->Lock)
#define vm_object_unlock(object) simple_unlock(&(object)->Lock)
#define vm_object_lock_try(object) simple_lock_try(&(object)->Lock)
#endif
#define vm_object_lock_init(object) (object->flags &= ~OBJ_ILOCKED, object->lock.recursion = 0, object->lock.proc = 0)
static __inline void
vm_object_lock(vm_object_t obj)
{
if (obj->flags & OBJ_ILOCKED) {
++obj->lock.recursion;
return;
}
obj->flags |= OBJ_ILOCKED;
obj->lock.recursion = 1;
}
static __inline void
vm_object_unlock(vm_object_t obj)
{
--obj->lock.recursion;
if (obj->lock.recursion != 0)
return;
obj->flags &= ~OBJ_ILOCKED;
}
static __inline int
vm_object_lock_try(vm_object_t obj)
{
if (obj->flags & OBJ_ILOCKED) {
++obj->lock.recursion;
return 1;
}
obj->flags |= OBJ_ILOCKED;
obj->lock.recursion = 1;
return 1;
}
#ifdef KERNEL
vm_object_t vm_object_allocate __P((vm_size_t));
void vm_object_cache_clear __P((void));
void vm_object_cache_trim __P((void));
boolean_t vm_object_coalesce __P((vm_object_t, vm_object_t, vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t));
void vm_object_collapse __P((vm_object_t));
void vm_object_copy __P((vm_object_t, vm_offset_t, vm_size_t, vm_object_t *, vm_offset_t *, boolean_t *));
void vm_object_deactivate_pages __P((vm_object_t));
void vm_object_deallocate __P((vm_object_t));
void vm_object_enter __P((vm_object_t, vm_pager_t));
void vm_object_init __P((vm_size_t));
vm_object_t vm_object_lookup __P((vm_pager_t));
boolean_t vm_object_page_clean __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t));
void vm_object_page_remove __P((vm_object_t, vm_offset_t, vm_offset_t));
void vm_object_pmap_copy __P((vm_object_t, vm_offset_t, vm_offset_t));
void vm_object_pmap_remove __P((vm_object_t, vm_offset_t, vm_offset_t));
void vm_object_print __P((vm_object_t, boolean_t));
void vm_object_reference __P((vm_object_t));
void vm_object_remove __P((vm_pager_t));
void vm_object_setpager __P((vm_object_t, vm_pager_t, vm_offset_t, boolean_t));
void vm_object_shadow __P((vm_object_t *, vm_offset_t *, vm_size_t));
void vm_object_terminate __P((vm_object_t));
#endif
#endif /* _VM_OBJECT_ */