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f-stack/freebsd/vm/vm_phys.c

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/*-
* 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.
*/
/*
* Physical memory system implementation
*
* Any external functions defined by this module are only to be used by the
* virtual memory system.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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/proc.h>
#include <sys/queue.h>
#include <sys/rwlock.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/tree.h>
#include <sys/vmmeter.h>
#include <sys/seq.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_domain.h>
_Static_assert(sizeof(long) * NBBY >= VM_PHYSSEG_MAX,
"Too many physsegs.");
#ifdef VM_NUMA_ALLOC
struct mem_affinity *mem_affinity;
int *mem_locality;
#endif
int vm_ndomains = 1;
struct vm_phys_seg vm_phys_segs[VM_PHYSSEG_MAX];
int vm_phys_nsegs;
struct vm_phys_fictitious_seg;
static int vm_phys_fictitious_cmp(struct vm_phys_fictitious_seg *,
struct vm_phys_fictitious_seg *);
RB_HEAD(fict_tree, vm_phys_fictitious_seg) vm_phys_fictitious_tree =
RB_INITIALIZER(_vm_phys_fictitious_tree);
struct vm_phys_fictitious_seg {
RB_ENTRY(vm_phys_fictitious_seg) node;
/* Memory region data */
vm_paddr_t start;
vm_paddr_t end;
vm_page_t first_page;
};
RB_GENERATE_STATIC(fict_tree, vm_phys_fictitious_seg, node,
vm_phys_fictitious_cmp);
static struct rwlock vm_phys_fictitious_reg_lock;
MALLOC_DEFINE(M_FICT_PAGES, "vm_fictitious", "Fictitious VM pages");
static struct vm_freelist
vm_phys_free_queues[MAXMEMDOM][VM_NFREELIST][VM_NFREEPOOL][VM_NFREEORDER];
static int vm_nfreelists;
/*
* Provides the mapping from VM_FREELIST_* to free list indices (flind).
*/
static int vm_freelist_to_flind[VM_NFREELIST];
CTASSERT(VM_FREELIST_DEFAULT == 0);
#ifdef VM_FREELIST_ISADMA
#define VM_ISADMA_BOUNDARY 16777216
#endif
#ifdef VM_FREELIST_DMA32
#define VM_DMA32_BOUNDARY ((vm_paddr_t)1 << 32)
#endif
/*
* Enforce the assumptions made by vm_phys_add_seg() and vm_phys_init() about
* the ordering of the free list boundaries.
*/
#if defined(VM_ISADMA_BOUNDARY) && defined(VM_LOWMEM_BOUNDARY)
CTASSERT(VM_ISADMA_BOUNDARY < VM_LOWMEM_BOUNDARY);
#endif
#if defined(VM_LOWMEM_BOUNDARY) && defined(VM_DMA32_BOUNDARY)
CTASSERT(VM_LOWMEM_BOUNDARY < VM_DMA32_BOUNDARY);
#endif
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");
#ifdef VM_NUMA_ALLOC
static int sysctl_vm_phys_locality(SYSCTL_HANDLER_ARGS);
SYSCTL_OID(_vm, OID_AUTO, phys_locality, CTLTYPE_STRING | CTLFLAG_RD,
NULL, 0, sysctl_vm_phys_locality, "A", "Phys Locality Info");
#endif
SYSCTL_INT(_vm, OID_AUTO, ndomains, CTLFLAG_RD,
&vm_ndomains, 0, "Number of physical memory domains available.");
/*
* Default to first-touch + round-robin.
*/
static struct mtx vm_default_policy_mtx;
MTX_SYSINIT(vm_default_policy, &vm_default_policy_mtx, "default policy mutex",
MTX_DEF);
#ifdef VM_NUMA_ALLOC
static struct vm_domain_policy vm_default_policy =
VM_DOMAIN_POLICY_STATIC_INITIALISER(VM_POLICY_FIRST_TOUCH_ROUND_ROBIN, 0);
#else
/* Use round-robin so the domain policy code will only try once per allocation */
static struct vm_domain_policy vm_default_policy =
VM_DOMAIN_POLICY_STATIC_INITIALISER(VM_POLICY_ROUND_ROBIN, 0);
#endif
static vm_page_t vm_phys_alloc_domain_pages(int domain, int flind, int pool,
int order);
static vm_page_t vm_phys_alloc_seg_contig(struct vm_phys_seg *seg,
u_long npages, vm_paddr_t low, vm_paddr_t high, u_long alignment,
vm_paddr_t boundary);
static void _vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int domain);
static void vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end);
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);
static int
sysctl_vm_default_policy(SYSCTL_HANDLER_ARGS)
{
char policy_name[32];
int error;
mtx_lock(&vm_default_policy_mtx);
/* Map policy to output string */
switch (vm_default_policy.p.policy) {
case VM_POLICY_FIRST_TOUCH:
strcpy(policy_name, "first-touch");
break;
case VM_POLICY_FIRST_TOUCH_ROUND_ROBIN:
strcpy(policy_name, "first-touch-rr");
break;
case VM_POLICY_ROUND_ROBIN:
default:
strcpy(policy_name, "rr");
break;
}
mtx_unlock(&vm_default_policy_mtx);
error = sysctl_handle_string(oidp, &policy_name[0],
sizeof(policy_name), req);
if (error != 0 || req->newptr == NULL)
return (error);
mtx_lock(&vm_default_policy_mtx);
/* Set: match on the subset of policies that make sense as a default */
if (strcmp("first-touch-rr", policy_name) == 0) {
vm_domain_policy_set(&vm_default_policy,
VM_POLICY_FIRST_TOUCH_ROUND_ROBIN, 0);
} else if (strcmp("first-touch", policy_name) == 0) {
vm_domain_policy_set(&vm_default_policy,
VM_POLICY_FIRST_TOUCH, 0);
} else if (strcmp("rr", policy_name) == 0) {
vm_domain_policy_set(&vm_default_policy,
VM_POLICY_ROUND_ROBIN, 0);
} else {
error = EINVAL;
goto finish;
}
error = 0;
finish:
mtx_unlock(&vm_default_policy_mtx);
return (error);
}
SYSCTL_PROC(_vm, OID_AUTO, default_policy, CTLTYPE_STRING | CTLFLAG_RW,
0, 0, sysctl_vm_default_policy, "A",
"Default policy (rr, first-touch, first-touch-rr");
/*
* Red-black tree helpers for vm fictitious range management.
*/
static inline int
vm_phys_fictitious_in_range(struct vm_phys_fictitious_seg *p,
struct vm_phys_fictitious_seg *range)
{
KASSERT(range->start != 0 && range->end != 0,
("Invalid range passed on search for vm_fictitious page"));
if (p->start >= range->end)
return (1);
if (p->start < range->start)
return (-1);
return (0);
}
static int
vm_phys_fictitious_cmp(struct vm_phys_fictitious_seg *p1,
struct vm_phys_fictitious_seg *p2)
{
/* Check if this is a search for a page */
if (p1->end == 0)
return (vm_phys_fictitious_in_range(p1, p2));
KASSERT(p2->end != 0,
("Invalid range passed as second parameter to vm fictitious comparison"));
/* Searching to add a new range */
if (p1->end <= p2->start)
return (-1);
if (p1->start >= p2->end)
return (1);
panic("Trying to add overlapping vm fictitious ranges:\n"
"[%#jx:%#jx] and [%#jx:%#jx]", (uintmax_t)p1->start,
(uintmax_t)p1->end, (uintmax_t)p2->start, (uintmax_t)p2->end);
}
static __inline int
vm_rr_selectdomain(void)
{
#ifdef VM_NUMA_ALLOC
struct thread *td;
td = curthread;
td->td_dom_rr_idx++;
td->td_dom_rr_idx %= vm_ndomains;
return (td->td_dom_rr_idx);
#else
return (0);
#endif
}
/*
* Initialise a VM domain iterator.
*
* Check the thread policy, then the proc policy,
* then default to the system policy.
*
* Later on the various layers will have this logic
* plumbed into them and the phys code will be explicitly
* handed a VM domain policy to use.
*/
static void
vm_policy_iterator_init(struct vm_domain_iterator *vi)
{
#ifdef VM_NUMA_ALLOC
struct vm_domain_policy lcl;
#endif
vm_domain_iterator_init(vi);
#ifdef VM_NUMA_ALLOC
/* Copy out the thread policy */
vm_domain_policy_localcopy(&lcl, &curthread->td_vm_dom_policy);
if (lcl.p.policy != VM_POLICY_NONE) {
/* Thread policy is present; use it */
vm_domain_iterator_set_policy(vi, &lcl);
return;
}
vm_domain_policy_localcopy(&lcl,
&curthread->td_proc->p_vm_dom_policy);
if (lcl.p.policy != VM_POLICY_NONE) {
/* Process policy is present; use it */
vm_domain_iterator_set_policy(vi, &lcl);
return;
}
#endif
/* Use system default policy */
vm_domain_iterator_set_policy(vi, &vm_default_policy);
}
static void
vm_policy_iterator_finish(struct vm_domain_iterator *vi)
{
vm_domain_iterator_cleanup(vi);
}
boolean_t
vm_phys_domain_intersects(long mask, vm_paddr_t low, vm_paddr_t high)
{
struct vm_phys_seg *s;
int idx;
while ((idx = ffsl(mask)) != 0) {
idx--; /* ffsl counts from 1 */
mask &= ~(1UL << idx);
s = &vm_phys_segs[idx];
if (low < s->end && high > s->start)
return (TRUE);
}
return (FALSE);
}
/*
* 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 dom, error, flind, oind, pind;
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sbuf_new_for_sysctl(&sbuf, NULL, 128 * vm_ndomains, req);
for (dom = 0; dom < vm_ndomains; dom++) {
sbuf_printf(&sbuf,"\nDOMAIN %d:\n", dom);
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[dom][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);
}
/*
* Return affinity, or -1 if there's no affinity information.
*/
int
vm_phys_mem_affinity(int f, int t)
{
#ifdef VM_NUMA_ALLOC
if (mem_locality == NULL)
return (-1);
if (f >= vm_ndomains || t >= vm_ndomains)
return (-1);
return (mem_locality[f * vm_ndomains + t]);
#else
return (-1);
#endif
}
#ifdef VM_NUMA_ALLOC
/*
* Outputs the VM locality table.
*/
static int
sysctl_vm_phys_locality(SYSCTL_HANDLER_ARGS)
{
struct sbuf sbuf;
int error, i, j;
error = sysctl_wire_old_buffer(req, 0);
if (error != 0)
return (error);
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
sbuf_printf(&sbuf, "\n");
for (i = 0; i < vm_ndomains; i++) {
sbuf_printf(&sbuf, "%d: ", i);
for (j = 0; j < vm_ndomains; j++) {
sbuf_printf(&sbuf, "%d ", vm_phys_mem_affinity(i, j));
}
sbuf_printf(&sbuf, "\n");
}
error = sbuf_finish(&sbuf);
sbuf_delete(&sbuf);
return (error);
}
#endif
static void
vm_freelist_add(struct vm_freelist *fl, vm_page_t m, int order, int tail)
{
m->order = order;
if (tail)
TAILQ_INSERT_TAIL(&fl[order].pl, m, plinks.q);
else
TAILQ_INSERT_HEAD(&fl[order].pl, m, plinks.q);
fl[order].lcnt++;
}
static void
vm_freelist_rem(struct vm_freelist *fl, vm_page_t m, int order)
{
TAILQ_REMOVE(&fl[order].pl, m, plinks.q);
fl[order].lcnt--;
m->order = VM_NFREEORDER;
}
/*
* Create a physical memory segment.
*/
static void
_vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end, int domain)
{
struct vm_phys_seg *seg;
KASSERT(vm_phys_nsegs < VM_PHYSSEG_MAX,
("vm_phys_create_seg: increase VM_PHYSSEG_MAX"));
KASSERT(domain < vm_ndomains,
("vm_phys_create_seg: invalid domain provided"));
seg = &vm_phys_segs[vm_phys_nsegs++];
while (seg > vm_phys_segs && (seg - 1)->start >= end) {
*seg = *(seg - 1);
seg--;
}
seg->start = start;
seg->end = end;
seg->domain = domain;
}
static void
vm_phys_create_seg(vm_paddr_t start, vm_paddr_t end)
{
#ifdef VM_NUMA_ALLOC
int i;
if (mem_affinity == NULL) {
_vm_phys_create_seg(start, end, 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,
mem_affinity[i].domain);
break;
}
_vm_phys_create_seg(start, mem_affinity[i].end,
mem_affinity[i].domain);
start = mem_affinity[i].end;
}
#else
_vm_phys_create_seg(start, end, 0);
#endif
}
/*
* Add a physical memory segment.
*/
void
vm_phys_add_seg(vm_paddr_t start, vm_paddr_t end)
{
vm_paddr_t paddr;
KASSERT((start & PAGE_MASK) == 0,
("vm_phys_define_seg: start is not page aligned"));
KASSERT((end & PAGE_MASK) == 0,
("vm_phys_define_seg: end is not page aligned"));
/*
* Split the physical memory segment if it spans two or more free
* list boundaries.
*/
paddr = start;
#ifdef VM_FREELIST_ISADMA
if (paddr < VM_ISADMA_BOUNDARY && end > VM_ISADMA_BOUNDARY) {
vm_phys_create_seg(paddr, VM_ISADMA_BOUNDARY);
paddr = VM_ISADMA_BOUNDARY;
}
#endif
#ifdef VM_FREELIST_LOWMEM
if (paddr < VM_LOWMEM_BOUNDARY && end > VM_LOWMEM_BOUNDARY) {
vm_phys_create_seg(paddr, VM_LOWMEM_BOUNDARY);
paddr = VM_LOWMEM_BOUNDARY;
}
#endif
#ifdef VM_FREELIST_DMA32
if (paddr < VM_DMA32_BOUNDARY && end > VM_DMA32_BOUNDARY) {
vm_phys_create_seg(paddr, VM_DMA32_BOUNDARY);
paddr = VM_DMA32_BOUNDARY;
}
#endif
vm_phys_create_seg(paddr, end);
}
/*
* Initialize the physical memory allocator.
*
* Requires that vm_page_array is initialized!
*/
void
vm_phys_init(void)
{
struct vm_freelist *fl;
struct vm_phys_seg *seg;
u_long npages;
int dom, flind, freelist, oind, pind, segind;
/*
* Compute the number of free lists, and generate the mapping from the
* manifest constants VM_FREELIST_* to the free list indices.
*
* Initially, the entries of vm_freelist_to_flind[] are set to either
* 0 or 1 to indicate which free lists should be created.
*/
npages = 0;
for (segind = vm_phys_nsegs - 1; segind >= 0; segind--) {
seg = &vm_phys_segs[segind];
#ifdef VM_FREELIST_ISADMA
if (seg->end <= VM_ISADMA_BOUNDARY)
vm_freelist_to_flind[VM_FREELIST_ISADMA] = 1;
else
#endif
#ifdef VM_FREELIST_LOWMEM
if (seg->end <= VM_LOWMEM_BOUNDARY)
vm_freelist_to_flind[VM_FREELIST_LOWMEM] = 1;
else
#endif
#ifdef VM_FREELIST_DMA32
if (
#ifdef VM_DMA32_NPAGES_THRESHOLD
/*
* Create the DMA32 free list only if the amount of
* physical memory above physical address 4G exceeds the
* given threshold.
*/
npages > VM_DMA32_NPAGES_THRESHOLD &&
#endif
seg->end <= VM_DMA32_BOUNDARY)
vm_freelist_to_flind[VM_FREELIST_DMA32] = 1;
else
#endif
{
npages += atop(seg->end - seg->start);
vm_freelist_to_flind[VM_FREELIST_DEFAULT] = 1;
}
}
/* Change each entry into a running total of the free lists. */
for (freelist = 1; freelist < VM_NFREELIST; freelist++) {
vm_freelist_to_flind[freelist] +=
vm_freelist_to_flind[freelist - 1];
}
vm_nfreelists = vm_freelist_to_flind[VM_NFREELIST - 1];
KASSERT(vm_nfreelists > 0, ("vm_phys_init: no free lists"));
/* Change each entry into a free list index. */
for (freelist = 0; freelist < VM_NFREELIST; freelist++)
vm_freelist_to_flind[freelist]--;
/*
* Initialize the first_page and free_queues fields of each physical
* memory segment.
*/
#ifdef VM_PHYSSEG_SPARSE
npages = 0;
#endif
for (segind = 0; segind < vm_phys_nsegs; segind++) {
seg = &vm_phys_segs[segind];
#ifdef VM_PHYSSEG_SPARSE
seg->first_page = &vm_page_array[npages];
npages += atop(seg->end - seg->start);
#else
seg->first_page = PHYS_TO_VM_PAGE(seg->start);
#endif
#ifdef VM_FREELIST_ISADMA
if (seg->end <= VM_ISADMA_BOUNDARY) {
flind = vm_freelist_to_flind[VM_FREELIST_ISADMA];
KASSERT(flind >= 0,
("vm_phys_init: ISADMA flind < 0"));
} else
#endif
#ifdef VM_FREELIST_LOWMEM
if (seg->end <= VM_LOWMEM_BOUNDARY) {
flind = vm_freelist_to_flind[VM_FREELIST_LOWMEM];
KASSERT(flind >= 0,
("vm_phys_init: LOWMEM flind < 0"));
} else
#endif
#ifdef VM_FREELIST_DMA32
if (seg->end <= VM_DMA32_BOUNDARY) {
flind = vm_freelist_to_flind[VM_FREELIST_DMA32];
KASSERT(flind >= 0,
("vm_phys_init: DMA32 flind < 0"));
} else
#endif
{
flind = vm_freelist_to_flind[VM_FREELIST_DEFAULT];
KASSERT(flind >= 0,
("vm_phys_init: DEFAULT flind < 0"));
}
seg->free_queues = &vm_phys_free_queues[seg->domain][flind];
}
/*
* Initialize the free queues.
*/
for (dom = 0; dom < vm_ndomains; dom++) {
for (flind = 0; flind < vm_nfreelists; flind++) {
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
fl = vm_phys_free_queues[dom][flind][pind];
for (oind = 0; oind < VM_NFREEORDER; oind++)
TAILQ_INIT(&fl[oind].pl);
}
}
}
rw_init(&vm_phys_fictitious_reg_lock, "vmfctr");
}
/*
* 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));
vm_freelist_add(fl, m_buddy, oind, 0);
}
}
/*
* Initialize a physical page and add it to the free lists.
*/
void
vm_phys_add_page(vm_paddr_t pa)
{
vm_page_t m;
struct vm_domain *vmd;
vm_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);
vmd = vm_phys_domain(m);
vmd->vmd_page_count++;
vmd->vmd_segs |= 1UL << m->segind;
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);
vm_phys_freecnt_adj(m, 1);
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 domain, flind;
struct vm_domain_iterator vi;
KASSERT(pool < VM_NFREEPOOL,
("vm_phys_alloc_pages: pool %d is out of range", pool));
KASSERT(order < VM_NFREEORDER,
("vm_phys_alloc_pages: order %d is out of range", order));
vm_policy_iterator_init(&vi);
while ((vm_domain_iterator_run(&vi, &domain)) == 0) {
for (flind = 0; flind < vm_nfreelists; flind++) {
m = vm_phys_alloc_domain_pages(domain, flind, pool,
order);
if (m != NULL)
return (m);
}
}
vm_policy_iterator_finish(&vi);
return (NULL);
}
/*
* Allocate a contiguous, power of two-sized set of physical pages from the
* specified free list. The free list must be specified using one of the
* manifest constants VM_FREELIST_*.
*
* The free page queues must be locked.
*/
vm_page_t
vm_phys_alloc_freelist_pages(int freelist, int pool, int order)
{
vm_page_t m;
struct vm_domain_iterator vi;
int domain;
KASSERT(freelist < VM_NFREELIST,
("vm_phys_alloc_freelist_pages: freelist %d is out of range",
freelist));
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));
vm_policy_iterator_init(&vi);
while ((vm_domain_iterator_run(&vi, &domain)) == 0) {
m = vm_phys_alloc_domain_pages(domain,
vm_freelist_to_flind[freelist], pool, order);
if (m != NULL)
return (m);
}
vm_policy_iterator_finish(&vi);
return (NULL);
}
static vm_page_t
vm_phys_alloc_domain_pages(int domain, int flind, int pool, int order)
{
struct vm_freelist *fl;
struct vm_freelist *alt;
int oind, pind;
vm_page_t m;
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
fl = &vm_phys_free_queues[domain][flind][pool][0];
for (oind = order; oind < VM_NFREEORDER; oind++) {
m = TAILQ_FIRST(&fl[oind].pl);
if (m != NULL) {
vm_freelist_rem(fl, m, oind);
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_free_queues[domain][flind][pind][0];
m = TAILQ_FIRST(&alt[oind].pl);
if (m != NULL) {
vm_freelist_rem(alt, m, oind);
vm_phys_set_pool(pool, m, oind);
vm_phys_split_pages(m, oind, fl, order);
return (m);
}
}
}
return (NULL);
}
/*
* 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 tmp, *seg;
vm_page_t m;
m = NULL;
tmp.start = pa;
tmp.end = 0;
rw_rlock(&vm_phys_fictitious_reg_lock);
seg = RB_FIND(fict_tree, &vm_phys_fictitious_tree, &tmp);
rw_runlock(&vm_phys_fictitious_reg_lock);
if (seg == NULL)
return (NULL);
m = &seg->first_page[atop(pa - seg->start)];
KASSERT((m->flags & PG_FICTITIOUS) != 0, ("%p not fictitious", m));
return (m);
}
static inline void
vm_phys_fictitious_init_range(vm_page_t range, vm_paddr_t start,
long page_count, vm_memattr_t memattr)
{
long i;
for (i = 0; i < page_count; i++) {
vm_page_initfake(&range[i], start + PAGE_SIZE * i, memattr);
range[i].oflags &= ~VPO_UNMANAGED;
range[i].busy_lock = VPB_UNBUSIED;
}
}
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 page_count;
#ifdef VM_PHYSSEG_DENSE
long pi, pe;
long dpage_count;
#endif
KASSERT(start < end,
("Start of segment isn't less than end (start: %jx end: %jx)",
(uintmax_t)start, (uintmax_t)end));
page_count = (end - start) / PAGE_SIZE;
#ifdef VM_PHYSSEG_DENSE
pi = atop(start);
pe = atop(end);
if (pi >= first_page && (pi - first_page) < vm_page_array_size) {
fp = &vm_page_array[pi - first_page];
if ((pe - first_page) > vm_page_array_size) {
/*
* We have a segment that starts inside
* of vm_page_array, but ends outside of it.
*
* Use vm_page_array pages for those that are
* inside of the vm_page_array range, and
* allocate the remaining ones.
*/
dpage_count = vm_page_array_size - (pi - first_page);
vm_phys_fictitious_init_range(fp, start, dpage_count,
memattr);
page_count -= dpage_count;
start += ptoa(dpage_count);
goto alloc;
}
/*
* We can allocate the full range from vm_page_array,
* so there's no need to register the range in the tree.
*/
vm_phys_fictitious_init_range(fp, start, page_count, memattr);
return (0);
} else if (pe > first_page && (pe - first_page) < vm_page_array_size) {
/*
* We have a segment that ends inside of vm_page_array,
* but starts outside of it.
*/
fp = &vm_page_array[0];
dpage_count = pe - first_page;
vm_phys_fictitious_init_range(fp, ptoa(first_page), dpage_count,
memattr);
end -= ptoa(dpage_count);
page_count -= dpage_count;
goto alloc;
} else if (pi < first_page && pe > (first_page + vm_page_array_size)) {
/*
* Trying to register a fictitious range that expands before
* and after vm_page_array.
*/
return (EINVAL);
} else {
alloc:
#endif
fp = malloc(page_count * sizeof(struct vm_page), M_FICT_PAGES,
M_WAITOK | M_ZERO);
#ifdef VM_PHYSSEG_DENSE
}
#endif
vm_phys_fictitious_init_range(fp, start, page_count, memattr);
seg = malloc(sizeof(*seg), M_FICT_PAGES, M_WAITOK | M_ZERO);
seg->start = start;
seg->end = end;
seg->first_page = fp;
rw_wlock(&vm_phys_fictitious_reg_lock);
RB_INSERT(fict_tree, &vm_phys_fictitious_tree, seg);
rw_wunlock(&vm_phys_fictitious_reg_lock);
return (0);
}
void
vm_phys_fictitious_unreg_range(vm_paddr_t start, vm_paddr_t end)
{
struct vm_phys_fictitious_seg *seg, tmp;
#ifdef VM_PHYSSEG_DENSE
long pi, pe;
#endif
KASSERT(start < end,
("Start of segment isn't less than end (start: %jx end: %jx)",
(uintmax_t)start, (uintmax_t)end));
#ifdef VM_PHYSSEG_DENSE
pi = atop(start);
pe = atop(end);
if (pi >= first_page && (pi - first_page) < vm_page_array_size) {
if ((pe - first_page) <= vm_page_array_size) {
/*
* This segment was allocated using vm_page_array
* only, there's nothing to do since those pages
* were never added to the tree.
*/
return;
}
/*
* We have a segment that starts inside
* of vm_page_array, but ends outside of it.
*
* Calculate how many pages were added to the
* tree and free them.
*/
start = ptoa(first_page + vm_page_array_size);
} else if (pe > first_page && (pe - first_page) < vm_page_array_size) {
/*
* We have a segment that ends inside of vm_page_array,
* but starts outside of it.
*/
end = ptoa(first_page);
} else if (pi < first_page && pe > (first_page + vm_page_array_size)) {
/* Since it's not possible to register such a range, panic. */
panic(
"Unregistering not registered fictitious range [%#jx:%#jx]",
(uintmax_t)start, (uintmax_t)end);
}
#endif
tmp.start = start;
tmp.end = 0;
rw_wlock(&vm_phys_fictitious_reg_lock);
seg = RB_FIND(fict_tree, &vm_phys_fictitious_tree, &tmp);
if (seg->start != start || seg->end != end) {
rw_wunlock(&vm_phys_fictitious_reg_lock);
panic(
"Unregistering not registered fictitious range [%#jx:%#jx]",
(uintmax_t)start, (uintmax_t)end);
}
RB_REMOVE(fict_tree, &vm_phys_fictitious_tree, seg);
rw_wunlock(&vm_phys_fictitious_reg_lock);
free(seg->first_page, M_FICT_PAGES);
free(seg, M_FICT_PAGES);
}
/*
* 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;
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);
seg = &vm_phys_segs[m->segind];
if (order < VM_NFREEORDER - 1) {
pa = VM_PAGE_TO_PHYS(m);
do {
pa ^= ((vm_paddr_t)1 << (PAGE_SHIFT + order));
if (pa < seg->start || pa >= seg->end)
break;
m_buddy = &seg->first_page[atop(pa - seg->start)];
if (m_buddy->order != order)
break;
fl = (*seg->free_queues)[m_buddy->pool];
vm_freelist_rem(fl, m_buddy, order);
if (m_buddy->pool != m->pool)
vm_phys_set_pool(m->pool, m_buddy, order);
order++;
pa &= ~(((vm_paddr_t)1 << (PAGE_SHIFT + order)) - 1);
m = &seg->first_page[atop(pa - seg->start)];
} while (order < VM_NFREEORDER - 1);
}
fl = (*seg->free_queues)[m->pool];
vm_freelist_add(fl, m, order, 1);
}
/*
* Free a contiguous, arbitrarily sized set of physical pages.
*
* The free page queues must be locked.
*/
void
vm_phys_free_contig(vm_page_t m, u_long npages)
{
u_int n;
int order;
/*
* Avoid unnecessary coalescing by freeing the pages in the largest
* possible power-of-two-sized subsets.
*/
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
for (;; npages -= n) {
/*
* Unsigned "min" is used here so that "order" is assigned
* "VM_NFREEORDER - 1" when "m"'s physical address is zero
* or the low-order bits of its physical address are zero
* because the size of a physical address exceeds the size of
* a long.
*/
order = min(ffsl(VM_PAGE_TO_PHYS(m) >> PAGE_SHIFT) - 1,
VM_NFREEORDER - 1);
n = 1 << order;
if (npages < n)
break;
vm_phys_free_pages(m, order);
m += n;
}
/* The residual "npages" is less than "1 << (VM_NFREEORDER - 1)". */
for (; npages > 0; npages -= n) {
order = flsl(npages) - 1;
n = 1 << order;
vm_phys_free_pages(m, order);
m += n;
}
}
/*
* Scan physical memory between the specified addresses "low" and "high" for a
* run of contiguous physical pages that satisfy the specified conditions, and
* return the lowest page in the run. The specified "alignment" determines
* the alignment of the lowest physical page in the run. If the specified
* "boundary" is non-zero, then the run of physical pages cannot span a
* physical address that is a multiple of "boundary".
*
* "npages" must be greater than zero. Both "alignment" and "boundary" must
* be a power of two.
*/
vm_page_t
vm_phys_scan_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
u_long alignment, vm_paddr_t boundary, int options)
{
vm_paddr_t pa_end;
vm_page_t m_end, m_run, m_start;
struct vm_phys_seg *seg;
int segind;
KASSERT(npages > 0, ("npages is 0"));
KASSERT(powerof2(alignment), ("alignment is not a power of 2"));
KASSERT(powerof2(boundary), ("boundary is not a power of 2"));
if (low >= high)
return (NULL);
for (segind = 0; segind < vm_phys_nsegs; segind++) {
seg = &vm_phys_segs[segind];
if (seg->start >= high)
break;
if (low >= seg->end)
continue;
if (low <= seg->start)
m_start = seg->first_page;
else
m_start = &seg->first_page[atop(low - seg->start)];
if (high < seg->end)
pa_end = high;
else
pa_end = seg->end;
if (pa_end - VM_PAGE_TO_PHYS(m_start) < ptoa(npages))
continue;
m_end = &seg->first_page[atop(pa_end - seg->start)];
m_run = vm_page_scan_contig(npages, m_start, m_end,
alignment, boundary, options);
if (m_run != NULL)
return (m_run);
}
return (NULL);
}
/*
* 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;
vm_freelist_rem(fl, m_set, order);
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)];
}
vm_freelist_add(fl, m_tmp, order, 0);
}
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;
static int flind, oind, pind;
vm_page_t m, m_tmp;
int domain;
domain = vm_rr_selectdomain();
fl = vm_phys_free_queues[domain][0][0];
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
for (;;) {
TAILQ_FOREACH_REVERSE(m, &fl[oind].pl, pglist, plinks.q) {
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);
vm_phys_freecnt_adj(m, -1);
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);
vm_phys_freecnt_adj(m, 1);
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[domain][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(u_long npages, vm_paddr_t low, vm_paddr_t high,
u_long alignment, vm_paddr_t boundary)
{
vm_paddr_t pa_end, pa_start;
vm_page_t m_run;
struct vm_domain_iterator vi;
struct vm_phys_seg *seg;
int domain, segind;
KASSERT(npages > 0, ("npages is 0"));
KASSERT(powerof2(alignment), ("alignment is not a power of 2"));
KASSERT(powerof2(boundary), ("boundary is not a power of 2"));
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
if (low >= high)
return (NULL);
vm_policy_iterator_init(&vi);
restartdom:
if (vm_domain_iterator_run(&vi, &domain) != 0) {
vm_policy_iterator_finish(&vi);
return (NULL);
}
m_run = NULL;
for (segind = vm_phys_nsegs - 1; segind >= 0; segind--) {
seg = &vm_phys_segs[segind];
if (seg->start >= high || seg->domain != domain)
continue;
if (low >= seg->end)
break;
if (low <= seg->start)
pa_start = seg->start;
else
pa_start = low;
if (high < seg->end)
pa_end = high;
else
pa_end = seg->end;
if (pa_end - pa_start < ptoa(npages))
continue;
m_run = vm_phys_alloc_seg_contig(seg, npages, low, high,
alignment, boundary);
if (m_run != NULL)
break;
}
if (m_run == NULL && !vm_domain_iterator_isdone(&vi))
goto restartdom;
vm_policy_iterator_finish(&vi);
return (m_run);
}
/*
* Allocate a run of contiguous physical pages from the free list for the
* specified segment.
*/
static vm_page_t
vm_phys_alloc_seg_contig(struct vm_phys_seg *seg, u_long npages,
vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary)
{
struct vm_freelist *fl;
vm_paddr_t pa, pa_end, size;
vm_page_t m, m_ret;
u_long npages_end;
int oind, order, pind;
KASSERT(npages > 0, ("npages is 0"));
KASSERT(powerof2(alignment), ("alignment is not a power of 2"));
KASSERT(powerof2(boundary), ("boundary is not a power of 2"));
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
/* Compute the queue that is the best fit for npages. */
for (order = 0; (1 << order) < npages; order++);
/* Search for a run satisfying the specified conditions. */
size = npages << PAGE_SHIFT;
for (oind = min(order, VM_NFREEORDER - 1); oind < VM_NFREEORDER;
oind++) {
for (pind = 0; pind < VM_NFREEPOOL; pind++) {
fl = (*seg->free_queues)[pind];
TAILQ_FOREACH(m_ret, &fl[oind].pl, plinks.q) {
/*
* 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_end = pa + size;
for (;;) {
pa += 1 << (PAGE_SHIFT +
VM_NFREEORDER - 1);
if (pa >= pa_end ||
pa < seg->start ||
pa >= seg->end)
break;
m = &seg->first_page[atop(pa -
seg->start)];
if (m->order != VM_NFREEORDER -
1)
break;
}
/* If not, go to the next block. */
if (pa < pa_end)
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);
pa_end = pa + size;
if (pa >= low && pa_end <= high &&
(pa & (alignment - 1)) == 0 &&
rounddown2(pa ^ (pa_end - 1), boundary) == 0)
goto done;
}
}
}
return (NULL);
done:
for (m = m_ret; m < &m_ret[npages]; m = &m[1 << oind]) {
fl = (*seg->free_queues)[m->pool];
vm_freelist_rem(fl, m, m->order);
}
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);
/* Return excess pages to the free lists. */
npages_end = roundup2(npages, 1 << imin(oind, order));
if (npages < npages_end)
vm_phys_free_contig(&m_ret[npages], npages_end - npages);
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, dom;
for (dom = 0; dom < vm_ndomains; dom++) {
db_printf("DOMAIN: %d\n", dom);
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[dom][flind][pind];
db_printf(" | %6.6d", fl[oind].lcnt);
}
db_printf("\n");
}
db_printf("\n");
}
db_printf("\n");
}
}
#endif
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