mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
00f0e671ff
sbuf_new_for_sysctl(9). This allows using an sbuf with a SYSCTL_OUT drain for extremely large amounts of data where the caller knows that appropriate references are held, and sleeping is not an issue. Inspired by: rwatson
731 lines
21 KiB
C
731 lines
21 KiB
C
/*-
|
|
* Copyright (c) 2002-2006 Rice University
|
|
* Copyright (c) 2007-2008 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.
|
|
*/
|
|
|
|
/*
|
|
* Superpage reservation management module
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_vm.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/sbuf.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_phys.h>
|
|
#include <vm/vm_reserv.h>
|
|
|
|
/*
|
|
* The reservation system supports the speculative allocation of large physical
|
|
* pages ("superpages"). Speculative allocation enables the fully-automatic
|
|
* utilization of superpages by the virtual memory system. In other words, no
|
|
* programmatic directives are required to use superpages.
|
|
*/
|
|
|
|
#if VM_NRESERVLEVEL > 0
|
|
|
|
/*
|
|
* The number of small pages that are contained in a level 0 reservation
|
|
*/
|
|
#define VM_LEVEL_0_NPAGES (1 << VM_LEVEL_0_ORDER)
|
|
|
|
/*
|
|
* The number of bits by which a physical address is shifted to obtain the
|
|
* reservation number
|
|
*/
|
|
#define VM_LEVEL_0_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT)
|
|
|
|
/*
|
|
* The size of a level 0 reservation in bytes
|
|
*/
|
|
#define VM_LEVEL_0_SIZE (1 << VM_LEVEL_0_SHIFT)
|
|
|
|
/*
|
|
* Computes the index of the small page underlying the given (object, pindex)
|
|
* within the reservation's array of small pages.
|
|
*/
|
|
#define VM_RESERV_INDEX(object, pindex) \
|
|
(((object)->pg_color + (pindex)) & (VM_LEVEL_0_NPAGES - 1))
|
|
|
|
/*
|
|
* The reservation structure
|
|
*
|
|
* A reservation structure is constructed whenever a large physical page is
|
|
* speculatively allocated to an object. The reservation provides the small
|
|
* physical pages for the range [pindex, pindex + VM_LEVEL_0_NPAGES) of offsets
|
|
* within that object. The reservation's "popcnt" tracks the number of these
|
|
* small physical pages that are in use at any given time. When and if the
|
|
* reservation is not fully utilized, it appears in the queue of partially-
|
|
* populated reservations. The reservation always appears on the containing
|
|
* object's list of reservations.
|
|
*
|
|
* A partially-populated reservation can be broken and reclaimed at any time.
|
|
*/
|
|
struct vm_reserv {
|
|
TAILQ_ENTRY(vm_reserv) partpopq;
|
|
LIST_ENTRY(vm_reserv) objq;
|
|
vm_object_t object; /* containing object */
|
|
vm_pindex_t pindex; /* offset within object */
|
|
vm_page_t pages; /* first page of a superpage */
|
|
int popcnt; /* # of pages in use */
|
|
char inpartpopq;
|
|
};
|
|
|
|
/*
|
|
* The reservation array
|
|
*
|
|
* This array is analoguous in function to vm_page_array. It differs in the
|
|
* respect that it may contain a greater number of useful reservation
|
|
* structures than there are (physical) superpages. These "invalid"
|
|
* reservation structures exist to trade-off space for time in the
|
|
* implementation of vm_reserv_from_page(). Invalid reservation structures are
|
|
* distinguishable from "valid" reservation structures by inspecting the
|
|
* reservation's "pages" field. Invalid reservation structures have a NULL
|
|
* "pages" field.
|
|
*
|
|
* vm_reserv_from_page() maps a small (physical) page to an element of this
|
|
* array by computing a physical reservation number from the page's physical
|
|
* address. The physical reservation number is used as the array index.
|
|
*
|
|
* An "active" reservation is a valid reservation structure that has a non-NULL
|
|
* "object" field and a non-zero "popcnt" field. In other words, every active
|
|
* reservation belongs to a particular object. Moreover, every active
|
|
* reservation has an entry in the containing object's list of reservations.
|
|
*/
|
|
static vm_reserv_t vm_reserv_array;
|
|
|
|
/*
|
|
* The partially-populated reservation queue
|
|
*
|
|
* This queue enables the fast recovery of an unused cached or free small page
|
|
* from a partially-populated reservation. The reservation at the head of
|
|
* this queue is the least-recently-changed, partially-populated reservation.
|
|
*
|
|
* Access to this queue is synchronized by the free page queue lock.
|
|
*/
|
|
static TAILQ_HEAD(, vm_reserv) vm_rvq_partpop =
|
|
TAILQ_HEAD_INITIALIZER(vm_rvq_partpop);
|
|
|
|
static SYSCTL_NODE(_vm, OID_AUTO, reserv, CTLFLAG_RD, 0, "Reservation Info");
|
|
|
|
static long vm_reserv_broken;
|
|
SYSCTL_LONG(_vm_reserv, OID_AUTO, broken, CTLFLAG_RD,
|
|
&vm_reserv_broken, 0, "Cumulative number of broken reservations");
|
|
|
|
static long vm_reserv_freed;
|
|
SYSCTL_LONG(_vm_reserv, OID_AUTO, freed, CTLFLAG_RD,
|
|
&vm_reserv_freed, 0, "Cumulative number of freed reservations");
|
|
|
|
static int sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS);
|
|
|
|
SYSCTL_OID(_vm_reserv, OID_AUTO, partpopq, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
|
|
sysctl_vm_reserv_partpopq, "A", "Partially-populated reservation queues");
|
|
|
|
static long vm_reserv_reclaimed;
|
|
SYSCTL_LONG(_vm_reserv, OID_AUTO, reclaimed, CTLFLAG_RD,
|
|
&vm_reserv_reclaimed, 0, "Cumulative number of reclaimed reservations");
|
|
|
|
static void vm_reserv_depopulate(vm_reserv_t rv);
|
|
static vm_reserv_t vm_reserv_from_page(vm_page_t m);
|
|
static boolean_t vm_reserv_has_pindex(vm_reserv_t rv,
|
|
vm_pindex_t pindex);
|
|
static void vm_reserv_populate(vm_reserv_t rv);
|
|
static void vm_reserv_reclaim(vm_reserv_t rv);
|
|
|
|
/*
|
|
* Describes the current state of the partially-populated reservation queue.
|
|
*/
|
|
static int
|
|
sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sbuf sbuf;
|
|
vm_reserv_t rv;
|
|
int counter, error, level, unused_pages;
|
|
|
|
error = sysctl_wire_old_buffer(req, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
sbuf_new_for_sysctl(&sbuf, NULL, 128, req);
|
|
sbuf_printf(&sbuf, "\nLEVEL SIZE NUMBER\n\n");
|
|
for (level = -1; level <= VM_NRESERVLEVEL - 2; level++) {
|
|
counter = 0;
|
|
unused_pages = 0;
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
TAILQ_FOREACH(rv, &vm_rvq_partpop/*[level]*/, partpopq) {
|
|
counter++;
|
|
unused_pages += VM_LEVEL_0_NPAGES - rv->popcnt;
|
|
}
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
sbuf_printf(&sbuf, "%5d: %6dK, %6d\n", level,
|
|
unused_pages * ((int)PAGE_SIZE / 1024), counter);
|
|
}
|
|
error = sbuf_finish(&sbuf);
|
|
sbuf_delete(&sbuf);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Reduces the given reservation's population count. If the population count
|
|
* becomes zero, the reservation is destroyed. Additionally, moves the
|
|
* reservation to the tail of the partially-populated reservations queue if the
|
|
* population count is non-zero.
|
|
*
|
|
* The free page queue lock must be held.
|
|
*/
|
|
static void
|
|
vm_reserv_depopulate(vm_reserv_t rv)
|
|
{
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
KASSERT(rv->object != NULL,
|
|
("vm_reserv_depopulate: reserv %p is free", rv));
|
|
KASSERT(rv->popcnt > 0,
|
|
("vm_reserv_depopulate: reserv %p's popcnt is corrupted", rv));
|
|
if (rv->inpartpopq) {
|
|
TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
|
|
rv->inpartpopq = FALSE;
|
|
}
|
|
rv->popcnt--;
|
|
if (rv->popcnt == 0) {
|
|
LIST_REMOVE(rv, objq);
|
|
rv->object = NULL;
|
|
vm_phys_free_pages(rv->pages, VM_LEVEL_0_ORDER);
|
|
vm_reserv_freed++;
|
|
} else {
|
|
rv->inpartpopq = TRUE;
|
|
TAILQ_INSERT_TAIL(&vm_rvq_partpop, rv, partpopq);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns the reservation to which the given page might belong.
|
|
*/
|
|
static __inline vm_reserv_t
|
|
vm_reserv_from_page(vm_page_t m)
|
|
{
|
|
|
|
return (&vm_reserv_array[VM_PAGE_TO_PHYS(m) >> VM_LEVEL_0_SHIFT]);
|
|
}
|
|
|
|
/*
|
|
* Returns TRUE if the given reservation contains the given page index and
|
|
* FALSE otherwise.
|
|
*/
|
|
static __inline boolean_t
|
|
vm_reserv_has_pindex(vm_reserv_t rv, vm_pindex_t pindex)
|
|
{
|
|
|
|
return (((pindex - rv->pindex) & ~(VM_LEVEL_0_NPAGES - 1)) == 0);
|
|
}
|
|
|
|
/*
|
|
* Increases the given reservation's population count. Moves the reservation
|
|
* to the tail of the partially-populated reservation queue.
|
|
*
|
|
* The free page queue must be locked.
|
|
*/
|
|
static void
|
|
vm_reserv_populate(vm_reserv_t rv)
|
|
{
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
KASSERT(rv->object != NULL,
|
|
("vm_reserv_populate: reserv %p is free", rv));
|
|
KASSERT(rv->popcnt < VM_LEVEL_0_NPAGES,
|
|
("vm_reserv_populate: reserv %p is already full", rv));
|
|
if (rv->inpartpopq) {
|
|
TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
|
|
rv->inpartpopq = FALSE;
|
|
}
|
|
rv->popcnt++;
|
|
if (rv->popcnt < VM_LEVEL_0_NPAGES) {
|
|
rv->inpartpopq = TRUE;
|
|
TAILQ_INSERT_TAIL(&vm_rvq_partpop, rv, partpopq);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocates a page from an existing or newly-created reservation.
|
|
*
|
|
* The object and free page queue must be locked.
|
|
*/
|
|
vm_page_t
|
|
vm_reserv_alloc_page(vm_object_t object, vm_pindex_t pindex)
|
|
{
|
|
vm_page_t m, mpred, msucc;
|
|
vm_pindex_t first, leftcap, rightcap;
|
|
vm_reserv_t rv;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
|
|
/*
|
|
* Is a reservation fundamentally not possible?
|
|
*/
|
|
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
|
|
if (pindex < VM_RESERV_INDEX(object, pindex) ||
|
|
pindex >= object->size)
|
|
return (NULL);
|
|
|
|
/*
|
|
* Look for an existing reservation.
|
|
*/
|
|
msucc = NULL;
|
|
mpred = object->root;
|
|
while (mpred != NULL) {
|
|
KASSERT(mpred->pindex != pindex,
|
|
("vm_reserv_alloc_page: pindex already allocated"));
|
|
rv = vm_reserv_from_page(mpred);
|
|
if (rv->object == object && vm_reserv_has_pindex(rv, pindex)) {
|
|
m = &rv->pages[VM_RESERV_INDEX(object, pindex)];
|
|
/* Handle vm_page_rename(m, new_object, ...). */
|
|
if ((m->flags & (PG_CACHED | PG_FREE)) == 0)
|
|
return (NULL);
|
|
vm_reserv_populate(rv);
|
|
return (m);
|
|
} else if (mpred->pindex < pindex) {
|
|
if (msucc != NULL ||
|
|
(msucc = TAILQ_NEXT(mpred, listq)) == NULL)
|
|
break;
|
|
KASSERT(msucc->pindex != pindex,
|
|
("vm_reserv_alloc_page: pindex already allocated"));
|
|
rv = vm_reserv_from_page(msucc);
|
|
if (rv->object == object &&
|
|
vm_reserv_has_pindex(rv, pindex)) {
|
|
m = &rv->pages[VM_RESERV_INDEX(object, pindex)];
|
|
/* Handle vm_page_rename(m, new_object, ...). */
|
|
if ((m->flags & (PG_CACHED | PG_FREE)) == 0)
|
|
return (NULL);
|
|
vm_reserv_populate(rv);
|
|
return (m);
|
|
} else if (pindex < msucc->pindex)
|
|
break;
|
|
} else if (msucc == NULL) {
|
|
msucc = mpred;
|
|
mpred = TAILQ_PREV(msucc, pglist, listq);
|
|
continue;
|
|
}
|
|
msucc = NULL;
|
|
mpred = object->root = vm_page_splay(pindex, object->root);
|
|
}
|
|
|
|
/*
|
|
* Determine the first index to the left that can be used.
|
|
*/
|
|
if (mpred == NULL)
|
|
leftcap = 0;
|
|
else if ((rv = vm_reserv_from_page(mpred))->object != object)
|
|
leftcap = mpred->pindex + 1;
|
|
else
|
|
leftcap = rv->pindex + VM_LEVEL_0_NPAGES;
|
|
|
|
/*
|
|
* Determine the first index to the right that cannot be used.
|
|
*/
|
|
if (msucc == NULL)
|
|
rightcap = pindex + VM_LEVEL_0_NPAGES;
|
|
else if ((rv = vm_reserv_from_page(msucc))->object != object)
|
|
rightcap = msucc->pindex;
|
|
else
|
|
rightcap = rv->pindex;
|
|
|
|
/*
|
|
* Determine if a reservation fits between the first index to
|
|
* the left that can be used and the first index to the right
|
|
* that cannot be used.
|
|
*/
|
|
first = pindex - VM_RESERV_INDEX(object, pindex);
|
|
if (first < leftcap || first + VM_LEVEL_0_NPAGES > rightcap)
|
|
return (NULL);
|
|
|
|
/*
|
|
* Would a new reservation extend past the end of the given object?
|
|
*/
|
|
if (object->size < first + VM_LEVEL_0_NPAGES) {
|
|
/*
|
|
* Don't allocate a new reservation if the object is a vnode or
|
|
* backed by another object that is a vnode.
|
|
*/
|
|
if (object->type == OBJT_VNODE ||
|
|
(object->backing_object != NULL &&
|
|
object->backing_object->type == OBJT_VNODE))
|
|
return (NULL);
|
|
/* Speculate that the object may grow. */
|
|
}
|
|
|
|
/*
|
|
* Allocate a new reservation.
|
|
*/
|
|
m = vm_phys_alloc_pages(VM_FREEPOOL_DEFAULT, VM_LEVEL_0_ORDER);
|
|
if (m != NULL) {
|
|
rv = vm_reserv_from_page(m);
|
|
KASSERT(rv->pages == m,
|
|
("vm_reserv_alloc_page: reserv %p's pages is corrupted",
|
|
rv));
|
|
KASSERT(rv->object == NULL,
|
|
("vm_reserv_alloc_page: reserv %p isn't free", rv));
|
|
LIST_INSERT_HEAD(&object->rvq, rv, objq);
|
|
rv->object = object;
|
|
rv->pindex = first;
|
|
KASSERT(rv->popcnt == 0,
|
|
("vm_reserv_alloc_page: reserv %p's popcnt is corrupted",
|
|
rv));
|
|
KASSERT(!rv->inpartpopq,
|
|
("vm_reserv_alloc_page: reserv %p's inpartpopq is TRUE",
|
|
rv));
|
|
vm_reserv_populate(rv);
|
|
m = &rv->pages[VM_RESERV_INDEX(object, pindex)];
|
|
}
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Breaks all reservations belonging to the given object.
|
|
*/
|
|
void
|
|
vm_reserv_break_all(vm_object_t object)
|
|
{
|
|
vm_reserv_t rv;
|
|
int i;
|
|
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
while ((rv = LIST_FIRST(&object->rvq)) != NULL) {
|
|
KASSERT(rv->object == object,
|
|
("vm_reserv_break_all: reserv %p is corrupted", rv));
|
|
if (rv->inpartpopq) {
|
|
TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
|
|
rv->inpartpopq = FALSE;
|
|
}
|
|
LIST_REMOVE(rv, objq);
|
|
rv->object = NULL;
|
|
for (i = 0; i < VM_LEVEL_0_NPAGES; i++) {
|
|
if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
|
|
vm_phys_free_pages(&rv->pages[i], 0);
|
|
else
|
|
rv->popcnt--;
|
|
}
|
|
KASSERT(rv->popcnt == 0,
|
|
("vm_reserv_break_all: reserv %p's popcnt is corrupted",
|
|
rv));
|
|
vm_reserv_broken++;
|
|
}
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
}
|
|
|
|
/*
|
|
* Frees the given page if it belongs to a reservation. Returns TRUE if the
|
|
* page is freed and FALSE otherwise.
|
|
*
|
|
* The free page queue lock must be held.
|
|
*/
|
|
boolean_t
|
|
vm_reserv_free_page(vm_page_t m)
|
|
{
|
|
vm_reserv_t rv;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
rv = vm_reserv_from_page(m);
|
|
if (rv->object != NULL) {
|
|
vm_reserv_depopulate(rv);
|
|
return (TRUE);
|
|
}
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* Initializes the reservation management system. Specifically, initializes
|
|
* the reservation array.
|
|
*
|
|
* Requires that vm_page_array and first_page are initialized!
|
|
*/
|
|
void
|
|
vm_reserv_init(void)
|
|
{
|
|
vm_paddr_t paddr;
|
|
int i;
|
|
|
|
/*
|
|
* Initialize the reservation array. Specifically, initialize the
|
|
* "pages" field for every element that has an underlying superpage.
|
|
*/
|
|
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
|
|
paddr = roundup2(phys_avail[i], VM_LEVEL_0_SIZE);
|
|
while (paddr + VM_LEVEL_0_SIZE <= phys_avail[i + 1]) {
|
|
vm_reserv_array[paddr >> VM_LEVEL_0_SHIFT].pages =
|
|
PHYS_TO_VM_PAGE(paddr);
|
|
paddr += VM_LEVEL_0_SIZE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns a reservation level if the given page belongs to a fully-populated
|
|
* reservation and -1 otherwise.
|
|
*/
|
|
int
|
|
vm_reserv_level_iffullpop(vm_page_t m)
|
|
{
|
|
vm_reserv_t rv;
|
|
|
|
rv = vm_reserv_from_page(m);
|
|
return (rv->popcnt == VM_LEVEL_0_NPAGES ? 0 : -1);
|
|
}
|
|
|
|
/*
|
|
* Prepare for the reactivation of a cached page.
|
|
*
|
|
* First, suppose that the given page "m" was allocated individually, i.e., not
|
|
* as part of a reservation, and cached. Then, suppose a reservation
|
|
* containing "m" is allocated by the same object. Although "m" and the
|
|
* reservation belong to the same object, "m"'s pindex may not match the
|
|
* reservation's.
|
|
*
|
|
* The free page queue must be locked.
|
|
*/
|
|
boolean_t
|
|
vm_reserv_reactivate_page(vm_page_t m)
|
|
{
|
|
vm_reserv_t rv;
|
|
int i, m_index;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
rv = vm_reserv_from_page(m);
|
|
if (rv->object == NULL)
|
|
return (FALSE);
|
|
KASSERT((m->flags & PG_CACHED) != 0,
|
|
("vm_reserv_uncache_page: page %p is not cached", m));
|
|
if (m->object == rv->object &&
|
|
m->pindex - rv->pindex == VM_RESERV_INDEX(m->object, m->pindex))
|
|
vm_reserv_populate(rv);
|
|
else {
|
|
KASSERT(rv->inpartpopq,
|
|
("vm_reserv_uncache_page: reserv %p's inpartpopq is FALSE",
|
|
rv));
|
|
TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
|
|
rv->inpartpopq = FALSE;
|
|
LIST_REMOVE(rv, objq);
|
|
rv->object = NULL;
|
|
/* Don't vm_phys_free_pages(m, 0). */
|
|
m_index = m - rv->pages;
|
|
for (i = 0; i < m_index; i++) {
|
|
if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
|
|
vm_phys_free_pages(&rv->pages[i], 0);
|
|
else
|
|
rv->popcnt--;
|
|
}
|
|
for (i++; i < VM_LEVEL_0_NPAGES; i++) {
|
|
if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
|
|
vm_phys_free_pages(&rv->pages[i], 0);
|
|
else
|
|
rv->popcnt--;
|
|
}
|
|
KASSERT(rv->popcnt == 0,
|
|
("vm_reserv_uncache_page: reserv %p's popcnt is corrupted",
|
|
rv));
|
|
vm_reserv_broken++;
|
|
}
|
|
return (TRUE);
|
|
}
|
|
|
|
/*
|
|
* Breaks the given partially-populated reservation, releasing its cached and
|
|
* free pages to the physical memory allocator.
|
|
*
|
|
* The free page queue lock must be held.
|
|
*/
|
|
static void
|
|
vm_reserv_reclaim(vm_reserv_t rv)
|
|
{
|
|
int i;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
KASSERT(rv->inpartpopq,
|
|
("vm_reserv_reclaim: reserv %p's inpartpopq is corrupted", rv));
|
|
TAILQ_REMOVE(&vm_rvq_partpop, rv, partpopq);
|
|
rv->inpartpopq = FALSE;
|
|
KASSERT(rv->object != NULL,
|
|
("vm_reserv_reclaim: reserv %p is free", rv));
|
|
LIST_REMOVE(rv, objq);
|
|
rv->object = NULL;
|
|
for (i = 0; i < VM_LEVEL_0_NPAGES; i++) {
|
|
if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0)
|
|
vm_phys_free_pages(&rv->pages[i], 0);
|
|
else
|
|
rv->popcnt--;
|
|
}
|
|
KASSERT(rv->popcnt == 0,
|
|
("vm_reserv_reclaim: reserv %p's popcnt is corrupted", rv));
|
|
vm_reserv_reclaimed++;
|
|
}
|
|
|
|
/*
|
|
* Breaks the reservation at the head of the partially-populated reservation
|
|
* queue, releasing its cached and free pages to the physical memory
|
|
* allocator. Returns TRUE if a reservation is broken and FALSE otherwise.
|
|
*
|
|
* The free page queue lock must be held.
|
|
*/
|
|
boolean_t
|
|
vm_reserv_reclaim_inactive(void)
|
|
{
|
|
vm_reserv_t rv;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
if ((rv = TAILQ_FIRST(&vm_rvq_partpop)) != NULL) {
|
|
vm_reserv_reclaim(rv);
|
|
return (TRUE);
|
|
}
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* Searches the partially-populated reservation queue for the least recently
|
|
* active reservation with unused pages, i.e., cached or free, that satisfy the
|
|
* given request for contiguous physical memory. If a satisfactory reservation
|
|
* is found, it is broken. Returns TRUE if a reservation is broken and FALSE
|
|
* otherwise.
|
|
*
|
|
* The free page queue lock must be held.
|
|
*/
|
|
boolean_t
|
|
vm_reserv_reclaim_contig(vm_paddr_t size, vm_paddr_t low, vm_paddr_t high,
|
|
unsigned long alignment, unsigned long boundary)
|
|
{
|
|
vm_paddr_t pa, pa_length;
|
|
vm_reserv_t rv;
|
|
int i;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
if (size > VM_LEVEL_0_SIZE - PAGE_SIZE)
|
|
return (FALSE);
|
|
TAILQ_FOREACH(rv, &vm_rvq_partpop, partpopq) {
|
|
pa = VM_PAGE_TO_PHYS(&rv->pages[VM_LEVEL_0_NPAGES - 1]);
|
|
if (pa + PAGE_SIZE - size < low) {
|
|
/* this entire reservation is too low; go to next */
|
|
continue;
|
|
}
|
|
pa_length = 0;
|
|
for (i = 0; i < VM_LEVEL_0_NPAGES; i++)
|
|
if ((rv->pages[i].flags & (PG_CACHED | PG_FREE)) != 0) {
|
|
pa_length += PAGE_SIZE;
|
|
if (pa_length == PAGE_SIZE) {
|
|
pa = VM_PAGE_TO_PHYS(&rv->pages[i]);
|
|
if (pa + size > high) {
|
|
/* skip to next reservation */
|
|
break;
|
|
} else if (pa < low ||
|
|
(pa & (alignment - 1)) != 0 ||
|
|
((pa ^ (pa + size - 1)) &
|
|
~(boundary - 1)) != 0)
|
|
pa_length = 0;
|
|
}
|
|
if (pa_length >= size) {
|
|
vm_reserv_reclaim(rv);
|
|
return (TRUE);
|
|
}
|
|
} else
|
|
pa_length = 0;
|
|
}
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* Transfers the reservation underlying the given page to a new object.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
void
|
|
vm_reserv_rename(vm_page_t m, vm_object_t new_object, vm_object_t old_object,
|
|
vm_pindex_t old_object_offset)
|
|
{
|
|
vm_reserv_t rv;
|
|
|
|
VM_OBJECT_LOCK_ASSERT(new_object, MA_OWNED);
|
|
rv = vm_reserv_from_page(m);
|
|
if (rv->object == old_object) {
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (rv->object == old_object) {
|
|
LIST_REMOVE(rv, objq);
|
|
LIST_INSERT_HEAD(&new_object->rvq, rv, objq);
|
|
rv->object = new_object;
|
|
rv->pindex -= old_object_offset;
|
|
}
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocates the virtual and physical memory required by the reservation
|
|
* management system's data structures, in particular, the reservation array.
|
|
*/
|
|
vm_paddr_t
|
|
vm_reserv_startup(vm_offset_t *vaddr, vm_paddr_t end, vm_paddr_t high_water)
|
|
{
|
|
vm_paddr_t new_end;
|
|
size_t size;
|
|
|
|
/*
|
|
* Calculate the size (in bytes) of the reservation array. Round up
|
|
* from "high_water" because every small page is mapped to an element
|
|
* in the reservation array based on its physical address. Thus, the
|
|
* number of elements in the reservation array can be greater than the
|
|
* number of superpages.
|
|
*/
|
|
size = howmany(high_water, VM_LEVEL_0_SIZE) * sizeof(struct vm_reserv);
|
|
|
|
/*
|
|
* Allocate and map the physical memory for the reservation array. The
|
|
* next available virtual address is returned by reference.
|
|
*/
|
|
new_end = end - round_page(size);
|
|
vm_reserv_array = (void *)(uintptr_t)pmap_map(vaddr, new_end, end,
|
|
VM_PROT_READ | VM_PROT_WRITE);
|
|
bzero(vm_reserv_array, size);
|
|
|
|
/*
|
|
* Return the next available physical address.
|
|
*/
|
|
return (new_end);
|
|
}
|
|
|
|
#endif /* VM_NRESERVLEVEL > 0 */
|