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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sys/vm/vm_phys.c |
/*-
* Copyright (c) 2002-2006 Rice University
* Copyright (c) 2007 Alan L. Cox <alc@cs.rice.edu>
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Alan L. Cox,
* Olivier Crameri, Peter Druschel, Sitaram Iyer, and Juan Navarro.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDERS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/vm/vm_phys.c 236924 2012-06-11 21:19:59Z kib $");
#include "opt_ddb.h"
#include "opt_vm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
#include <ddb/ddb.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_phys.h>
#include <vm/vm_reserv.h>
/*
* VM_FREELIST_DEFAULT is split into VM_NDOMAIN lists, one for each
* domain. These extra lists are stored at the end of the regular
* free lists starting with VM_NFREELIST.
*/
#define VM_RAW_NFREELIST (VM_NFREELIST + VM_NDOMAIN - 1)
struct vm_freelist {
struct pglist pl;
int lcnt;
};
struct vm_phys_seg {
vm_paddr_t start;
vm_paddr_t end;
vm_page_t first_page;
int domain;
struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER];
};
struct mem_affinity *mem_affinity;
static struct vm_phys_seg vm_phys_segs[VM_PHYSSEG_MAX];
static int vm_phys_nsegs;
#define VM_PHYS_FICTITIOUS_NSEGS 8
static struct vm_phys_fictitious_seg {
vm_paddr_t start;
vm_paddr_t end;
vm_page_t first_page;
} vm_phys_fictitious_segs[VM_PHYS_FICTITIOUS_NSEGS];
static struct mtx vm_phys_fictitious_reg_mtx;
MALLOC_DEFINE(M_FICT_PAGES, "", "");
static struct vm_freelist
vm_phys_free_queues[VM_RAW_NFREELIST][VM_NFREEPOOL][VM_NFREEORDER];
static struct vm_freelist
(*vm_phys_lookup_lists[VM_NDOMAIN][VM_RAW_NFREELIST])[VM_NFREEPOOL][VM_NFREEORDER];
static int vm_nfreelists = VM_FREELIST_DEFAULT + 1;
static int cnt_prezero;
SYSCTL_INT(_vm_stats_misc, OID_AUTO, cnt_prezero, CTLFLAG_RD,
&cnt_prezero, 0, "The number of physical pages prezeroed at idle time");
static int sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS);
SYSCTL_OID(_vm, OID_AUTO, phys_free, CTLTYPE_STRING | CTLFLAG_RD,
NULL, 0, sysctl_vm_phys_free, "A", "Phys Free Info");
static int sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS);
SYSCTL_OID(_vm, OID_AUTO, phys_segs, CTLTYPE_STRING | CTLFLAG_RD,
NULL, 0, sysctl_vm_phys_segs, "A", "Phys Seg Info");
#if VM_NDOMAIN > 1
static int sysctl_vm_phys_lookup_lists(SYSCTL_HANDLER_ARGS);
SYSCTL_OID(_vm, OID_AUTO, phys_lookup_lists, CTLTYPE_STRING | CTLFLAG_RD,
NULL, 0, sysctl_vm_phys_lookup_lists, "A", "Phys Lookup Lists");
#endif
static void _vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind,
int domain);
static void vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind);
static int vm_phys_paddr_to_segind(vm_paddr_t pa);
static void vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl,
int order);
/*
* Outputs the state of the physical memory allocator, specifically,
* the amount of physical memory in each free list.
*/
static int
sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS)
{
struct sbuf sbuf;
struct vm_freelist *fl;
int error, flind, oind, pind;
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
for (flind = 0; flind < vm_nfreelists; flind++) {
sbuf_printf(&sbuf, "\nFREE LIST %d:\n"
"\n ORDER (SIZE) | NUMBER"
"\n ", flind);
for (pind = 0; pind < VM_NFREEPOOL; pind++)
sbuf_printf(&sbuf, " | POOL %d", pind);
sbuf_printf(&sbuf, "\n-- ");
for (pind = 0; pind < VM_NFREEPOOL; pind++)
sbuf_printf(&sbuf, "-- -- ");
sbuf_printf(&sbuf, "--\n");
for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
sbuf_printf(&sbuf, " %2d (%6dK)", oind,
1 << (PAGE_SHIFT - 10 + oind));
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
fl = vm_phys_free_queues[flind][pind];
sbuf_printf(&sbuf, " | %6d", fl[oind].lcnt);
}
sbuf_printf(&sbuf, "\n");
}
}
error = sbuf_finish(&sbuf);
sbuf_delete(&sbuf);
return (error);
}
/*
* Outputs the set of physical memory segments.
*/
static int
sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS)
{
struct sbuf sbuf;
struct vm_phys_seg *seg;
int error, segind;
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
for (segind = 0; segind < vm_phys_nsegs; segind++) {
sbuf_printf(&sbuf, "\nSEGMENT %d:\n\n", segind);
seg = &vm_phys_segs[segind];
sbuf_printf(&sbuf, "start: %#jx\n",
(uintmax_t)seg->start);
sbuf_printf(&sbuf, "end: %#jx\n",
(uintmax_t)seg->end);
sbuf_printf(&sbuf, "domain: %d\n", seg->domain);
sbuf_printf(&sbuf, "free list: %p\n", seg->free_queues);
}
error = sbuf_finish(&sbuf);
sbuf_delete(&sbuf);
return (error);
}
#if VM_NDOMAIN > 1
/*
* Outputs the set of free list lookup lists.
*/
static int
sysctl_vm_phys_lookup_lists(SYSCTL_HANDLER_ARGS)
{
struct sbuf sbuf;
int domain, error, flind, ndomains;
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
ndomains = vm_nfreelists - VM_NFREELIST + 1;
for (domain = 0; domain < ndomains; domain++) {
sbuf_printf(&sbuf, "\nDOMAIN %d:\n\n", domain);
for (flind = 0; flind < vm_nfreelists; flind++)
sbuf_printf(&sbuf, " [%d]:\t%p\n", flind,
vm_phys_lookup_lists[domain][flind]);
}
error = sbuf_finish(&sbuf);
sbuf_delete(&sbuf);
return (error);
}
#endif
/*
* Create a physical memory segment.
*/
static void
_vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind, int domain)
{
struct vm_phys_seg *seg;
#ifdef VM_PHYSSEG_SPARSE
long pages;
int segind;
pages = 0;
for (segind = 0; segind < vm_phys_nsegs; segind++) {
seg = &vm_phys_segs[segind];
pages += atop(seg->end - seg->start);
}
#endif
KASSERT(vm_phys_nsegs < VM_PHYSSEG_MAX,
("vm_phys_create_seg: increase VM_PHYSSEG_MAX"));
seg = &vm_phys_segs[vm_phys_nsegs++];
seg->start = start;
seg->end = end;
seg->domain = domain;
#ifdef VM_PHYSSEG_SPARSE
seg->first_page = &vm_page_array[pages];
#else
seg->first_page = PHYS_TO_VM_PAGE(start);
#endif
#if VM_NDOMAIN > 1
if (flind == VM_FREELIST_DEFAULT && domain != 0) {
flind = VM_NFREELIST + (domain - 1);
if (flind >= vm_nfreelists)
vm_nfreelists = flind + 1;
}
#endif
seg->free_queues = &vm_phys_free_queues[flind];
}
static void
vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int flind)
{
int i;
if (mem_affinity == NULL) {
_vm_phys_create_seg(start, end, flind, 0);
return;
}
for (i = 0;; i++) {
if (mem_affinity[i].end == 0)
panic("Reached end of affinity info");
if (mem_affinity[i].end <= start)
continue;
if (mem_affinity[i].start > start)
panic("No affinity info for start %jx",
(uintmax_t)start);
if (mem_affinity[i].end >= end) {
_vm_phys_create_seg(start, end, flind,
mem_affinity[i].domain);
break;
}
_vm_phys_create_seg(start, mem_affinity[i].end, flind,
mem_affinity[i].domain);
start = mem_affinity[i].end;
}
}
/*
* Initialize the physical memory allocator.
*/
void
vm_phys_init(void)
{
struct vm_freelist *fl;
int flind, i, oind, pind;
#if VM_NDOMAIN > 1
int ndomains, j;
#endif
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
#ifdef VM_FREELIST_ISADMA
if (phys_avail[i] < 16777216) {
if (phys_avail[i + 1] > 16777216) {
vm_phys_create_seg(phys_avail[i], 16777216,
VM_FREELIST_ISADMA);
vm_phys_create_seg(16777216, phys_avail[i + 1],
VM_FREELIST_DEFAULT);
} else {
vm_phys_create_seg(phys_avail[i],
phys_avail[i + 1], VM_FREELIST_ISADMA);
}
if (VM_FREELIST_ISADMA >= vm_nfreelists)
vm_nfreelists = VM_FREELIST_ISADMA + 1;
} else
#endif
#ifdef VM_FREELIST_HIGHMEM
if (phys_avail[i + 1] > VM_HIGHMEM_ADDRESS) {
if (phys_avail[i] < VM_HIGHMEM_ADDRESS) {
vm_phys_create_seg(phys_avail[i],
VM_HIGHMEM_ADDRESS, VM_FREELIST_DEFAULT);
vm_phys_create_seg(VM_HIGHMEM_ADDRESS,
phys_avail[i + 1], VM_FREELIST_HIGHMEM);
} else {
vm_phys_create_seg(phys_avail[i],
phys_avail[i + 1], VM_FREELIST_HIGHMEM);
}
if (VM_FREELIST_HIGHMEM >= vm_nfreelists)
vm_nfreelists = VM_FREELIST_HIGHMEM + 1;
} else
#endif
vm_phys_create_seg(phys_avail[i], phys_avail[i + 1],
VM_FREELIST_DEFAULT);
}
for (flind = 0; flind < vm_nfreelists; flind++) {
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
fl = vm_phys_free_queues[flind][pind];
for (oind = 0; oind < VM_NFREEORDER; oind++)
TAILQ_INIT(&fl[oind].pl);
}
}
#if VM_NDOMAIN > 1
/*
* Build a free list lookup list for each domain. All of the
* memory domain lists are inserted at the VM_FREELIST_DEFAULT
* index in a round-robin order starting with the current
* domain.
*/
ndomains = vm_nfreelists - VM_NFREELIST + 1;
for (flind = 0; flind < VM_FREELIST_DEFAULT; flind++)
for (i = 0; i < ndomains; i++)
vm_phys_lookup_lists[i][flind] =
&vm_phys_free_queues[flind];
for (i = 0; i < ndomains; i++)
for (j = 0; j < ndomains; j++) {
flind = (i + j) % ndomains;
if (flind == 0)
flind = VM_FREELIST_DEFAULT;
else
flind += VM_NFREELIST - 1;
vm_phys_lookup_lists[i][VM_FREELIST_DEFAULT + j] =
&vm_phys_free_queues[flind];
}
for (flind = VM_FREELIST_DEFAULT + 1; flind < VM_NFREELIST;
flind++)
for (i = 0; i < ndomains; i++)
vm_phys_lookup_lists[i][flind + ndomains - 1] =
&vm_phys_free_queues[flind];
#else
for (flind = 0; flind < vm_nfreelists; flind++)
vm_phys_lookup_lists[0][flind] = &vm_phys_free_queues[flind];
#endif
mtx_init(&vm_phys_fictitious_reg_mtx, "vmfctr", NULL, MTX_DEF);
}
/*
* Split a contiguous, power of two-sized set of physical pages.
*/
static __inline void
vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl, int order)
{
vm_page_t m_buddy;
while (oind > order) {
oind--;
m_buddy = &m[1 << oind];
KASSERT(m_buddy->order == VM_NFREEORDER,
("vm_phys_split_pages: page %p has unexpected order %d",
m_buddy, m_buddy->order));
m_buddy->order = oind;
TAILQ_INSERT_HEAD(&fl[oind].pl, m_buddy, pageq);
fl[oind].lcnt++;
}
}
/*
* Initialize a physical page and add it to the free lists.
*/
void
vm_phys_add_page(vm_paddr_t pa)
{
vm_page_t m;
cnt.v_page_count++;
m = vm_phys_paddr_to_vm_page(pa);
m->phys_addr = pa;
m->queue = PQ_NONE;
m->segind = vm_phys_paddr_to_segind(pa);
m->flags = PG_FREE;
KASSERT(m->order == VM_NFREEORDER,
("vm_phys_add_page: page %p has unexpected order %d",
m, m->order));
m->pool = VM_FREEPOOL_DEFAULT;
pmap_page_init(m);
mtx_lock(&vm_page_queue_free_mtx);
cnt.v_free_count++;
vm_phys_free_pages(m, 0);
mtx_unlock(&vm_page_queue_free_mtx);
}
/*
* Allocate a contiguous, power of two-sized set of physical pages
* from the free lists.
*
* The free page queues must be locked.
*/
vm_page_t
vm_phys_alloc_pages(int pool, int order)
{
vm_page_t m;
int flind;
for (flind = 0; flind < vm_nfreelists; flind++) {
m = vm_phys_alloc_freelist_pages(flind, pool, order);
if (m != NULL)
return (m);
}
return (NULL);
}
/*
* Find and dequeue a free page on the given free list, with the
* specified pool and order
*/
vm_page_t
vm_phys_alloc_freelist_pages(int flind, int pool, int order)
{
struct vm_freelist *fl;
struct vm_freelist *alt;
int domain, oind, pind;
vm_page_t m;
KASSERT(flind < VM_NFREELIST,
("vm_phys_alloc_freelist_pages: freelist %d is out of range", flind));
KASSERT(pool < VM_NFREEPOOL,
("vm_phys_alloc_freelist_pages: pool %d is out of range", pool));
KASSERT(order < VM_NFREEORDER,
("vm_phys_alloc_freelist_pages: order %d is out of range", order));
#if VM_NDOMAIN > 1
domain = PCPU_GET(domain);
#else
domain = 0;
#endif
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
fl = (*vm_phys_lookup_lists[domain][flind])[pool];
for (oind = order; oind < VM_NFREEORDER; oind++) {
m = TAILQ_FIRST(&fl[oind].pl);
if (m != NULL) {
TAILQ_REMOVE(&fl[oind].pl, m, pageq);
fl[oind].lcnt--;
m->order = VM_NFREEORDER;
vm_phys_split_pages(m, oind, fl, order);
return (m);
}
}
/*
* The given pool was empty. Find the largest
* contiguous, power-of-two-sized set of pages in any
* pool. Transfer these pages to the given pool, and
* use them to satisfy the allocation.
*/
for (oind = VM_NFREEORDER - 1; oind >= order; oind--) {
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
alt = (*vm_phys_lookup_lists[domain][flind])[pind];
m = TAILQ_FIRST(&alt[oind].pl);
if (m != NULL) {
TAILQ_REMOVE(&alt[oind].pl, m, pageq);
alt[oind].lcnt--;
m->order = VM_NFREEORDER;
vm_phys_set_pool(pool, m, oind);
vm_phys_split_pages(m, oind, fl, order);
return (m);
}
}
}
return (NULL);
}
/*
* Allocate physical memory from phys_avail[].
*/
vm_paddr_t
vm_phys_bootstrap_alloc(vm_size_t size, unsigned long alignment)
{
vm_paddr_t pa;
int i;
size = round_page(size);
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
if (phys_avail[i + 1] - phys_avail[i] < size)
continue;
pa = phys_avail[i];
phys_avail[i] += size;
return (pa);
}
panic("vm_phys_bootstrap_alloc");
}
/*
* Find the vm_page corresponding to the given physical address.
*/
vm_page_t
vm_phys_paddr_to_vm_page(vm_paddr_t pa)
{
struct vm_phys_seg *seg;
int segind;
for (segind = 0; segind < vm_phys_nsegs; segind++) {
seg = &vm_phys_segs[segind];
if (pa >= seg->start && pa < seg->end)
return (&seg->first_page[atop(pa - seg->start)]);
}
return (NULL);
}
vm_page_t
vm_phys_fictitious_to_vm_page(vm_paddr_t pa)
{
struct vm_phys_fictitious_seg *seg;
vm_page_t m;
int segind;
m = NULL;
for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
seg = &vm_phys_fictitious_segs[segind];
if (pa >= seg->start && pa < seg->end) {
m = &seg->first_page[atop(pa - seg->start)];
KASSERT((m->flags & PG_FICTITIOUS) != 0,
("%p not fictitious", m));
break;
}
}
return (m);
}
int
vm_phys_fictitious_reg_range(vm_paddr_t start, vm_paddr_t end,
vm_memattr_t memattr)
{
struct vm_phys_fictitious_seg *seg;
vm_page_t fp;
long i, page_count;
int segind;
#ifdef VM_PHYSSEG_DENSE
long pi;
boolean_t malloced;
#endif
page_count = (end - start) / PAGE_SIZE;
#ifdef VM_PHYSSEG_DENSE
pi = atop(start);
if (pi >= first_page && atop(end) < vm_page_array_size) {
fp = &vm_page_array[pi - first_page];
malloced = FALSE;
} else
#endif
{
fp = malloc(page_count * sizeof(struct vm_page), M_FICT_PAGES,
M_WAITOK | M_ZERO);
#ifdef VM_PHYSSEG_DENSE
malloced = TRUE;
#endif
}
for (i = 0; i < page_count; i++) {
vm_page_initfake(&fp[i], start + PAGE_SIZE * i, memattr);
pmap_page_init(&fp[i]);
fp[i].oflags &= ~(VPO_BUSY | VPO_UNMANAGED);
}
mtx_lock(&vm_phys_fictitious_reg_mtx);
for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
seg = &vm_phys_fictitious_segs[segind];
if (seg->start == 0 && seg->end == 0) {
seg->start = start;
seg->end = end;
seg->first_page = fp;
mtx_unlock(&vm_phys_fictitious_reg_mtx);
return (0);
}
}
mtx_unlock(&vm_phys_fictitious_reg_mtx);
#ifdef VM_PHYSSEG_DENSE
if (malloced)
#endif
free(fp, M_FICT_PAGES);
return (EBUSY);
}
void
vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end)
{
struct vm_phys_fictitious_seg *seg;
vm_page_t fp;
int segind;
#ifdef VM_PHYSSEG_DENSE
long pi;
#endif
#ifdef VM_PHYSSEG_DENSE
pi = atop(start);
#endif
mtx_lock(&vm_phys_fictitious_reg_mtx);
for (segind = 0; segind < VM_PHYS_FICTITIOUS_NSEGS; segind++) {
seg = &vm_phys_fictitious_segs[segind];
if (seg->start == start && seg->end == end) {
seg->start = seg->end = 0;
fp = seg->first_page;
seg->first_page = NULL;
mtx_unlock(&vm_phys_fictitious_reg_mtx);
#ifdef VM_PHYSSEG_DENSE
if (pi < first_page || atop(end) >= vm_page_array_size)
#endif
free(fp, M_FICT_PAGES);
return;
}
}
mtx_unlock(&vm_phys_fictitious_reg_mtx);
KASSERT(0, ("Unregistering not registered fictitious range"));
}
/*
* Find the segment containing the given physical address.
*/
static int
vm_phys_paddr_to_segind(vm_paddr_t pa)
{
struct vm_phys_seg *seg;
int segind;
for (segind = 0; segind < vm_phys_nsegs; segind++) {
seg = &vm_phys_segs[segind];
if (pa >= seg->start && pa < seg->end)
return (segind);
}
panic("vm_phys_paddr_to_segind: paddr %#jx is not in any segment" ,
(uintmax_t)pa);
}
/*
* Free a contiguous, power of two-sized set of physical pages.
*
* The free page queues must be locked.
*/
void
vm_phys_free_pages(vm_page_t m, int order)
{
struct vm_freelist *fl;
struct vm_phys_seg *seg;
vm_paddr_t pa, pa_buddy;
vm_page_t m_buddy;
KASSERT(m->order == VM_NFREEORDER,
("vm_phys_free_pages: page %p has unexpected order %d",
m, m->order));
KASSERT(m->pool < VM_NFREEPOOL,
("vm_phys_free_pages: page %p has unexpected pool %d",
m, m->pool));
KASSERT(order < VM_NFREEORDER,
("vm_phys_free_pages: order %d is out of range", order));
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
pa = VM_PAGE_TO_PHYS(m);
seg = &vm_phys_segs[m->segind];
while (order < VM_NFREEORDER - 1) {
pa_buddy = pa ^ (1 << (PAGE_SHIFT + order));
if (pa_buddy < seg->start ||
pa_buddy >= seg->end)
break;
m_buddy = &seg->first_page[atop(pa_buddy - seg->start)];
if (m_buddy->order != order)
break;
fl = (*seg->free_queues)[m_buddy->pool];
TAILQ_REMOVE(&fl[m_buddy->order].pl, m_buddy, pageq);
fl[m_buddy->order].lcnt--;
m_buddy->order = VM_NFREEORDER;
if (m_buddy->pool != m->pool)
vm_phys_set_pool(m->pool, m_buddy, order);
order++;
pa &= ~((1 << (PAGE_SHIFT + order)) - 1);
m = &seg->first_page[atop(pa - seg->start)];
}
m->order = order;
fl = (*seg->free_queues)[m->pool];
TAILQ_INSERT_TAIL(&fl[order].pl, m, pageq);
fl[order].lcnt++;
}
/*
* Set the pool for a contiguous, power of two-sized set of physical pages.
*/
void
vm_phys_set_pool(int pool, vm_page_t m, int order)
{
vm_page_t m_tmp;
for (m_tmp = m; m_tmp < &m[1 << order]; m_tmp++)
m_tmp->pool = pool;
}
/*
* Search for the given physical page "m" in the free lists. If the search
* succeeds, remove "m" from the free lists and return TRUE. Otherwise, return
* FALSE, indicating that "m" is not in the free lists.
*
* The free page queues must be locked.
*/
boolean_t
vm_phys_unfree_page(vm_page_t m)
{
struct vm_freelist *fl;
struct vm_phys_seg *seg;
vm_paddr_t pa, pa_half;
vm_page_t m_set, m_tmp;
int order;
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
/*
* First, find the contiguous, power of two-sized set of free
* physical pages containing the given physical page "m" and
* assign it to "m_set".
*/
seg = &vm_phys_segs[m->segind];
for (m_set = m, order = 0; m_set->order == VM_NFREEORDER &&
order < VM_NFREEORDER - 1; ) {
order++;
pa = m->phys_addr & (~(vm_paddr_t)0 << (PAGE_SHIFT + order));
if (pa >= seg->start)
m_set = &seg->first_page[atop(pa - seg->start)];
else
return (FALSE);
}
if (m_set->order < order)
return (FALSE);
if (m_set->order == VM_NFREEORDER)
return (FALSE);
KASSERT(m_set->order < VM_NFREEORDER,
("vm_phys_unfree_page: page %p has unexpected order %d",
m_set, m_set->order));
/*
* Next, remove "m_set" from the free lists. Finally, extract
* "m" from "m_set" using an iterative algorithm: While "m_set"
* is larger than a page, shrink "m_set" by returning the half
* of "m_set" that does not contain "m" to the free lists.
*/
fl = (*seg->free_queues)[m_set->pool];
order = m_set->order;
TAILQ_REMOVE(&fl[order].pl, m_set, pageq);
fl[order].lcnt--;
m_set->order = VM_NFREEORDER;
while (order > 0) {
order--;
pa_half = m_set->phys_addr ^ (1 << (PAGE_SHIFT + order));
if (m->phys_addr < pa_half)
m_tmp = &seg->first_page[atop(pa_half - seg->start)];
else {
m_tmp = m_set;
m_set = &seg->first_page[atop(pa_half - seg->start)];
}
m_tmp->order = order;
TAILQ_INSERT_HEAD(&fl[order].pl, m_tmp, pageq);
fl[order].lcnt++;
}
KASSERT(m_set == m, ("vm_phys_unfree_page: fatal inconsistency"));
return (TRUE);
}
/*
* Try to zero one physical page. Used by an idle priority thread.
*/
boolean_t
vm_phys_zero_pages_idle(void)
{
static struct vm_freelist *fl = vm_phys_free_queues[0][0];
static int flind, oind, pind;
vm_page_t m, m_tmp;
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
for (;;) {
TAILQ_FOREACH_REVERSE(m, &fl[oind].pl, pglist, pageq) {
for (m_tmp = m; m_tmp < &m[1 << oind]; m_tmp++) {
if ((m_tmp->flags & (PG_CACHED | PG_ZERO)) == 0) {
vm_phys_unfree_page(m_tmp);
cnt.v_free_count--;
mtx_unlock(&vm_page_queue_free_mtx);
pmap_zero_page_idle(m_tmp);
m_tmp->flags |= PG_ZERO;
mtx_lock(&vm_page_queue_free_mtx);
cnt.v_free_count++;
vm_phys_free_pages(m_tmp, 0);
vm_page_zero_count++;
cnt_prezero++;
return (TRUE);
}
}
}
oind++;
if (oind == VM_NFREEORDER) {
oind = 0;
pind++;
if (pind == VM_NFREEPOOL) {
pind = 0;
flind++;
if (flind == vm_nfreelists)
flind = 0;
}
fl = vm_phys_free_queues[flind][pind];
}
}
}
/*
* Allocate a contiguous set of physical pages of the given size
* "npages" from the free lists. All of the physical pages must be at
* or above the given physical address "low" and below the given
* physical address "high". The given value "alignment" determines the
* alignment of the first physical page in the set. If the given value
* "boundary" is non-zero, then the set of physical pages cannot cross
* any physical address boundary that is a multiple of that value. Both
* "alignment" and "boundary" must be a power of two.
*/
vm_page_t
vm_phys_alloc_contig(unsigned long npages, vm_paddr_t low, vm_paddr_t high,
unsigned long alignment, unsigned long boundary)
{
struct vm_freelist *fl;
struct vm_phys_seg *seg;
struct vnode *vp;
vm_paddr_t pa, pa_last, size;
vm_page_t deferred_vdrop_list, m, m_ret;
int domain, flind, i, oind, order, pind;
#if VM_NDOMAIN > 1
domain = PCPU_GET(domain);
#else
domain = 0;
#endif
size = npages << PAGE_SHIFT;
KASSERT(size != 0,
("vm_phys_alloc_contig: size must not be 0"));
KASSERT((alignment & (alignment - 1)) == 0,
("vm_phys_alloc_contig: alignment must be a power of 2"));
KASSERT((boundary & (boundary - 1)) == 0,
("vm_phys_alloc_contig: boundary must be a power of 2"));
deferred_vdrop_list = NULL;
/* Compute the queue that is the best fit for npages. */
for (order = 0; (1 << order) < npages; order++);
mtx_lock(&vm_page_queue_free_mtx);
#if VM_NRESERVLEVEL > 0
retry:
#endif
for (flind = 0; flind < vm_nfreelists; flind++) {
for (oind = min(order, VM_NFREEORDER - 1); oind < VM_NFREEORDER; oind++) {
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
fl = (*vm_phys_lookup_lists[domain][flind])
[pind];
TAILQ_FOREACH(m_ret, &fl[oind].pl, pageq) {
/*
* A free list may contain physical pages
* from one or more segments.
*/
seg = &vm_phys_segs[m_ret->segind];
if (seg->start > high ||
low >= seg->end)
continue;
/*
* Is the size of this allocation request
* larger than the largest block size?
*/
if (order >= VM_NFREEORDER) {
/*
* Determine if a sufficient number
* of subsequent blocks to satisfy
* the allocation request are free.
*/
pa = VM_PAGE_TO_PHYS(m_ret);
pa_last = pa + size;
for (;;) {
pa += 1 << (PAGE_SHIFT + VM_NFREEORDER - 1);
if (pa >= pa_last)
break;
if (pa < seg->start ||
pa >= seg->end)
break;
m = &seg->first_page[atop(pa - seg->start)];
if (m->order != VM_NFREEORDER - 1)
break;
}
/* If not, continue to the next block. */
if (pa < pa_last)
continue;
}
/*
* Determine if the blocks are within the given range,
* satisfy the given alignment, and do not cross the
* given boundary.
*/
pa = VM_PAGE_TO_PHYS(m_ret);
if (pa >= low &&
pa + size <= high &&
(pa & (alignment - 1)) == 0 &&
((pa ^ (pa + size - 1)) & ~(boundary - 1)) == 0)
goto done;
}
}
}
}
#if VM_NRESERVLEVEL > 0
if (vm_reserv_reclaim_contig(size, low, high, alignment, boundary))
goto retry;
#endif
mtx_unlock(&vm_page_queue_free_mtx);
return (NULL);
done:
for (m = m_ret; m < &m_ret[npages]; m = &m[1 << oind]) {
fl = (*seg->free_queues)[m->pool];
TAILQ_REMOVE(&fl[m->order].pl, m, pageq);
fl[m->order].lcnt--;
m->order = VM_NFREEORDER;
}
if (m_ret->pool != VM_FREEPOOL_DEFAULT)
vm_phys_set_pool(VM_FREEPOOL_DEFAULT, m_ret, oind);
fl = (*seg->free_queues)[m_ret->pool];
vm_phys_split_pages(m_ret, oind, fl, order);
for (i = 0; i < npages; i++) {
m = &m_ret[i];
vp = vm_page_alloc_init(m);
if (vp != NULL) {
/*
* Enqueue the vnode for deferred vdrop().
*
* Unmanaged pages don't use "pageq", so it
* can be safely abused to construct a short-
* lived queue of vnodes.
*/
m->pageq.tqe_prev = (void *)vp;
m->pageq.tqe_next = deferred_vdrop_list;
deferred_vdrop_list = m;
}
}
for (; i < roundup2(npages, 1 << imin(oind, order)); i++) {
m = &m_ret[i];
KASSERT(m->order == VM_NFREEORDER,
("vm_phys_alloc_contig: page %p has unexpected order %d",
m, m->order));
vm_phys_free_pages(m, 0);
}
mtx_unlock(&vm_page_queue_free_mtx);
while (deferred_vdrop_list != NULL) {
vdrop((struct vnode *)deferred_vdrop_list->pageq.tqe_prev);
deferred_vdrop_list = deferred_vdrop_list->pageq.tqe_next;
}
return (m_ret);
}
#ifdef DDB
/*
* Show the number of physical pages in each of the free lists.
*/
DB_SHOW_COMMAND(freepages, db_show_freepages)
{
struct vm_freelist *fl;
int flind, oind, pind;
for (flind = 0; flind < vm_nfreelists; flind++) {
db_printf("FREE LIST %d:\n"
"\n ORDER (SIZE) | NUMBER"
"\n ", flind);
for (pind = 0; pind < VM_NFREEPOOL; pind++)
db_printf(" | POOL %d", pind);
db_printf("\n-- ");
for (pind = 0; pind < VM_NFREEPOOL; pind++)
db_printf("-- -- ");
db_printf("--\n");
for (oind = VM_NFREEORDER - 1; oind >= 0; oind--) {
db_printf(" %2.2d (%6.6dK)", oind,
1 << (PAGE_SHIFT - 10 + oind));
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
fl = vm_phys_free_queues[flind][pind];
db_printf(" | %6.6d", fl[oind].lcnt);
}
db_printf("\n");
}
db_printf("\n");
}
}
#endif