2fe6e4d71e
Enabled via REL2_1. Added support for doing object collapses "on the fly". Enabled via REL2_1a. Improved object collapses so that they can happen in more cases. Improved sensing of modified pages to fix an apparant race condition and improve clustered pageout opportunities. Fixed an "oops" with not restarting page scan after a potential block in vm_pageout_clean() (not doing this can result in strange behavior in some cases). Submitted by: John Dyson & David Greenman
178 lines
7.1 KiB
C
178 lines
7.1 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_object.h,v 1.2 1994/08/02 07:55:31 davidg Exp $
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*/
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/*
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* Virtual memory object module definitions.
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*/
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#ifndef _VM_OBJECT_
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#define _VM_OBJECT_
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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/*
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* Types defined:
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*
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* vm_object_t Virtual memory object.
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*/
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struct vm_object {
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struct pglist memq; /* Resident memory */
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TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
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u_short flags; /* see below */
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u_short paging_in_progress; /* Paging (in or out) so
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don't collapse or destroy */
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simple_lock_data_t Lock; /* Synchronization */
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int ref_count; /* How many refs?? */
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vm_size_t size; /* Object size */
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int resident_page_count;
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/* number of resident pages */
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struct vm_object *copy; /* Object that holds copies of
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my changed pages */
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vm_pager_t pager; /* Where to get data */
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vm_offset_t paging_offset; /* Offset into paging space */
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struct vm_object *shadow; /* My shadow */
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vm_offset_t shadow_offset; /* Offset in shadow */
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TAILQ_ENTRY(vm_object) cached_list; /* for persistence */
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TAILQ_ENTRY(vm_object) reverse_shadow_list; /* chain of objects that are shadowed */
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TAILQ_HEAD(rslist, vm_object) reverse_shadow_head; /* objects that this is a shadow for */
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};
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/*
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* Flags
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*/
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#define OBJ_CANPERSIST 0x0001 /* allow to persist */
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#define OBJ_INTERNAL 0x0002 /* internally created object */
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#define OBJ_ACTIVE 0x0004 /* used to mark active objects */
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TAILQ_HEAD(vm_object_hash_head, vm_object_hash_entry);
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struct vm_object_hash_entry {
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TAILQ_ENTRY(vm_object_hash_entry) hash_links; /* hash chain links */
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vm_object_t object; /* object represened */
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};
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typedef struct vm_object_hash_entry *vm_object_hash_entry_t;
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#ifdef KERNEL
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TAILQ_HEAD(object_q, vm_object);
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struct object_q vm_object_cached_list; /* list of objects persisting */
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int vm_object_cached; /* size of cached list */
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simple_lock_data_t vm_cache_lock; /* lock for object cache */
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struct object_q vm_object_list; /* list of allocated objects */
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long vm_object_count; /* count of all objects */
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simple_lock_data_t vm_object_list_lock;
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/* lock for object list and count */
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vm_object_t kernel_object; /* the single kernel object */
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vm_object_t kmem_object;
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#define vm_object_cache_lock() simple_lock(&vm_cache_lock)
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#define vm_object_cache_unlock() simple_unlock(&vm_cache_lock)
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#endif /* KERNEL */
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#define vm_object_lock_init(object) simple_lock_init(&(object)->Lock)
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#define vm_object_lock(object) simple_lock(&(object)->Lock)
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#define vm_object_unlock(object) simple_unlock(&(object)->Lock)
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#define vm_object_lock_try(object) simple_lock_try(&(object)->Lock)
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#define vm_object_sleep(event, object, interruptible) \
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thread_sleep((event), &(object)->Lock, (interruptible))
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#ifdef KERNEL
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vm_object_t vm_object_allocate __P((vm_size_t));
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void vm_object_cache_clear __P((void));
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void vm_object_cache_trim __P((void));
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boolean_t vm_object_coalesce __P((vm_object_t, vm_object_t,
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vm_offset_t, vm_offset_t, vm_offset_t, vm_size_t));
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void vm_object_collapse __P((vm_object_t));
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void vm_object_copy __P((vm_object_t, vm_offset_t, vm_size_t,
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vm_object_t *, vm_offset_t *, boolean_t *));
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void vm_object_deactivate_pages __P((vm_object_t));
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void vm_object_deallocate __P((vm_object_t));
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void vm_object_enter __P((vm_object_t, vm_pager_t));
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void vm_object_init __P((vm_size_t));
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vm_object_t vm_object_lookup __P((vm_pager_t));
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boolean_t vm_object_page_clean __P((vm_object_t,
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vm_offset_t, vm_offset_t, boolean_t, boolean_t));
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void vm_object_page_remove __P((vm_object_t,
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vm_offset_t, vm_offset_t));
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void vm_object_pmap_copy __P((vm_object_t,
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vm_offset_t, vm_offset_t));
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void vm_object_pmap_remove __P((vm_object_t,
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vm_offset_t, vm_offset_t));
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void vm_object_print __P((vm_object_t, boolean_t));
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void vm_object_reference __P((vm_object_t));
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void vm_object_remove __P((vm_pager_t));
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void vm_object_setpager __P((vm_object_t,
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vm_pager_t, vm_offset_t, boolean_t));
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void vm_object_shadow __P((vm_object_t *,
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vm_offset_t *, vm_size_t));
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void vm_object_terminate __P((vm_object_t));
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#endif
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#endif /* _VM_OBJECT_ */
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