eb95adeff5
casting them to long, etc. Fixed some nearby printf bogons (sign errors not warned about by gcc, and style bugs, but not truncation of vm_ooffset_t's).
1738 lines
42 KiB
C
1738 lines
42 KiB
C
/*
|
|
* Copyright (c) 1991, 1993
|
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* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* The Mach Operating System project at Carnegie-Mellon University.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
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*
|
|
* from: @(#)vm_object.c 8.5 (Berkeley) 3/22/94
|
|
*
|
|
*
|
|
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*
|
|
* $Id: vm_object.c,v 1.124 1998/07/11 11:30:45 bde Exp $
|
|
*/
|
|
|
|
/*
|
|
* Virtual memory object module.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h> /* for curproc, pageproc */
|
|
#include <sys/vnode.h>
|
|
#include <sys/vmmeter.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/mount.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_prot.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pageout.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/swap_pager.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/vm_zone.h>
|
|
|
|
static void vm_object_qcollapse __P((vm_object_t object));
|
|
static void vm_object_dispose __P((vm_object_t));
|
|
|
|
/*
|
|
* Virtual memory objects maintain the actual data
|
|
* associated with allocated virtual memory. A given
|
|
* page of memory exists within exactly one object.
|
|
*
|
|
* An object is only deallocated when all "references"
|
|
* are given up. Only one "reference" to a given
|
|
* region of an object should be writeable.
|
|
*
|
|
* Associated with each object is a list of all resident
|
|
* memory pages belonging to that object; this list is
|
|
* maintained by the "vm_page" module, and locked by the object's
|
|
* lock.
|
|
*
|
|
* Each object also records a "pager" routine which is
|
|
* used to retrieve (and store) pages to the proper backing
|
|
* storage. In addition, objects may be backed by other
|
|
* objects from which they were virtual-copied.
|
|
*
|
|
* The only items within the object structure which are
|
|
* modified after time of creation are:
|
|
* reference count locked by object's lock
|
|
* pager routine locked by object's lock
|
|
*
|
|
*/
|
|
|
|
struct object_q vm_object_list;
|
|
static struct simplelock vm_object_list_lock;
|
|
static long vm_object_count; /* count of all objects */
|
|
vm_object_t kernel_object;
|
|
vm_object_t kmem_object;
|
|
static struct vm_object kernel_object_store;
|
|
static struct vm_object kmem_object_store;
|
|
extern int vm_pageout_page_count;
|
|
|
|
static long object_collapses;
|
|
static long object_bypasses;
|
|
static int next_index;
|
|
static vm_zone_t obj_zone;
|
|
static struct vm_zone obj_zone_store;
|
|
#define VM_OBJECTS_INIT 256
|
|
static struct vm_object vm_objects_init[VM_OBJECTS_INIT];
|
|
static int objidnumber;
|
|
|
|
void
|
|
_vm_object_allocate(type, size, object)
|
|
objtype_t type;
|
|
vm_size_t size;
|
|
register vm_object_t object;
|
|
{
|
|
int incr;
|
|
TAILQ_INIT(&object->memq);
|
|
TAILQ_INIT(&object->shadow_head);
|
|
|
|
object->type = type;
|
|
object->size = size;
|
|
object->ref_count = 1;
|
|
object->flags = 0;
|
|
object->id = ++objidnumber;
|
|
if ((object->type == OBJT_DEFAULT) || (object->type == OBJT_SWAP))
|
|
object->flags |= OBJ_ONEMAPPING;
|
|
object->behavior = OBJ_NORMAL;
|
|
object->paging_in_progress = 0;
|
|
object->resident_page_count = 0;
|
|
object->cache_count = 0;
|
|
object->wire_count = 0;
|
|
object->shadow_count = 0;
|
|
object->pg_color = next_index;
|
|
if ( size > (PQ_L2_SIZE / 3 + PQ_PRIME1))
|
|
incr = PQ_L2_SIZE / 3 + PQ_PRIME1;
|
|
else
|
|
incr = size;
|
|
next_index = (next_index + incr) & PQ_L2_MASK;
|
|
object->handle = NULL;
|
|
object->paging_offset = (vm_ooffset_t) 0;
|
|
object->backing_object = NULL;
|
|
object->backing_object_offset = (vm_ooffset_t) 0;
|
|
object->page_hint = NULL;
|
|
|
|
object->last_read = 0;
|
|
object->generation++;
|
|
|
|
TAILQ_INSERT_TAIL(&vm_object_list, object, object_list);
|
|
vm_object_count++;
|
|
}
|
|
|
|
/*
|
|
* vm_object_init:
|
|
*
|
|
* Initialize the VM objects module.
|
|
*/
|
|
void
|
|
vm_object_init()
|
|
{
|
|
TAILQ_INIT(&vm_object_list);
|
|
simple_lock_init(&vm_object_list_lock);
|
|
vm_object_count = 0;
|
|
|
|
kernel_object = &kernel_object_store;
|
|
_vm_object_allocate(OBJT_DEFAULT, OFF_TO_IDX(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS),
|
|
kernel_object);
|
|
|
|
kmem_object = &kmem_object_store;
|
|
_vm_object_allocate(OBJT_DEFAULT, OFF_TO_IDX(VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS),
|
|
kmem_object);
|
|
|
|
obj_zone = &obj_zone_store;
|
|
zbootinit(obj_zone, "VM OBJECT", sizeof (struct vm_object),
|
|
vm_objects_init, VM_OBJECTS_INIT);
|
|
}
|
|
|
|
void
|
|
vm_object_init2() {
|
|
zinitna(obj_zone, NULL, NULL, 0, 0, 0, 1);
|
|
}
|
|
|
|
/*
|
|
* vm_object_allocate:
|
|
*
|
|
* Returns a new object with the given size.
|
|
*/
|
|
|
|
vm_object_t
|
|
vm_object_allocate(type, size)
|
|
objtype_t type;
|
|
vm_size_t size;
|
|
{
|
|
register vm_object_t result;
|
|
result = (vm_object_t) zalloc(obj_zone);
|
|
|
|
_vm_object_allocate(type, size, result);
|
|
|
|
return (result);
|
|
}
|
|
|
|
|
|
/*
|
|
* vm_object_reference:
|
|
*
|
|
* Gets another reference to the given object.
|
|
*/
|
|
void
|
|
vm_object_reference(object)
|
|
register vm_object_t object;
|
|
{
|
|
if (object == NULL)
|
|
return;
|
|
|
|
#if defined(DIAGNOSTIC)
|
|
if (object->flags & OBJ_DEAD)
|
|
panic("vm_object_reference: attempting to reference dead obj");
|
|
#endif
|
|
|
|
object->ref_count++;
|
|
if (object->type == OBJT_VNODE) {
|
|
while (vget((struct vnode *) object->handle, LK_RETRY|LK_NOOBJ, curproc)) {
|
|
#if !defined(MAX_PERF)
|
|
printf("vm_object_reference: delay in getting object\n");
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
vm_object_vndeallocate(object)
|
|
vm_object_t object;
|
|
{
|
|
struct vnode *vp = (struct vnode *) object->handle;
|
|
#if defined(DIAGNOSTIC)
|
|
if (object->type != OBJT_VNODE)
|
|
panic("vm_object_vndeallocate: not a vnode object");
|
|
if (vp == NULL)
|
|
panic("vm_object_vndeallocate: missing vp");
|
|
if (object->ref_count == 0) {
|
|
vprint("vm_object_vndeallocate", vp);
|
|
panic("vm_object_vndeallocate: bad object reference count");
|
|
}
|
|
#endif
|
|
|
|
object->ref_count--;
|
|
if (object->ref_count == 0) {
|
|
vp->v_flag &= ~VTEXT;
|
|
object->flags &= ~OBJ_OPT;
|
|
}
|
|
vrele(vp);
|
|
}
|
|
|
|
/*
|
|
* vm_object_deallocate:
|
|
*
|
|
* Release a reference to the specified object,
|
|
* gained either through a vm_object_allocate
|
|
* or a vm_object_reference call. When all references
|
|
* are gone, storage associated with this object
|
|
* may be relinquished.
|
|
*
|
|
* No object may be locked.
|
|
*/
|
|
void
|
|
vm_object_deallocate(object)
|
|
vm_object_t object;
|
|
{
|
|
int s;
|
|
vm_object_t temp;
|
|
|
|
while (object != NULL) {
|
|
|
|
if (object->type == OBJT_VNODE) {
|
|
vm_object_vndeallocate(object);
|
|
return;
|
|
}
|
|
|
|
if (object->ref_count == 0) {
|
|
panic("vm_object_deallocate: object deallocated too many times: %d", object->type);
|
|
} else if (object->ref_count > 2) {
|
|
object->ref_count--;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Here on ref_count of one or two, which are special cases for
|
|
* objects.
|
|
*/
|
|
if ((object->ref_count == 2) && (object->shadow_count == 0)) {
|
|
object->flags |= OBJ_ONEMAPPING;
|
|
object->ref_count--;
|
|
return;
|
|
} else if ((object->ref_count == 2) && (object->shadow_count == 1)) {
|
|
object->ref_count--;
|
|
if ((object->handle == NULL) &&
|
|
(object->type == OBJT_DEFAULT ||
|
|
object->type == OBJT_SWAP)) {
|
|
vm_object_t robject;
|
|
|
|
robject = TAILQ_FIRST(&object->shadow_head);
|
|
#if defined(DIAGNOSTIC)
|
|
if (robject == NULL)
|
|
panic("vm_object_deallocate: ref_count: %d,"
|
|
" shadow_count: %d",
|
|
object->ref_count, object->shadow_count);
|
|
#endif
|
|
if ((robject->handle == NULL) &&
|
|
(robject->type == OBJT_DEFAULT ||
|
|
robject->type == OBJT_SWAP)) {
|
|
|
|
robject->ref_count++;
|
|
|
|
retry:
|
|
if (robject->paging_in_progress ||
|
|
object->paging_in_progress) {
|
|
vm_object_pip_sleep(robject, "objde1");
|
|
if (robject->paging_in_progress &&
|
|
robject->type == OBJT_SWAP) {
|
|
swap_pager_sync();
|
|
goto retry;
|
|
}
|
|
|
|
vm_object_pip_sleep(object, "objde2");
|
|
if (object->paging_in_progress &&
|
|
object->type == OBJT_SWAP) {
|
|
swap_pager_sync();
|
|
}
|
|
goto retry;
|
|
}
|
|
|
|
if( robject->ref_count == 1) {
|
|
robject->ref_count--;
|
|
object = robject;
|
|
goto doterm;
|
|
}
|
|
|
|
object = robject;
|
|
vm_object_collapse(object);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
} else {
|
|
object->ref_count--;
|
|
if (object->ref_count != 0)
|
|
return;
|
|
}
|
|
|
|
doterm:
|
|
|
|
temp = object->backing_object;
|
|
if (temp) {
|
|
TAILQ_REMOVE(&temp->shadow_head, object, shadow_list);
|
|
temp->shadow_count--;
|
|
if (temp->ref_count == 0)
|
|
temp->flags &= ~OBJ_OPT;
|
|
temp->generation++;
|
|
object->backing_object = NULL;
|
|
}
|
|
vm_object_terminate(object);
|
|
/* unlocks and deallocates object */
|
|
object = temp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_object_terminate actually destroys the specified object, freeing
|
|
* up all previously used resources.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
void
|
|
vm_object_terminate(object)
|
|
register vm_object_t object;
|
|
{
|
|
register vm_page_t p;
|
|
int s;
|
|
|
|
/*
|
|
* Make sure no one uses us.
|
|
*/
|
|
object->flags |= OBJ_DEAD;
|
|
|
|
/*
|
|
* wait for the pageout daemon to be done with the object
|
|
*/
|
|
vm_object_pip_wait(object, "objtrm");
|
|
|
|
#if defined(DIAGNOSTIC)
|
|
if (object->paging_in_progress != 0)
|
|
panic("vm_object_terminate: pageout in progress");
|
|
#endif
|
|
|
|
/*
|
|
* Clean and free the pages, as appropriate. All references to the
|
|
* object are gone, so we don't need to lock it.
|
|
*/
|
|
if (object->type == OBJT_VNODE) {
|
|
struct vnode *vp;
|
|
|
|
/*
|
|
* Freeze optimized copies.
|
|
*/
|
|
vm_freeze_copyopts(object, 0, object->size);
|
|
|
|
/*
|
|
* Clean pages and flush buffers.
|
|
*/
|
|
vm_object_page_clean(object, 0, 0, OBJPC_SYNC);
|
|
|
|
vp = (struct vnode *) object->handle;
|
|
vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0);
|
|
|
|
/*
|
|
* Let the pager know object is dead.
|
|
*/
|
|
vm_pager_deallocate(object);
|
|
|
|
}
|
|
|
|
if ((object->type != OBJT_VNODE) && (object->ref_count == 0)) {
|
|
|
|
/*
|
|
* Now free the pages. For internal objects, this also removes them
|
|
* from paging queues.
|
|
*/
|
|
while ((p = TAILQ_FIRST(&object->memq)) != NULL) {
|
|
#if !defined(MAX_PERF)
|
|
if (p->busy || (p->flags & PG_BUSY))
|
|
printf("vm_object_terminate: freeing busy page\n");
|
|
#endif
|
|
p->flags |= PG_BUSY;
|
|
vm_page_free(p);
|
|
cnt.v_pfree++;
|
|
}
|
|
/*
|
|
* Let the pager know object is dead.
|
|
*/
|
|
vm_pager_deallocate(object);
|
|
|
|
}
|
|
|
|
if ((object->ref_count == 0) && (object->resident_page_count == 0))
|
|
vm_object_dispose(object);
|
|
}
|
|
|
|
/*
|
|
* vm_object_dispose
|
|
*
|
|
* Dispose the object.
|
|
*/
|
|
static void
|
|
vm_object_dispose(object)
|
|
vm_object_t object;
|
|
{
|
|
simple_lock(&vm_object_list_lock);
|
|
TAILQ_REMOVE(&vm_object_list, object, object_list);
|
|
vm_object_count--;
|
|
simple_unlock(&vm_object_list_lock);
|
|
/*
|
|
* Free the space for the object.
|
|
*/
|
|
zfree(obj_zone, object);
|
|
wakeup(object);
|
|
}
|
|
|
|
/*
|
|
* vm_object_page_clean
|
|
*
|
|
* Clean all dirty pages in the specified range of object.
|
|
* Leaves page on whatever queue it is currently on.
|
|
*
|
|
* Odd semantics: if start == end, we clean everything.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
|
|
void
|
|
vm_object_page_clean(object, start, end, flags)
|
|
vm_object_t object;
|
|
vm_pindex_t start;
|
|
vm_pindex_t end;
|
|
int flags;
|
|
{
|
|
register vm_page_t p, np, tp;
|
|
register vm_offset_t tstart, tend;
|
|
vm_pindex_t pi;
|
|
int s;
|
|
struct vnode *vp;
|
|
int runlen;
|
|
int maxf;
|
|
int chkb;
|
|
int maxb;
|
|
int i;
|
|
int pagerflags;
|
|
vm_page_t maf[vm_pageout_page_count];
|
|
vm_page_t mab[vm_pageout_page_count];
|
|
vm_page_t ma[vm_pageout_page_count];
|
|
int curgeneration;
|
|
struct proc *pproc = curproc; /* XXX */
|
|
|
|
if (object->type != OBJT_VNODE ||
|
|
(object->flags & OBJ_MIGHTBEDIRTY) == 0)
|
|
return;
|
|
|
|
pagerflags = (flags & (OBJPC_SYNC | OBJPC_INVAL)) ? VM_PAGER_PUT_SYNC : 0;
|
|
pagerflags |= (flags & OBJPC_INVAL) ? VM_PAGER_PUT_INVAL : 0;
|
|
|
|
vp = object->handle;
|
|
|
|
object->flags |= OBJ_CLEANING;
|
|
|
|
tstart = start;
|
|
if (end == 0) {
|
|
tend = object->size;
|
|
} else {
|
|
tend = end;
|
|
}
|
|
|
|
for(p = TAILQ_FIRST(&object->memq); p; p = TAILQ_NEXT(p, listq)) {
|
|
p->flags |= PG_CLEANCHK;
|
|
vm_page_protect(p, VM_PROT_READ);
|
|
}
|
|
|
|
if ((tstart == 0) && (tend == object->size)) {
|
|
object->flags &= ~(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)) {
|
|
p->flags &= ~PG_CLEANCHK;
|
|
continue;
|
|
}
|
|
|
|
vm_page_test_dirty(p);
|
|
if ((p->dirty & p->valid) == 0) {
|
|
p->flags &= ~PG_CLEANCHK;
|
|
continue;
|
|
}
|
|
|
|
s = splvm();
|
|
while ((p->flags & PG_BUSY) || p->busy) {
|
|
p->flags |= PG_WANTED | PG_REFERENCED;
|
|
tsleep(p, PVM, "vpcwai", 0);
|
|
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)) {
|
|
if ((tp->flags & PG_BUSY) ||
|
|
(tp->flags & PG_CLEANCHK) == 0 ||
|
|
(tp->busy != 0))
|
|
break;
|
|
if((tp->queue - tp->pc) == PQ_CACHE) {
|
|
tp->flags &= ~PG_CLEANCHK;
|
|
break;
|
|
}
|
|
vm_page_test_dirty(tp);
|
|
if ((tp->dirty & tp->valid) == 0) {
|
|
tp->flags &= ~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)) {
|
|
if ((tp->flags & PG_BUSY) ||
|
|
(tp->flags & PG_CLEANCHK) == 0 ||
|
|
(tp->busy != 0))
|
|
break;
|
|
if((tp->queue - tp->pc) == PQ_CACHE) {
|
|
tp->flags &= ~PG_CLEANCHK;
|
|
break;
|
|
}
|
|
vm_page_test_dirty(tp);
|
|
if ((tp->dirty & tp->valid) == 0) {
|
|
tp->flags &= ~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];
|
|
ma[index]->flags &= ~PG_CLEANCHK;
|
|
}
|
|
p->flags &= ~PG_CLEANCHK;
|
|
ma[maxb] = p;
|
|
for(i=0;i<maxf;i++) {
|
|
int index = (maxb + i) + 1;
|
|
ma[index] = maf[i];
|
|
ma[index]->flags &= ~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);
|
|
ma[i]->flags |= PG_CLEANCHK;
|
|
}
|
|
}
|
|
if (object->generation != curgeneration)
|
|
goto rescan;
|
|
}
|
|
|
|
VOP_FSYNC(vp, NULL, (pagerflags & VM_PAGER_PUT_SYNC)?MNT_WAIT:0, curproc);
|
|
|
|
object->flags &= ~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)
|
|
register vm_object_t object;
|
|
{
|
|
register 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
|
|
|
|
/*
|
|
* vm_object_pmap_copy:
|
|
*
|
|
* Makes all physical pages in the specified
|
|
* object range copy-on-write. No writeable
|
|
* references to these pages should remain.
|
|
*
|
|
* The object must *not* be locked.
|
|
*/
|
|
void
|
|
vm_object_pmap_copy(object, start, end)
|
|
register vm_object_t object;
|
|
register vm_pindex_t start;
|
|
register vm_pindex_t end;
|
|
{
|
|
register vm_page_t p;
|
|
|
|
if (object == NULL || (object->flags & OBJ_WRITEABLE) == 0)
|
|
return;
|
|
|
|
for (p = TAILQ_FIRST(&object->memq);
|
|
p != NULL;
|
|
p = TAILQ_NEXT(p, listq)) {
|
|
vm_page_protect(p, VM_PROT_READ);
|
|
}
|
|
|
|
object->flags &= ~OBJ_WRITEABLE;
|
|
}
|
|
|
|
/*
|
|
* Same as vm_object_pmap_copy_1, except range checking really
|
|
* works, and is meant for small sections of an object.
|
|
*/
|
|
void
|
|
vm_object_pmap_copy_1(object, start, end)
|
|
register vm_object_t object;
|
|
register vm_pindex_t start;
|
|
register vm_pindex_t end;
|
|
{
|
|
vm_pindex_t idx;
|
|
register 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)
|
|
register vm_object_t object;
|
|
register vm_pindex_t start;
|
|
register vm_pindex_t end;
|
|
{
|
|
register 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))
|
|
object->flags &= ~OBJ_WRITEABLE;
|
|
}
|
|
|
|
/*
|
|
* vm_object_madvise:
|
|
*
|
|
* Implements the madvise function at the object/page level.
|
|
*/
|
|
void
|
|
vm_object_madvise(object, pindex, count, advise)
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
int count;
|
|
int advise;
|
|
{
|
|
int s;
|
|
vm_pindex_t end, tpindex;
|
|
vm_object_t tobject;
|
|
vm_page_t m;
|
|
|
|
if (object == NULL)
|
|
return;
|
|
|
|
end = pindex + count;
|
|
|
|
for (; pindex < end; pindex += 1) {
|
|
|
|
relookup:
|
|
tobject = object;
|
|
tpindex = pindex;
|
|
shadowlookup:
|
|
m = vm_page_lookup(tobject, tpindex);
|
|
if (m == NULL) {
|
|
if (tobject->type != OBJT_DEFAULT) {
|
|
continue;
|
|
}
|
|
|
|
tobject = tobject->backing_object;
|
|
if ((tobject == NULL) || (tobject->ref_count != 1)) {
|
|
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. Things can break if we mess with pages
|
|
* in any of the below states.
|
|
*/
|
|
if (m->hold_count || m->wire_count ||
|
|
m->valid != VM_PAGE_BITS_ALL) {
|
|
continue;
|
|
}
|
|
|
|
if (vm_page_sleep(m, "madvpo", &m->busy))
|
|
goto relookup;
|
|
|
|
if (advise == MADV_WILLNEED) {
|
|
vm_page_activate(m);
|
|
} else if (advise == MADV_DONTNEED) {
|
|
vm_page_deactivate(m);
|
|
} else if (advise == MADV_FREE) {
|
|
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
|
|
m->dirty = 0;
|
|
/*
|
|
* Force a demand zero if attempt to read from swap.
|
|
* We currently don't handle vnode files correctly,
|
|
* and will reread stale contents unnecessarily.
|
|
*/
|
|
if (object->type == OBJT_SWAP)
|
|
swap_pager_dmzspace(tobject, m->pindex, 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;
|
|
{
|
|
register vm_object_t source;
|
|
register vm_object_t result;
|
|
|
|
source = *object;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
result->backing_object = source;
|
|
if (source) {
|
|
TAILQ_INSERT_TAIL(&source->shadow_head, result, shadow_list);
|
|
source->flags &= ~OBJ_ONEMAPPING;
|
|
source->shadow_count++;
|
|
source->generation++;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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)
|
|
register vm_object_t object;
|
|
{
|
|
register vm_object_t backing_object;
|
|
register vm_pindex_t backing_offset_index, paging_offset_index;
|
|
vm_pindex_t backing_object_paging_offset_index;
|
|
vm_pindex_t new_pindex;
|
|
register vm_page_t p, pp;
|
|
register vm_size_t size;
|
|
|
|
backing_object = object->backing_object;
|
|
if (backing_object->ref_count != 1)
|
|
return;
|
|
|
|
backing_object->ref_count += 2;
|
|
|
|
backing_offset_index = OFF_TO_IDX(object->backing_object_offset);
|
|
backing_object_paging_offset_index = OFF_TO_IDX(backing_object->paging_offset);
|
|
paging_offset_index = OFF_TO_IDX(object->paging_offset);
|
|
size = object->size;
|
|
p = TAILQ_FIRST(&backing_object->memq);
|
|
while (p) {
|
|
vm_page_t next;
|
|
|
|
next = TAILQ_NEXT(p, listq);
|
|
if ((p->flags & (PG_BUSY | PG_FICTITIOUS)) ||
|
|
!p->valid || p->hold_count || p->wire_count || p->busy) {
|
|
p = next;
|
|
continue;
|
|
}
|
|
p->flags |= PG_BUSY;
|
|
|
|
new_pindex = p->pindex - backing_offset_index;
|
|
if (p->pindex < backing_offset_index ||
|
|
new_pindex >= size) {
|
|
if (backing_object->type == OBJT_SWAP)
|
|
swap_pager_freespace(backing_object,
|
|
backing_object_paging_offset_index+p->pindex,
|
|
1);
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
} else {
|
|
pp = vm_page_lookup(object, new_pindex);
|
|
if (pp != NULL ||
|
|
(object->type == OBJT_SWAP && vm_pager_has_page(object,
|
|
paging_offset_index + new_pindex, NULL, NULL))) {
|
|
if (backing_object->type == OBJT_SWAP)
|
|
swap_pager_freespace(backing_object,
|
|
backing_object_paging_offset_index + p->pindex, 1);
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
} else {
|
|
if (backing_object->type == OBJT_SWAP)
|
|
swap_pager_freespace(backing_object,
|
|
backing_object_paging_offset_index + p->pindex, 1);
|
|
|
|
if ((p->queue - p->pc) == PQ_CACHE)
|
|
vm_page_deactivate(p);
|
|
else
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
|
|
vm_page_rename(p, object, new_pindex);
|
|
p->dirty = VM_PAGE_BITS_ALL;
|
|
}
|
|
}
|
|
p = next;
|
|
}
|
|
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;
|
|
|
|
{
|
|
vm_object_t backing_object;
|
|
vm_ooffset_t backing_offset;
|
|
vm_size_t size;
|
|
vm_pindex_t new_pindex, backing_offset_index;
|
|
vm_page_t p, pp;
|
|
|
|
while (TRUE) {
|
|
/*
|
|
* Verify that the conditions are right for collapse:
|
|
*
|
|
* The object exists and no pages in it are currently being paged
|
|
* out.
|
|
*/
|
|
if (object == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Make sure there is a backing object.
|
|
*/
|
|
if ((backing_object = object->backing_object) == NULL)
|
|
return;
|
|
|
|
/*
|
|
* 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)) {
|
|
return;
|
|
}
|
|
|
|
if (object->paging_in_progress != 0 ||
|
|
backing_object->paging_in_progress != 0) {
|
|
vm_object_qcollapse(object);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We know that we can either collapse the backing object (if
|
|
* the parent is the only reference to it) or (perhaps) remove
|
|
* the parent's reference to it.
|
|
*/
|
|
|
|
backing_offset = object->backing_object_offset;
|
|
backing_offset_index = OFF_TO_IDX(backing_offset);
|
|
size = object->size;
|
|
|
|
/*
|
|
* If there is exactly one reference to the backing object, we
|
|
* can collapse it into the parent.
|
|
*/
|
|
|
|
if (backing_object->ref_count == 1) {
|
|
|
|
backing_object->flags |= OBJ_DEAD;
|
|
/*
|
|
* We can collapse the backing object.
|
|
*
|
|
* Move all in-memory pages from backing_object to the
|
|
* parent. Pages that have been paged out will be
|
|
* overwritten by any of the parent's pages that
|
|
* shadow them.
|
|
*/
|
|
|
|
while ((p = TAILQ_FIRST(&backing_object->memq)) != 0) {
|
|
|
|
new_pindex = p->pindex - backing_offset_index;
|
|
p->flags |= PG_BUSY;
|
|
|
|
/*
|
|
* If the parent has a page here, or if this
|
|
* page falls outside the parent, dispose of
|
|
* it.
|
|
*
|
|
* Otherwise, move it as planned.
|
|
*/
|
|
|
|
if (p->pindex < backing_offset_index ||
|
|
new_pindex >= size) {
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
} else {
|
|
pp = vm_page_lookup(object, new_pindex);
|
|
if (pp != NULL || (object->type == OBJT_SWAP && vm_pager_has_page(object,
|
|
OFF_TO_IDX(object->paging_offset) + new_pindex, NULL, NULL))) {
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_free(p);
|
|
} else {
|
|
if ((p->queue - p->pc) == PQ_CACHE)
|
|
vm_page_deactivate(p);
|
|
else
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
vm_page_rename(p, object, new_pindex);
|
|
p->dirty = VM_PAGE_BITS_ALL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Move the pager from backing_object to object.
|
|
*/
|
|
|
|
if (backing_object->type == OBJT_SWAP) {
|
|
backing_object->paging_in_progress++;
|
|
if (object->type == OBJT_SWAP) {
|
|
object->paging_in_progress++;
|
|
/*
|
|
* copy shadow object pages into ours
|
|
* and destroy unneeded pages in
|
|
* shadow object.
|
|
*/
|
|
swap_pager_copy(
|
|
backing_object,
|
|
OFF_TO_IDX(backing_object->paging_offset),
|
|
object,
|
|
OFF_TO_IDX(object->paging_offset),
|
|
OFF_TO_IDX(object->backing_object_offset), TRUE);
|
|
vm_object_pip_wakeup(object);
|
|
} else {
|
|
object->paging_in_progress++;
|
|
/*
|
|
* move the shadow backing_object's pager data to
|
|
* "object" and convert "object" type to OBJT_SWAP.
|
|
*/
|
|
object->type = OBJT_SWAP;
|
|
object->un_pager.swp.swp_nblocks =
|
|
backing_object->un_pager.swp.swp_nblocks;
|
|
object->un_pager.swp.swp_allocsize =
|
|
backing_object->un_pager.swp.swp_allocsize;
|
|
object->un_pager.swp.swp_blocks =
|
|
backing_object->un_pager.swp.swp_blocks;
|
|
object->un_pager.swp.swp_poip = /* XXX */
|
|
backing_object->un_pager.swp.swp_poip;
|
|
object->paging_offset = backing_object->paging_offset + backing_offset;
|
|
TAILQ_INSERT_TAIL(&swap_pager_un_object_list, object, pager_object_list);
|
|
|
|
/*
|
|
* Convert backing object from OBJT_SWAP to
|
|
* OBJT_DEFAULT. XXX - only the TAILQ_REMOVE is
|
|
* actually necessary.
|
|
*/
|
|
backing_object->type = OBJT_DEFAULT;
|
|
TAILQ_REMOVE(&swap_pager_un_object_list, backing_object, pager_object_list);
|
|
/*
|
|
* free unnecessary blocks
|
|
*/
|
|
swap_pager_freespace(object, 0,
|
|
OFF_TO_IDX(object->paging_offset));
|
|
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 all of the pages in the backing object are
|
|
* shadowed by the parent object, the parent object no
|
|
* longer has to shadow the backing object; it can
|
|
* shadow the next one in the chain.
|
|
*
|
|
* The backing object must not be paged out - we'd have
|
|
* to check all of the paged-out pages, as well.
|
|
*/
|
|
|
|
if (backing_object->type != OBJT_DEFAULT) {
|
|
return;
|
|
}
|
|
/*
|
|
* Should have a check for a 'small' number of pages
|
|
* here.
|
|
*/
|
|
|
|
for (p = TAILQ_FIRST(&backing_object->memq); p;
|
|
p = TAILQ_NEXT(p, listq)) {
|
|
|
|
new_pindex = p->pindex - backing_offset_index;
|
|
p->flags |= PG_BUSY;
|
|
|
|
/*
|
|
* If the parent has a page here, or if this
|
|
* page falls outside the parent, keep going.
|
|
*
|
|
* Otherwise, the backing_object must be left in
|
|
* the chain.
|
|
*/
|
|
|
|
if (p->pindex >= backing_offset_index &&
|
|
new_pindex <= size) {
|
|
|
|
pp = vm_page_lookup(object, new_pindex);
|
|
|
|
if ((pp == NULL) || (pp->flags & PG_BUSY) || pp->busy) {
|
|
PAGE_WAKEUP(p);
|
|
return;
|
|
}
|
|
|
|
pp->flags |= PG_BUSY;
|
|
if ((pp->valid == 0) &&
|
|
!vm_pager_has_page(object, OFF_TO_IDX(object->paging_offset) + new_pindex, NULL, NULL)) {
|
|
/*
|
|
* Page still needed. Can't go any
|
|
* further.
|
|
*/
|
|
PAGE_WAKEUP(pp);
|
|
PAGE_WAKEUP(p);
|
|
return;
|
|
}
|
|
PAGE_WAKEUP(pp);
|
|
}
|
|
PAGE_WAKEUP(p);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
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)
|
|
register vm_object_t object;
|
|
register vm_pindex_t start;
|
|
register vm_pindex_t end;
|
|
boolean_t clean_only;
|
|
{
|
|
register vm_page_t p, next;
|
|
unsigned int size;
|
|
int s, all;
|
|
|
|
if (object == NULL)
|
|
return;
|
|
|
|
all = ((end == 0) && (start == 0));
|
|
|
|
object->paging_in_progress++;
|
|
again:
|
|
size = end - start;
|
|
if (all || size > 4 || size >= object->size / 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);
|
|
p->valid = 0;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* The busy flags are only cleared at
|
|
* interrupt -- minimize the spl transitions
|
|
*/
|
|
|
|
if (vm_page_sleep(p, "vmopar", &p->busy))
|
|
goto again;
|
|
|
|
if (clean_only && p->valid) {
|
|
vm_page_test_dirty(p);
|
|
if (p->valid & p->dirty)
|
|
continue;
|
|
}
|
|
|
|
p->flags |= PG_BUSY;
|
|
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) {
|
|
p->valid = 0;
|
|
vm_page_protect(p, VM_PROT_NONE);
|
|
start += 1;
|
|
size -= 1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* The busy flags are only cleared at
|
|
* interrupt -- minimize the spl transitions
|
|
*/
|
|
if (vm_page_sleep(p, "vmopar", &p->busy))
|
|
goto again;
|
|
|
|
if (clean_only && p->valid) {
|
|
vm_page_test_dirty(p);
|
|
if (p->valid & p->dirty) {
|
|
start += 1;
|
|
size -= 1;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
p->flags |= PG_BUSY;
|
|
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)
|
|
register vm_object_t prev_object;
|
|
vm_pindex_t prev_pindex;
|
|
vm_size_t prev_size, next_size;
|
|
{
|
|
vm_size_t newsize;
|
|
|
|
if (prev_object == NULL) {
|
|
return (TRUE);
|
|
}
|
|
|
|
if (prev_object->type != OBJT_DEFAULT) {
|
|
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;
|
|
|
|
if ((prev_object->ref_count > 1) &&
|
|
(prev_object->size != prev_pindex + prev_size)) {
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* Remove any pages that may still be in the object from a previous
|
|
* deallocation.
|
|
*/
|
|
|
|
vm_object_page_remove(prev_object,
|
|
prev_pindex + prev_size,
|
|
prev_pindex + prev_size + next_size, FALSE);
|
|
|
|
/*
|
|
* Extend the object if necessary.
|
|
*/
|
|
newsize = prev_pindex + prev_size + next_size;
|
|
if (newsize > prev_object->size)
|
|
prev_object->size = newsize;
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <sys/kernel.h>
|
|
|
|
#include <machine/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_A_MAP|MAP_ENTRY_IS_SUB_MAP)) {
|
|
tmpm = entry->object.share_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) {
|
|
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;
|
|
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))
|
|
return 1;
|
|
}
|
|
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( io_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( phys_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( mb_map, object, 0))
|
|
return 1;
|
|
if( _vm_object_in_map( u_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: %d\n",
|
|
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;
|
|
|
|
register vm_page_t p;
|
|
|
|
/* XXX count is an (unused) arg. Avoid shadowing it. */
|
|
#define count was_count
|
|
|
|
register 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->paging_offset and
|
|
* object->backing_object_offset.
|
|
*/
|
|
db_iprintf(" sref=%d, offset=0x%lx, backing_object(%d)=(%p)+0x%lx\n",
|
|
object->shadow_count, (long)object->paging_offset,
|
|
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(%d)run(%d)pa(0x%x)\n",
|
|
fidx, rcount, 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(%d)run(%d)pa(0x%x)", fidx, rcount, pa);
|
|
db_printf("pd(%d)\n", 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(%d)run(%d)pa(0x%x)\n", fidx, rcount, pa);
|
|
if ( nl > 18) {
|
|
c = cngetc();
|
|
if (c != ' ')
|
|
return;
|
|
nl = 0;
|
|
}
|
|
nl++;
|
|
}
|
|
}
|
|
}
|
|
#endif /* DDB */
|