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f6b04d2bfb
Fixed remaining known bugs in the buffer IO and VM system. vfs_bio.c: Fixed some race conditions and locking bugs. Improved performance by removing some (now) unnecessary code and fixing some broken logic. Fixed process accounting of # of FS outputs. Properly handle NFS interrupts (B_EINTR). (various) Replaced calls to clrbuf() with calls to an optimized routine called vfs_bio_clrbuf(). (various FS sync) Sync out modified vnode_pager backed pages. ffs_vnops.c: Do two passes: Sync out file data first, then indirect blocks. vm_fault.c: Fixed deadly embrace caused by acquiring locks in the wrong order. vnode_pager.c: Changed to use buffer I/O system for writing out modified pages. This should fix the problem with the modification date previous not getting updated. Also dramatically simplifies the code. Note that this is going to change in the future and be implemented via VOP_PUTPAGES(). vm_object.c: Fixed a pile of bugs related to cleaning (vnode) objects. The performance of vm_object_page_clean() is terrible when dealing with huge objects, but this will change when we implement a binary tree to keep the object pages sorted. vm_pageout.c: Fixed broken clustering of pageouts. Fixed race conditions and other lockup style bugs in the scanning of pages. Improved performance.
190 lines
7.5 KiB
C
190 lines
7.5 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 1.16 1995/03/22 12:24:11 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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#ifdef KERNEL
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#include <sys/proc.h> /* XXX for wakeup() */
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#endif
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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_HEAD(rslist, vm_object) reverse_shadow_head; /* objects that this is a shadow for */
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TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
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TAILQ_ENTRY(vm_object) reverse_shadow_list; /* chain of objects that are shadowed */
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TAILQ_ENTRY(vm_object) cached_list; /* for persistence */
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vm_size_t size; /* Object size */
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int ref_count; /* How many refs?? */
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u_short flags; /* see below */
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u_short 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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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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struct vm_object *copy; /* Object that holds copies of my changed pages */
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vm_offset_t last_read; /* last read in object -- detect seq behavior */
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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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#define OBJ_DEAD 0x0008 /* used to mark dead objects during rundown */
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#define OBJ_ILOCKED 0x0010 /* lock from modification */
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#define OBJ_ILOCKWT 0x0020 /* wait for lock from modification */
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#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
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#define OBJ_WRITEABLE 0x0080 /* object has been made writeable */
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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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extern int vm_object_cache_max;
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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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#if 1
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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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#endif
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#ifdef KERNEL
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static __inline void
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vm_object_pip_wakeup(vm_object_t object)
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{
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object->paging_in_progress--;
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if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
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object->flags &= ~OBJ_PIPWNT;
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wakeup(object);
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}
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}
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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, 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, 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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void _vm_object_page_clean __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t));
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void vm_object_page_clean __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t));
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void vm_object_page_remove __P((vm_object_t, vm_offset_t, vm_offset_t, boolean_t));
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void vm_object_pmap_copy __P((vm_object_t, vm_offset_t, vm_offset_t));
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void vm_object_pmap_remove __P((vm_object_t, 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_shadow __P((vm_object_t *, vm_offset_t *, vm_size_t));
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void vm_object_terminate __P((vm_object_t));
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#endif /* KERNEL */
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#endif /* _VM_OBJECT_ */
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