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92252381f3
freebsd/sys/vm/vm_page.c
John Dyson 2d8acc0f4a VM level code cleanups. 
1)	Start using TSM.
	Struct procs continue to point to upages structure, after being freed.
	Struct vmspace continues to point to pte object and kva space for kstack.
	u_map is now superfluous.
2)	vm_map's don't need to be reference counted.  They always exist either
	in the kernel or in a vmspace.  The vmspaces are managed by reference
	counts.
3)	Remove the "wired" vm_map nonsense.
4)	No need to keep a cache of kernel stack kva's.
5)	Get rid of strange looking ++var, and change to var++.
6)	Change more data structures to use our "zone" allocator.  Added
	struct proc, struct vmspace and struct vnode.  This saves a significant
	amount of kva space and physical memory.  Additionally, this enables
	TSM for the zone managed memory.
7)	Keep ioopt disabled for now.
8)	Remove the now bogus "single use" map concept.
9)	Use generation counts or id's for data structures residing in TSM, where
	it allows us to avoid unneeded restart overhead during traversals, where
	blocking might occur.
10)	Account better for memory deficits, so the pageout daemon will be able
	to make enough memory available (experimental.)
11)	Fix some vnode locking problems. (From Tor, I think.)
12)	Add a check in ufs_lookup, to avoid lots of unneeded calls to bcmp.
	(experimental.)
13)	Significantly shrink, cleanup, and make slightly faster the vm_fault.c
	code.  Use generation counts, get rid of unneded collpase operations,
	and clean up the cluster code.
14)	Make vm_zone more suitable for TSM.

This commit is partially as a result of discussions and contributions from
other people, including DG, Tor Egge, PHK, and probably others that I
have forgotten to attribute (so let me know, if I forgot.)

This is not the infamous, final cleanup of the vnode stuff, but a necessary
step.  Vnode mgmt should be correct, but things might still change, and
there is still some missing stuff (like ioopt, and physical backing of
non-merged cache files, debugging of layering concepts.)
1998-01-22 17:30:44 +00:00

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/*
* Copyright (c) 1991 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.
*
* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
* $Id: vm_page.c,v 1.86 1998/01/17 09:16:59 dyson Exp $
*/
/*
* 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.
*/
/*
* Resident memory management module.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_prot.h>
#include <sys/lock.h>
#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_extern.h>
static void vm_page_queue_init __P((void));
static vm_page_t vm_page_select_free __P((vm_object_t object,
vm_pindex_t pindex, int prefqueue));
/*
* Associated with page of user-allocatable memory is a
* page structure.
*/
static int vm_page_bucket_generation; /* generation id for buckets */
static struct pglist *vm_page_buckets; /* Array of buckets */
static int vm_page_bucket_count; /* How big is array? */
static int vm_page_hash_mask; /* Mask for hash function */
struct pglist vm_page_queue_free[PQ_L2_SIZE] = {0};
struct pglist vm_page_queue_zero[PQ_L2_SIZE] = {0};
struct pglist vm_page_queue_active = {0};
struct pglist vm_page_queue_inactive = {0};
struct pglist vm_page_queue_cache[PQ_L2_SIZE] = {0};
int no_queue=0;
struct vpgqueues vm_page_queues[PQ_COUNT] = {0};
int pqcnt[PQ_COUNT] = {0};
static void
vm_page_queue_init(void) {
int i;
vm_page_queues[PQ_NONE].pl = NULL;
vm_page_queues[PQ_NONE].cnt = &no_queue;
for(i=0;i<PQ_L2_SIZE;i++) {
vm_page_queues[PQ_FREE+i].pl = &vm_page_queue_free[i];
vm_page_queues[PQ_FREE+i].cnt = &cnt.v_free_count;
}
for(i=0;i<PQ_L2_SIZE;i++) {
vm_page_queues[PQ_ZERO+i].pl = &vm_page_queue_zero[i];
vm_page_queues[PQ_ZERO+i].cnt = &cnt.v_free_count;
}
vm_page_queues[PQ_INACTIVE].pl = &vm_page_queue_inactive;
vm_page_queues[PQ_INACTIVE].cnt = &cnt.v_inactive_count;
vm_page_queues[PQ_ACTIVE].pl = &vm_page_queue_active;
vm_page_queues[PQ_ACTIVE].cnt = &cnt.v_active_count;
for(i=0;i<PQ_L2_SIZE;i++) {
vm_page_queues[PQ_CACHE+i].pl = &vm_page_queue_cache[i];
vm_page_queues[PQ_CACHE+i].cnt = &cnt.v_cache_count;
}
for(i=0;i<PQ_COUNT;i++) {
if (vm_page_queues[i].pl) {
TAILQ_INIT(vm_page_queues[i].pl);
} else if (i != 0) {
panic("vm_page_queue_init: queue %d is null", i);
}
vm_page_queues[i].lcnt = &pqcnt[i];
}
}
vm_page_t vm_page_array = 0;
int vm_page_array_size = 0;
long first_page = 0;
static long last_page;
static vm_size_t page_mask;
static int page_shift;
int vm_page_zero_count = 0;
/*
* map of contiguous valid DEV_BSIZE chunks in a page
* (this list is valid for page sizes upto 16*DEV_BSIZE)
*/
static u_short vm_page_dev_bsize_chunks[] = {
0x0, 0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff,
0x1ff, 0x3ff, 0x7ff, 0xfff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};
static inline int vm_page_hash __P((vm_object_t object, vm_pindex_t pindex));
static int vm_page_freechk_and_unqueue __P((vm_page_t m));
static void vm_page_free_wakeup __P((void));
/*
* vm_set_page_size:
*
* Sets the page size, perhaps based upon the memory
* size. Must be called before any use of page-size
* dependent functions.
*
* Sets page_shift and page_mask from cnt.v_page_size.
*/
void
vm_set_page_size()
{
if (cnt.v_page_size == 0)
cnt.v_page_size = DEFAULT_PAGE_SIZE;
page_mask = cnt.v_page_size - 1;
if ((page_mask & cnt.v_page_size) != 0)
panic("vm_set_page_size: page size not a power of two");
for (page_shift = 0;; page_shift++)
if ((1 << page_shift) == cnt.v_page_size)
break;
}
/*
* vm_page_startup:
*
* Initializes the resident memory module.
*
* Allocates memory for the page cells, and
* for the object/offset-to-page hash table headers.
* Each page cell is initialized and placed on the free list.
*/
vm_offset_t
vm_page_startup(starta, enda, vaddr)
register vm_offset_t starta;
vm_offset_t enda;
register vm_offset_t vaddr;
{
register vm_offset_t mapped;
register vm_page_t m;
register struct pglist *bucket;
vm_size_t npages, page_range;
register vm_offset_t new_start;
int i;
vm_offset_t pa;
int nblocks;
vm_offset_t first_managed_page;
/* the biggest memory array is the second group of pages */
vm_offset_t start;
vm_offset_t biggestone, biggestsize;
vm_offset_t total;
total = 0;
biggestsize = 0;
biggestone = 0;
nblocks = 0;
vaddr = round_page(vaddr);
for (i = 0; phys_avail[i + 1]; i += 2) {
phys_avail[i] = round_page(phys_avail[i]);
phys_avail[i + 1] = trunc_page(phys_avail[i + 1]);
}
for (i = 0; phys_avail[i + 1]; i += 2) {
int size = phys_avail[i + 1] - phys_avail[i];
if (size > biggestsize) {
biggestone = i;
biggestsize = size;
}
++nblocks;
total += size;
}
start = phys_avail[biggestone];
/*
* Initialize the queue headers for the free queue, the active queue
* and the inactive queue.
*/
vm_page_queue_init();
/*
* Allocate (and initialize) the hash table buckets.
*
* The number of buckets MUST BE a power of 2, and the actual value is
* the next power of 2 greater than the number of physical pages in
* the system.
*
* Note: This computation can be tweaked if desired.
*/
vm_page_buckets = (struct pglist *) vaddr;
bucket = vm_page_buckets;
if (vm_page_bucket_count == 0) {
vm_page_bucket_count = 1;
while (vm_page_bucket_count < atop(total))
vm_page_bucket_count <<= 1;
}
vm_page_hash_mask = vm_page_bucket_count - 1;
/*
* Validate these addresses.
*/
new_start = start + vm_page_bucket_count * sizeof(struct pglist);
new_start = round_page(new_start);
mapped = vaddr;
vaddr = pmap_map(mapped, start, new_start,
VM_PROT_READ | VM_PROT_WRITE);
start = new_start;
bzero((caddr_t) mapped, vaddr - mapped);
mapped = vaddr;
for (i = 0; i < vm_page_bucket_count; i++) {
TAILQ_INIT(bucket);
bucket++;
}
/*
* Validate these zone addresses.
*/
new_start = start + (vaddr - mapped);
pmap_map(mapped, start, new_start, VM_PROT_READ | VM_PROT_WRITE);
bzero((caddr_t) mapped, (vaddr - mapped));
start = round_page(new_start);
/*
* Compute the number of pages of memory that will be available for
* use (taking into account the overhead of a page structure per
* page).
*/
first_page = phys_avail[0] / PAGE_SIZE;
last_page = phys_avail[(nblocks - 1) * 2 + 1] / PAGE_SIZE;
page_range = last_page - (phys_avail[0] / PAGE_SIZE);
npages = (total - (page_range * sizeof(struct vm_page)) -
(start - phys_avail[biggestone])) / PAGE_SIZE;
/*
* Initialize the mem entry structures now, and put them in the free
* queue.
*/
vm_page_array = (vm_page_t) vaddr;
mapped = vaddr;
/*
* Validate these addresses.
*/
new_start = round_page(start + page_range * sizeof(struct vm_page));
mapped = pmap_map(mapped, start, new_start,
VM_PROT_READ | VM_PROT_WRITE);
start = new_start;
first_managed_page = start / PAGE_SIZE;
/*
* Clear all of the page structures
*/
bzero((caddr_t) vm_page_array, page_range * sizeof(struct vm_page));
vm_page_array_size = page_range;
cnt.v_page_count = 0;
cnt.v_free_count = 0;
for (i = 0; phys_avail[i + 1] && npages > 0; i += 2) {
if (i == biggestone)
pa = ptoa(first_managed_page);
else
pa = phys_avail[i];
while (pa < phys_avail[i + 1] && npages-- > 0) {
++cnt.v_page_count;
++cnt.v_free_count;
m = PHYS_TO_VM_PAGE(pa);
m->phys_addr = pa;
m->flags = 0;
m->pc = (pa >> PAGE_SHIFT) & PQ_L2_MASK;
m->queue = PQ_FREE + m->pc;
TAILQ_INSERT_TAIL(vm_page_queues[m->queue].pl, m, pageq);
++(*vm_page_queues[m->queue].lcnt);
pa += PAGE_SIZE;
}
}
return (mapped);
}
/*
* vm_page_hash:
*
* Distributes the object/offset key pair among hash buckets.
*
* NOTE: This macro depends on vm_page_bucket_count being a power of 2.
*/
static inline int
vm_page_hash(object, pindex)
vm_object_t object;
vm_pindex_t pindex;
{
return ((((unsigned) object) >> 5) + (pindex >> 1)) & vm_page_hash_mask;
}
/*
* vm_page_insert: [ internal use only ]
*
* Inserts the given mem entry into the object/object-page
* table and object list.
*
* The object and page must be locked, and must be splhigh.
*/
void
vm_page_insert(m, object, pindex)
register vm_page_t m;
register vm_object_t object;
register vm_pindex_t pindex;
{
register struct pglist *bucket;
if (m->flags & PG_TABLED)
panic("vm_page_insert: already inserted");
/*
* Record the object/offset pair in this page
*/
m->object = object;
m->pindex = pindex;
/*
* Insert it into the object_object/offset hash table
*/
bucket = &vm_page_buckets[vm_page_hash(object, pindex)];
TAILQ_INSERT_TAIL(bucket, m, hashq);
vm_page_bucket_generation++;
/*
* Now link into the object's list of backed pages.
*/
TAILQ_INSERT_TAIL(&object->memq, m, listq);
m->flags |= PG_TABLED;
m->object->page_hint = m;
m->object->generation++;
/*
* And show that the object has one more resident page.
*/
object->resident_page_count++;
}
/*
* vm_page_remove: [ internal use only ]
* NOTE: used by device pager as well -wfj
*
* Removes the given mem entry from the object/offset-page
* table and the object page list.
*
* The object and page must be locked, and at splhigh.
*/
void
vm_page_remove(m)
register vm_page_t m;
{
register struct pglist *bucket;
if (!(m->flags & PG_TABLED))
return;
if (m->object->page_hint == m)
m->object->page_hint = NULL;
/*
* Remove from the object_object/offset hash table
*/
bucket = &vm_page_buckets[vm_page_hash(m->object, m->pindex)];
TAILQ_REMOVE(bucket, m, hashq);
vm_page_bucket_generation++;
/*
* Now remove from the object's list of backed pages.
*/
TAILQ_REMOVE(&m->object->memq, m, listq);
/*
* And show that the object has one fewer resident page.
*/
m->object->resident_page_count--;
m->object->generation++;
m->flags &= ~PG_TABLED;
}
/*
* vm_page_lookup:
*
* Returns the page associated with the object/offset
* pair specified; if none is found, NULL is returned.
*
* The object must be locked. No side effects.
*/
vm_page_t
vm_page_lookup(object, pindex)
register vm_object_t object;
register vm_pindex_t pindex;
{
register vm_page_t m;
register struct pglist *bucket;
int curgeneration;
int s;
/*
* Search the hash table for this object/offset pair
*/
bucket = &vm_page_buckets[vm_page_hash(object, pindex)];
restart:
curgeneration = vm_page_bucket_generation;
for (m = TAILQ_FIRST(bucket); m != NULL; m = TAILQ_NEXT(m,hashq)) {
if (curgeneration != vm_page_bucket_generation)
goto restart;
if ((m->object == object) && (m->pindex == pindex)) {
m->object->page_hint = m;
return (m);
}
}
return (NULL);
}
/*
* vm_page_rename:
*
* Move the given memory entry from its
* current object to the specified target object/offset.
*
* The object must be locked.
*/
void
vm_page_rename(m, new_object, new_pindex)
register vm_page_t m;
register vm_object_t new_object;
vm_pindex_t new_pindex;
{
int s;
s = splvm();
vm_page_remove(m);
vm_page_insert(m, new_object, new_pindex);
splx(s);
}
/*
* vm_page_unqueue without any wakeup
*/
void
vm_page_unqueue_nowakeup(m)
vm_page_t m;
{
int queue = m->queue;
struct vpgqueues *pq;
if (queue != PQ_NONE) {
pq = &vm_page_queues[queue];
m->queue = PQ_NONE;
TAILQ_REMOVE(pq->pl, m, pageq);
--(*pq->cnt);
--(*pq->lcnt);
}
}
/*
* vm_page_unqueue must be called at splhigh();
*/
void
vm_page_unqueue(m)
vm_page_t m;
{
int queue = m->queue;
struct vpgqueues *pq;
if (queue != PQ_NONE) {
m->queue = PQ_NONE;
pq = &vm_page_queues[queue];
TAILQ_REMOVE(pq->pl, m, pageq);
--(*pq->cnt);
--(*pq->lcnt);
if ((queue - m->pc) == PQ_CACHE) {
if ((cnt.v_cache_count + cnt.v_free_count) <
(cnt.v_free_reserved + cnt.v_cache_min))
pagedaemon_wakeup();
}
}
}
/*
* Find a page on the specified queue with color optimization.
*/
vm_page_t
vm_page_list_find(basequeue, index)
int basequeue, index;
{
#if PQ_L2_SIZE > 1
int i,j;
vm_page_t m;
int hindex;
struct vpgqueues *pq;
pq = &vm_page_queues[basequeue];
m = TAILQ_FIRST(pq[index].pl);
if (m)
return m;
for(j = 0; j < PQ_L1_SIZE; j++) {
int ij;
for(i = (PQ_L2_SIZE / 2) - PQ_L1_SIZE;
(ij = i + j) > 0;
i -= PQ_L1_SIZE) {
hindex = index + ij;
if (hindex >= PQ_L2_SIZE)
hindex -= PQ_L2_SIZE;
if (m = TAILQ_FIRST(pq[hindex].pl))
return m;
hindex = index - ij;
if (hindex < 0)
hindex += PQ_L2_SIZE;
if (m = TAILQ_FIRST(pq[hindex].pl))
return m;
}
}
hindex = index + PQ_L2_SIZE / 2;
if (hindex >= PQ_L2_SIZE)
hindex -= PQ_L2_SIZE;
m = TAILQ_FIRST(pq[hindex].pl);
if (m)
return m;
return NULL;
#else
return TAILQ_FIRST(vm_page_queues[basequeue].pl);
#endif
}
/*
* Find a page on the specified queue with color optimization.
*/
vm_page_t
vm_page_select(object, pindex, basequeue)
vm_object_t object;
vm_pindex_t pindex;
int basequeue;
{
#if PQ_L2_SIZE > 1
int index;
index = (pindex + object->pg_color) & PQ_L2_MASK;
return vm_page_list_find(basequeue, index);
#else
return TAILQ_FIRST(vm_page_queues[basequeue].pl);
#endif
}
/*
* Find a free or zero page, with specified preference.
*/
static vm_page_t
vm_page_select_free(object, pindex, prefqueue)
vm_object_t object;
vm_pindex_t pindex;
int prefqueue;
{
#if PQ_L2_SIZE > 1
int i,j;
int index, hindex;
#endif
vm_page_t m, mh;
int oqueuediff;
struct vpgqueues *pq;
if (prefqueue == PQ_ZERO)
oqueuediff = PQ_FREE - PQ_ZERO;
else
oqueuediff = PQ_ZERO - PQ_FREE;
if (mh = object->page_hint) {
if (mh->pindex == (pindex - 1)) {
if ((mh->flags & PG_FICTITIOUS) == 0) {
if ((mh < &vm_page_array[cnt.v_page_count-1]) &&
(mh >= &vm_page_array[0])) {
int queue;
m = mh + 1;
if (VM_PAGE_TO_PHYS(m) == (VM_PAGE_TO_PHYS(mh) + PAGE_SIZE)) {
queue = m->queue - m->pc;
if (queue == PQ_FREE || queue == PQ_ZERO) {
return m;
}
}
}
}
}
}
pq = &vm_page_queues[prefqueue];
#if PQ_L2_SIZE > 1
index = (pindex + object->pg_color) & PQ_L2_MASK;
if (m = TAILQ_FIRST(pq[index].pl))
return m;
if (m = TAILQ_FIRST(pq[index + oqueuediff].pl))
return m;
for(j = 0; j < PQ_L1_SIZE; j++) {
int ij;
for(i = (PQ_L2_SIZE / 2) - PQ_L1_SIZE;
(ij = i + j) >= 0;
i -= PQ_L1_SIZE) {
hindex = index + ij;
if (hindex >= PQ_L2_SIZE)
hindex -= PQ_L2_SIZE;
if (m = TAILQ_FIRST(pq[hindex].pl))
return m;
if (m = TAILQ_FIRST(pq[hindex + oqueuediff].pl))
return m;
hindex = index - ij;
if (hindex < 0)
hindex += PQ_L2_SIZE;
if (m = TAILQ_FIRST(pq[hindex].pl))
return m;
if (m = TAILQ_FIRST(pq[hindex + oqueuediff].pl))
return m;
}
}
hindex = index + PQ_L2_SIZE / 2;
if (hindex >= PQ_L2_SIZE)
hindex -= PQ_L2_SIZE;
if (m = TAILQ_FIRST(pq[hindex].pl))
return m;
if (m = TAILQ_FIRST(pq[hindex+oqueuediff].pl))
return m;
#else
if (m = TAILQ_FIRST(pq[0].pl))
return m;
else
return TAILQ_FIRST(pq[oqueuediff].pl);
#endif
return NULL;
}
/*
* vm_page_alloc:
*
* Allocate and return a memory cell associated
* with this VM object/offset pair.
*
* page_req classes:
* VM_ALLOC_NORMAL normal process request
* VM_ALLOC_SYSTEM system *really* needs a page
* VM_ALLOC_INTERRUPT interrupt time request
* VM_ALLOC_ZERO zero page
*
* Object must be locked.
*/
vm_page_t
vm_page_alloc(object, pindex, page_req)
vm_object_t object;
vm_pindex_t pindex;
int page_req;
{
register vm_page_t m;
struct vpgqueues *pq;
vm_object_t oldobject;
int queue, qtype;
int s;
#ifdef DIAGNOSTIC
m = vm_page_lookup(object, pindex);
if (m)
panic("vm_page_alloc: page already allocated");
#endif
if ((curproc == pageproc) && (page_req != VM_ALLOC_INTERRUPT)) {
page_req = VM_ALLOC_SYSTEM;
};
s = splvm();
switch (page_req) {
case VM_ALLOC_NORMAL:
if (cnt.v_free_count >= cnt.v_free_reserved) {
m = vm_page_select_free(object, pindex, PQ_FREE);
#if defined(DIAGNOSTIC)
if (m == NULL)
panic("vm_page_alloc(NORMAL): missing page on free queue\n");
#endif
} else {
m = vm_page_select(object, pindex, PQ_CACHE);
if (m == NULL) {
splx(s);
#if defined(DIAGNOSTIC)
if (cnt.v_cache_count > 0)
printf("vm_page_alloc(NORMAL): missing pages on cache queue: %d\n", cnt.v_cache_count);
#endif
vm_pageout_deficit++;
pagedaemon_wakeup();
return (NULL);
}
}
break;
case VM_ALLOC_ZERO:
if (cnt.v_free_count >= cnt.v_free_reserved) {
m = vm_page_select_free(object, pindex, PQ_ZERO);
#if defined(DIAGNOSTIC)
if (m == NULL)
panic("vm_page_alloc(ZERO): missing page on free queue\n");
#endif
} else {
m = vm_page_select(object, pindex, PQ_CACHE);
if (m == NULL) {
splx(s);
#if defined(DIAGNOSTIC)
if (cnt.v_cache_count > 0)
printf("vm_page_alloc(ZERO): missing pages on cache queue: %d\n", cnt.v_cache_count);
#endif
vm_pageout_deficit++;
pagedaemon_wakeup();
return (NULL);
}
}
break;
case VM_ALLOC_SYSTEM:
if ((cnt.v_free_count >= cnt.v_free_reserved) ||
((cnt.v_cache_count == 0) &&
(cnt.v_free_count >= cnt.v_interrupt_free_min))) {
m = vm_page_select_free(object, pindex, PQ_FREE);
#if defined(DIAGNOSTIC)
if (m == NULL)
panic("vm_page_alloc(SYSTEM): missing page on free queue\n");
#endif
} else {
m = vm_page_select(object, pindex, PQ_CACHE);
if (m == NULL) {
splx(s);
#if defined(DIAGNOSTIC)
if (cnt.v_cache_count > 0)
printf("vm_page_alloc(SYSTEM): missing pages on cache queue: %d\n", cnt.v_cache_count);
#endif
vm_pageout_deficit++;
pagedaemon_wakeup();
return (NULL);
}
}
break;
case VM_ALLOC_INTERRUPT:
if (cnt.v_free_count > 0) {
m = vm_page_select_free(object, pindex, PQ_FREE);
#if defined(DIAGNOSTIC)
if (m == NULL)
panic("vm_page_alloc(INTERRUPT): missing page on free queue\n");
#endif
} else {
splx(s);
vm_pageout_deficit++;
pagedaemon_wakeup();
return (NULL);
}
break;
default:
panic("vm_page_alloc: invalid allocation class");
}
queue = m->queue;
qtype = queue - m->pc;
if (qtype == PQ_ZERO)
--vm_page_zero_count;
pq = &vm_page_queues[queue];
TAILQ_REMOVE(pq->pl, m, pageq);
--(*pq->cnt);
--(*pq->lcnt);
oldobject = NULL;
if (qtype == PQ_ZERO) {
m->flags = PG_ZERO|PG_BUSY;
} else if (qtype == PQ_CACHE) {
oldobject = m->object;
vm_page_remove(m);
m->flags = PG_BUSY;
} else {
m->flags = PG_BUSY;
}
m->wire_count = 0;
m->hold_count = 0;
m->act_count = 0;
m->busy = 0;
m->valid = 0;
m->dirty = 0;
m->queue = PQ_NONE;
/* XXX before splx until vm_page_insert is safe */
vm_page_insert(m, object, pindex);
/*
* Don't wakeup too often - wakeup the pageout daemon when
* we would be nearly out of memory.
*/
if (((cnt.v_free_count + cnt.v_cache_count) <
(cnt.v_free_reserved + cnt.v_cache_min)) ||
(cnt.v_free_count < cnt.v_pageout_free_min))
pagedaemon_wakeup();
if ((qtype == PQ_CACHE) &&
((page_req == VM_ALLOC_NORMAL) || (page_req == VM_ALLOC_ZERO)) &&
oldobject && (oldobject->type == OBJT_VNODE) &&
((oldobject->flags & OBJ_DEAD) == 0)) {
struct vnode *vp;
vp = (struct vnode *) oldobject->handle;
if (vp && VSHOULDFREE(vp)) {
if ((vp->v_flag & (VFREE|VTBFREE|VDOOMED)) == 0) {
TAILQ_INSERT_TAIL(&vnode_tobefree_list, vp, v_freelist);
vp->v_flag |= VTBFREE;
}
}
}
splx(s);
return (m);
}
void
vm_wait()
{
int s;
s = splvm();
if (curproc == pageproc) {
vm_pageout_pages_needed = 1;
tsleep(&vm_pageout_pages_needed, PSWP, "vmwait", 0);
} else {
if (!vm_pages_needed) {
vm_pages_needed++;
wakeup(&vm_pages_needed);
}
tsleep(&cnt.v_free_count, PVM, "vmwait", 0);
}
splx(s);
}
/*
* vm_page_activate:
*
* Put the specified page on the active list (if appropriate).
*
* The page queues must be locked.
*/
void
vm_page_activate(m)
register vm_page_t m;
{
int s;
s = splvm();
if (m->queue == PQ_ACTIVE)
panic("vm_page_activate: already active");
if ((m->queue - m->pc) == PQ_CACHE)
cnt.v_reactivated++;
vm_page_unqueue(m);
if (m->wire_count == 0) {
m->queue = PQ_ACTIVE;
++(*vm_page_queues[PQ_ACTIVE].lcnt);
TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
if (m->act_count < ACT_INIT)
m->act_count = ACT_INIT;
cnt.v_active_count++;
}
splx(s);
}
/*
* helper routine for vm_page_free and vm_page_free_zero
*/
static int
vm_page_freechk_and_unqueue(m)
vm_page_t m;
{
vm_object_t oldobject;
oldobject = m->object;
#if !defined(MAX_PERF)
if (m->busy ||
(m->flags & PG_BUSY) ||
((m->queue - m->pc) == PQ_FREE) ||
(m->hold_count != 0)) {
printf("vm_page_free: pindex(%ld), busy(%d), PG_BUSY(%d), hold(%d)\n",
m->pindex, m->busy,
(m->flags & PG_BUSY) ? 1 : 0, m->hold_count);
if ((m->queue - m->pc) == PQ_FREE)
panic("vm_page_free: freeing free page");
else
panic("vm_page_free: freeing busy page");
}
#endif
vm_page_remove(m);
vm_page_unqueue_nowakeup(m);
if ((m->flags & PG_FICTITIOUS) != 0) {
return 0;
}
if (m->wire_count != 0) {
if (m->wire_count > 1) {
panic("vm_page_free: invalid wire count (%d), pindex: 0x%x",
m->wire_count, m->pindex);
}
m->wire_count = 0;
cnt.v_wire_count--;
}
if (oldobject && (oldobject->type == OBJT_VNODE) &&
((oldobject->flags & OBJ_DEAD) == 0)) {
struct vnode *vp;
vp = (struct vnode *) oldobject->handle;
if (vp && VSHOULDFREE(vp)) {
if ((vp->v_flag & (VTBFREE|VDOOMED|VFREE)) == 0) {
TAILQ_INSERT_TAIL(&vnode_tobefree_list, vp, v_freelist);
vp->v_flag |= VTBFREE;
}
}
}
return 1;
}
/*
* helper routine for vm_page_free and vm_page_free_zero
*/
static __inline void
vm_page_free_wakeup()
{
/*
* if pageout daemon needs pages, then tell it that there are
* some free.
*/
if (vm_pageout_pages_needed) {
wakeup(&vm_pageout_pages_needed);
vm_pageout_pages_needed = 0;
}
/*
* wakeup processes that are waiting on memory if we hit a
* high water mark. And wakeup scheduler process if we have
* lots of memory. this process will swapin processes.
*/
if (vm_pages_needed &&
((cnt.v_free_count + cnt.v_cache_count) >= cnt.v_free_min)) {
wakeup(&cnt.v_free_count);
vm_pages_needed = 0;
}
}
/*
* vm_page_free:
*
* Returns the given page to the free list,
* disassociating it with any VM object.
*
* Object and page must be locked prior to entry.
*/
void
vm_page_free(m)
register vm_page_t m;
{
int s;
struct vpgqueues *pq;
s = splvm();
cnt.v_tfree++;
if (!vm_page_freechk_and_unqueue(m)) {
splx(s);
return;
}
m->queue = PQ_FREE + m->pc;
pq = &vm_page_queues[m->queue];
++(*pq->lcnt);
++(*pq->cnt);
/*
* If the pageout process is grabbing the page, it is likely
* that the page is NOT in the cache. It is more likely that
* the page will be partially in the cache if it is being
* explicitly freed.
*/
if (curproc == pageproc) {
TAILQ_INSERT_TAIL(pq->pl, m, pageq);
} else {
TAILQ_INSERT_HEAD(pq->pl, m, pageq);
}
vm_page_free_wakeup();
splx(s);
}
void
vm_page_free_zero(m)
register vm_page_t m;
{
int s;
struct vpgqueues *pq;
s = splvm();
cnt.v_tfree++;
if (!vm_page_freechk_and_unqueue(m)) {
splx(s);
return;
}
m->queue = PQ_ZERO + m->pc;
pq = &vm_page_queues[m->queue];
++(*pq->lcnt);
++(*pq->cnt);
TAILQ_INSERT_HEAD(pq->pl, m, pageq);
++vm_page_zero_count;
vm_page_free_wakeup();
splx(s);
}
/*
* vm_page_wire:
*
* Mark this page as wired down by yet
* another map, removing it from paging queues
* as necessary.
*
* The page queues must be locked.
*/
void
vm_page_wire(m)
register vm_page_t m;
{
int s;
if (m->wire_count == 0) {
s = splvm();
vm_page_unqueue(m);
splx(s);
cnt.v_wire_count++;
}
++(*vm_page_queues[PQ_NONE].lcnt);
m->wire_count++;
m->flags |= PG_MAPPED;
}
/*
* vm_page_unwire:
*
* Release one wiring of this page, potentially
* enabling it to be paged again.
*
* The page queues must be locked.
*/
void
vm_page_unwire(m)
register vm_page_t m;
{
int s;
s = splvm();
if (m->wire_count > 0)
m->wire_count--;
if (m->wire_count == 0) {
cnt.v_wire_count--;
TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
m->queue = PQ_ACTIVE;
++(*vm_page_queues[PQ_ACTIVE].lcnt);
cnt.v_active_count++;
}
splx(s);
}
/*
* vm_page_deactivate:
*
* Returns the given page to the inactive list,
* indicating that no physical maps have access
* to this page. [Used by the physical mapping system.]
*
* The page queues must be locked.
*/
void
vm_page_deactivate(m)
register vm_page_t m;
{
int s;
/*
* Only move active pages -- ignore locked or already inactive ones.
*
* XXX: sometimes we get pages which aren't wired down or on any queue -
* we need to put them on the inactive queue also, otherwise we lose
* track of them. Paul Mackerras (paulus@cs.anu.edu.au) 9-Jan-93.
*/
if (m->queue == PQ_INACTIVE)
return;
s = splvm();
if (m->wire_count == 0 && m->hold_count == 0) {
if ((m->queue - m->pc) == PQ_CACHE)
cnt.v_reactivated++;
vm_page_unqueue(m);
TAILQ_INSERT_TAIL(&vm_page_queue_inactive, m, pageq);
m->queue = PQ_INACTIVE;
++(*vm_page_queues[PQ_INACTIVE].lcnt);
cnt.v_inactive_count++;
}
splx(s);
}
/*
* vm_page_cache
*
* Put the specified page onto the page cache queue (if appropriate).
*/
void
vm_page_cache(m)
register vm_page_t m;
{
int s;
if ((m->flags & PG_BUSY) || m->busy || m->wire_count) {
printf("vm_page_cache: attempting to cache busy page\n");
return;
}
if ((m->queue - m->pc) == PQ_CACHE)
return;
vm_page_protect(m, VM_PROT_NONE);
if (m->dirty != 0) {
panic("vm_page_cache: caching a dirty page, pindex: %d", m->pindex);
}
s = splvm();
vm_page_unqueue_nowakeup(m);
m->queue = PQ_CACHE + m->pc;
++(*vm_page_queues[m->queue].lcnt);
TAILQ_INSERT_TAIL(vm_page_queues[m->queue].pl, m, pageq);
cnt.v_cache_count++;
vm_page_free_wakeup();
splx(s);
}
/*
* mapping function for valid bits or for dirty bits in
* a page
*/
inline int
vm_page_bits(int base, int size)
{
u_short chunk;
if ((base == 0) && (size >= PAGE_SIZE))
return VM_PAGE_BITS_ALL;
size = (size + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1);
base = (base % PAGE_SIZE) / DEV_BSIZE;
chunk = vm_page_dev_bsize_chunks[size / DEV_BSIZE];
return (chunk << base) & VM_PAGE_BITS_ALL;
}
/*
* set a page valid and clean
*/
void
vm_page_set_validclean(m, base, size)
vm_page_t m;
int base;
int size;
{
int pagebits = vm_page_bits(base, size);
m->valid |= pagebits;
m->dirty &= ~pagebits;
if( base == 0 && size == PAGE_SIZE)
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
}
/*
* set a page (partially) invalid
*/
void
vm_page_set_invalid(m, base, size)
vm_page_t m;
int base;
int size;
{
int bits;
m->valid &= ~(bits = vm_page_bits(base, size));
if (m->valid == 0)
m->dirty &= ~bits;
}
/*
* is (partial) page valid?
*/
int
vm_page_is_valid(m, base, size)
vm_page_t m;
int base;
int size;
{
int bits = vm_page_bits(base, size);
if (m->valid && ((m->valid & bits) == bits))
return 1;
else
return 0;
}
void
vm_page_test_dirty(m)
vm_page_t m;
{
if ((m->dirty != VM_PAGE_BITS_ALL) &&
pmap_is_modified(VM_PAGE_TO_PHYS(m))) {
m->dirty = VM_PAGE_BITS_ALL;
}
}
/*
* This interface is for merging with malloc() someday.
* Even if we never implement compaction so that contiguous allocation
* works after initialization time, malloc()'s data structures are good
* for statistics and for allocations of less than a page.
*/
void *
contigmalloc1(size, type, flags, low, high, alignment, boundary, map)
unsigned long size; /* should be size_t here and for malloc() */
struct malloc_type *type;
int flags;
unsigned long low;
unsigned long high;
unsigned long alignment;
unsigned long boundary;
vm_map_t map;
{
int i, s, start;
vm_offset_t addr, phys, tmp_addr;
int pass;
vm_page_t pga = vm_page_array;
size = round_page(size);
if (size == 0)
panic("contigmalloc1: size must not be 0");
if ((alignment & (alignment - 1)) != 0)
panic("contigmalloc1: alignment must be a power of 2");
if ((boundary & (boundary - 1)) != 0)
panic("contigmalloc1: boundary must be a power of 2");
start = 0;
for (pass = 0; pass <= 1; pass++) {
s = splvm();
again:
/*
* Find first page in array that is free, within range, aligned, and
* such that the boundary won't be crossed.
*/
for (i = start; i < cnt.v_page_count; i++) {
int pqtype;
phys = VM_PAGE_TO_PHYS(&pga[i]);
pqtype = pga[i].queue - pga[i].pc;
if (((pqtype == PQ_ZERO) || (pqtype == PQ_FREE) || (pqtype == PQ_CACHE)) &&
(phys >= low) && (phys < high) &&
((phys & (alignment - 1)) == 0) &&
(((phys ^ (phys + size - 1)) & ~(boundary - 1)) == 0))
break;
}
/*
* If the above failed or we will exceed the upper bound, fail.
*/
if ((i == cnt.v_page_count) ||
((VM_PAGE_TO_PHYS(&pga[i]) + size) > high)) {
vm_page_t m, next;
again1:
for (m = TAILQ_FIRST(&vm_page_queue_inactive);
m != NULL;
m = next) {
if (m->queue != PQ_INACTIVE) {
break;
}
next = TAILQ_NEXT(m, pageq);
if (m->flags & PG_BUSY) {
m->flags |= PG_WANTED;
tsleep(m, PVM, "vpctw0", 0);
goto again1;
}
vm_page_test_dirty(m);
if (m->dirty) {
if (m->object->type == OBJT_VNODE) {
vn_lock(m->object->handle, LK_EXCLUSIVE | LK_RETRY, curproc);
vm_object_page_clean(m->object, 0, 0, TRUE);
VOP_UNLOCK(m->object->handle, 0, curproc);
goto again1;
} else if (m->object->type == OBJT_SWAP ||
m->object->type == OBJT_DEFAULT) {
vm_page_protect(m, VM_PROT_NONE);
vm_pageout_flush(&m, 1, 0);
goto again1;
}
}
if ((m->dirty == 0) &&
(m->busy == 0) &&
(m->hold_count == 0))
vm_page_cache(m);
}
for (m = TAILQ_FIRST(&vm_page_queue_active);
m != NULL;
m = next) {
if (m->queue != PQ_ACTIVE) {
break;
}
next = TAILQ_NEXT(m, pageq);
if (m->flags & PG_BUSY) {
m->flags |= PG_WANTED;
tsleep(m, PVM, "vpctw1", 0);
goto again1;
}
vm_page_test_dirty(m);
if (m->dirty) {
if (m->object->type == OBJT_VNODE) {
vn_lock(m->object->handle, LK_EXCLUSIVE | LK_RETRY, curproc);
vm_object_page_clean(m->object, 0, 0, TRUE);
VOP_UNLOCK(m->object->handle, 0, curproc);
goto again1;
} else if (m->object->type == OBJT_SWAP ||
m->object->type == OBJT_DEFAULT) {
vm_page_protect(m, VM_PROT_NONE);
vm_pageout_flush(&m, 1, 0);
goto again1;
}
}
if ((m->dirty == 0) &&
(m->busy == 0) &&
(m->hold_count == 0))
vm_page_cache(m);
}
splx(s);
continue;
}
start = i;
/*
* Check successive pages for contiguous and free.
*/
for (i = start + 1; i < (start + size / PAGE_SIZE); i++) {
int pqtype;
pqtype = pga[i].queue - pga[i].pc;
if ((VM_PAGE_TO_PHYS(&pga[i]) !=
(VM_PAGE_TO_PHYS(&pga[i - 1]) + PAGE_SIZE)) ||
((pqtype != PQ_ZERO) && (pqtype != PQ_FREE) && (pqtype != PQ_CACHE))) {
start++;
goto again;
}
}
for (i = start; i < (start + size / PAGE_SIZE); i++) {
int pqtype;
vm_page_t m = &pga[i];
pqtype = m->queue - m->pc;
if (pqtype == PQ_CACHE)
vm_page_free(m);
TAILQ_REMOVE(vm_page_queues[m->queue].pl, m, pageq);
--(*vm_page_queues[m->queue].lcnt);
cnt.v_free_count--;
m->valid = VM_PAGE_BITS_ALL;
m->flags = 0;
m->dirty = 0;
m->wire_count = 0;
m->busy = 0;
m->queue = PQ_NONE;
m->object = NULL;
vm_page_wire(m);
}
/*
* We've found a contiguous chunk that meets are requirements.
* Allocate kernel VM, unfree and assign the physical pages to it and
* return kernel VM pointer.
*/
tmp_addr = addr = kmem_alloc_pageable(map, size);
if (addr == 0) {
/*
* XXX We almost never run out of kernel virtual
* space, so we don't make the allocated memory
* above available.
*/
splx(s);
return (NULL);
}
for (i = start; i < (start + size / PAGE_SIZE); i++) {
vm_page_t m = &pga[i];
vm_page_insert(m, kernel_object,
OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
pmap_kenter(tmp_addr, VM_PAGE_TO_PHYS(m));
tmp_addr += PAGE_SIZE;
}
splx(s);
return ((void *)addr);
}
return NULL;
}
void *
contigmalloc(size, type, flags, low, high, alignment, boundary)
unsigned long size; /* should be size_t here and for malloc() */
struct malloc_type *type;
int flags;
unsigned long low;
unsigned long high;
unsigned long alignment;
unsigned long boundary;
{
return contigmalloc1(size, type, flags, low, high, alignment, boundary,
kernel_map);
}
vm_offset_t
vm_page_alloc_contig(size, low, high, alignment)
vm_offset_t size;
vm_offset_t low;
vm_offset_t high;
vm_offset_t alignment;
{
return ((vm_offset_t)contigmalloc1(size, M_DEVBUF, M_NOWAIT, low, high,
alignment, 0ul, kernel_map));
}
#include "opt_ddb.h"
#ifdef DDB
#include <sys/kernel.h>
#include <ddb/ddb.h>
DB_SHOW_COMMAND(page, vm_page_print_page_info)
{
db_printf("cnt.v_free_count: %d\n", cnt.v_free_count);
db_printf("cnt.v_cache_count: %d\n", cnt.v_cache_count);
db_printf("cnt.v_inactive_count: %d\n", cnt.v_inactive_count);
db_printf("cnt.v_active_count: %d\n", cnt.v_active_count);
db_printf("cnt.v_wire_count: %d\n", cnt.v_wire_count);
db_printf("cnt.v_free_reserved: %d\n", cnt.v_free_reserved);
db_printf("cnt.v_free_min: %d\n", cnt.v_free_min);
db_printf("cnt.v_free_target: %d\n", cnt.v_free_target);
db_printf("cnt.v_cache_min: %d\n", cnt.v_cache_min);
db_printf("cnt.v_inactive_target: %d\n", cnt.v_inactive_target);
}
DB_SHOW_COMMAND(pageq, vm_page_print_pageq_info)
{
int i;
db_printf("PQ_FREE:");
for(i=0;i<PQ_L2_SIZE;i++) {
db_printf(" %d", *vm_page_queues[PQ_FREE + i].lcnt);
}
db_printf("\n");
db_printf("PQ_CACHE:");
for(i=0;i<PQ_L2_SIZE;i++) {
db_printf(" %d", *vm_page_queues[PQ_CACHE + i].lcnt);
}
db_printf("\n");
db_printf("PQ_ZERO:");
for(i=0;i<PQ_L2_SIZE;i++) {
db_printf(" %d", *vm_page_queues[PQ_ZERO + i].lcnt);
}
db_printf("\n");
db_printf("PQ_ACTIVE: %d, PQ_INACTIVE: %d\n",
*vm_page_queues[PQ_ACTIVE].lcnt,
*vm_page_queues[PQ_INACTIVE].lcnt);
}
#endif /* DDB */
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