4bc80a3402
Sponsored by: EMC / Isilon storage division Reviewed by: alc
3098 lines
80 KiB
C
3098 lines
80 KiB
C
/*-
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 1998 Matthew Dillon. All Rights Reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
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*/
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/*-
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* GENERAL RULES ON VM_PAGE MANIPULATION
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*
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* - A page queue lock is required when adding or removing a page from a
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* page queue (vm_pagequeues[]), regardless of other locks or the
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* busy state of a page.
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*
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* * In general, no thread besides the page daemon can acquire or
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* hold more than one page queue lock at a time.
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*
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* * The page daemon can acquire and hold any pair of page queue
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* locks in any order.
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*
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* - The object lock is required when inserting or removing
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* pages from an object (vm_page_insert() or vm_page_remove()).
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*
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*/
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/*
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* Resident memory management module.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/msgbuf.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_phys.h>
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#include <vm/vm_reserv.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <machine/md_var.h>
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/*
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* Associated with page of user-allocatable memory is a
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* page structure.
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*/
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struct vm_pagequeue vm_pagequeues[PQ_COUNT] = {
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[PQ_INACTIVE] = {
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.pq_pl = TAILQ_HEAD_INITIALIZER(
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vm_pagequeues[PQ_INACTIVE].pq_pl),
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.pq_cnt = &cnt.v_inactive_count,
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.pq_name = "vm inactive pagequeue"
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},
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[PQ_ACTIVE] = {
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.pq_pl = TAILQ_HEAD_INITIALIZER(
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vm_pagequeues[PQ_ACTIVE].pq_pl),
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.pq_cnt = &cnt.v_active_count,
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.pq_name = "vm active pagequeue"
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}
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};
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struct mtx_padalign vm_page_queue_free_mtx;
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struct mtx_padalign pa_lock[PA_LOCK_COUNT];
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vm_page_t vm_page_array;
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long vm_page_array_size;
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long first_page;
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int vm_page_zero_count;
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static int boot_pages = UMA_BOOT_PAGES;
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TUNABLE_INT("vm.boot_pages", &boot_pages);
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SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RD, &boot_pages, 0,
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"number of pages allocated for bootstrapping the VM system");
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static int pa_tryrelock_restart;
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SYSCTL_INT(_vm, OID_AUTO, tryrelock_restart, CTLFLAG_RD,
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&pa_tryrelock_restart, 0, "Number of tryrelock restarts");
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static uma_zone_t fakepg_zone;
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static struct vnode *vm_page_alloc_init(vm_page_t m);
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static void vm_page_clear_dirty_mask(vm_page_t m, vm_page_bits_t pagebits);
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static void vm_page_enqueue(int queue, vm_page_t m);
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static void vm_page_init_fakepg(void *dummy);
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SYSINIT(vm_page, SI_SUB_VM, SI_ORDER_SECOND, vm_page_init_fakepg, NULL);
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static void
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vm_page_init_fakepg(void *dummy)
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{
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fakepg_zone = uma_zcreate("fakepg", sizeof(struct vm_page), NULL, NULL,
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NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE | UMA_ZONE_VM);
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}
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/* Make sure that u_long is at least 64 bits when PAGE_SIZE is 32K. */
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#if PAGE_SIZE == 32768
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#ifdef CTASSERT
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CTASSERT(sizeof(u_long) >= 8);
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#endif
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#endif
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/*
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* Try to acquire a physical address lock while a pmap is locked. If we
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* fail to trylock we unlock and lock the pmap directly and cache the
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* locked pa in *locked. The caller should then restart their loop in case
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* the virtual to physical mapping has changed.
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*/
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int
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vm_page_pa_tryrelock(pmap_t pmap, vm_paddr_t pa, vm_paddr_t *locked)
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{
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vm_paddr_t lockpa;
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lockpa = *locked;
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*locked = pa;
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if (lockpa) {
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PA_LOCK_ASSERT(lockpa, MA_OWNED);
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if (PA_LOCKPTR(pa) == PA_LOCKPTR(lockpa))
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return (0);
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PA_UNLOCK(lockpa);
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}
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if (PA_TRYLOCK(pa))
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return (0);
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PMAP_UNLOCK(pmap);
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atomic_add_int(&pa_tryrelock_restart, 1);
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PA_LOCK(pa);
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PMAP_LOCK(pmap);
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return (EAGAIN);
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}
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/*
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* vm_set_page_size:
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*
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* Sets the page size, perhaps based upon the memory
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* size. Must be called before any use of page-size
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* dependent functions.
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*/
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void
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vm_set_page_size(void)
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{
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if (cnt.v_page_size == 0)
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cnt.v_page_size = PAGE_SIZE;
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if (((cnt.v_page_size - 1) & cnt.v_page_size) != 0)
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panic("vm_set_page_size: page size not a power of two");
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}
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/*
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* vm_page_blacklist_lookup:
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*
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* See if a physical address in this page has been listed
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* in the blacklist tunable. Entries in the tunable are
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* separated by spaces or commas. If an invalid integer is
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* encountered then the rest of the string is skipped.
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*/
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static int
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vm_page_blacklist_lookup(char *list, vm_paddr_t pa)
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{
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vm_paddr_t bad;
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char *cp, *pos;
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for (pos = list; *pos != '\0'; pos = cp) {
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bad = strtoq(pos, &cp, 0);
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if (*cp != '\0') {
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if (*cp == ' ' || *cp == ',') {
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cp++;
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if (cp == pos)
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continue;
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} else
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break;
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}
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if (pa == trunc_page(bad))
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return (1);
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}
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return (0);
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}
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/*
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* vm_page_startup:
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*
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* Initializes the resident memory module.
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*
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* Allocates memory for the page cells, and
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* for the object/offset-to-page hash table headers.
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* Each page cell is initialized and placed on the free list.
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*/
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vm_offset_t
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vm_page_startup(vm_offset_t vaddr)
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{
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vm_offset_t mapped;
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vm_paddr_t page_range;
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vm_paddr_t new_end;
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int i;
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vm_paddr_t pa;
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vm_paddr_t last_pa;
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char *list;
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/* the biggest memory array is the second group of pages */
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vm_paddr_t end;
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vm_paddr_t biggestsize;
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vm_paddr_t low_water, high_water;
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int biggestone;
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biggestsize = 0;
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biggestone = 0;
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vaddr = round_page(vaddr);
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for (i = 0; phys_avail[i + 1]; i += 2) {
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phys_avail[i] = round_page(phys_avail[i]);
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phys_avail[i + 1] = trunc_page(phys_avail[i + 1]);
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}
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low_water = phys_avail[0];
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high_water = phys_avail[1];
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for (i = 0; phys_avail[i + 1]; i += 2) {
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vm_paddr_t size = phys_avail[i + 1] - phys_avail[i];
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if (size > biggestsize) {
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biggestone = i;
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biggestsize = size;
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}
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if (phys_avail[i] < low_water)
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low_water = phys_avail[i];
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if (phys_avail[i + 1] > high_water)
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high_water = phys_avail[i + 1];
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}
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#ifdef XEN
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low_water = 0;
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#endif
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end = phys_avail[biggestone+1];
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/*
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* Initialize the page and queue locks.
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*/
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mtx_init(&vm_page_queue_free_mtx, "vm page free queue", NULL, MTX_DEF);
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for (i = 0; i < PA_LOCK_COUNT; i++)
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mtx_init(&pa_lock[i], "vm page", NULL, MTX_DEF);
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for (i = 0; i < PQ_COUNT; i++)
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vm_pagequeue_init_lock(&vm_pagequeues[i]);
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/*
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* Allocate memory for use when boot strapping the kernel memory
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* allocator.
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*/
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new_end = end - (boot_pages * UMA_SLAB_SIZE);
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new_end = trunc_page(new_end);
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mapped = pmap_map(&vaddr, new_end, end,
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VM_PROT_READ | VM_PROT_WRITE);
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bzero((void *)mapped, end - new_end);
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uma_startup((void *)mapped, boot_pages);
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#if defined(__amd64__) || defined(__i386__) || defined(__arm__) || \
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defined(__mips__)
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/*
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* Allocate a bitmap to indicate that a random physical page
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* needs to be included in a minidump.
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*
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* The amd64 port needs this to indicate which direct map pages
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* need to be dumped, via calls to dump_add_page()/dump_drop_page().
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*
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* However, i386 still needs this workspace internally within the
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* minidump code. In theory, they are not needed on i386, but are
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* included should the sf_buf code decide to use them.
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*/
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last_pa = 0;
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for (i = 0; dump_avail[i + 1] != 0; i += 2)
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if (dump_avail[i + 1] > last_pa)
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last_pa = dump_avail[i + 1];
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page_range = last_pa / PAGE_SIZE;
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vm_page_dump_size = round_page(roundup2(page_range, NBBY) / NBBY);
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new_end -= vm_page_dump_size;
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vm_page_dump = (void *)(uintptr_t)pmap_map(&vaddr, new_end,
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new_end + vm_page_dump_size, VM_PROT_READ | VM_PROT_WRITE);
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bzero((void *)vm_page_dump, vm_page_dump_size);
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#endif
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#ifdef __amd64__
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/*
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* Request that the physical pages underlying the message buffer be
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* included in a crash dump. Since the message buffer is accessed
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* through the direct map, they are not automatically included.
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*/
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pa = DMAP_TO_PHYS((vm_offset_t)msgbufp->msg_ptr);
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last_pa = pa + round_page(msgbufsize);
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while (pa < last_pa) {
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dump_add_page(pa);
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pa += PAGE_SIZE;
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}
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#endif
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/*
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* Compute the number of pages of memory that will be available for
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* use (taking into account the overhead of a page structure per
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* page).
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*/
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first_page = low_water / PAGE_SIZE;
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#ifdef VM_PHYSSEG_SPARSE
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page_range = 0;
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for (i = 0; phys_avail[i + 1] != 0; i += 2)
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page_range += atop(phys_avail[i + 1] - phys_avail[i]);
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#elif defined(VM_PHYSSEG_DENSE)
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page_range = high_water / PAGE_SIZE - first_page;
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#else
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#error "Either VM_PHYSSEG_DENSE or VM_PHYSSEG_SPARSE must be defined."
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#endif
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end = new_end;
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/*
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* Reserve an unmapped guard page to trap access to vm_page_array[-1].
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*/
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vaddr += PAGE_SIZE;
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/*
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* Initialize the mem entry structures now, and put them in the free
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* queue.
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*/
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new_end = trunc_page(end - page_range * sizeof(struct vm_page));
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mapped = pmap_map(&vaddr, new_end, end,
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VM_PROT_READ | VM_PROT_WRITE);
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vm_page_array = (vm_page_t) mapped;
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#if VM_NRESERVLEVEL > 0
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/*
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* Allocate memory for the reservation management system's data
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* structures.
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*/
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new_end = vm_reserv_startup(&vaddr, new_end, high_water);
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#endif
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#if defined(__amd64__) || defined(__mips__)
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/*
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* pmap_map on amd64 and mips can come out of the direct-map, not kvm
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* like i386, so the pages must be tracked for a crashdump to include
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* this data. This includes the vm_page_array and the early UMA
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* bootstrap pages.
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*/
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for (pa = new_end; pa < phys_avail[biggestone + 1]; pa += PAGE_SIZE)
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dump_add_page(pa);
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#endif
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phys_avail[biggestone + 1] = new_end;
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/*
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* Clear all of the page structures
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*/
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bzero((caddr_t) vm_page_array, page_range * sizeof(struct vm_page));
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for (i = 0; i < page_range; i++)
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vm_page_array[i].order = VM_NFREEORDER;
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vm_page_array_size = page_range;
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/*
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* Initialize the physical memory allocator.
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*/
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vm_phys_init();
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/*
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* Add every available physical page that is not blacklisted to
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* the free lists.
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*/
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cnt.v_page_count = 0;
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cnt.v_free_count = 0;
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list = getenv("vm.blacklist");
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for (i = 0; phys_avail[i + 1] != 0; i += 2) {
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pa = phys_avail[i];
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last_pa = phys_avail[i + 1];
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while (pa < last_pa) {
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if (list != NULL &&
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vm_page_blacklist_lookup(list, pa))
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printf("Skipping page with pa 0x%jx\n",
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(uintmax_t)pa);
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else
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vm_phys_add_page(pa);
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pa += PAGE_SIZE;
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}
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}
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freeenv(list);
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#if VM_NRESERVLEVEL > 0
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/*
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* Initialize the reservation management system.
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*/
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vm_reserv_init();
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#endif
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return (vaddr);
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}
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void
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vm_page_reference(vm_page_t m)
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{
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vm_page_aflag_set(m, PGA_REFERENCED);
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}
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void
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vm_page_busy(vm_page_t m)
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{
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VM_OBJECT_ASSERT_WLOCKED(m->object);
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KASSERT((m->oflags & VPO_BUSY) == 0,
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("vm_page_busy: page already busy!!!"));
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m->oflags |= VPO_BUSY;
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}
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/*
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* vm_page_flash:
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*
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* wakeup anyone waiting for the page.
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*/
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void
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vm_page_flash(vm_page_t m)
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{
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VM_OBJECT_ASSERT_WLOCKED(m->object);
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if (m->oflags & VPO_WANTED) {
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m->oflags &= ~VPO_WANTED;
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wakeup(m);
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}
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}
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/*
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* vm_page_wakeup:
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*
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* clear the VPO_BUSY flag and wakeup anyone waiting for the
|
|
* page.
|
|
*
|
|
*/
|
|
void
|
|
vm_page_wakeup(vm_page_t m)
|
|
{
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
KASSERT(m->oflags & VPO_BUSY, ("vm_page_wakeup: page not busy!!!"));
|
|
m->oflags &= ~VPO_BUSY;
|
|
vm_page_flash(m);
|
|
}
|
|
|
|
void
|
|
vm_page_io_start(vm_page_t m)
|
|
{
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
m->busy++;
|
|
}
|
|
|
|
void
|
|
vm_page_io_finish(vm_page_t m)
|
|
{
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
KASSERT(m->busy > 0, ("vm_page_io_finish: page %p is not busy", m));
|
|
m->busy--;
|
|
if (m->busy == 0)
|
|
vm_page_flash(m);
|
|
}
|
|
|
|
/*
|
|
* Keep page from being freed by the page daemon
|
|
* much of the same effect as wiring, except much lower
|
|
* overhead and should be used only for *very* temporary
|
|
* holding ("wiring").
|
|
*/
|
|
void
|
|
vm_page_hold(vm_page_t mem)
|
|
{
|
|
|
|
vm_page_lock_assert(mem, MA_OWNED);
|
|
mem->hold_count++;
|
|
}
|
|
|
|
void
|
|
vm_page_unhold(vm_page_t mem)
|
|
{
|
|
|
|
vm_page_lock_assert(mem, MA_OWNED);
|
|
--mem->hold_count;
|
|
KASSERT(mem->hold_count >= 0, ("vm_page_unhold: hold count < 0!!!"));
|
|
if (mem->hold_count == 0 && (mem->flags & PG_UNHOLDFREE) != 0)
|
|
vm_page_free_toq(mem);
|
|
}
|
|
|
|
/*
|
|
* vm_page_unhold_pages:
|
|
*
|
|
* Unhold each of the pages that is referenced by the given array.
|
|
*/
|
|
void
|
|
vm_page_unhold_pages(vm_page_t *ma, int count)
|
|
{
|
|
struct mtx *mtx, *new_mtx;
|
|
|
|
mtx = NULL;
|
|
for (; count != 0; count--) {
|
|
/*
|
|
* Avoid releasing and reacquiring the same page lock.
|
|
*/
|
|
new_mtx = vm_page_lockptr(*ma);
|
|
if (mtx != new_mtx) {
|
|
if (mtx != NULL)
|
|
mtx_unlock(mtx);
|
|
mtx = new_mtx;
|
|
mtx_lock(mtx);
|
|
}
|
|
vm_page_unhold(*ma);
|
|
ma++;
|
|
}
|
|
if (mtx != NULL)
|
|
mtx_unlock(mtx);
|
|
}
|
|
|
|
vm_page_t
|
|
PHYS_TO_VM_PAGE(vm_paddr_t pa)
|
|
{
|
|
vm_page_t m;
|
|
|
|
#ifdef VM_PHYSSEG_SPARSE
|
|
m = vm_phys_paddr_to_vm_page(pa);
|
|
if (m == NULL)
|
|
m = vm_phys_fictitious_to_vm_page(pa);
|
|
return (m);
|
|
#elif defined(VM_PHYSSEG_DENSE)
|
|
long pi;
|
|
|
|
pi = atop(pa);
|
|
if (pi >= first_page && (pi - first_page) < vm_page_array_size) {
|
|
m = &vm_page_array[pi - first_page];
|
|
return (m);
|
|
}
|
|
return (vm_phys_fictitious_to_vm_page(pa));
|
|
#else
|
|
#error "Either VM_PHYSSEG_DENSE or VM_PHYSSEG_SPARSE must be defined."
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* vm_page_getfake:
|
|
*
|
|
* Create a fictitious page with the specified physical address and
|
|
* memory attribute. The memory attribute is the only the machine-
|
|
* dependent aspect of a fictitious page that must be initialized.
|
|
*/
|
|
vm_page_t
|
|
vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr)
|
|
{
|
|
vm_page_t m;
|
|
|
|
m = uma_zalloc(fakepg_zone, M_WAITOK | M_ZERO);
|
|
vm_page_initfake(m, paddr, memattr);
|
|
return (m);
|
|
}
|
|
|
|
void
|
|
vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr)
|
|
{
|
|
|
|
if ((m->flags & PG_FICTITIOUS) != 0) {
|
|
/*
|
|
* The page's memattr might have changed since the
|
|
* previous initialization. Update the pmap to the
|
|
* new memattr.
|
|
*/
|
|
goto memattr;
|
|
}
|
|
m->phys_addr = paddr;
|
|
m->queue = PQ_NONE;
|
|
/* Fictitious pages don't use "segind". */
|
|
m->flags = PG_FICTITIOUS;
|
|
/* Fictitious pages don't use "order" or "pool". */
|
|
m->oflags = VPO_BUSY | VPO_UNMANAGED;
|
|
m->wire_count = 1;
|
|
memattr:
|
|
pmap_page_set_memattr(m, memattr);
|
|
}
|
|
|
|
/*
|
|
* vm_page_putfake:
|
|
*
|
|
* Release a fictitious page.
|
|
*/
|
|
void
|
|
vm_page_putfake(vm_page_t m)
|
|
{
|
|
|
|
KASSERT((m->oflags & VPO_UNMANAGED) != 0, ("managed %p", m));
|
|
KASSERT((m->flags & PG_FICTITIOUS) != 0,
|
|
("vm_page_putfake: bad page %p", m));
|
|
uma_zfree(fakepg_zone, m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_updatefake:
|
|
*
|
|
* Update the given fictitious page to the specified physical address and
|
|
* memory attribute.
|
|
*/
|
|
void
|
|
vm_page_updatefake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr)
|
|
{
|
|
|
|
KASSERT((m->flags & PG_FICTITIOUS) != 0,
|
|
("vm_page_updatefake: bad page %p", m));
|
|
m->phys_addr = paddr;
|
|
pmap_page_set_memattr(m, memattr);
|
|
}
|
|
|
|
/*
|
|
* vm_page_free:
|
|
*
|
|
* Free a page.
|
|
*/
|
|
void
|
|
vm_page_free(vm_page_t m)
|
|
{
|
|
|
|
m->flags &= ~PG_ZERO;
|
|
vm_page_free_toq(m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_free_zero:
|
|
*
|
|
* Free a page to the zerod-pages queue
|
|
*/
|
|
void
|
|
vm_page_free_zero(vm_page_t m)
|
|
{
|
|
|
|
m->flags |= PG_ZERO;
|
|
vm_page_free_toq(m);
|
|
}
|
|
|
|
/*
|
|
* Unbusy and handle the page queueing for a page from the VOP_GETPAGES()
|
|
* array which is not the request page.
|
|
*/
|
|
void
|
|
vm_page_readahead_finish(vm_page_t m)
|
|
{
|
|
|
|
if (m->valid != 0) {
|
|
/*
|
|
* Since the page is not the requested page, whether
|
|
* it should be activated or deactivated is not
|
|
* obvious. Empirical results have shown that
|
|
* deactivating the page is usually the best choice,
|
|
* unless the page is wanted by another thread.
|
|
*/
|
|
if (m->oflags & VPO_WANTED) {
|
|
vm_page_lock(m);
|
|
vm_page_activate(m);
|
|
vm_page_unlock(m);
|
|
} else {
|
|
vm_page_lock(m);
|
|
vm_page_deactivate(m);
|
|
vm_page_unlock(m);
|
|
}
|
|
vm_page_wakeup(m);
|
|
} else {
|
|
/*
|
|
* Free the completely invalid page. Such page state
|
|
* occurs due to the short read operation which did
|
|
* not covered our page at all, or in case when a read
|
|
* error happens.
|
|
*/
|
|
vm_page_lock(m);
|
|
vm_page_free(m);
|
|
vm_page_unlock(m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_sleep:
|
|
*
|
|
* Sleep and release the page lock.
|
|
*
|
|
* The object containing the given page must be locked.
|
|
*/
|
|
void
|
|
vm_page_sleep(vm_page_t m, const char *msg)
|
|
{
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if (mtx_owned(vm_page_lockptr(m)))
|
|
vm_page_unlock(m);
|
|
|
|
/*
|
|
* It's possible that while we sleep, the page will get
|
|
* unbusied and freed. If we are holding the object
|
|
* lock, we will assume we hold a reference to the object
|
|
* such that even if m->object changes, we can re-lock
|
|
* it.
|
|
*/
|
|
m->oflags |= VPO_WANTED;
|
|
VM_OBJECT_SLEEP(m->object, m, PVM, msg, 0);
|
|
}
|
|
|
|
/*
|
|
* vm_page_dirty_KBI: [ internal use only ]
|
|
*
|
|
* Set all bits in the page's dirty field.
|
|
*
|
|
* The object containing the specified page must be locked if the
|
|
* call is made from the machine-independent layer.
|
|
*
|
|
* See vm_page_clear_dirty_mask().
|
|
*
|
|
* This function should only be called by vm_page_dirty().
|
|
*/
|
|
void
|
|
vm_page_dirty_KBI(vm_page_t m)
|
|
{
|
|
|
|
/* These assertions refer to this operation by its public name. */
|
|
KASSERT((m->flags & PG_CACHED) == 0,
|
|
("vm_page_dirty: page in cache!"));
|
|
KASSERT(!VM_PAGE_IS_FREE(m),
|
|
("vm_page_dirty: page is free!"));
|
|
KASSERT(m->valid == VM_PAGE_BITS_ALL,
|
|
("vm_page_dirty: page is invalid!"));
|
|
m->dirty = VM_PAGE_BITS_ALL;
|
|
}
|
|
|
|
/*
|
|
* vm_page_splay:
|
|
*
|
|
* Implements Sleator and Tarjan's top-down splay algorithm. Returns
|
|
* the vm_page containing the given pindex. If, however, that
|
|
* pindex is not found in the vm_object, returns a vm_page that is
|
|
* adjacent to the pindex, coming before or after it.
|
|
*/
|
|
vm_page_t
|
|
vm_page_splay(vm_pindex_t pindex, vm_page_t root)
|
|
{
|
|
struct vm_page dummy;
|
|
vm_page_t lefttreemax, righttreemin, y;
|
|
|
|
if (root == NULL)
|
|
return (root);
|
|
lefttreemax = righttreemin = &dummy;
|
|
for (;; root = y) {
|
|
if (pindex < root->pindex) {
|
|
if ((y = root->left) == NULL)
|
|
break;
|
|
if (pindex < y->pindex) {
|
|
/* Rotate right. */
|
|
root->left = y->right;
|
|
y->right = root;
|
|
root = y;
|
|
if ((y = root->left) == NULL)
|
|
break;
|
|
}
|
|
/* Link into the new root's right tree. */
|
|
righttreemin->left = root;
|
|
righttreemin = root;
|
|
} else if (pindex > root->pindex) {
|
|
if ((y = root->right) == NULL)
|
|
break;
|
|
if (pindex > y->pindex) {
|
|
/* Rotate left. */
|
|
root->right = y->left;
|
|
y->left = root;
|
|
root = y;
|
|
if ((y = root->right) == NULL)
|
|
break;
|
|
}
|
|
/* Link into the new root's left tree. */
|
|
lefttreemax->right = root;
|
|
lefttreemax = root;
|
|
} else
|
|
break;
|
|
}
|
|
/* Assemble the new root. */
|
|
lefttreemax->right = root->left;
|
|
righttreemin->left = root->right;
|
|
root->left = dummy.right;
|
|
root->right = dummy.left;
|
|
return (root);
|
|
}
|
|
|
|
/*
|
|
* vm_page_insert: [ internal use only ]
|
|
*
|
|
* Inserts the given mem entry into the object and object list.
|
|
*
|
|
* The pagetables are not updated but will presumably fault the page
|
|
* in if necessary, or if a kernel page the caller will at some point
|
|
* enter the page into the kernel's pmap. We are not allowed to sleep
|
|
* here so we *can't* do this anyway.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
void
|
|
vm_page_insert(vm_page_t m, vm_object_t object, vm_pindex_t pindex)
|
|
{
|
|
vm_page_t root;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
if (m->object != NULL)
|
|
panic("vm_page_insert: page already inserted");
|
|
|
|
/*
|
|
* Record the object/offset pair in this page
|
|
*/
|
|
m->object = object;
|
|
m->pindex = pindex;
|
|
|
|
/*
|
|
* Now link into the object's ordered list of backed pages.
|
|
*/
|
|
root = object->root;
|
|
if (root == NULL) {
|
|
m->left = NULL;
|
|
m->right = NULL;
|
|
TAILQ_INSERT_TAIL(&object->memq, m, listq);
|
|
} else {
|
|
root = vm_page_splay(pindex, root);
|
|
if (pindex < root->pindex) {
|
|
m->left = root->left;
|
|
m->right = root;
|
|
root->left = NULL;
|
|
TAILQ_INSERT_BEFORE(root, m, listq);
|
|
} else if (pindex == root->pindex)
|
|
panic("vm_page_insert: offset already allocated");
|
|
else {
|
|
m->right = root->right;
|
|
m->left = root;
|
|
root->right = NULL;
|
|
TAILQ_INSERT_AFTER(&object->memq, root, m, listq);
|
|
}
|
|
}
|
|
object->root = m;
|
|
|
|
/*
|
|
* Show that the object has one more resident page.
|
|
*/
|
|
object->resident_page_count++;
|
|
|
|
/*
|
|
* Hold the vnode until the last page is released.
|
|
*/
|
|
if (object->resident_page_count == 1 && object->type == OBJT_VNODE)
|
|
vhold(object->handle);
|
|
|
|
/*
|
|
* Since we are inserting a new and possibly dirty page,
|
|
* update the object's OBJ_MIGHTBEDIRTY flag.
|
|
*/
|
|
if (pmap_page_is_write_mapped(m))
|
|
vm_object_set_writeable_dirty(object);
|
|
}
|
|
|
|
/*
|
|
* vm_page_remove:
|
|
*
|
|
* Removes the given mem entry from the object/offset-page
|
|
* table and the object page list, but do not invalidate/terminate
|
|
* the backing store.
|
|
*
|
|
* The underlying pmap entry (if any) is NOT removed here.
|
|
*
|
|
* The object must be locked. The page must be locked if it is managed.
|
|
*/
|
|
void
|
|
vm_page_remove(vm_page_t m)
|
|
{
|
|
vm_object_t object;
|
|
vm_page_t next, prev, root;
|
|
|
|
if ((m->oflags & VPO_UNMANAGED) == 0)
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
if ((object = m->object) == NULL)
|
|
return;
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
if (m->oflags & VPO_BUSY) {
|
|
m->oflags &= ~VPO_BUSY;
|
|
vm_page_flash(m);
|
|
}
|
|
|
|
/*
|
|
* Now remove from the object's list of backed pages.
|
|
*/
|
|
if ((next = TAILQ_NEXT(m, listq)) != NULL && next->left == m) {
|
|
/*
|
|
* Since the page's successor in the list is also its parent
|
|
* in the tree, its right subtree must be empty.
|
|
*/
|
|
next->left = m->left;
|
|
KASSERT(m->right == NULL,
|
|
("vm_page_remove: page %p has right child", m));
|
|
} else if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL &&
|
|
prev->right == m) {
|
|
/*
|
|
* Since the page's predecessor in the list is also its parent
|
|
* in the tree, its left subtree must be empty.
|
|
*/
|
|
KASSERT(m->left == NULL,
|
|
("vm_page_remove: page %p has left child", m));
|
|
prev->right = m->right;
|
|
} else {
|
|
if (m != object->root)
|
|
vm_page_splay(m->pindex, object->root);
|
|
if (m->left == NULL)
|
|
root = m->right;
|
|
else if (m->right == NULL)
|
|
root = m->left;
|
|
else {
|
|
/*
|
|
* Move the page's successor to the root, because
|
|
* pages are usually removed in ascending order.
|
|
*/
|
|
if (m->right != next)
|
|
vm_page_splay(m->pindex, m->right);
|
|
next->left = m->left;
|
|
root = next;
|
|
}
|
|
object->root = root;
|
|
}
|
|
TAILQ_REMOVE(&object->memq, m, listq);
|
|
|
|
/*
|
|
* And show that the object has one fewer resident page.
|
|
*/
|
|
object->resident_page_count--;
|
|
|
|
/*
|
|
* The vnode may now be recycled.
|
|
*/
|
|
if (object->resident_page_count == 0 && object->type == OBJT_VNODE)
|
|
vdrop(object->handle);
|
|
|
|
m->object = NULL;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
vm_page_t
|
|
vm_page_lookup(vm_object_t object, vm_pindex_t pindex)
|
|
{
|
|
vm_page_t m;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
if ((m = object->root) != NULL && m->pindex != pindex) {
|
|
m = vm_page_splay(pindex, m);
|
|
if ((object->root = m)->pindex != pindex)
|
|
m = NULL;
|
|
}
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_find_least:
|
|
*
|
|
* Returns the page associated with the object with least pindex
|
|
* greater than or equal to the parameter pindex, or NULL.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
vm_page_t
|
|
vm_page_find_least(vm_object_t object, vm_pindex_t pindex)
|
|
{
|
|
vm_page_t m;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
if ((m = TAILQ_FIRST(&object->memq)) != NULL) {
|
|
if (m->pindex < pindex) {
|
|
m = vm_page_splay(pindex, object->root);
|
|
if ((object->root = m)->pindex < pindex)
|
|
m = TAILQ_NEXT(m, listq);
|
|
}
|
|
}
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Returns the given page's successor (by pindex) within the object if it is
|
|
* resident; if none is found, NULL is returned.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
vm_page_t
|
|
vm_page_next(vm_page_t m)
|
|
{
|
|
vm_page_t next;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if ((next = TAILQ_NEXT(m, listq)) != NULL &&
|
|
next->pindex != m->pindex + 1)
|
|
next = NULL;
|
|
return (next);
|
|
}
|
|
|
|
/*
|
|
* Returns the given page's predecessor (by pindex) within the object if it is
|
|
* resident; if none is found, NULL is returned.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
vm_page_t
|
|
vm_page_prev(vm_page_t m)
|
|
{
|
|
vm_page_t prev;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL &&
|
|
prev->pindex != m->pindex - 1)
|
|
prev = NULL;
|
|
return (prev);
|
|
}
|
|
|
|
/*
|
|
* vm_page_rename:
|
|
*
|
|
* Move the given memory entry from its
|
|
* current object to the specified target object/offset.
|
|
*
|
|
* Note: swap associated with the page must be invalidated by the move. We
|
|
* have to do this for several reasons: (1) we aren't freeing the
|
|
* page, (2) we are dirtying the page, (3) the VM system is probably
|
|
* moving the page from object A to B, and will then later move
|
|
* the backing store from A to B and we can't have a conflict.
|
|
*
|
|
* Note: we *always* dirty the page. It is necessary both for the
|
|
* fact that we moved it, and because we may be invalidating
|
|
* swap. If the page is on the cache, we have to deactivate it
|
|
* or vm_page_dirty() will panic. Dirty pages are not allowed
|
|
* on the cache.
|
|
*
|
|
* The objects must be locked. The page must be locked if it is managed.
|
|
*/
|
|
void
|
|
vm_page_rename(vm_page_t m, vm_object_t new_object, vm_pindex_t new_pindex)
|
|
{
|
|
|
|
vm_page_remove(m);
|
|
vm_page_insert(m, new_object, new_pindex);
|
|
vm_page_dirty(m);
|
|
}
|
|
|
|
/*
|
|
* Convert all of the given object's cached pages that have a
|
|
* pindex within the given range into free pages. If the value
|
|
* zero is given for "end", then the range's upper bound is
|
|
* infinity. If the given object is backed by a vnode and it
|
|
* transitions from having one or more cached pages to none, the
|
|
* vnode's hold count is reduced.
|
|
*/
|
|
void
|
|
vm_page_cache_free(vm_object_t object, vm_pindex_t start, vm_pindex_t end)
|
|
{
|
|
vm_page_t m, m_next;
|
|
boolean_t empty;
|
|
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (__predict_false(vm_object_cache_is_empty(object))) {
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
return;
|
|
}
|
|
m = object->cache = vm_page_splay(start, object->cache);
|
|
if (m->pindex < start) {
|
|
if (m->right == NULL)
|
|
m = NULL;
|
|
else {
|
|
m_next = vm_page_splay(start, m->right);
|
|
m_next->left = m;
|
|
m->right = NULL;
|
|
m = object->cache = m_next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* At this point, "m" is either (1) a reference to the page
|
|
* with the least pindex that is greater than or equal to
|
|
* "start" or (2) NULL.
|
|
*/
|
|
for (; m != NULL && (m->pindex < end || end == 0); m = m_next) {
|
|
/*
|
|
* Find "m"'s successor and remove "m" from the
|
|
* object's cache.
|
|
*/
|
|
if (m->right == NULL) {
|
|
object->cache = m->left;
|
|
m_next = NULL;
|
|
} else {
|
|
m_next = vm_page_splay(start, m->right);
|
|
m_next->left = m->left;
|
|
object->cache = m_next;
|
|
}
|
|
/* Convert "m" to a free page. */
|
|
m->object = NULL;
|
|
m->valid = 0;
|
|
/* Clear PG_CACHED and set PG_FREE. */
|
|
m->flags ^= PG_CACHED | PG_FREE;
|
|
KASSERT((m->flags & (PG_CACHED | PG_FREE)) == PG_FREE,
|
|
("vm_page_cache_free: page %p has inconsistent flags", m));
|
|
cnt.v_cache_count--;
|
|
cnt.v_free_count++;
|
|
}
|
|
empty = vm_object_cache_is_empty(object);
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
if (object->type == OBJT_VNODE && empty)
|
|
vdrop(object->handle);
|
|
}
|
|
|
|
/*
|
|
* Returns the cached page that is associated with the given
|
|
* object and offset. If, however, none exists, returns NULL.
|
|
*
|
|
* The free page queue must be locked.
|
|
*/
|
|
static inline vm_page_t
|
|
vm_page_cache_lookup(vm_object_t object, vm_pindex_t pindex)
|
|
{
|
|
vm_page_t m;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
if ((m = object->cache) != NULL && m->pindex != pindex) {
|
|
m = vm_page_splay(pindex, m);
|
|
if ((object->cache = m)->pindex != pindex)
|
|
m = NULL;
|
|
}
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Remove the given cached page from its containing object's
|
|
* collection of cached pages.
|
|
*
|
|
* The free page queue must be locked.
|
|
*/
|
|
static void
|
|
vm_page_cache_remove(vm_page_t m)
|
|
{
|
|
vm_object_t object;
|
|
vm_page_t root;
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
KASSERT((m->flags & PG_CACHED) != 0,
|
|
("vm_page_cache_remove: page %p is not cached", m));
|
|
object = m->object;
|
|
if (m != object->cache) {
|
|
root = vm_page_splay(m->pindex, object->cache);
|
|
KASSERT(root == m,
|
|
("vm_page_cache_remove: page %p is not cached in object %p",
|
|
m, object));
|
|
}
|
|
if (m->left == NULL)
|
|
root = m->right;
|
|
else if (m->right == NULL)
|
|
root = m->left;
|
|
else {
|
|
root = vm_page_splay(m->pindex, m->left);
|
|
root->right = m->right;
|
|
}
|
|
object->cache = root;
|
|
m->object = NULL;
|
|
cnt.v_cache_count--;
|
|
}
|
|
|
|
/*
|
|
* Transfer all of the cached pages with offset greater than or
|
|
* equal to 'offidxstart' from the original object's cache to the
|
|
* new object's cache. However, any cached pages with offset
|
|
* greater than or equal to the new object's size are kept in the
|
|
* original object. Initially, the new object's cache must be
|
|
* empty. Offset 'offidxstart' in the original object must
|
|
* correspond to offset zero in the new object.
|
|
*
|
|
* The new object must be locked.
|
|
*/
|
|
void
|
|
vm_page_cache_transfer(vm_object_t orig_object, vm_pindex_t offidxstart,
|
|
vm_object_t new_object)
|
|
{
|
|
vm_page_t m, m_next;
|
|
|
|
/*
|
|
* Insertion into an object's collection of cached pages
|
|
* requires the object to be locked. In contrast, removal does
|
|
* not.
|
|
*/
|
|
VM_OBJECT_ASSERT_WLOCKED(new_object);
|
|
KASSERT(vm_object_cache_is_empty(new_object),
|
|
("vm_page_cache_transfer: object %p has cached pages",
|
|
new_object));
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if ((m = orig_object->cache) != NULL) {
|
|
/*
|
|
* Transfer all of the pages with offset greater than or
|
|
* equal to 'offidxstart' from the original object's
|
|
* cache to the new object's cache.
|
|
*/
|
|
m = vm_page_splay(offidxstart, m);
|
|
if (m->pindex < offidxstart) {
|
|
orig_object->cache = m;
|
|
new_object->cache = m->right;
|
|
m->right = NULL;
|
|
} else {
|
|
orig_object->cache = m->left;
|
|
new_object->cache = m;
|
|
m->left = NULL;
|
|
}
|
|
while ((m = new_object->cache) != NULL) {
|
|
if ((m->pindex - offidxstart) >= new_object->size) {
|
|
/*
|
|
* Return all of the cached pages with
|
|
* offset greater than or equal to the
|
|
* new object's size to the original
|
|
* object's cache.
|
|
*/
|
|
new_object->cache = m->left;
|
|
m->left = orig_object->cache;
|
|
orig_object->cache = m;
|
|
break;
|
|
}
|
|
m_next = vm_page_splay(m->pindex, m->right);
|
|
/* Update the page's object and offset. */
|
|
m->object = new_object;
|
|
m->pindex -= offidxstart;
|
|
if (m_next == NULL)
|
|
break;
|
|
m->right = NULL;
|
|
m_next->left = m;
|
|
new_object->cache = m_next;
|
|
}
|
|
KASSERT(vm_object_cache_is_empty(new_object) ||
|
|
new_object->type == OBJT_SWAP,
|
|
("vm_page_cache_transfer: object %p's type is incompatible"
|
|
" with cached pages", new_object));
|
|
}
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
}
|
|
|
|
/*
|
|
* Returns TRUE if a cached page is associated with the given object and
|
|
* offset, and FALSE otherwise.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
boolean_t
|
|
vm_page_is_cached(vm_object_t object, vm_pindex_t pindex)
|
|
{
|
|
vm_page_t m;
|
|
|
|
/*
|
|
* Insertion into an object's collection of cached pages requires the
|
|
* object to be locked. Therefore, if the object is locked and the
|
|
* object's collection is empty, there is no need to acquire the free
|
|
* page queues lock in order to prove that the specified page doesn't
|
|
* exist.
|
|
*/
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
if (__predict_true(vm_object_cache_is_empty(object)))
|
|
return (FALSE);
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
m = vm_page_cache_lookup(object, pindex);
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
return (m != NULL);
|
|
}
|
|
|
|
/*
|
|
* vm_page_alloc:
|
|
*
|
|
* Allocate and return a page that is associated with the specified
|
|
* object and offset pair. By default, this page has the flag VPO_BUSY
|
|
* set.
|
|
*
|
|
* The caller must always specify an allocation class.
|
|
*
|
|
* allocation classes:
|
|
* VM_ALLOC_NORMAL normal process request
|
|
* VM_ALLOC_SYSTEM system *really* needs a page
|
|
* VM_ALLOC_INTERRUPT interrupt time request
|
|
*
|
|
* optional allocation flags:
|
|
* VM_ALLOC_COUNT(number) the number of additional pages that the caller
|
|
* intends to allocate
|
|
* VM_ALLOC_IFCACHED return page only if it is cached
|
|
* VM_ALLOC_IFNOTCACHED return NULL, do not reactivate if the page
|
|
* is cached
|
|
* VM_ALLOC_NOBUSY do not set the flag VPO_BUSY on the page
|
|
* VM_ALLOC_NODUMP do not include the page in a kernel core dump
|
|
* VM_ALLOC_NOOBJ page is not associated with an object and
|
|
* should not have the flag VPO_BUSY set
|
|
* VM_ALLOC_WIRED wire the allocated page
|
|
* VM_ALLOC_ZERO prefer a zeroed page
|
|
*
|
|
* This routine may not sleep.
|
|
*/
|
|
vm_page_t
|
|
vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int req)
|
|
{
|
|
struct vnode *vp = NULL;
|
|
vm_object_t m_object;
|
|
vm_page_t m;
|
|
int flags, req_class;
|
|
|
|
KASSERT((object != NULL) == ((req & VM_ALLOC_NOOBJ) == 0),
|
|
("vm_page_alloc: inconsistent object/req"));
|
|
if (object != NULL)
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
|
|
req_class = req & VM_ALLOC_CLASS_MASK;
|
|
|
|
/*
|
|
* The page daemon is allowed to dig deeper into the free page list.
|
|
*/
|
|
if (curproc == pageproc && req_class != VM_ALLOC_INTERRUPT)
|
|
req_class = VM_ALLOC_SYSTEM;
|
|
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (cnt.v_free_count + cnt.v_cache_count > cnt.v_free_reserved ||
|
|
(req_class == VM_ALLOC_SYSTEM &&
|
|
cnt.v_free_count + cnt.v_cache_count > cnt.v_interrupt_free_min) ||
|
|
(req_class == VM_ALLOC_INTERRUPT &&
|
|
cnt.v_free_count + cnt.v_cache_count > 0)) {
|
|
/*
|
|
* Allocate from the free queue if the number of free pages
|
|
* exceeds the minimum for the request class.
|
|
*/
|
|
if (object != NULL &&
|
|
(m = vm_page_cache_lookup(object, pindex)) != NULL) {
|
|
if ((req & VM_ALLOC_IFNOTCACHED) != 0) {
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
return (NULL);
|
|
}
|
|
if (vm_phys_unfree_page(m))
|
|
vm_phys_set_pool(VM_FREEPOOL_DEFAULT, m, 0);
|
|
#if VM_NRESERVLEVEL > 0
|
|
else if (!vm_reserv_reactivate_page(m))
|
|
#else
|
|
else
|
|
#endif
|
|
panic("vm_page_alloc: cache page %p is missing"
|
|
" from the free queue", m);
|
|
} else if ((req & VM_ALLOC_IFCACHED) != 0) {
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
return (NULL);
|
|
#if VM_NRESERVLEVEL > 0
|
|
} else if (object == NULL || (object->flags & (OBJ_COLORED |
|
|
OBJ_FICTITIOUS)) != OBJ_COLORED ||
|
|
(m = vm_reserv_alloc_page(object, pindex)) == NULL) {
|
|
#else
|
|
} else {
|
|
#endif
|
|
m = vm_phys_alloc_pages(object != NULL ?
|
|
VM_FREEPOOL_DEFAULT : VM_FREEPOOL_DIRECT, 0);
|
|
#if VM_NRESERVLEVEL > 0
|
|
if (m == NULL && vm_reserv_reclaim_inactive()) {
|
|
m = vm_phys_alloc_pages(object != NULL ?
|
|
VM_FREEPOOL_DEFAULT : VM_FREEPOOL_DIRECT,
|
|
0);
|
|
}
|
|
#endif
|
|
}
|
|
} else {
|
|
/*
|
|
* Not allocatable, give up.
|
|
*/
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
atomic_add_int(&vm_pageout_deficit,
|
|
max((u_int)req >> VM_ALLOC_COUNT_SHIFT, 1));
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* At this point we had better have found a good page.
|
|
*/
|
|
KASSERT(m != NULL, ("vm_page_alloc: missing page"));
|
|
KASSERT(m->queue == PQ_NONE,
|
|
("vm_page_alloc: page %p has unexpected queue %d", m, m->queue));
|
|
KASSERT(m->wire_count == 0, ("vm_page_alloc: page %p is wired", m));
|
|
KASSERT(m->hold_count == 0, ("vm_page_alloc: page %p is held", m));
|
|
KASSERT(m->busy == 0, ("vm_page_alloc: page %p is busy", m));
|
|
KASSERT(m->dirty == 0, ("vm_page_alloc: page %p is dirty", m));
|
|
KASSERT(pmap_page_get_memattr(m) == VM_MEMATTR_DEFAULT,
|
|
("vm_page_alloc: page %p has unexpected memattr %d", m,
|
|
pmap_page_get_memattr(m)));
|
|
if ((m->flags & PG_CACHED) != 0) {
|
|
KASSERT((m->flags & PG_ZERO) == 0,
|
|
("vm_page_alloc: cached page %p is PG_ZERO", m));
|
|
KASSERT(m->valid != 0,
|
|
("vm_page_alloc: cached page %p is invalid", m));
|
|
if (m->object == object && m->pindex == pindex)
|
|
cnt.v_reactivated++;
|
|
else
|
|
m->valid = 0;
|
|
m_object = m->object;
|
|
vm_page_cache_remove(m);
|
|
if (m_object->type == OBJT_VNODE &&
|
|
vm_object_cache_is_empty(m_object))
|
|
vp = m_object->handle;
|
|
} else {
|
|
KASSERT(VM_PAGE_IS_FREE(m),
|
|
("vm_page_alloc: page %p is not free", m));
|
|
KASSERT(m->valid == 0,
|
|
("vm_page_alloc: free page %p is valid", m));
|
|
cnt.v_free_count--;
|
|
}
|
|
|
|
/*
|
|
* Only the PG_ZERO flag is inherited. The PG_CACHED or PG_FREE flag
|
|
* must be cleared before the free page queues lock is released.
|
|
*/
|
|
flags = 0;
|
|
if (m->flags & PG_ZERO) {
|
|
vm_page_zero_count--;
|
|
if (req & VM_ALLOC_ZERO)
|
|
flags = PG_ZERO;
|
|
}
|
|
if (req & VM_ALLOC_NODUMP)
|
|
flags |= PG_NODUMP;
|
|
m->flags = flags;
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
m->aflags = 0;
|
|
m->oflags = object == NULL || (object->flags & OBJ_UNMANAGED) != 0 ?
|
|
VPO_UNMANAGED : 0;
|
|
if ((req & (VM_ALLOC_NOBUSY | VM_ALLOC_NOOBJ)) == 0)
|
|
m->oflags |= VPO_BUSY;
|
|
if (req & VM_ALLOC_WIRED) {
|
|
/*
|
|
* The page lock is not required for wiring a page until that
|
|
* page is inserted into the object.
|
|
*/
|
|
atomic_add_int(&cnt.v_wire_count, 1);
|
|
m->wire_count = 1;
|
|
}
|
|
m->act_count = 0;
|
|
|
|
if (object != NULL) {
|
|
/* Ignore device objects; the pager sets "memattr" for them. */
|
|
if (object->memattr != VM_MEMATTR_DEFAULT &&
|
|
(object->flags & OBJ_FICTITIOUS) == 0)
|
|
pmap_page_set_memattr(m, object->memattr);
|
|
vm_page_insert(m, object, pindex);
|
|
} else
|
|
m->pindex = pindex;
|
|
|
|
/*
|
|
* The following call to vdrop() must come after the above call
|
|
* to vm_page_insert() in case both affect the same object and
|
|
* vnode. Otherwise, the affected vnode's hold count could
|
|
* temporarily become zero.
|
|
*/
|
|
if (vp != NULL)
|
|
vdrop(vp);
|
|
|
|
/*
|
|
* Don't wakeup too often - wakeup the pageout daemon when
|
|
* we would be nearly out of memory.
|
|
*/
|
|
if (vm_paging_needed())
|
|
pagedaemon_wakeup();
|
|
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_alloc_contig:
|
|
*
|
|
* 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.
|
|
*
|
|
* If the specified memory attribute, "memattr", is VM_MEMATTR_DEFAULT,
|
|
* then the memory attribute setting for the physical pages is configured
|
|
* to the object's memory attribute setting. Otherwise, the memory
|
|
* attribute setting for the physical pages is configured to "memattr",
|
|
* overriding the object's memory attribute setting. However, if the
|
|
* object's memory attribute setting is not VM_MEMATTR_DEFAULT, then the
|
|
* memory attribute setting for the physical pages cannot be configured
|
|
* to VM_MEMATTR_DEFAULT.
|
|
*
|
|
* The caller must always specify an allocation class.
|
|
*
|
|
* allocation classes:
|
|
* VM_ALLOC_NORMAL normal process request
|
|
* VM_ALLOC_SYSTEM system *really* needs a page
|
|
* VM_ALLOC_INTERRUPT interrupt time request
|
|
*
|
|
* optional allocation flags:
|
|
* VM_ALLOC_NOBUSY do not set the flag VPO_BUSY on the page
|
|
* VM_ALLOC_NOOBJ page is not associated with an object and
|
|
* should not have the flag VPO_BUSY set
|
|
* VM_ALLOC_WIRED wire the allocated page
|
|
* VM_ALLOC_ZERO prefer a zeroed page
|
|
*
|
|
* This routine may not sleep.
|
|
*/
|
|
vm_page_t
|
|
vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req,
|
|
u_long npages, vm_paddr_t low, vm_paddr_t high, u_long alignment,
|
|
vm_paddr_t boundary, vm_memattr_t memattr)
|
|
{
|
|
struct vnode *drop;
|
|
vm_page_t deferred_vdrop_list, m, m_ret;
|
|
u_int flags, oflags;
|
|
int req_class;
|
|
|
|
KASSERT((object != NULL) == ((req & VM_ALLOC_NOOBJ) == 0),
|
|
("vm_page_alloc_contig: inconsistent object/req"));
|
|
if (object != NULL) {
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
KASSERT(object->type == OBJT_PHYS,
|
|
("vm_page_alloc_contig: object %p isn't OBJT_PHYS",
|
|
object));
|
|
}
|
|
KASSERT(npages > 0, ("vm_page_alloc_contig: npages is zero"));
|
|
req_class = req & VM_ALLOC_CLASS_MASK;
|
|
|
|
/*
|
|
* The page daemon is allowed to dig deeper into the free page list.
|
|
*/
|
|
if (curproc == pageproc && req_class != VM_ALLOC_INTERRUPT)
|
|
req_class = VM_ALLOC_SYSTEM;
|
|
|
|
deferred_vdrop_list = NULL;
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (cnt.v_free_count + cnt.v_cache_count >= npages +
|
|
cnt.v_free_reserved || (req_class == VM_ALLOC_SYSTEM &&
|
|
cnt.v_free_count + cnt.v_cache_count >= npages +
|
|
cnt.v_interrupt_free_min) || (req_class == VM_ALLOC_INTERRUPT &&
|
|
cnt.v_free_count + cnt.v_cache_count >= npages)) {
|
|
#if VM_NRESERVLEVEL > 0
|
|
retry:
|
|
if (object == NULL || (object->flags & OBJ_COLORED) == 0 ||
|
|
(m_ret = vm_reserv_alloc_contig(object, pindex, npages,
|
|
low, high, alignment, boundary)) == NULL)
|
|
#endif
|
|
m_ret = vm_phys_alloc_contig(npages, low, high,
|
|
alignment, boundary);
|
|
} else {
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
atomic_add_int(&vm_pageout_deficit, npages);
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
if (m_ret != NULL)
|
|
for (m = m_ret; m < &m_ret[npages]; m++) {
|
|
drop = vm_page_alloc_init(m);
|
|
if (drop != NULL) {
|
|
/*
|
|
* Enqueue the vnode for deferred vdrop().
|
|
*
|
|
* Once the pages are removed from the free
|
|
* page list, "pageq" can be safely abused to
|
|
* construct a short-lived list of vnodes.
|
|
*/
|
|
m->pageq.tqe_prev = (void *)drop;
|
|
m->pageq.tqe_next = deferred_vdrop_list;
|
|
deferred_vdrop_list = m;
|
|
}
|
|
}
|
|
else {
|
|
#if VM_NRESERVLEVEL > 0
|
|
if (vm_reserv_reclaim_contig(npages, low, high, alignment,
|
|
boundary))
|
|
goto retry;
|
|
#endif
|
|
}
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
if (m_ret == NULL)
|
|
return (NULL);
|
|
|
|
/*
|
|
* Initialize the pages. Only the PG_ZERO flag is inherited.
|
|
*/
|
|
flags = 0;
|
|
if ((req & VM_ALLOC_ZERO) != 0)
|
|
flags = PG_ZERO;
|
|
if ((req & VM_ALLOC_NODUMP) != 0)
|
|
flags |= PG_NODUMP;
|
|
if ((req & VM_ALLOC_WIRED) != 0)
|
|
atomic_add_int(&cnt.v_wire_count, npages);
|
|
oflags = VPO_UNMANAGED;
|
|
if (object != NULL) {
|
|
if ((req & VM_ALLOC_NOBUSY) == 0)
|
|
oflags |= VPO_BUSY;
|
|
if (object->memattr != VM_MEMATTR_DEFAULT &&
|
|
memattr == VM_MEMATTR_DEFAULT)
|
|
memattr = object->memattr;
|
|
}
|
|
for (m = m_ret; m < &m_ret[npages]; m++) {
|
|
m->aflags = 0;
|
|
m->flags = (m->flags | PG_NODUMP) & flags;
|
|
if ((req & VM_ALLOC_WIRED) != 0)
|
|
m->wire_count = 1;
|
|
/* Unmanaged pages don't use "act_count". */
|
|
m->oflags = oflags;
|
|
if (memattr != VM_MEMATTR_DEFAULT)
|
|
pmap_page_set_memattr(m, memattr);
|
|
if (object != NULL)
|
|
vm_page_insert(m, object, pindex);
|
|
else
|
|
m->pindex = pindex;
|
|
pindex++;
|
|
}
|
|
while (deferred_vdrop_list != NULL) {
|
|
vdrop((struct vnode *)deferred_vdrop_list->pageq.tqe_prev);
|
|
deferred_vdrop_list = deferred_vdrop_list->pageq.tqe_next;
|
|
}
|
|
if (vm_paging_needed())
|
|
pagedaemon_wakeup();
|
|
return (m_ret);
|
|
}
|
|
|
|
/*
|
|
* Initialize a page that has been freshly dequeued from a freelist.
|
|
* The caller has to drop the vnode returned, if it is not NULL.
|
|
*
|
|
* This function may only be used to initialize unmanaged pages.
|
|
*
|
|
* To be called with vm_page_queue_free_mtx held.
|
|
*/
|
|
static struct vnode *
|
|
vm_page_alloc_init(vm_page_t m)
|
|
{
|
|
struct vnode *drop;
|
|
vm_object_t m_object;
|
|
|
|
KASSERT(m->queue == PQ_NONE,
|
|
("vm_page_alloc_init: page %p has unexpected queue %d",
|
|
m, m->queue));
|
|
KASSERT(m->wire_count == 0,
|
|
("vm_page_alloc_init: page %p is wired", m));
|
|
KASSERT(m->hold_count == 0,
|
|
("vm_page_alloc_init: page %p is held", m));
|
|
KASSERT(m->busy == 0,
|
|
("vm_page_alloc_init: page %p is busy", m));
|
|
KASSERT(m->dirty == 0,
|
|
("vm_page_alloc_init: page %p is dirty", m));
|
|
KASSERT(pmap_page_get_memattr(m) == VM_MEMATTR_DEFAULT,
|
|
("vm_page_alloc_init: page %p has unexpected memattr %d",
|
|
m, pmap_page_get_memattr(m)));
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
drop = NULL;
|
|
if ((m->flags & PG_CACHED) != 0) {
|
|
KASSERT((m->flags & PG_ZERO) == 0,
|
|
("vm_page_alloc_init: cached page %p is PG_ZERO", m));
|
|
m->valid = 0;
|
|
m_object = m->object;
|
|
vm_page_cache_remove(m);
|
|
if (m_object->type == OBJT_VNODE &&
|
|
vm_object_cache_is_empty(m_object))
|
|
drop = m_object->handle;
|
|
} else {
|
|
KASSERT(VM_PAGE_IS_FREE(m),
|
|
("vm_page_alloc_init: page %p is not free", m));
|
|
KASSERT(m->valid == 0,
|
|
("vm_page_alloc_init: free page %p is valid", m));
|
|
cnt.v_free_count--;
|
|
if ((m->flags & PG_ZERO) != 0)
|
|
vm_page_zero_count--;
|
|
}
|
|
/* Don't clear the PG_ZERO flag; we'll need it later. */
|
|
m->flags &= PG_ZERO;
|
|
return (drop);
|
|
}
|
|
|
|
/*
|
|
* vm_page_alloc_freelist:
|
|
*
|
|
* Allocate a physical page from the specified free page list.
|
|
*
|
|
* The caller must always specify an allocation class.
|
|
*
|
|
* allocation classes:
|
|
* VM_ALLOC_NORMAL normal process request
|
|
* VM_ALLOC_SYSTEM system *really* needs a page
|
|
* VM_ALLOC_INTERRUPT interrupt time request
|
|
*
|
|
* optional allocation flags:
|
|
* VM_ALLOC_COUNT(number) the number of additional pages that the caller
|
|
* intends to allocate
|
|
* VM_ALLOC_WIRED wire the allocated page
|
|
* VM_ALLOC_ZERO prefer a zeroed page
|
|
*
|
|
* This routine may not sleep.
|
|
*/
|
|
vm_page_t
|
|
vm_page_alloc_freelist(int flind, int req)
|
|
{
|
|
struct vnode *drop;
|
|
vm_page_t m;
|
|
u_int flags;
|
|
int req_class;
|
|
|
|
req_class = req & VM_ALLOC_CLASS_MASK;
|
|
|
|
/*
|
|
* The page daemon is allowed to dig deeper into the free page list.
|
|
*/
|
|
if (curproc == pageproc && req_class != VM_ALLOC_INTERRUPT)
|
|
req_class = VM_ALLOC_SYSTEM;
|
|
|
|
/*
|
|
* Do not allocate reserved pages unless the req has asked for it.
|
|
*/
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (cnt.v_free_count + cnt.v_cache_count > cnt.v_free_reserved ||
|
|
(req_class == VM_ALLOC_SYSTEM &&
|
|
cnt.v_free_count + cnt.v_cache_count > cnt.v_interrupt_free_min) ||
|
|
(req_class == VM_ALLOC_INTERRUPT &&
|
|
cnt.v_free_count + cnt.v_cache_count > 0))
|
|
m = vm_phys_alloc_freelist_pages(flind, VM_FREEPOOL_DIRECT, 0);
|
|
else {
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
atomic_add_int(&vm_pageout_deficit,
|
|
max((u_int)req >> VM_ALLOC_COUNT_SHIFT, 1));
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
if (m == NULL) {
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
return (NULL);
|
|
}
|
|
drop = vm_page_alloc_init(m);
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
|
|
/*
|
|
* Initialize the page. Only the PG_ZERO flag is inherited.
|
|
*/
|
|
m->aflags = 0;
|
|
flags = 0;
|
|
if ((req & VM_ALLOC_ZERO) != 0)
|
|
flags = PG_ZERO;
|
|
m->flags &= flags;
|
|
if ((req & VM_ALLOC_WIRED) != 0) {
|
|
/*
|
|
* The page lock is not required for wiring a page that does
|
|
* not belong to an object.
|
|
*/
|
|
atomic_add_int(&cnt.v_wire_count, 1);
|
|
m->wire_count = 1;
|
|
}
|
|
/* Unmanaged pages don't use "act_count". */
|
|
m->oflags = VPO_UNMANAGED;
|
|
if (drop != NULL)
|
|
vdrop(drop);
|
|
if (vm_paging_needed())
|
|
pagedaemon_wakeup();
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* vm_wait: (also see VM_WAIT macro)
|
|
*
|
|
* Sleep until free pages are available for allocation.
|
|
* - Called in various places before memory allocations.
|
|
*/
|
|
void
|
|
vm_wait(void)
|
|
{
|
|
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (curproc == pageproc) {
|
|
vm_pageout_pages_needed = 1;
|
|
msleep(&vm_pageout_pages_needed, &vm_page_queue_free_mtx,
|
|
PDROP | PSWP, "VMWait", 0);
|
|
} else {
|
|
if (!vm_pages_needed) {
|
|
vm_pages_needed = 1;
|
|
wakeup(&vm_pages_needed);
|
|
}
|
|
msleep(&cnt.v_free_count, &vm_page_queue_free_mtx, PDROP | PVM,
|
|
"vmwait", 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_waitpfault: (also see VM_WAITPFAULT macro)
|
|
*
|
|
* Sleep until free pages are available for allocation.
|
|
* - Called only in vm_fault so that processes page faulting
|
|
* can be easily tracked.
|
|
* - Sleeps at a lower priority than vm_wait() so that vm_wait()ing
|
|
* processes will be able to grab memory first. Do not change
|
|
* this balance without careful testing first.
|
|
*/
|
|
void
|
|
vm_waitpfault(void)
|
|
{
|
|
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
if (!vm_pages_needed) {
|
|
vm_pages_needed = 1;
|
|
wakeup(&vm_pages_needed);
|
|
}
|
|
msleep(&cnt.v_free_count, &vm_page_queue_free_mtx, PDROP | PUSER,
|
|
"pfault", 0);
|
|
}
|
|
|
|
/*
|
|
* vm_page_dequeue:
|
|
*
|
|
* Remove the given page from its current page queue.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
void
|
|
vm_page_dequeue(vm_page_t m)
|
|
{
|
|
struct vm_pagequeue *pq;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
KASSERT(m->queue != PQ_NONE,
|
|
("vm_page_dequeue: page %p is not queued", m));
|
|
pq = &vm_pagequeues[m->queue];
|
|
vm_pagequeue_lock(pq);
|
|
m->queue = PQ_NONE;
|
|
TAILQ_REMOVE(&pq->pq_pl, m, pageq);
|
|
(*pq->pq_cnt)--;
|
|
vm_pagequeue_unlock(pq);
|
|
}
|
|
|
|
/*
|
|
* vm_page_dequeue_locked:
|
|
*
|
|
* Remove the given page from its current page queue.
|
|
*
|
|
* The page and page queue must be locked.
|
|
*/
|
|
void
|
|
vm_page_dequeue_locked(vm_page_t m)
|
|
{
|
|
struct vm_pagequeue *pq;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
pq = &vm_pagequeues[m->queue];
|
|
vm_pagequeue_assert_locked(pq);
|
|
m->queue = PQ_NONE;
|
|
TAILQ_REMOVE(&pq->pq_pl, m, pageq);
|
|
(*pq->pq_cnt)--;
|
|
}
|
|
|
|
/*
|
|
* vm_page_enqueue:
|
|
*
|
|
* Add the given page to the specified page queue.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
static void
|
|
vm_page_enqueue(int queue, vm_page_t m)
|
|
{
|
|
struct vm_pagequeue *pq;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
pq = &vm_pagequeues[queue];
|
|
vm_pagequeue_lock(pq);
|
|
m->queue = queue;
|
|
TAILQ_INSERT_TAIL(&pq->pq_pl, m, pageq);
|
|
++*pq->pq_cnt;
|
|
vm_pagequeue_unlock(pq);
|
|
}
|
|
|
|
/*
|
|
* vm_page_requeue:
|
|
*
|
|
* Move the given page to the tail of its current page queue.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
void
|
|
vm_page_requeue(vm_page_t m)
|
|
{
|
|
struct vm_pagequeue *pq;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
KASSERT(m->queue != PQ_NONE,
|
|
("vm_page_requeue: page %p is not queued", m));
|
|
pq = &vm_pagequeues[m->queue];
|
|
vm_pagequeue_lock(pq);
|
|
TAILQ_REMOVE(&pq->pq_pl, m, pageq);
|
|
TAILQ_INSERT_TAIL(&pq->pq_pl, m, pageq);
|
|
vm_pagequeue_unlock(pq);
|
|
}
|
|
|
|
/*
|
|
* vm_page_requeue_locked:
|
|
*
|
|
* Move the given page to the tail of its current page queue.
|
|
*
|
|
* The page queue must be locked.
|
|
*/
|
|
void
|
|
vm_page_requeue_locked(vm_page_t m)
|
|
{
|
|
struct vm_pagequeue *pq;
|
|
|
|
KASSERT(m->queue != PQ_NONE,
|
|
("vm_page_requeue_locked: page %p is not queued", m));
|
|
pq = &vm_pagequeues[m->queue];
|
|
vm_pagequeue_assert_locked(pq);
|
|
TAILQ_REMOVE(&pq->pq_pl, m, pageq);
|
|
TAILQ_INSERT_TAIL(&pq->pq_pl, m, pageq);
|
|
}
|
|
|
|
/*
|
|
* vm_page_activate:
|
|
*
|
|
* Put the specified page on the active list (if appropriate).
|
|
* Ensure that act_count is at least ACT_INIT but do not otherwise
|
|
* mess with it.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
void
|
|
vm_page_activate(vm_page_t m)
|
|
{
|
|
int queue;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if ((queue = m->queue) != PQ_ACTIVE) {
|
|
if (m->wire_count == 0 && (m->oflags & VPO_UNMANAGED) == 0) {
|
|
if (m->act_count < ACT_INIT)
|
|
m->act_count = ACT_INIT;
|
|
if (queue != PQ_NONE)
|
|
vm_page_dequeue(m);
|
|
vm_page_enqueue(PQ_ACTIVE, m);
|
|
} else
|
|
KASSERT(queue == PQ_NONE,
|
|
("vm_page_activate: wired page %p is queued", m));
|
|
} else {
|
|
if (m->act_count < ACT_INIT)
|
|
m->act_count = ACT_INIT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_free_wakeup:
|
|
*
|
|
* Helper routine for vm_page_free_toq() and vm_page_cache(). This
|
|
* routine is called when a page has been added to the cache or free
|
|
* queues.
|
|
*
|
|
* The page queues must be locked.
|
|
*/
|
|
static inline void
|
|
vm_page_free_wakeup(void)
|
|
{
|
|
|
|
mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
|
|
/*
|
|
* if pageout daemon needs pages, then tell it that there are
|
|
* some free.
|
|
*/
|
|
if (vm_pageout_pages_needed &&
|
|
cnt.v_cache_count + cnt.v_free_count >= cnt.v_pageout_free_min) {
|
|
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 && !vm_page_count_min()) {
|
|
vm_pages_needed = 0;
|
|
wakeup(&cnt.v_free_count);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_free_toq:
|
|
*
|
|
* Returns the given page to the free list,
|
|
* disassociating it with any VM object.
|
|
*
|
|
* The object must be locked. The page must be locked if it is managed.
|
|
*/
|
|
void
|
|
vm_page_free_toq(vm_page_t m)
|
|
{
|
|
|
|
if ((m->oflags & VPO_UNMANAGED) == 0) {
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
KASSERT(!pmap_page_is_mapped(m),
|
|
("vm_page_free_toq: freeing mapped page %p", m));
|
|
} else
|
|
KASSERT(m->queue == PQ_NONE,
|
|
("vm_page_free_toq: unmanaged page %p is queued", m));
|
|
PCPU_INC(cnt.v_tfree);
|
|
|
|
if (VM_PAGE_IS_FREE(m))
|
|
panic("vm_page_free: freeing free page %p", m);
|
|
else if (m->busy != 0)
|
|
panic("vm_page_free: freeing busy page %p", m);
|
|
|
|
/*
|
|
* Unqueue, then remove page. Note that we cannot destroy
|
|
* the page here because we do not want to call the pager's
|
|
* callback routine until after we've put the page on the
|
|
* appropriate free queue.
|
|
*/
|
|
vm_page_remque(m);
|
|
vm_page_remove(m);
|
|
|
|
/*
|
|
* If fictitious remove object association and
|
|
* return, otherwise delay object association removal.
|
|
*/
|
|
if ((m->flags & PG_FICTITIOUS) != 0) {
|
|
return;
|
|
}
|
|
|
|
m->valid = 0;
|
|
vm_page_undirty(m);
|
|
|
|
if (m->wire_count != 0)
|
|
panic("vm_page_free: freeing wired page %p", m);
|
|
if (m->hold_count != 0) {
|
|
m->flags &= ~PG_ZERO;
|
|
KASSERT((m->flags & PG_UNHOLDFREE) == 0,
|
|
("vm_page_free: freeing PG_UNHOLDFREE page %p", m));
|
|
m->flags |= PG_UNHOLDFREE;
|
|
} else {
|
|
/*
|
|
* Restore the default memory attribute to the page.
|
|
*/
|
|
if (pmap_page_get_memattr(m) != VM_MEMATTR_DEFAULT)
|
|
pmap_page_set_memattr(m, VM_MEMATTR_DEFAULT);
|
|
|
|
/*
|
|
* Insert the page into the physical memory allocator's
|
|
* cache/free page queues.
|
|
*/
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
m->flags |= PG_FREE;
|
|
cnt.v_free_count++;
|
|
#if VM_NRESERVLEVEL > 0
|
|
if (!vm_reserv_free_page(m))
|
|
#else
|
|
if (TRUE)
|
|
#endif
|
|
vm_phys_free_pages(m, 0);
|
|
if ((m->flags & PG_ZERO) != 0)
|
|
++vm_page_zero_count;
|
|
else
|
|
vm_page_zero_idle_wakeup();
|
|
vm_page_free_wakeup();
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_wire:
|
|
*
|
|
* Mark this page as wired down by yet
|
|
* another map, removing it from paging queues
|
|
* as necessary.
|
|
*
|
|
* If the page is fictitious, then its wire count must remain one.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
void
|
|
vm_page_wire(vm_page_t m)
|
|
{
|
|
|
|
/*
|
|
* Only bump the wire statistics if the page is not already wired,
|
|
* and only unqueue the page if it is on some queue (if it is unmanaged
|
|
* it is already off the queues).
|
|
*/
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
if ((m->flags & PG_FICTITIOUS) != 0) {
|
|
KASSERT(m->wire_count == 1,
|
|
("vm_page_wire: fictitious page %p's wire count isn't one",
|
|
m));
|
|
return;
|
|
}
|
|
if (m->wire_count == 0) {
|
|
KASSERT((m->oflags & VPO_UNMANAGED) == 0 ||
|
|
m->queue == PQ_NONE,
|
|
("vm_page_wire: unmanaged page %p is queued", m));
|
|
vm_page_remque(m);
|
|
atomic_add_int(&cnt.v_wire_count, 1);
|
|
}
|
|
m->wire_count++;
|
|
KASSERT(m->wire_count != 0, ("vm_page_wire: wire_count overflow m=%p", m));
|
|
}
|
|
|
|
/*
|
|
* vm_page_unwire:
|
|
*
|
|
* Release one wiring of the specified page, potentially enabling it to be
|
|
* paged again. If paging is enabled, then the value of the parameter
|
|
* "activate" determines to which queue the page is added. If "activate" is
|
|
* non-zero, then the page is added to the active queue. Otherwise, it is
|
|
* added to the inactive queue.
|
|
*
|
|
* However, unless the page belongs to an object, it is not enqueued because
|
|
* it cannot be paged out.
|
|
*
|
|
* If a page is fictitious, then its wire count must alway be one.
|
|
*
|
|
* A managed page must be locked.
|
|
*/
|
|
void
|
|
vm_page_unwire(vm_page_t m, int activate)
|
|
{
|
|
|
|
if ((m->oflags & VPO_UNMANAGED) == 0)
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
if ((m->flags & PG_FICTITIOUS) != 0) {
|
|
KASSERT(m->wire_count == 1,
|
|
("vm_page_unwire: fictitious page %p's wire count isn't one", m));
|
|
return;
|
|
}
|
|
if (m->wire_count > 0) {
|
|
m->wire_count--;
|
|
if (m->wire_count == 0) {
|
|
atomic_subtract_int(&cnt.v_wire_count, 1);
|
|
if ((m->oflags & VPO_UNMANAGED) != 0 ||
|
|
m->object == NULL)
|
|
return;
|
|
if (!activate)
|
|
m->flags &= ~PG_WINATCFLS;
|
|
vm_page_enqueue(activate ? PQ_ACTIVE : PQ_INACTIVE, m);
|
|
}
|
|
} else
|
|
panic("vm_page_unwire: page %p's wire count is zero", m);
|
|
}
|
|
|
|
/*
|
|
* Move the specified page to the inactive queue.
|
|
*
|
|
* Many pages placed on the inactive queue should actually go
|
|
* into the cache, but it is difficult to figure out which. What
|
|
* we do instead, if the inactive target is well met, is to put
|
|
* clean pages at the head of the inactive queue instead of the tail.
|
|
* This will cause them to be moved to the cache more quickly and
|
|
* if not actively re-referenced, reclaimed more quickly. If we just
|
|
* stick these pages at the end of the inactive queue, heavy filesystem
|
|
* meta-data accesses can cause an unnecessary paging load on memory bound
|
|
* processes. This optimization causes one-time-use metadata to be
|
|
* reused more quickly.
|
|
*
|
|
* Normally athead is 0 resulting in LRU operation. athead is set
|
|
* to 1 if we want this page to be 'as if it were placed in the cache',
|
|
* except without unmapping it from the process address space.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
static inline void
|
|
_vm_page_deactivate(vm_page_t m, int athead)
|
|
{
|
|
struct vm_pagequeue *pq;
|
|
int queue;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
|
|
/*
|
|
* Ignore if already inactive.
|
|
*/
|
|
if ((queue = m->queue) == PQ_INACTIVE)
|
|
return;
|
|
if (m->wire_count == 0 && (m->oflags & VPO_UNMANAGED) == 0) {
|
|
if (queue != PQ_NONE)
|
|
vm_page_dequeue(m);
|
|
m->flags &= ~PG_WINATCFLS;
|
|
pq = &vm_pagequeues[PQ_INACTIVE];
|
|
vm_pagequeue_lock(pq);
|
|
m->queue = PQ_INACTIVE;
|
|
if (athead)
|
|
TAILQ_INSERT_HEAD(&pq->pq_pl, m, pageq);
|
|
else
|
|
TAILQ_INSERT_TAIL(&pq->pq_pl, m, pageq);
|
|
cnt.v_inactive_count++;
|
|
vm_pagequeue_unlock(pq);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Move the specified page to the inactive queue.
|
|
*
|
|
* The page must be locked.
|
|
*/
|
|
void
|
|
vm_page_deactivate(vm_page_t m)
|
|
{
|
|
|
|
_vm_page_deactivate(m, 0);
|
|
}
|
|
|
|
/*
|
|
* vm_page_try_to_cache:
|
|
*
|
|
* Returns 0 on failure, 1 on success
|
|
*/
|
|
int
|
|
vm_page_try_to_cache(vm_page_t m)
|
|
{
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if (m->dirty || m->hold_count || m->busy || m->wire_count ||
|
|
(m->oflags & (VPO_BUSY | VPO_UNMANAGED)) != 0)
|
|
return (0);
|
|
pmap_remove_all(m);
|
|
if (m->dirty)
|
|
return (0);
|
|
vm_page_cache(m);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* vm_page_try_to_free()
|
|
*
|
|
* Attempt to free the page. If we cannot free it, we do nothing.
|
|
* 1 is returned on success, 0 on failure.
|
|
*/
|
|
int
|
|
vm_page_try_to_free(vm_page_t m)
|
|
{
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
if (m->object != NULL)
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if (m->dirty || m->hold_count || m->busy || m->wire_count ||
|
|
(m->oflags & (VPO_BUSY | VPO_UNMANAGED)) != 0)
|
|
return (0);
|
|
pmap_remove_all(m);
|
|
if (m->dirty)
|
|
return (0);
|
|
vm_page_free(m);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* vm_page_cache
|
|
*
|
|
* Put the specified page onto the page cache queue (if appropriate).
|
|
*
|
|
* The object and page must be locked.
|
|
*/
|
|
void
|
|
vm_page_cache(vm_page_t m)
|
|
{
|
|
vm_object_t object;
|
|
vm_page_t next, prev, root;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
object = m->object;
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
if ((m->oflags & (VPO_UNMANAGED | VPO_BUSY)) || m->busy ||
|
|
m->hold_count || m->wire_count)
|
|
panic("vm_page_cache: attempting to cache busy page");
|
|
KASSERT(!pmap_page_is_mapped(m),
|
|
("vm_page_cache: page %p is mapped", m));
|
|
KASSERT(m->dirty == 0, ("vm_page_cache: page %p is dirty", m));
|
|
if (m->valid == 0 || object->type == OBJT_DEFAULT ||
|
|
(object->type == OBJT_SWAP &&
|
|
!vm_pager_has_page(object, m->pindex, NULL, NULL))) {
|
|
/*
|
|
* Hypothesis: A cache-elgible page belonging to a
|
|
* default object or swap object but without a backing
|
|
* store must be zero filled.
|
|
*/
|
|
vm_page_free(m);
|
|
return;
|
|
}
|
|
KASSERT((m->flags & PG_CACHED) == 0,
|
|
("vm_page_cache: page %p is already cached", m));
|
|
PCPU_INC(cnt.v_tcached);
|
|
|
|
/*
|
|
* Remove the page from the paging queues.
|
|
*/
|
|
vm_page_remque(m);
|
|
|
|
/*
|
|
* Remove the page from the object's collection of resident
|
|
* pages.
|
|
*/
|
|
if ((next = TAILQ_NEXT(m, listq)) != NULL && next->left == m) {
|
|
/*
|
|
* Since the page's successor in the list is also its parent
|
|
* in the tree, its right subtree must be empty.
|
|
*/
|
|
next->left = m->left;
|
|
KASSERT(m->right == NULL,
|
|
("vm_page_cache: page %p has right child", m));
|
|
} else if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL &&
|
|
prev->right == m) {
|
|
/*
|
|
* Since the page's predecessor in the list is also its parent
|
|
* in the tree, its left subtree must be empty.
|
|
*/
|
|
KASSERT(m->left == NULL,
|
|
("vm_page_cache: page %p has left child", m));
|
|
prev->right = m->right;
|
|
} else {
|
|
if (m != object->root)
|
|
vm_page_splay(m->pindex, object->root);
|
|
if (m->left == NULL)
|
|
root = m->right;
|
|
else if (m->right == NULL)
|
|
root = m->left;
|
|
else {
|
|
/*
|
|
* Move the page's successor to the root, because
|
|
* pages are usually removed in ascending order.
|
|
*/
|
|
if (m->right != next)
|
|
vm_page_splay(m->pindex, m->right);
|
|
next->left = m->left;
|
|
root = next;
|
|
}
|
|
object->root = root;
|
|
}
|
|
TAILQ_REMOVE(&object->memq, m, listq);
|
|
object->resident_page_count--;
|
|
|
|
/*
|
|
* Restore the default memory attribute to the page.
|
|
*/
|
|
if (pmap_page_get_memattr(m) != VM_MEMATTR_DEFAULT)
|
|
pmap_page_set_memattr(m, VM_MEMATTR_DEFAULT);
|
|
|
|
/*
|
|
* Insert the page into the object's collection of cached pages
|
|
* and the physical memory allocator's cache/free page queues.
|
|
*/
|
|
m->flags &= ~PG_ZERO;
|
|
mtx_lock(&vm_page_queue_free_mtx);
|
|
m->flags |= PG_CACHED;
|
|
cnt.v_cache_count++;
|
|
root = object->cache;
|
|
if (root == NULL) {
|
|
m->left = NULL;
|
|
m->right = NULL;
|
|
} else {
|
|
root = vm_page_splay(m->pindex, root);
|
|
if (m->pindex < root->pindex) {
|
|
m->left = root->left;
|
|
m->right = root;
|
|
root->left = NULL;
|
|
} else if (__predict_false(m->pindex == root->pindex))
|
|
panic("vm_page_cache: offset already cached");
|
|
else {
|
|
m->right = root->right;
|
|
m->left = root;
|
|
root->right = NULL;
|
|
}
|
|
}
|
|
object->cache = m;
|
|
#if VM_NRESERVLEVEL > 0
|
|
if (!vm_reserv_free_page(m)) {
|
|
#else
|
|
if (TRUE) {
|
|
#endif
|
|
vm_phys_set_pool(VM_FREEPOOL_CACHE, m, 0);
|
|
vm_phys_free_pages(m, 0);
|
|
}
|
|
vm_page_free_wakeup();
|
|
mtx_unlock(&vm_page_queue_free_mtx);
|
|
|
|
/*
|
|
* Increment the vnode's hold count if this is the object's only
|
|
* cached page. Decrement the vnode's hold count if this was
|
|
* the object's only resident page.
|
|
*/
|
|
if (object->type == OBJT_VNODE) {
|
|
if (root == NULL && object->resident_page_count != 0)
|
|
vhold(object->handle);
|
|
else if (root != NULL && object->resident_page_count == 0)
|
|
vdrop(object->handle);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_dontneed
|
|
*
|
|
* Cache, deactivate, or do nothing as appropriate. This routine
|
|
* is typically used by madvise() MADV_DONTNEED.
|
|
*
|
|
* Generally speaking we want to move the page into the cache so
|
|
* it gets reused quickly. However, this can result in a silly syndrome
|
|
* due to the page recycling too quickly. Small objects will not be
|
|
* fully cached. On the otherhand, if we move the page to the inactive
|
|
* queue we wind up with a problem whereby very large objects
|
|
* unnecessarily blow away our inactive and cache queues.
|
|
*
|
|
* The solution is to move the pages based on a fixed weighting. We
|
|
* either leave them alone, deactivate them, or move them to the cache,
|
|
* where moving them to the cache has the highest weighting.
|
|
* By forcing some pages into other queues we eventually force the
|
|
* system to balance the queues, potentially recovering other unrelated
|
|
* space from active. The idea is to not force this to happen too
|
|
* often.
|
|
*
|
|
* The object and page must be locked.
|
|
*/
|
|
void
|
|
vm_page_dontneed(vm_page_t m)
|
|
{
|
|
int dnw;
|
|
int head;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
dnw = PCPU_GET(dnweight);
|
|
PCPU_INC(dnweight);
|
|
|
|
/*
|
|
* Occasionally leave the page alone.
|
|
*/
|
|
if ((dnw & 0x01F0) == 0 || m->queue == PQ_INACTIVE) {
|
|
if (m->act_count >= ACT_INIT)
|
|
--m->act_count;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Clear any references to the page. Otherwise, the page daemon will
|
|
* immediately reactivate the page.
|
|
*
|
|
* Perform the pmap_clear_reference() first. Otherwise, a concurrent
|
|
* pmap operation, such as pmap_remove(), could clear a reference in
|
|
* the pmap and set PGA_REFERENCED on the page before the
|
|
* pmap_clear_reference() had completed. Consequently, the page would
|
|
* appear referenced based upon an old reference that occurred before
|
|
* this function ran.
|
|
*/
|
|
pmap_clear_reference(m);
|
|
vm_page_aflag_clear(m, PGA_REFERENCED);
|
|
|
|
if (m->dirty == 0 && pmap_is_modified(m))
|
|
vm_page_dirty(m);
|
|
|
|
if (m->dirty || (dnw & 0x0070) == 0) {
|
|
/*
|
|
* Deactivate the page 3 times out of 32.
|
|
*/
|
|
head = 0;
|
|
} else {
|
|
/*
|
|
* Cache the page 28 times out of every 32. Note that
|
|
* the page is deactivated instead of cached, but placed
|
|
* at the head of the queue instead of the tail.
|
|
*/
|
|
head = 1;
|
|
}
|
|
_vm_page_deactivate(m, head);
|
|
}
|
|
|
|
/*
|
|
* Grab a page, waiting until we are waken up due to the page
|
|
* changing state. We keep on waiting, if the page continues
|
|
* to be in the object. If the page doesn't exist, first allocate it
|
|
* and then conditionally zero it.
|
|
*
|
|
* The caller must always specify the VM_ALLOC_RETRY flag. This is intended
|
|
* to facilitate its eventual removal.
|
|
*
|
|
* This routine may sleep.
|
|
*
|
|
* The object must be locked on entry. The lock will, however, be released
|
|
* and reacquired if the routine sleeps.
|
|
*/
|
|
vm_page_t
|
|
vm_page_grab(vm_object_t object, vm_pindex_t pindex, int allocflags)
|
|
{
|
|
vm_page_t m;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
KASSERT((allocflags & VM_ALLOC_RETRY) != 0,
|
|
("vm_page_grab: VM_ALLOC_RETRY is required"));
|
|
retrylookup:
|
|
if ((m = vm_page_lookup(object, pindex)) != NULL) {
|
|
if ((m->oflags & VPO_BUSY) != 0 ||
|
|
((allocflags & VM_ALLOC_IGN_SBUSY) == 0 && m->busy != 0)) {
|
|
/*
|
|
* Reference the page before unlocking and
|
|
* sleeping so that the page daemon is less
|
|
* likely to reclaim it.
|
|
*/
|
|
vm_page_aflag_set(m, PGA_REFERENCED);
|
|
vm_page_sleep(m, "pgrbwt");
|
|
goto retrylookup;
|
|
} else {
|
|
if ((allocflags & VM_ALLOC_WIRED) != 0) {
|
|
vm_page_lock(m);
|
|
vm_page_wire(m);
|
|
vm_page_unlock(m);
|
|
}
|
|
if ((allocflags & VM_ALLOC_NOBUSY) == 0)
|
|
vm_page_busy(m);
|
|
return (m);
|
|
}
|
|
}
|
|
m = vm_page_alloc(object, pindex, allocflags & ~(VM_ALLOC_RETRY |
|
|
VM_ALLOC_IGN_SBUSY));
|
|
if (m == NULL) {
|
|
VM_OBJECT_WUNLOCK(object);
|
|
VM_WAIT;
|
|
VM_OBJECT_WLOCK(object);
|
|
goto retrylookup;
|
|
} else if (m->valid != 0)
|
|
return (m);
|
|
if (allocflags & VM_ALLOC_ZERO && (m->flags & PG_ZERO) == 0)
|
|
pmap_zero_page(m);
|
|
return (m);
|
|
}
|
|
|
|
/*
|
|
* Mapping function for valid or dirty bits in a page.
|
|
*
|
|
* Inputs are required to range within a page.
|
|
*/
|
|
vm_page_bits_t
|
|
vm_page_bits(int base, int size)
|
|
{
|
|
int first_bit;
|
|
int last_bit;
|
|
|
|
KASSERT(
|
|
base + size <= PAGE_SIZE,
|
|
("vm_page_bits: illegal base/size %d/%d", base, size)
|
|
);
|
|
|
|
if (size == 0) /* handle degenerate case */
|
|
return (0);
|
|
|
|
first_bit = base >> DEV_BSHIFT;
|
|
last_bit = (base + size - 1) >> DEV_BSHIFT;
|
|
|
|
return (((vm_page_bits_t)2 << last_bit) -
|
|
((vm_page_bits_t)1 << first_bit));
|
|
}
|
|
|
|
/*
|
|
* vm_page_set_valid_range:
|
|
*
|
|
* Sets portions of a page valid. The arguments are expected
|
|
* to be DEV_BSIZE aligned but if they aren't the bitmap is inclusive
|
|
* of any partial chunks touched by the range. The invalid portion of
|
|
* such chunks will be zeroed.
|
|
*
|
|
* (base + size) must be less then or equal to PAGE_SIZE.
|
|
*/
|
|
void
|
|
vm_page_set_valid_range(vm_page_t m, int base, int size)
|
|
{
|
|
int endoff, frag;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if (size == 0) /* handle degenerate case */
|
|
return;
|
|
|
|
/*
|
|
* If the base is not DEV_BSIZE aligned and the valid
|
|
* bit is clear, we have to zero out a portion of the
|
|
* first block.
|
|
*/
|
|
if ((frag = base & ~(DEV_BSIZE - 1)) != base &&
|
|
(m->valid & (1 << (base >> DEV_BSHIFT))) == 0)
|
|
pmap_zero_page_area(m, frag, base - frag);
|
|
|
|
/*
|
|
* If the ending offset is not DEV_BSIZE aligned and the
|
|
* valid bit is clear, we have to zero out a portion of
|
|
* the last block.
|
|
*/
|
|
endoff = base + size;
|
|
if ((frag = endoff & ~(DEV_BSIZE - 1)) != endoff &&
|
|
(m->valid & (1 << (endoff >> DEV_BSHIFT))) == 0)
|
|
pmap_zero_page_area(m, endoff,
|
|
DEV_BSIZE - (endoff & (DEV_BSIZE - 1)));
|
|
|
|
/*
|
|
* Assert that no previously invalid block that is now being validated
|
|
* is already dirty.
|
|
*/
|
|
KASSERT((~m->valid & vm_page_bits(base, size) & m->dirty) == 0,
|
|
("vm_page_set_valid_range: page %p is dirty", m));
|
|
|
|
/*
|
|
* Set valid bits inclusive of any overlap.
|
|
*/
|
|
m->valid |= vm_page_bits(base, size);
|
|
}
|
|
|
|
/*
|
|
* Clear the given bits from the specified page's dirty field.
|
|
*/
|
|
static __inline void
|
|
vm_page_clear_dirty_mask(vm_page_t m, vm_page_bits_t pagebits)
|
|
{
|
|
uintptr_t addr;
|
|
#if PAGE_SIZE < 16384
|
|
int shift;
|
|
#endif
|
|
|
|
/*
|
|
* If the object is locked and the page is neither VPO_BUSY nor
|
|
* write mapped, then the page's dirty field cannot possibly be
|
|
* set by a concurrent pmap operation.
|
|
*/
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if ((m->oflags & VPO_BUSY) == 0 && !pmap_page_is_write_mapped(m))
|
|
m->dirty &= ~pagebits;
|
|
else {
|
|
/*
|
|
* The pmap layer can call vm_page_dirty() without
|
|
* holding a distinguished lock. The combination of
|
|
* the object's lock and an atomic operation suffice
|
|
* to guarantee consistency of the page dirty field.
|
|
*
|
|
* For PAGE_SIZE == 32768 case, compiler already
|
|
* properly aligns the dirty field, so no forcible
|
|
* alignment is needed. Only require existence of
|
|
* atomic_clear_64 when page size is 32768.
|
|
*/
|
|
addr = (uintptr_t)&m->dirty;
|
|
#if PAGE_SIZE == 32768
|
|
atomic_clear_64((uint64_t *)addr, pagebits);
|
|
#elif PAGE_SIZE == 16384
|
|
atomic_clear_32((uint32_t *)addr, pagebits);
|
|
#else /* PAGE_SIZE <= 8192 */
|
|
/*
|
|
* Use a trick to perform a 32-bit atomic on the
|
|
* containing aligned word, to not depend on the existence
|
|
* of atomic_clear_{8, 16}.
|
|
*/
|
|
shift = addr & (sizeof(uint32_t) - 1);
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
shift = (sizeof(uint32_t) - sizeof(m->dirty) - shift) * NBBY;
|
|
#else
|
|
shift *= NBBY;
|
|
#endif
|
|
addr &= ~(sizeof(uint32_t) - 1);
|
|
atomic_clear_32((uint32_t *)addr, pagebits << shift);
|
|
#endif /* PAGE_SIZE */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_set_validclean:
|
|
*
|
|
* Sets portions of a page valid and clean. The arguments are expected
|
|
* to be DEV_BSIZE aligned but if they aren't the bitmap is inclusive
|
|
* of any partial chunks touched by the range. The invalid portion of
|
|
* such chunks will be zero'd.
|
|
*
|
|
* (base + size) must be less then or equal to PAGE_SIZE.
|
|
*/
|
|
void
|
|
vm_page_set_validclean(vm_page_t m, int base, int size)
|
|
{
|
|
vm_page_bits_t oldvalid, pagebits;
|
|
int endoff, frag;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if (size == 0) /* handle degenerate case */
|
|
return;
|
|
|
|
/*
|
|
* If the base is not DEV_BSIZE aligned and the valid
|
|
* bit is clear, we have to zero out a portion of the
|
|
* first block.
|
|
*/
|
|
if ((frag = base & ~(DEV_BSIZE - 1)) != base &&
|
|
(m->valid & ((vm_page_bits_t)1 << (base >> DEV_BSHIFT))) == 0)
|
|
pmap_zero_page_area(m, frag, base - frag);
|
|
|
|
/*
|
|
* If the ending offset is not DEV_BSIZE aligned and the
|
|
* valid bit is clear, we have to zero out a portion of
|
|
* the last block.
|
|
*/
|
|
endoff = base + size;
|
|
if ((frag = endoff & ~(DEV_BSIZE - 1)) != endoff &&
|
|
(m->valid & ((vm_page_bits_t)1 << (endoff >> DEV_BSHIFT))) == 0)
|
|
pmap_zero_page_area(m, endoff,
|
|
DEV_BSIZE - (endoff & (DEV_BSIZE - 1)));
|
|
|
|
/*
|
|
* Set valid, clear dirty bits. If validating the entire
|
|
* page we can safely clear the pmap modify bit. We also
|
|
* use this opportunity to clear the VPO_NOSYNC flag. If a process
|
|
* takes a write fault on a MAP_NOSYNC memory area the flag will
|
|
* be set again.
|
|
*
|
|
* We set valid bits inclusive of any overlap, but we can only
|
|
* clear dirty bits for DEV_BSIZE chunks that are fully within
|
|
* the range.
|
|
*/
|
|
oldvalid = m->valid;
|
|
pagebits = vm_page_bits(base, size);
|
|
m->valid |= pagebits;
|
|
#if 0 /* NOT YET */
|
|
if ((frag = base & (DEV_BSIZE - 1)) != 0) {
|
|
frag = DEV_BSIZE - frag;
|
|
base += frag;
|
|
size -= frag;
|
|
if (size < 0)
|
|
size = 0;
|
|
}
|
|
pagebits = vm_page_bits(base, size & (DEV_BSIZE - 1));
|
|
#endif
|
|
if (base == 0 && size == PAGE_SIZE) {
|
|
/*
|
|
* The page can only be modified within the pmap if it is
|
|
* mapped, and it can only be mapped if it was previously
|
|
* fully valid.
|
|
*/
|
|
if (oldvalid == VM_PAGE_BITS_ALL)
|
|
/*
|
|
* Perform the pmap_clear_modify() first. Otherwise,
|
|
* a concurrent pmap operation, such as
|
|
* pmap_protect(), could clear a modification in the
|
|
* pmap and set the dirty field on the page before
|
|
* pmap_clear_modify() had begun and after the dirty
|
|
* field was cleared here.
|
|
*/
|
|
pmap_clear_modify(m);
|
|
m->dirty = 0;
|
|
m->oflags &= ~VPO_NOSYNC;
|
|
} else if (oldvalid != VM_PAGE_BITS_ALL)
|
|
m->dirty &= ~pagebits;
|
|
else
|
|
vm_page_clear_dirty_mask(m, pagebits);
|
|
}
|
|
|
|
void
|
|
vm_page_clear_dirty(vm_page_t m, int base, int size)
|
|
{
|
|
|
|
vm_page_clear_dirty_mask(m, vm_page_bits(base, size));
|
|
}
|
|
|
|
/*
|
|
* vm_page_set_invalid:
|
|
*
|
|
* Invalidates DEV_BSIZE'd chunks within a page. Both the
|
|
* valid and dirty bits for the effected areas are cleared.
|
|
*/
|
|
void
|
|
vm_page_set_invalid(vm_page_t m, int base, int size)
|
|
{
|
|
vm_page_bits_t bits;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
KASSERT((m->oflags & VPO_BUSY) == 0,
|
|
("vm_page_set_invalid: page %p is busy", m));
|
|
bits = vm_page_bits(base, size);
|
|
if (m->valid == VM_PAGE_BITS_ALL && bits != 0)
|
|
pmap_remove_all(m);
|
|
KASSERT(!pmap_page_is_mapped(m),
|
|
("vm_page_set_invalid: page %p is mapped", m));
|
|
m->valid &= ~bits;
|
|
m->dirty &= ~bits;
|
|
}
|
|
|
|
/*
|
|
* vm_page_zero_invalid()
|
|
*
|
|
* The kernel assumes that the invalid portions of a page contain
|
|
* garbage, but such pages can be mapped into memory by user code.
|
|
* When this occurs, we must zero out the non-valid portions of the
|
|
* page so user code sees what it expects.
|
|
*
|
|
* Pages are most often semi-valid when the end of a file is mapped
|
|
* into memory and the file's size is not page aligned.
|
|
*/
|
|
void
|
|
vm_page_zero_invalid(vm_page_t m, boolean_t setvalid)
|
|
{
|
|
int b;
|
|
int i;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
/*
|
|
* Scan the valid bits looking for invalid sections that
|
|
* must be zerod. Invalid sub-DEV_BSIZE'd areas ( where the
|
|
* valid bit may be set ) have already been zerod by
|
|
* vm_page_set_validclean().
|
|
*/
|
|
for (b = i = 0; i <= PAGE_SIZE / DEV_BSIZE; ++i) {
|
|
if (i == (PAGE_SIZE / DEV_BSIZE) ||
|
|
(m->valid & ((vm_page_bits_t)1 << i))) {
|
|
if (i > b) {
|
|
pmap_zero_page_area(m,
|
|
b << DEV_BSHIFT, (i - b) << DEV_BSHIFT);
|
|
}
|
|
b = i + 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* setvalid is TRUE when we can safely set the zero'd areas
|
|
* as being valid. We can do this if there are no cache consistancy
|
|
* issues. e.g. it is ok to do with UFS, but not ok to do with NFS.
|
|
*/
|
|
if (setvalid)
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
}
|
|
|
|
/*
|
|
* vm_page_is_valid:
|
|
*
|
|
* Is (partial) page valid? Note that the case where size == 0
|
|
* will return FALSE in the degenerate case where the page is
|
|
* entirely invalid, and TRUE otherwise.
|
|
*/
|
|
int
|
|
vm_page_is_valid(vm_page_t m, int base, int size)
|
|
{
|
|
vm_page_bits_t bits;
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
bits = vm_page_bits(base, size);
|
|
return (m->valid != 0 && (m->valid & bits) == bits);
|
|
}
|
|
|
|
/*
|
|
* Set the page's dirty bits if the page is modified.
|
|
*/
|
|
void
|
|
vm_page_test_dirty(vm_page_t m)
|
|
{
|
|
|
|
VM_OBJECT_ASSERT_WLOCKED(m->object);
|
|
if (m->dirty != VM_PAGE_BITS_ALL && pmap_is_modified(m))
|
|
vm_page_dirty(m);
|
|
}
|
|
|
|
void
|
|
vm_page_lock_KBI(vm_page_t m, const char *file, int line)
|
|
{
|
|
|
|
mtx_lock_flags_(vm_page_lockptr(m), 0, file, line);
|
|
}
|
|
|
|
void
|
|
vm_page_unlock_KBI(vm_page_t m, const char *file, int line)
|
|
{
|
|
|
|
mtx_unlock_flags_(vm_page_lockptr(m), 0, file, line);
|
|
}
|
|
|
|
int
|
|
vm_page_trylock_KBI(vm_page_t m, const char *file, int line)
|
|
{
|
|
|
|
return (mtx_trylock_flags_(vm_page_lockptr(m), 0, file, line));
|
|
}
|
|
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
void
|
|
vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line)
|
|
{
|
|
|
|
mtx_assert_(vm_page_lockptr(m), a, file, line);
|
|
}
|
|
#endif
|
|
|
|
int so_zerocp_fullpage = 0;
|
|
|
|
/*
|
|
* Replace the given page with a copy. The copied page assumes
|
|
* the portion of the given page's "wire_count" that is not the
|
|
* responsibility of this copy-on-write mechanism.
|
|
*
|
|
* The object containing the given page must have a non-zero
|
|
* paging-in-progress count and be locked.
|
|
*/
|
|
void
|
|
vm_page_cowfault(vm_page_t m)
|
|
{
|
|
vm_page_t mnew;
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
object = m->object;
|
|
VM_OBJECT_ASSERT_WLOCKED(object);
|
|
KASSERT(object->paging_in_progress != 0,
|
|
("vm_page_cowfault: object %p's paging-in-progress count is zero.",
|
|
object));
|
|
pindex = m->pindex;
|
|
|
|
retry_alloc:
|
|
pmap_remove_all(m);
|
|
vm_page_remove(m);
|
|
mnew = vm_page_alloc(object, pindex, VM_ALLOC_NORMAL | VM_ALLOC_NOBUSY);
|
|
if (mnew == NULL) {
|
|
vm_page_insert(m, object, pindex);
|
|
vm_page_unlock(m);
|
|
VM_OBJECT_WUNLOCK(object);
|
|
VM_WAIT;
|
|
VM_OBJECT_WLOCK(object);
|
|
if (m == vm_page_lookup(object, pindex)) {
|
|
vm_page_lock(m);
|
|
goto retry_alloc;
|
|
} else {
|
|
/*
|
|
* Page disappeared during the wait.
|
|
*/
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (m->cow == 0) {
|
|
/*
|
|
* check to see if we raced with an xmit complete when
|
|
* waiting to allocate a page. If so, put things back
|
|
* the way they were
|
|
*/
|
|
vm_page_unlock(m);
|
|
vm_page_lock(mnew);
|
|
vm_page_free(mnew);
|
|
vm_page_unlock(mnew);
|
|
vm_page_insert(m, object, pindex);
|
|
} else { /* clear COW & copy page */
|
|
if (!so_zerocp_fullpage)
|
|
pmap_copy_page(m, mnew);
|
|
mnew->valid = VM_PAGE_BITS_ALL;
|
|
vm_page_dirty(mnew);
|
|
mnew->wire_count = m->wire_count - m->cow;
|
|
m->wire_count = m->cow;
|
|
vm_page_unlock(m);
|
|
}
|
|
}
|
|
|
|
void
|
|
vm_page_cowclear(vm_page_t m)
|
|
{
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
if (m->cow) {
|
|
m->cow--;
|
|
/*
|
|
* let vm_fault add back write permission lazily
|
|
*/
|
|
}
|
|
/*
|
|
* sf_buf_free() will free the page, so we needn't do it here
|
|
*/
|
|
}
|
|
|
|
int
|
|
vm_page_cowsetup(vm_page_t m)
|
|
{
|
|
|
|
vm_page_lock_assert(m, MA_OWNED);
|
|
if ((m->flags & PG_FICTITIOUS) != 0 ||
|
|
(m->oflags & VPO_UNMANAGED) != 0 ||
|
|
m->cow == USHRT_MAX - 1 || !VM_OBJECT_TRYWLOCK(m->object))
|
|
return (EBUSY);
|
|
m->cow++;
|
|
pmap_remove_write(m);
|
|
VM_OBJECT_WUNLOCK(m->object);
|
|
return (0);
|
|
}
|
|
|
|
#ifdef INVARIANTS
|
|
void
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vm_page_object_lock_assert(vm_page_t m)
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{
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/*
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* Certain of the page's fields may only be modified by the
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* holder of the containing object's lock or the setter of the
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* page's VPO_BUSY flag. Unfortunately, the setter of the
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* VPO_BUSY flag is not recorded, and thus cannot be checked
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* here.
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*/
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if (m->object != NULL && (m->oflags & VPO_BUSY) == 0)
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VM_OBJECT_ASSERT_WLOCKED(m->object);
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}
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#endif
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#include "opt_ddb.h"
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#ifdef DDB
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#include <sys/kernel.h>
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#include <ddb/ddb.h>
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DB_SHOW_COMMAND(page, vm_page_print_page_info)
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{
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db_printf("cnt.v_free_count: %d\n", cnt.v_free_count);
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db_printf("cnt.v_cache_count: %d\n", cnt.v_cache_count);
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db_printf("cnt.v_inactive_count: %d\n", cnt.v_inactive_count);
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db_printf("cnt.v_active_count: %d\n", cnt.v_active_count);
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db_printf("cnt.v_wire_count: %d\n", cnt.v_wire_count);
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db_printf("cnt.v_free_reserved: %d\n", cnt.v_free_reserved);
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db_printf("cnt.v_free_min: %d\n", cnt.v_free_min);
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db_printf("cnt.v_free_target: %d\n", cnt.v_free_target);
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db_printf("cnt.v_cache_min: %d\n", cnt.v_cache_min);
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db_printf("cnt.v_inactive_target: %d\n", cnt.v_inactive_target);
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}
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DB_SHOW_COMMAND(pageq, vm_page_print_pageq_info)
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{
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db_printf("PQ_FREE:");
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db_printf(" %d", cnt.v_free_count);
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db_printf("\n");
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db_printf("PQ_CACHE:");
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db_printf(" %d", cnt.v_cache_count);
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db_printf("\n");
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db_printf("PQ_ACTIVE: %d, PQ_INACTIVE: %d\n",
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*vm_pagequeues[PQ_ACTIVE].pq_cnt,
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*vm_pagequeues[PQ_INACTIVE].pq_cnt);
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}
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#endif /* DDB */
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