709ad55889
general way but must be evaluated case by case. Embedd the decision in the caller themselves rather than in a general purpose KPI. Sponsored by: EMC / Isilon storage division Reported by: alc Reviewed by: alc
269 lines
9.4 KiB
C
269 lines
9.4 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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* 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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* $FreeBSD$
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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 <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <vm/_vm_radix.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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* The root of cached pages pool is protected by both the per-object mutex
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* and the free pages queue mutex.
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* On insert in the cache radix trie, the per-object mutex is expected
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* to be already held and the free pages queue mutex will be
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* acquired during the operation too.
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* On remove and lookup from the cache radix trie, only the free
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* pages queue mutex is expected to be locked.
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* These rules allow for reliably checking for the presence of cached
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* pages with only the per-object lock held, thereby reducing contention
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* for the free pages queue mutex.
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*
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* List of locks
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* (c) const until freed
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* (o) per-object mutex
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* (f) free pages queue mutex
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*
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*/
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struct vm_object {
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struct mtx mtx;
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TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
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LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
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LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
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TAILQ_HEAD(, vm_page) memq; /* list of resident pages */
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struct vm_radix rtree; /* root of the resident page radix trie*/
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vm_pindex_t size; /* Object size */
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int generation; /* generation ID */
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int ref_count; /* How many refs?? */
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int shadow_count; /* how many objects that this is a shadow for */
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vm_memattr_t memattr; /* default memory attribute for pages */
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objtype_t type; /* type of pager */
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u_short flags; /* see below */
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u_short pg_color; /* (c) color of first page in obj */
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u_int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
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int resident_page_count; /* number of resident pages */
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struct vm_object *backing_object; /* object that I'm a shadow of */
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vm_ooffset_t backing_object_offset;/* Offset in backing object */
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TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
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LIST_HEAD(, vm_reserv) rvq; /* list of reservations */
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struct vm_radix cache; /* (o + f) root of the cache page radix trie */
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void *handle;
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union {
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/*
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* VNode pager
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*
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* vnp_size - current size of file
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*/
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struct {
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off_t vnp_size;
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vm_ooffset_t writemappings;
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} vnp;
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/*
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* Device pager
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*
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* devp_pglist - list of allocated pages
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*/
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struct {
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TAILQ_HEAD(, vm_page) devp_pglist;
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struct cdev_pager_ops *ops;
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struct cdev *dev;
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} devp;
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/*
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* SG pager
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*
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* sgp_pglist - list of allocated pages
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*/
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struct {
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TAILQ_HEAD(, vm_page) sgp_pglist;
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} sgp;
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/*
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* Swap pager
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*
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* swp_bcount - number of swap 'swblock' metablocks, each
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* contains up to 16 swapblk assignments.
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* see vm/swap_pager.h
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*/
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struct {
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int swp_bcount;
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} swp;
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} un_pager;
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struct ucred *cred;
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vm_ooffset_t charge;
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};
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/*
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* Flags
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*/
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#define OBJ_FICTITIOUS 0x0001 /* (c) contains fictitious pages */
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#define OBJ_UNMANAGED 0x0002 /* (c) contains unmanaged pages */
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#define OBJ_ACTIVE 0x0004 /* active objects */
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#define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
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#define OBJ_NOSPLIT 0x0010 /* dont split this object */
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#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
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#define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty, only for vnode */
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#define OBJ_COLORED 0x1000 /* pg_color is defined */
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#define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
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#define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */
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#define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
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#define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
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#ifdef _KERNEL
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#define OBJPC_SYNC 0x1 /* sync I/O */
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#define OBJPC_INVAL 0x2 /* invalidate */
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#define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
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/*
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* The following options are supported by vm_object_page_remove().
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*/
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#define OBJPR_CLEANONLY 0x1 /* Don't remove dirty pages. */
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#define OBJPR_NOTMAPPED 0x2 /* Don't unmap pages. */
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TAILQ_HEAD(object_q, vm_object);
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extern struct object_q vm_object_list; /* list of allocated objects */
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extern struct mtx vm_object_list_mtx; /* lock for object list and count */
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extern struct vm_object kernel_object_store;
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extern struct vm_object kmem_object_store;
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#define kernel_object (&kernel_object_store)
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#define kmem_object (&kmem_object_store)
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#define VM_OBJECT_LOCK(object) mtx_lock(&(object)->mtx)
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#define VM_OBJECT_LOCK_ASSERT(object, type) \
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mtx_assert(&(object)->mtx, (type))
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#define VM_OBJECT_SLEEP(object, wchan, pri, wmesg, timo) \
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msleep((wchan), &(object)->mtx, (pri), \
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(wmesg), (timo))
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#define VM_OBJECT_TRYLOCK(object) mtx_trylock(&(object)->mtx)
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#define VM_OBJECT_UNLOCK(object) mtx_unlock(&(object)->mtx)
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/*
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* The object must be locked or thread private.
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*/
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static __inline void
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vm_object_set_flag(vm_object_t object, u_short bits)
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{
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object->flags |= bits;
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}
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void vm_object_clear_flag(vm_object_t object, u_short bits);
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void vm_object_pip_add(vm_object_t object, short i);
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void vm_object_pip_subtract(vm_object_t object, short i);
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void vm_object_pip_wakeup(vm_object_t object);
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void vm_object_pip_wakeupn(vm_object_t object, short i);
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void vm_object_pip_wait(vm_object_t object, char *waitid);
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static __inline boolean_t
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vm_object_cache_is_empty(vm_object_t object)
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{
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return (object->cache.rt_root == 0);
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}
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vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
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boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t,
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boolean_t);
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void vm_object_collapse (vm_object_t);
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void vm_object_deallocate (vm_object_t);
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void vm_object_destroy (vm_object_t);
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void vm_object_terminate (vm_object_t);
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void vm_object_set_writeable_dirty (vm_object_t);
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void vm_object_init (void);
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void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int);
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void vm_object_page_cache(vm_object_t object, vm_pindex_t start,
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vm_pindex_t end);
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boolean_t vm_object_page_clean(vm_object_t object, vm_ooffset_t start,
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vm_ooffset_t end, int flags);
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void vm_object_page_remove(vm_object_t object, vm_pindex_t start,
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vm_pindex_t end, int options);
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boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t);
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void vm_object_print(long addr, boolean_t have_addr, long count, char *modif);
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void vm_object_reference (vm_object_t);
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void vm_object_reference_locked(vm_object_t);
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int vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr);
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void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
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void vm_object_split(vm_map_entry_t);
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boolean_t vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
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boolean_t);
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#endif /* _KERNEL */
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#endif /* _VM_OBJECT_ */
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