553629ebc9
allproc zombproc pidhashtbl proc.p_list proc.p_hash nextpid Reviewed by: jhb Obtained from: BSD/OS and netbsd
1833 lines
43 KiB
C
1833 lines
43 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.c 8.5 (Berkeley) 3/22/94
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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.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h> /* for curproc, pageproc */
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#include <sys/vnode.h>
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#include <sys/vmmeter.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_pager.h>
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#include <vm/swap_pager.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_zone.h>
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static void vm_object_qcollapse __P((vm_object_t object));
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/*
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* Virtual memory objects maintain the actual data
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* associated with allocated virtual memory. A given
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* page of memory exists within exactly one object.
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*
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* An object is only deallocated when all "references"
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* are given up. Only one "reference" to a given
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* region of an object should be writeable.
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*
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* Associated with each object is a list of all resident
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* memory pages belonging to that object; this list is
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* maintained by the "vm_page" module, and locked by the object's
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* lock.
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*
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* Each object also records a "pager" routine which is
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* used to retrieve (and store) pages to the proper backing
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* storage. In addition, objects may be backed by other
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* objects from which they were virtual-copied.
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*
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* The only items within the object structure which are
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* modified after time of creation are:
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* reference count locked by object's lock
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* pager routine locked by object's lock
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*
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*/
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struct object_q vm_object_list;
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#ifndef NULL_SIMPLELOCKS
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static struct simplelock vm_object_list_lock;
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#endif
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static long vm_object_count; /* count of all objects */
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vm_object_t kernel_object;
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vm_object_t kmem_object;
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static struct vm_object kernel_object_store;
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static struct vm_object kmem_object_store;
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extern int vm_pageout_page_count;
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static long object_collapses;
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static long object_bypasses;
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static int next_index;
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static vm_zone_t obj_zone;
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static struct vm_zone obj_zone_store;
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static int object_hash_rand;
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#define VM_OBJECTS_INIT 256
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static struct vm_object vm_objects_init[VM_OBJECTS_INIT];
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void
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_vm_object_allocate(type, size, object)
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objtype_t type;
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vm_size_t size;
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vm_object_t object;
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{
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int incr;
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TAILQ_INIT(&object->memq);
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TAILQ_INIT(&object->shadow_head);
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object->type = type;
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object->size = size;
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object->ref_count = 1;
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object->flags = 0;
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if ((object->type == OBJT_DEFAULT) || (object->type == OBJT_SWAP))
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vm_object_set_flag(object, OBJ_ONEMAPPING);
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object->paging_in_progress = 0;
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object->resident_page_count = 0;
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object->shadow_count = 0;
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object->pg_color = next_index;
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if ( size > (PQ_L2_SIZE / 3 + PQ_PRIME1))
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incr = PQ_L2_SIZE / 3 + PQ_PRIME1;
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else
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incr = size;
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next_index = (next_index + incr) & PQ_L2_MASK;
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object->handle = NULL;
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object->backing_object = NULL;
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object->backing_object_offset = (vm_ooffset_t) 0;
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/*
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* Try to generate a number that will spread objects out in the
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* hash table. We 'wipe' new objects across the hash in 128 page
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* increments plus 1 more to offset it a little more by the time
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* it wraps around.
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*/
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object->hash_rand = object_hash_rand - 129;
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object->generation++;
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TAILQ_INSERT_TAIL(&vm_object_list, object, object_list);
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vm_object_count++;
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object_hash_rand = object->hash_rand;
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}
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/*
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* vm_object_init:
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*
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* Initialize the VM objects module.
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*/
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void
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vm_object_init()
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{
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TAILQ_INIT(&vm_object_list);
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simple_lock_init(&vm_object_list_lock);
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vm_object_count = 0;
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kernel_object = &kernel_object_store;
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_vm_object_allocate(OBJT_DEFAULT, OFF_TO_IDX(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS),
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kernel_object);
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kmem_object = &kmem_object_store;
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_vm_object_allocate(OBJT_DEFAULT, OFF_TO_IDX(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS),
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kmem_object);
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obj_zone = &obj_zone_store;
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zbootinit(obj_zone, "VM OBJECT", sizeof (struct vm_object),
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vm_objects_init, VM_OBJECTS_INIT);
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}
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void
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vm_object_init2() {
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zinitna(obj_zone, NULL, NULL, 0, 0, 0, 1);
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}
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/*
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* vm_object_allocate:
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*
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* Returns a new object with the given size.
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*/
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vm_object_t
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vm_object_allocate(type, size)
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objtype_t type;
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vm_size_t size;
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{
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vm_object_t result;
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result = (vm_object_t) zalloc(obj_zone);
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_vm_object_allocate(type, size, result);
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return (result);
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}
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/*
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* vm_object_reference:
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*
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* Gets another reference to the given object.
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*/
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void
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vm_object_reference(object)
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vm_object_t object;
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{
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if (object == NULL)
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return;
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KASSERT(!(object->flags & OBJ_DEAD),
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("vm_object_reference: attempting to reference dead obj"));
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object->ref_count++;
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if (object->type == OBJT_VNODE) {
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while (vget((struct vnode *) object->handle, LK_RETRY|LK_NOOBJ, curproc)) {
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printf("vm_object_reference: delay in getting object\n");
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}
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}
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}
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void
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vm_object_vndeallocate(object)
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vm_object_t object;
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{
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struct vnode *vp = (struct vnode *) object->handle;
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KASSERT(object->type == OBJT_VNODE,
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("vm_object_vndeallocate: not a vnode object"));
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KASSERT(vp != NULL, ("vm_object_vndeallocate: missing vp"));
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#ifdef INVARIANTS
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if (object->ref_count == 0) {
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vprint("vm_object_vndeallocate", vp);
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panic("vm_object_vndeallocate: bad object reference count");
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}
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#endif
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object->ref_count--;
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if (object->ref_count == 0) {
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vp->v_flag &= ~VTEXT;
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vm_object_clear_flag(object, OBJ_OPT);
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}
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vrele(vp);
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}
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/*
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* vm_object_deallocate:
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*
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* Release a reference to the specified object,
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* gained either through a vm_object_allocate
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* or a vm_object_reference call. When all references
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* are gone, storage associated with this object
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* may be relinquished.
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*
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* No object may be locked.
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*/
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void
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vm_object_deallocate(object)
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vm_object_t object;
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{
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vm_object_t temp;
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while (object != NULL) {
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if (object->type == OBJT_VNODE) {
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vm_object_vndeallocate(object);
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return;
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}
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if (object->ref_count == 0) {
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panic("vm_object_deallocate: object deallocated too many times: %d", object->type);
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} else if (object->ref_count > 2) {
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object->ref_count--;
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return;
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}
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/*
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* Here on ref_count of one or two, which are special cases for
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* objects.
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*/
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if ((object->ref_count == 2) && (object->shadow_count == 0)) {
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vm_object_set_flag(object, OBJ_ONEMAPPING);
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object->ref_count--;
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return;
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} else if ((object->ref_count == 2) && (object->shadow_count == 1)) {
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object->ref_count--;
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if ((object->handle == NULL) &&
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(object->type == OBJT_DEFAULT ||
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object->type == OBJT_SWAP)) {
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vm_object_t robject;
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robject = TAILQ_FIRST(&object->shadow_head);
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KASSERT(robject != NULL,
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("vm_object_deallocate: ref_count: %d, shadow_count: %d",
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object->ref_count,
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object->shadow_count));
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if ((robject->handle == NULL) &&
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(robject->type == OBJT_DEFAULT ||
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robject->type == OBJT_SWAP)) {
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robject->ref_count++;
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while (
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robject->paging_in_progress ||
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object->paging_in_progress
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) {
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vm_object_pip_sleep(robject, "objde1");
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vm_object_pip_sleep(object, "objde2");
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}
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if (robject->ref_count == 1) {
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robject->ref_count--;
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object = robject;
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goto doterm;
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}
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object = robject;
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vm_object_collapse(object);
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continue;
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}
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}
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return;
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} else {
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object->ref_count--;
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if (object->ref_count != 0)
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return;
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}
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doterm:
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temp = object->backing_object;
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if (temp) {
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TAILQ_REMOVE(&temp->shadow_head, object, shadow_list);
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temp->shadow_count--;
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if (temp->ref_count == 0)
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vm_object_clear_flag(temp, OBJ_OPT);
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temp->generation++;
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object->backing_object = NULL;
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}
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vm_object_terminate(object);
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/* unlocks and deallocates object */
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object = temp;
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}
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}
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/*
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* vm_object_terminate actually destroys the specified object, freeing
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* up all previously used resources.
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*
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* The object must be locked.
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* This routine may block.
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*/
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void
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vm_object_terminate(object)
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vm_object_t object;
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{
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vm_page_t p;
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int s;
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/*
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* Make sure no one uses us.
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*/
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vm_object_set_flag(object, OBJ_DEAD);
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/*
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* wait for the pageout daemon to be done with the object
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*/
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vm_object_pip_wait(object, "objtrm");
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KASSERT(!object->paging_in_progress,
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("vm_object_terminate: pageout in progress"));
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/*
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* Clean and free the pages, as appropriate. All references to the
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* object are gone, so we don't need to lock it.
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*/
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if (object->type == OBJT_VNODE) {
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struct vnode *vp;
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/*
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* Freeze optimized copies.
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*/
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vm_freeze_copyopts(object, 0, object->size);
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/*
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* Clean pages and flush buffers.
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*/
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vm_object_page_clean(object, 0, 0, OBJPC_SYNC);
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vp = (struct vnode *) object->handle;
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vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0);
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}
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if (object->ref_count != 0)
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panic("vm_object_terminate: object with references, ref_count=%d", object->ref_count);
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|
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/*
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* Now free any remaining pages. For internal objects, this also
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* removes them from paging queues. Don't free wired pages, just
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* remove them from the object.
|
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*/
|
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s = splvm();
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while ((p = TAILQ_FIRST(&object->memq)) != NULL) {
|
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if (p->busy || (p->flags & PG_BUSY))
|
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panic("vm_object_terminate: freeing busy page %p\n", p);
|
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if (p->wire_count == 0) {
|
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vm_page_busy(p);
|
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vm_page_free(p);
|
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cnt.v_pfree++;
|
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} else {
|
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vm_page_busy(p);
|
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vm_page_remove(p);
|
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}
|
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}
|
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splx(s);
|
|
|
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/*
|
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* Let the pager know object is dead.
|
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*/
|
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vm_pager_deallocate(object);
|
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|
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/*
|
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* Remove the object from the global object list.
|
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*/
|
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simple_lock(&vm_object_list_lock);
|
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TAILQ_REMOVE(&vm_object_list, object, object_list);
|
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simple_unlock(&vm_object_list_lock);
|
|
|
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wakeup(object);
|
|
|
|
/*
|
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* Free the space for the object.
|
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*/
|
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zfree(obj_zone, object);
|
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}
|
|
|
|
/*
|
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* vm_object_page_clean
|
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*
|
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* Clean all dirty pages in the specified range of object. Leaves page
|
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* on whatever queue it is currently on. If NOSYNC is set then do not
|
|
* write out pages with PG_NOSYNC set (originally comes from MAP_NOSYNC),
|
|
* leaving the object dirty.
|
|
*
|
|
* Odd semantics: if start == end, we clean everything.
|
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*
|
|
* The object must be locked.
|
|
*/
|
|
|
|
void
|
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vm_object_page_clean(object, start, end, flags)
|
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vm_object_t object;
|
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vm_pindex_t start;
|
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vm_pindex_t end;
|
|
int flags;
|
|
{
|
|
vm_page_t p, np, tp;
|
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vm_offset_t tstart, tend;
|
|
vm_pindex_t pi;
|
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int s;
|
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struct vnode *vp;
|
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int runlen;
|
|
int maxf;
|
|
int chkb;
|
|
int maxb;
|
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int i;
|
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int clearobjflags;
|
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int pagerflags;
|
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vm_page_t maf[vm_pageout_page_count];
|
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vm_page_t mab[vm_pageout_page_count];
|
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vm_page_t ma[vm_pageout_page_count];
|
|
int curgeneration;
|
|
|
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if (object->type != OBJT_VNODE ||
|
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(object->flags & OBJ_MIGHTBEDIRTY) == 0)
|
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return;
|
|
|
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pagerflags = (flags & (OBJPC_SYNC | OBJPC_INVAL)) ? VM_PAGER_PUT_SYNC : 0;
|
|
pagerflags |= (flags & OBJPC_INVAL) ? VM_PAGER_PUT_INVAL : 0;
|
|
|
|
vp = object->handle;
|
|
|
|
vm_object_set_flag(object, OBJ_CLEANING);
|
|
|
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tstart = start;
|
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if (end == 0) {
|
|
tend = object->size;
|
|
} else {
|
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tend = end;
|
|
}
|
|
|
|
/*
|
|
* Generally set CLEANCHK interlock and make the page read-only so
|
|
* we can then clear the object flags.
|
|
*
|
|
* However, if this is a nosync mmap then the object is likely to
|
|
* stay dirty so do not mess with the page and do not clear the
|
|
* object flags.
|
|
*/
|
|
|
|
clearobjflags = 1;
|
|
|
|
for(p = TAILQ_FIRST(&object->memq); p; p = TAILQ_NEXT(p, listq)) {
|
|
vm_page_flag_set(p, PG_CLEANCHK);
|
|
if ((flags & OBJPC_NOSYNC) && (p->flags & PG_NOSYNC))
|
|
clearobjflags = 0;
|
|
else
|
|
vm_page_protect(p, VM_PROT_READ);
|
|
}
|
|
|
|
if (clearobjflags && (tstart == 0) && (tend == object->size)) {
|
|
vm_object_clear_flag(object, OBJ_WRITEABLE|OBJ_MIGHTBEDIRTY);
|
|
}
|
|
|
|
rescan:
|
|
curgeneration = object->generation;
|
|
|
|
for(p = TAILQ_FIRST(&object->memq); p; p = np) {
|
|
np = TAILQ_NEXT(p, listq);
|
|
|
|
pi = p->pindex;
|
|
if (((p->flags & PG_CLEANCHK) == 0) ||
|
|
(pi < tstart) || (pi >= tend) ||
|
|
(p->valid == 0) ||
|
|
((p->queue - p->pc) == PQ_CACHE)) {
|
|
vm_page_flag_clear(p, PG_CLEANCHK);
|
|
continue;
|
|
}
|
|
|
|
vm_page_test_dirty(p);
|
|
if ((p->dirty & p->valid) == 0) {
|
|
vm_page_flag_clear(p, PG_CLEANCHK);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If we have been asked to skip nosync pages and this is a
|
|
* nosync page, skip it. Note that the object flags were
|
|
* not cleared in this case so we do not have to set them.
|
|
*/
|
|
if ((flags & OBJPC_NOSYNC) && (p->flags & PG_NOSYNC)) {
|
|
vm_page_flag_clear(p, PG_CLEANCHK);
|
|
continue;
|
|
}
|
|
|
|
s = splvm();
|
|
while (vm_page_sleep_busy(p, TRUE, "vpcwai")) {
|
|
if (object->generation != curgeneration) {
|
|
splx(s);
|
|
goto rescan;
|
|
}
|
|
}
|
|
|
|
maxf = 0;
|
|
for(i=1;i<vm_pageout_page_count;i++) {
|
|
if ((tp = vm_page_lookup(object, pi + i)) != NULL) {
|
|
if ((tp->flags & PG_BUSY) ||
|
|
(tp->flags & PG_CLEANCHK) == 0 ||
|
|
(tp->busy != 0))
|
|
break;
|
|
if((tp->queue - tp->pc) == PQ_CACHE) {
|
|
vm_page_flag_clear(tp, PG_CLEANCHK);
|
|
break;
|
|
}
|
|
vm_page_test_dirty(tp);
|
|
if ((tp->dirty & tp->valid) == 0) {
|
|
vm_page_flag_clear(tp, PG_CLEANCHK);
|
|
break;
|
|
}
|
|
maf[ i - 1 ] = tp;
|
|
maxf++;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
maxb = 0;
|
|
chkb = vm_pageout_page_count - maxf;
|
|
if (chkb) {
|
|
for(i = 1; i < chkb;i++) {
|
|
if ((tp = vm_page_lookup(object, pi - i)) != NULL) {
|
|
if ((tp->flags & PG_BUSY) ||
|
|
(tp->flags & PG_CLEANCHK) == 0 ||
|
|
(tp->busy != 0))
|
|
break;
|
|
if((tp->queue - tp->pc) == PQ_CACHE) {
|
|
vm_page_flag_clear(tp, PG_CLEANCHK);
|
|
break;
|
|
}
|
|
vm_page_test_dirty(tp);
|
|
if ((tp->dirty & tp->valid) == 0) {
|
|
vm_page_flag_clear(tp, PG_CLEANCHK);
|
|
break;
|
|
}
|
|
mab[ i - 1 ] = tp;
|
|
maxb++;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
for(i=0;i<maxb;i++) {
|
|
int index = (maxb - i) - 1;
|
|
ma[index] = mab[i];
|
|
vm_page_flag_clear(ma[index], PG_CLEANCHK);
|
|
}
|
|
vm_page_flag_clear(p, PG_CLEANCHK);
|
|
ma[maxb] = p;
|
|
for(i=0;i<maxf;i++) {
|
|
int index = (maxb + i) + 1;
|
|
ma[index] = maf[i];
|
|
vm_page_flag_clear(ma[index], PG_CLEANCHK);
|
|
}
|
|
runlen = maxb + maxf + 1;
|
|
|
|
splx(s);
|
|
vm_pageout_flush(ma, runlen, pagerflags);
|
|
for (i = 0; i<runlen; i++) {
|
|
if (ma[i]->valid & ma[i]->dirty) {
|
|
vm_page_protect(ma[i], VM_PROT_READ);
|
|
vm_page_flag_set(ma[i], PG_CLEANCHK);
|
|
}
|
|
}
|
|
if (object->generation != curgeneration)
|
|
goto rescan;
|
|
}
|
|
|
|
#if 0
|
|
VOP_FSYNC(vp, NULL, (pagerflags & VM_PAGER_PUT_SYNC)?MNT_WAIT:0, curproc);
|
|
#endif
|
|
|
|
vm_object_clear_flag(object, OBJ_CLEANING);
|
|
return;
|
|
}
|
|
|
|
#ifdef not_used
|
|
/* XXX I cannot tell if this should be an exported symbol */
|
|
/*
|
|
* vm_object_deactivate_pages
|
|
*
|
|
* Deactivate all pages in the specified object. (Keep its pages
|
|
* in memory even though it is no longer referenced.)
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
static void
|
|
vm_object_deactivate_pages(object)
|
|
vm_object_t object;
|
|
{
|
|
vm_page_t p, next;
|
|
|
|
for (p = TAILQ_FIRST(&object->memq); p != NULL; p = next) {
|
|
next = TAILQ_NEXT(p, listq);
|
|
vm_page_deactivate(p);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Same as vm_object_pmap_copy, except range checking really
|
|
* works, and is meant for small sections of an object.
|
|
*
|
|
* This code protects resident pages by making them read-only
|
|
* and is typically called on a fork or split when a page
|
|
* is converted to copy-on-write.
|
|
*
|
|
* NOTE: If the page is already at VM_PROT_NONE, calling
|
|
* vm_page_protect will have no effect.
|
|
*/
|
|
|
|
void
|
|
vm_object_pmap_copy_1(object, start, end)
|
|
vm_object_t object;
|
|
vm_pindex_t start;
|
|
vm_pindex_t end;
|
|
{
|
|
vm_pindex_t idx;
|
|
vm_page_t p;
|
|
|
|
if (object == NULL || (object->flags & OBJ_WRITEABLE) == 0)
|
|
return;
|
|
|
|
for (idx = start; idx < end; idx++) {
|
|
p = vm_page_lookup(object, idx);
|
|
if (p == NULL)
|
|
continue;
|
|
vm_page_protect(p, VM_PROT_READ);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_object_pmap_remove:
|
|
*
|
|
* Removes all physical pages in the specified
|
|
* object range from all physical maps.
|
|
*
|
|
* The object must *not* be locked.
|
|
*/
|
|
void
|
|
vm_object_pmap_remove(object, start, end)
|
|
vm_object_t object;
|
|
vm_pindex_t start;
|
|
vm_pindex_t end;
|
|
{
|
|
vm_page_t p;
|
|
|
|
if (object == NULL)
|
|
return;
|
|
for (p = TAILQ_FIRST(&object->memq);
|
|
p != NULL;
|
|
p = TAILQ_NEXT(p, listq)) {
|
|
if (p->pindex >= start && p->pindex < end)
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
}
|
|
if ((start == 0) && (object->size == end))
|
|
vm_object_clear_flag(object, OBJ_WRITEABLE);
|
|
}
|
|
|
|
/*
|
|
* vm_object_madvise:
|
|
*
|
|
* Implements the madvise function at the object/page level.
|
|
*
|
|
* MADV_WILLNEED (any object)
|
|
*
|
|
* Activate the specified pages if they are resident.
|
|
*
|
|
* MADV_DONTNEED (any object)
|
|
*
|
|
* Deactivate the specified pages if they are resident.
|
|
*
|
|
* MADV_FREE (OBJT_DEFAULT/OBJT_SWAP objects,
|
|
* OBJ_ONEMAPPING only)
|
|
*
|
|
* Deactivate and clean the specified pages if they are
|
|
* resident. This permits the process to reuse the pages
|
|
* without faulting or the kernel to reclaim the pages
|
|
* without I/O.
|
|
*/
|
|
void
|
|
vm_object_madvise(object, pindex, count, advise)
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
int count;
|
|
int advise;
|
|
{
|
|
vm_pindex_t end, tpindex;
|
|
vm_object_t tobject;
|
|
vm_page_t m;
|
|
|
|
if (object == NULL)
|
|
return;
|
|
|
|
end = pindex + count;
|
|
|
|
/*
|
|
* Locate and adjust resident pages
|
|
*/
|
|
|
|
for (; pindex < end; pindex += 1) {
|
|
relookup:
|
|
tobject = object;
|
|
tpindex = pindex;
|
|
shadowlookup:
|
|
/*
|
|
* MADV_FREE only operates on OBJT_DEFAULT or OBJT_SWAP pages
|
|
* and those pages must be OBJ_ONEMAPPING.
|
|
*/
|
|
if (advise == MADV_FREE) {
|
|
if ((tobject->type != OBJT_DEFAULT &&
|
|
tobject->type != OBJT_SWAP) ||
|
|
(tobject->flags & OBJ_ONEMAPPING) == 0) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
m = vm_page_lookup(tobject, tpindex);
|
|
|
|
if (m == NULL) {
|
|
/*
|
|
* There may be swap even if there is no backing page
|
|
*/
|
|
if (advise == MADV_FREE && tobject->type == OBJT_SWAP)
|
|
swap_pager_freespace(tobject, tpindex, 1);
|
|
|
|
/*
|
|
* next object
|
|
*/
|
|
tobject = tobject->backing_object;
|
|
if (tobject == NULL)
|
|
continue;
|
|
tpindex += OFF_TO_IDX(tobject->backing_object_offset);
|
|
goto shadowlookup;
|
|
}
|
|
|
|
/*
|
|
* If the page is busy or not in a normal active state,
|
|
* we skip it. If the page is not managed there are no
|
|
* page queues to mess with. Things can break if we mess
|
|
* with pages in any of the below states.
|
|
*/
|
|
if (
|
|
m->hold_count ||
|
|
m->wire_count ||
|
|
(m->flags & PG_UNMANAGED) ||
|
|
m->valid != VM_PAGE_BITS_ALL
|
|
) {
|
|
continue;
|
|
}
|
|
|
|
if (vm_page_sleep_busy(m, TRUE, "madvpo"))
|
|
goto relookup;
|
|
|
|
if (advise == MADV_WILLNEED) {
|
|
vm_page_activate(m);
|
|
} else if (advise == MADV_DONTNEED) {
|
|
vm_page_dontneed(m);
|
|
} else if (advise == MADV_FREE) {
|
|
/*
|
|
* Mark the page clean. This will allow the page
|
|
* to be freed up by the system. However, such pages
|
|
* are often reused quickly by malloc()/free()
|
|
* so we do not do anything that would cause
|
|
* a page fault if we can help it.
|
|
*
|
|
* Specifically, we do not try to actually free
|
|
* the page now nor do we try to put it in the
|
|
* cache (which would cause a page fault on reuse).
|
|
*
|
|
* But we do make the page is freeable as we
|
|
* can without actually taking the step of unmapping
|
|
* it.
|
|
*/
|
|
pmap_clear_modify(m);
|
|
m->dirty = 0;
|
|
m->act_count = 0;
|
|
vm_page_dontneed(m);
|
|
if (tobject->type == OBJT_SWAP)
|
|
swap_pager_freespace(tobject, tpindex, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_object_shadow:
|
|
*
|
|
* Create a new object which is backed by the
|
|
* specified existing object range. The source
|
|
* object reference is deallocated.
|
|
*
|
|
* The new object and offset into that object
|
|
* are returned in the source parameters.
|
|
*/
|
|
|
|
void
|
|
vm_object_shadow(object, offset, length)
|
|
vm_object_t *object; /* IN/OUT */
|
|
vm_ooffset_t *offset; /* IN/OUT */
|
|
vm_size_t length;
|
|
{
|
|
vm_object_t source;
|
|
vm_object_t result;
|
|
|
|
source = *object;
|
|
|
|
/*
|
|
* Don't create the new object if the old object isn't shared.
|
|
*/
|
|
|
|
if (source != NULL &&
|
|
source->ref_count == 1 &&
|
|
source->handle == NULL &&
|
|
(source->type == OBJT_DEFAULT ||
|
|
source->type == OBJT_SWAP))
|
|
return;
|
|
|
|
/*
|
|
* Allocate a new object with the given length
|
|
*/
|
|
|
|
if ((result = vm_object_allocate(OBJT_DEFAULT, length)) == NULL)
|
|
panic("vm_object_shadow: no object for shadowing");
|
|
|
|
/*
|
|
* The new object shadows the source object, adding a reference to it.
|
|
* Our caller changes his reference to point to the new object,
|
|
* removing a reference to the source object. Net result: no change
|
|
* of reference count.
|
|
*
|
|
* Try to optimize the result object's page color when shadowing
|
|
* in order to maintain page coloring consistency in the combined
|
|
* shadowed object.
|
|
*/
|
|
result->backing_object = source;
|
|
if (source) {
|
|
TAILQ_INSERT_TAIL(&source->shadow_head, result, shadow_list);
|
|
source->shadow_count++;
|
|
source->generation++;
|
|
result->pg_color = (source->pg_color + OFF_TO_IDX(*offset)) & PQ_L2_MASK;
|
|
}
|
|
|
|
/*
|
|
* Store the offset into the source object, and fix up the offset into
|
|
* the new object.
|
|
*/
|
|
|
|
result->backing_object_offset = *offset;
|
|
|
|
/*
|
|
* Return the new things
|
|
*/
|
|
|
|
*offset = 0;
|
|
*object = result;
|
|
}
|
|
|
|
#define OBSC_TEST_ALL_SHADOWED 0x0001
|
|
#define OBSC_COLLAPSE_NOWAIT 0x0002
|
|
#define OBSC_COLLAPSE_WAIT 0x0004
|
|
|
|
static __inline int
|
|
vm_object_backing_scan(vm_object_t object, int op)
|
|
{
|
|
int s;
|
|
int r = 1;
|
|
vm_page_t p;
|
|
vm_object_t backing_object;
|
|
vm_pindex_t backing_offset_index;
|
|
|
|
s = splvm();
|
|
|
|
backing_object = object->backing_object;
|
|
backing_offset_index = OFF_TO_IDX(object->backing_object_offset);
|
|
|
|
/*
|
|
* Initial conditions
|
|
*/
|
|
|
|
if (op & OBSC_TEST_ALL_SHADOWED) {
|
|
/*
|
|
* We do not want to have to test for the existence of
|
|
* swap pages in the backing object. XXX but with the
|
|
* new swapper this would be pretty easy to do.
|
|
*
|
|
* XXX what about anonymous MAP_SHARED memory that hasn't
|
|
* been ZFOD faulted yet? If we do not test for this, the
|
|
* shadow test may succeed! XXX
|
|
*/
|
|
if (backing_object->type != OBJT_DEFAULT) {
|
|
splx(s);
|
|
return(0);
|
|
}
|
|
}
|
|
if (op & OBSC_COLLAPSE_WAIT) {
|
|
vm_object_set_flag(backing_object, OBJ_DEAD);
|
|
}
|
|
|
|
/*
|
|
* Our scan
|
|
*/
|
|
|
|
p = TAILQ_FIRST(&backing_object->memq);
|
|
while (p) {
|
|
vm_page_t next = TAILQ_NEXT(p, listq);
|
|
vm_pindex_t new_pindex = p->pindex - backing_offset_index;
|
|
|
|
if (op & OBSC_TEST_ALL_SHADOWED) {
|
|
vm_page_t pp;
|
|
|
|
/*
|
|
* Ignore pages outside the parent object's range
|
|
* and outside the parent object's mapping of the
|
|
* backing object.
|
|
*
|
|
* note that we do not busy the backing object's
|
|
* page.
|
|
*/
|
|
|
|
if (
|
|
p->pindex < backing_offset_index ||
|
|
new_pindex >= object->size
|
|
) {
|
|
p = next;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* See if the parent has the page or if the parent's
|
|
* object pager has the page. If the parent has the
|
|
* page but the page is not valid, the parent's
|
|
* object pager must have the page.
|
|
*
|
|
* If this fails, the parent does not completely shadow
|
|
* the object and we might as well give up now.
|
|
*/
|
|
|
|
pp = vm_page_lookup(object, new_pindex);
|
|
if (
|
|
(pp == NULL || pp->valid == 0) &&
|
|
!vm_pager_has_page(object, new_pindex, NULL, NULL)
|
|
) {
|
|
r = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check for busy page
|
|
*/
|
|
|
|
if (op & (OBSC_COLLAPSE_WAIT | OBSC_COLLAPSE_NOWAIT)) {
|
|
vm_page_t pp;
|
|
|
|
if (op & OBSC_COLLAPSE_NOWAIT) {
|
|
if (
|
|
(p->flags & PG_BUSY) ||
|
|
!p->valid ||
|
|
p->hold_count ||
|
|
p->wire_count ||
|
|
p->busy
|
|
) {
|
|
p = next;
|
|
continue;
|
|
}
|
|
} else if (op & OBSC_COLLAPSE_WAIT) {
|
|
if (vm_page_sleep_busy(p, TRUE, "vmocol")) {
|
|
/*
|
|
* If we slept, anything could have
|
|
* happened. Since the object is
|
|
* marked dead, the backing offset
|
|
* should not have changed so we
|
|
* just restart our scan.
|
|
*/
|
|
p = TAILQ_FIRST(&backing_object->memq);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Busy the page
|
|
*/
|
|
vm_page_busy(p);
|
|
|
|
KASSERT(
|
|
p->object == backing_object,
|
|
("vm_object_qcollapse(): object mismatch")
|
|
);
|
|
|
|
/*
|
|
* Destroy any associated swap
|
|
*/
|
|
if (backing_object->type == OBJT_SWAP) {
|
|
swap_pager_freespace(
|
|
backing_object,
|
|
p->pindex,
|
|
1
|
|
);
|
|
}
|
|
|
|
if (
|
|
p->pindex < backing_offset_index ||
|
|
new_pindex >= object->size
|
|
) {
|
|
/*
|
|
* Page is out of the parent object's range, we
|
|
* can simply destroy it.
|
|
*/
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
p = next;
|
|
continue;
|
|
}
|
|
|
|
pp = vm_page_lookup(object, new_pindex);
|
|
if (
|
|
pp != NULL ||
|
|
vm_pager_has_page(object, new_pindex, NULL, NULL)
|
|
) {
|
|
/*
|
|
* page already exists in parent OR swap exists
|
|
* for this location in the parent. Destroy
|
|
* the original page from the backing object.
|
|
*
|
|
* Leave the parent's page alone
|
|
*/
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
p = next;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Page does not exist in parent, rename the
|
|
* page from the backing object to the main object.
|
|
*
|
|
* If the page was mapped to a process, it can remain
|
|
* mapped through the rename.
|
|
*/
|
|
if ((p->queue - p->pc) == PQ_CACHE)
|
|
vm_page_deactivate(p);
|
|
|
|
vm_page_rename(p, object, new_pindex);
|
|
/* page automatically made dirty by rename */
|
|
}
|
|
p = next;
|
|
}
|
|
splx(s);
|
|
return(r);
|
|
}
|
|
|
|
|
|
/*
|
|
* this version of collapse allows the operation to occur earlier and
|
|
* when paging_in_progress is true for an object... This is not a complete
|
|
* operation, but should plug 99.9% of the rest of the leaks.
|
|
*/
|
|
static void
|
|
vm_object_qcollapse(object)
|
|
vm_object_t object;
|
|
{
|
|
vm_object_t backing_object = object->backing_object;
|
|
|
|
if (backing_object->ref_count != 1)
|
|
return;
|
|
|
|
backing_object->ref_count += 2;
|
|
|
|
vm_object_backing_scan(object, OBSC_COLLAPSE_NOWAIT);
|
|
|
|
backing_object->ref_count -= 2;
|
|
}
|
|
|
|
/*
|
|
* vm_object_collapse:
|
|
*
|
|
* Collapse an object with the object backing it.
|
|
* Pages in the backing object are moved into the
|
|
* parent, and the backing object is deallocated.
|
|
*/
|
|
void
|
|
vm_object_collapse(object)
|
|
vm_object_t object;
|
|
{
|
|
while (TRUE) {
|
|
vm_object_t backing_object;
|
|
|
|
/*
|
|
* Verify that the conditions are right for collapse:
|
|
*
|
|
* The object exists and the backing object exists.
|
|
*/
|
|
if (object == NULL)
|
|
break;
|
|
|
|
if ((backing_object = object->backing_object) == NULL)
|
|
break;
|
|
|
|
/*
|
|
* we check the backing object first, because it is most likely
|
|
* not collapsable.
|
|
*/
|
|
if (backing_object->handle != NULL ||
|
|
(backing_object->type != OBJT_DEFAULT &&
|
|
backing_object->type != OBJT_SWAP) ||
|
|
(backing_object->flags & OBJ_DEAD) ||
|
|
object->handle != NULL ||
|
|
(object->type != OBJT_DEFAULT &&
|
|
object->type != OBJT_SWAP) ||
|
|
(object->flags & OBJ_DEAD)) {
|
|
break;
|
|
}
|
|
|
|
if (
|
|
object->paging_in_progress != 0 ||
|
|
backing_object->paging_in_progress != 0
|
|
) {
|
|
vm_object_qcollapse(object);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We know that we can either collapse the backing object (if
|
|
* the parent is the only reference to it) or (perhaps) have
|
|
* the parent bypass the object if the parent happens to shadow
|
|
* all the resident pages in the entire backing object.
|
|
*
|
|
* This is ignoring pager-backed pages such as swap pages.
|
|
* vm_object_backing_scan fails the shadowing test in this
|
|
* case.
|
|
*/
|
|
|
|
if (backing_object->ref_count == 1) {
|
|
/*
|
|
* If there is exactly one reference to the backing
|
|
* object, we can collapse it into the parent.
|
|
*/
|
|
|
|
vm_object_backing_scan(object, OBSC_COLLAPSE_WAIT);
|
|
|
|
/*
|
|
* Move the pager from backing_object to object.
|
|
*/
|
|
|
|
if (backing_object->type == OBJT_SWAP) {
|
|
vm_object_pip_add(backing_object, 1);
|
|
|
|
/*
|
|
* scrap the paging_offset junk and do a
|
|
* discrete copy. This also removes major
|
|
* assumptions about how the swap-pager
|
|
* works from where it doesn't belong. The
|
|
* new swapper is able to optimize the
|
|
* destroy-source case.
|
|
*/
|
|
|
|
vm_object_pip_add(object, 1);
|
|
swap_pager_copy(
|
|
backing_object,
|
|
object,
|
|
OFF_TO_IDX(object->backing_object_offset), TRUE);
|
|
vm_object_pip_wakeup(object);
|
|
|
|
vm_object_pip_wakeup(backing_object);
|
|
}
|
|
/*
|
|
* Object now shadows whatever backing_object did.
|
|
* Note that the reference to
|
|
* backing_object->backing_object moves from within
|
|
* backing_object to within object.
|
|
*/
|
|
|
|
TAILQ_REMOVE(
|
|
&object->backing_object->shadow_head,
|
|
object,
|
|
shadow_list
|
|
);
|
|
object->backing_object->shadow_count--;
|
|
object->backing_object->generation++;
|
|
if (backing_object->backing_object) {
|
|
TAILQ_REMOVE(
|
|
&backing_object->backing_object->shadow_head,
|
|
backing_object,
|
|
shadow_list
|
|
);
|
|
backing_object->backing_object->shadow_count--;
|
|
backing_object->backing_object->generation++;
|
|
}
|
|
object->backing_object = backing_object->backing_object;
|
|
if (object->backing_object) {
|
|
TAILQ_INSERT_TAIL(
|
|
&object->backing_object->shadow_head,
|
|
object,
|
|
shadow_list
|
|
);
|
|
object->backing_object->shadow_count++;
|
|
object->backing_object->generation++;
|
|
}
|
|
|
|
object->backing_object_offset +=
|
|
backing_object->backing_object_offset;
|
|
|
|
/*
|
|
* Discard backing_object.
|
|
*
|
|
* Since the backing object has no pages, no pager left,
|
|
* and no object references within it, all that is
|
|
* necessary is to dispose of it.
|
|
*/
|
|
|
|
TAILQ_REMOVE(
|
|
&vm_object_list,
|
|
backing_object,
|
|
object_list
|
|
);
|
|
vm_object_count--;
|
|
|
|
zfree(obj_zone, backing_object);
|
|
|
|
object_collapses++;
|
|
} else {
|
|
vm_object_t new_backing_object;
|
|
|
|
/*
|
|
* If we do not entirely shadow the backing object,
|
|
* there is nothing we can do so we give up.
|
|
*/
|
|
|
|
if (vm_object_backing_scan(object, OBSC_TEST_ALL_SHADOWED) == 0) {
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Make the parent shadow the next object in the
|
|
* chain. Deallocating backing_object will not remove
|
|
* it, since its reference count is at least 2.
|
|
*/
|
|
|
|
TAILQ_REMOVE(
|
|
&backing_object->shadow_head,
|
|
object,
|
|
shadow_list
|
|
);
|
|
backing_object->shadow_count--;
|
|
backing_object->generation++;
|
|
|
|
new_backing_object = backing_object->backing_object;
|
|
if ((object->backing_object = new_backing_object) != NULL) {
|
|
vm_object_reference(new_backing_object);
|
|
TAILQ_INSERT_TAIL(
|
|
&new_backing_object->shadow_head,
|
|
object,
|
|
shadow_list
|
|
);
|
|
new_backing_object->shadow_count++;
|
|
new_backing_object->generation++;
|
|
object->backing_object_offset +=
|
|
backing_object->backing_object_offset;
|
|
}
|
|
|
|
/*
|
|
* Drop the reference count on backing_object. Since
|
|
* its ref_count was at least 2, it will not vanish;
|
|
* so we don't need to call vm_object_deallocate, but
|
|
* we do anyway.
|
|
*/
|
|
vm_object_deallocate(backing_object);
|
|
object_bypasses++;
|
|
}
|
|
|
|
/*
|
|
* Try again with this object's new backing object.
|
|
*/
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_object_page_remove: [internal]
|
|
*
|
|
* Removes all physical pages in the specified
|
|
* object range from the object's list of pages.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
void
|
|
vm_object_page_remove(object, start, end, clean_only)
|
|
vm_object_t object;
|
|
vm_pindex_t start;
|
|
vm_pindex_t end;
|
|
boolean_t clean_only;
|
|
{
|
|
vm_page_t p, next;
|
|
unsigned int size;
|
|
int all;
|
|
|
|
if (object == NULL ||
|
|
object->resident_page_count == 0)
|
|
return;
|
|
|
|
all = ((end == 0) && (start == 0));
|
|
|
|
/*
|
|
* Since physically-backed objects do not use managed pages, we can't
|
|
* remove pages from the object (we must instead remove the page
|
|
* references, and then destroy the object).
|
|
*/
|
|
KASSERT(object->type != OBJT_PHYS, ("attempt to remove pages from a physical object"));
|
|
|
|
vm_object_pip_add(object, 1);
|
|
again:
|
|
size = end - start;
|
|
if (all || size > object->resident_page_count / 4) {
|
|
for (p = TAILQ_FIRST(&object->memq); p != NULL; p = next) {
|
|
next = TAILQ_NEXT(p, listq);
|
|
if (all || ((start <= p->pindex) && (p->pindex < end))) {
|
|
if (p->wire_count != 0) {
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
if (!clean_only)
|
|
p->valid = 0;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* The busy flags are only cleared at
|
|
* interrupt -- minimize the spl transitions
|
|
*/
|
|
|
|
if (vm_page_sleep_busy(p, TRUE, "vmopar"))
|
|
goto again;
|
|
|
|
if (clean_only && p->valid) {
|
|
vm_page_test_dirty(p);
|
|
if (p->valid & p->dirty)
|
|
continue;
|
|
}
|
|
|
|
vm_page_busy(p);
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
}
|
|
}
|
|
} else {
|
|
while (size > 0) {
|
|
if ((p = vm_page_lookup(object, start)) != 0) {
|
|
|
|
if (p->wire_count != 0) {
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
if (!clean_only)
|
|
p->valid = 0;
|
|
start += 1;
|
|
size -= 1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* The busy flags are only cleared at
|
|
* interrupt -- minimize the spl transitions
|
|
*/
|
|
if (vm_page_sleep_busy(p, TRUE, "vmopar"))
|
|
goto again;
|
|
|
|
if (clean_only && p->valid) {
|
|
vm_page_test_dirty(p);
|
|
if (p->valid & p->dirty) {
|
|
start += 1;
|
|
size -= 1;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
vm_page_busy(p);
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
}
|
|
start += 1;
|
|
size -= 1;
|
|
}
|
|
}
|
|
vm_object_pip_wakeup(object);
|
|
}
|
|
|
|
/*
|
|
* Routine: vm_object_coalesce
|
|
* Function: Coalesces two objects backing up adjoining
|
|
* regions of memory into a single object.
|
|
*
|
|
* returns TRUE if objects were combined.
|
|
*
|
|
* NOTE: Only works at the moment if the second object is NULL -
|
|
* if it's not, which object do we lock first?
|
|
*
|
|
* Parameters:
|
|
* prev_object First object to coalesce
|
|
* prev_offset Offset into prev_object
|
|
* next_object Second object into coalesce
|
|
* next_offset Offset into next_object
|
|
*
|
|
* prev_size Size of reference to prev_object
|
|
* next_size Size of reference to next_object
|
|
*
|
|
* Conditions:
|
|
* The object must *not* be locked.
|
|
*/
|
|
boolean_t
|
|
vm_object_coalesce(prev_object, prev_pindex, prev_size, next_size)
|
|
vm_object_t prev_object;
|
|
vm_pindex_t prev_pindex;
|
|
vm_size_t prev_size, next_size;
|
|
{
|
|
vm_pindex_t next_pindex;
|
|
|
|
if (prev_object == NULL) {
|
|
return (TRUE);
|
|
}
|
|
|
|
if (prev_object->type != OBJT_DEFAULT &&
|
|
prev_object->type != OBJT_SWAP) {
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* Try to collapse the object first
|
|
*/
|
|
vm_object_collapse(prev_object);
|
|
|
|
/*
|
|
* Can't coalesce if: . more than one reference . paged out . shadows
|
|
* another object . has a copy elsewhere (any of which mean that the
|
|
* pages not mapped to prev_entry may be in use anyway)
|
|
*/
|
|
|
|
if (prev_object->backing_object != NULL) {
|
|
return (FALSE);
|
|
}
|
|
|
|
prev_size >>= PAGE_SHIFT;
|
|
next_size >>= PAGE_SHIFT;
|
|
next_pindex = prev_pindex + prev_size;
|
|
|
|
if ((prev_object->ref_count > 1) &&
|
|
(prev_object->size != next_pindex)) {
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* Remove any pages that may still be in the object from a previous
|
|
* deallocation.
|
|
*/
|
|
if (next_pindex < prev_object->size) {
|
|
vm_object_page_remove(prev_object,
|
|
next_pindex,
|
|
next_pindex + next_size, FALSE);
|
|
if (prev_object->type == OBJT_SWAP)
|
|
swap_pager_freespace(prev_object,
|
|
next_pindex, next_size);
|
|
}
|
|
|
|
/*
|
|
* Extend the object if necessary.
|
|
*/
|
|
if (next_pindex + next_size > prev_object->size)
|
|
prev_object->size = next_pindex + next_size;
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <sys/kernel.h>
|
|
|
|
#include <sys/cons.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
|
|
static int _vm_object_in_map __P((vm_map_t map, vm_object_t object,
|
|
vm_map_entry_t entry));
|
|
static int vm_object_in_map __P((vm_object_t object));
|
|
|
|
static int
|
|
_vm_object_in_map(map, object, entry)
|
|
vm_map_t map;
|
|
vm_object_t object;
|
|
vm_map_entry_t entry;
|
|
{
|
|
vm_map_t tmpm;
|
|
vm_map_entry_t tmpe;
|
|
vm_object_t obj;
|
|
int entcount;
|
|
|
|
if (map == 0)
|
|
return 0;
|
|
|
|
if (entry == 0) {
|
|
tmpe = map->header.next;
|
|
entcount = map->nentries;
|
|
while (entcount-- && (tmpe != &map->header)) {
|
|
if( _vm_object_in_map(map, object, tmpe)) {
|
|
return 1;
|
|
}
|
|
tmpe = tmpe->next;
|
|
}
|
|
} else if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) {
|
|
tmpm = entry->object.sub_map;
|
|
tmpe = tmpm->header.next;
|
|
entcount = tmpm->nentries;
|
|
while (entcount-- && tmpe != &tmpm->header) {
|
|
if( _vm_object_in_map(tmpm, object, tmpe)) {
|
|
return 1;
|
|
}
|
|
tmpe = tmpe->next;
|
|
}
|
|
} else if ((obj = entry->object.vm_object) != NULL) {
|
|
for(; obj; obj=obj->backing_object)
|
|
if( obj == object) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
vm_object_in_map( object)
|
|
vm_object_t object;
|
|
{
|
|
struct proc *p;
|
|
lockmgr(&allproc_lock, LK_SHARED, NULL, CURPROC);
|
|
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
|
|
if( !p->p_vmspace /* || (p->p_flag & (P_SYSTEM|P_WEXIT)) */)
|
|
continue;
|
|
if( _vm_object_in_map(&p->p_vmspace->vm_map, object, 0)) {
|
|
lockmgr(&allproc_lock, LK_RELEASE, NULL, CURPROC);
|
|
return 1;
|
|
}
|
|
}
|
|
lockmgr(&allproc_lock, LK_RELEASE, NULL, CURPROC);
|
|
if( _vm_object_in_map( kernel_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( kmem_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( pager_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( buffer_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( mb_map, object, 0))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
DB_SHOW_COMMAND(vmochk, vm_object_check)
|
|
{
|
|
vm_object_t object;
|
|
|
|
/*
|
|
* make sure that internal objs are in a map somewhere
|
|
* and none have zero ref counts.
|
|
*/
|
|
for (object = TAILQ_FIRST(&vm_object_list);
|
|
object != NULL;
|
|
object = TAILQ_NEXT(object, object_list)) {
|
|
if (object->handle == NULL &&
|
|
(object->type == OBJT_DEFAULT || object->type == OBJT_SWAP)) {
|
|
if (object->ref_count == 0) {
|
|
db_printf("vmochk: internal obj has zero ref count: %ld\n",
|
|
(long)object->size);
|
|
}
|
|
if (!vm_object_in_map(object)) {
|
|
db_printf(
|
|
"vmochk: internal obj is not in a map: "
|
|
"ref: %d, size: %lu: 0x%lx, backing_object: %p\n",
|
|
object->ref_count, (u_long)object->size,
|
|
(u_long)object->size,
|
|
(void *)object->backing_object);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_object_print: [ debug ]
|
|
*/
|
|
DB_SHOW_COMMAND(object, vm_object_print_static)
|
|
{
|
|
/* XXX convert args. */
|
|
vm_object_t object = (vm_object_t)addr;
|
|
boolean_t full = have_addr;
|
|
|
|
vm_page_t p;
|
|
|
|
/* XXX count is an (unused) arg. Avoid shadowing it. */
|
|
#define count was_count
|
|
|
|
int count;
|
|
|
|
if (object == NULL)
|
|
return;
|
|
|
|
db_iprintf(
|
|
"Object %p: type=%d, size=0x%lx, res=%d, ref=%d, flags=0x%x\n",
|
|
object, (int)object->type, (u_long)object->size,
|
|
object->resident_page_count, object->ref_count, object->flags);
|
|
/*
|
|
* XXX no %qd in kernel. Truncate object->backing_object_offset.
|
|
*/
|
|
db_iprintf(" sref=%d, backing_object(%d)=(%p)+0x%lx\n",
|
|
object->shadow_count,
|
|
object->backing_object ? object->backing_object->ref_count : 0,
|
|
object->backing_object, (long)object->backing_object_offset);
|
|
|
|
if (!full)
|
|
return;
|
|
|
|
db_indent += 2;
|
|
count = 0;
|
|
for (p = TAILQ_FIRST(&object->memq); p != NULL; p = TAILQ_NEXT(p, listq)) {
|
|
if (count == 0)
|
|
db_iprintf("memory:=");
|
|
else if (count == 6) {
|
|
db_printf("\n");
|
|
db_iprintf(" ...");
|
|
count = 0;
|
|
} else
|
|
db_printf(",");
|
|
count++;
|
|
|
|
db_printf("(off=0x%lx,page=0x%lx)",
|
|
(u_long) p->pindex, (u_long) VM_PAGE_TO_PHYS(p));
|
|
}
|
|
if (count != 0)
|
|
db_printf("\n");
|
|
db_indent -= 2;
|
|
}
|
|
|
|
/* XXX. */
|
|
#undef count
|
|
|
|
/* XXX need this non-static entry for calling from vm_map_print. */
|
|
void
|
|
vm_object_print(addr, have_addr, count, modif)
|
|
/* db_expr_t */ long addr;
|
|
boolean_t have_addr;
|
|
/* db_expr_t */ long count;
|
|
char *modif;
|
|
{
|
|
vm_object_print_static(addr, have_addr, count, modif);
|
|
}
|
|
|
|
DB_SHOW_COMMAND(vmopag, vm_object_print_pages)
|
|
{
|
|
vm_object_t object;
|
|
int nl = 0;
|
|
int c;
|
|
for (object = TAILQ_FIRST(&vm_object_list);
|
|
object != NULL;
|
|
object = TAILQ_NEXT(object, object_list)) {
|
|
vm_pindex_t idx, fidx;
|
|
vm_pindex_t osize;
|
|
vm_offset_t pa = -1, padiff;
|
|
int rcount;
|
|
vm_page_t m;
|
|
|
|
db_printf("new object: %p\n", (void *)object);
|
|
if ( nl > 18) {
|
|
c = cngetc();
|
|
if (c != ' ')
|
|
return;
|
|
nl = 0;
|
|
}
|
|
nl++;
|
|
rcount = 0;
|
|
fidx = 0;
|
|
osize = object->size;
|
|
if (osize > 128)
|
|
osize = 128;
|
|
for(idx=0;idx<osize;idx++) {
|
|
m = vm_page_lookup(object, idx);
|
|
if (m == NULL) {
|
|
if (rcount) {
|
|
db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
|
|
(long)fidx, rcount, (long)pa);
|
|
if ( nl > 18) {
|
|
c = cngetc();
|
|
if (c != ' ')
|
|
return;
|
|
nl = 0;
|
|
}
|
|
nl++;
|
|
rcount = 0;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
|
|
if (rcount &&
|
|
(VM_PAGE_TO_PHYS(m) == pa + rcount * PAGE_SIZE)) {
|
|
++rcount;
|
|
continue;
|
|
}
|
|
if (rcount) {
|
|
padiff = pa + rcount * PAGE_SIZE - VM_PAGE_TO_PHYS(m);
|
|
padiff >>= PAGE_SHIFT;
|
|
padiff &= PQ_L2_MASK;
|
|
if (padiff == 0) {
|
|
pa = VM_PAGE_TO_PHYS(m) - rcount * PAGE_SIZE;
|
|
++rcount;
|
|
continue;
|
|
}
|
|
db_printf(" index(%ld)run(%d)pa(0x%lx)",
|
|
(long)fidx, rcount, (long)pa);
|
|
db_printf("pd(%ld)\n", (long)padiff);
|
|
if ( nl > 18) {
|
|
c = cngetc();
|
|
if (c != ' ')
|
|
return;
|
|
nl = 0;
|
|
}
|
|
nl++;
|
|
}
|
|
fidx = idx;
|
|
pa = VM_PAGE_TO_PHYS(m);
|
|
rcount = 1;
|
|
}
|
|
if (rcount) {
|
|
db_printf(" index(%ld)run(%d)pa(0x%lx)\n",
|
|
(long)fidx, rcount, (long)pa);
|
|
if ( nl > 18) {
|
|
c = cngetc();
|
|
if (c != ' ')
|
|
return;
|
|
nl = 0;
|
|
}
|
|
nl++;
|
|
}
|
|
}
|
|
}
|
|
#endif /* DDB */
|