Use it and several other vm_page_*_valid() functions in more places. Suggested and reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D37024
1028 lines
37 KiB
C
1028 lines
37 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. 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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* 3. 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.h 8.2 (Berkeley) 12/13/93
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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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* $FreeBSD$
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*/
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/*
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* Resident memory system definitions.
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*/
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#ifndef _VM_PAGE_
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#define _VM_PAGE_
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#include <vm/pmap.h>
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#include <vm/_vm_phys.h>
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/*
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* Management of resident (logical) pages.
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*
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* A small structure is kept for each resident
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* page, indexed by page number. Each structure
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* is an element of several collections:
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*
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* A radix tree used to quickly
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* perform object/offset lookups
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*
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* A list of all pages for a given object,
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* so they can be quickly deactivated at
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* time of deallocation.
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*
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* An ordered list of pages due for pageout.
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*
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* In addition, the structure contains the object
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* and offset to which this page belongs (for pageout),
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* and sundry status bits.
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*
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* In general, operations on this structure's mutable fields are
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* synchronized using either one of or a combination of locks. If a
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* field is annotated with two of these locks then holding either is
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* sufficient for read access but both are required for write access.
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* The queue lock for a page depends on the value of its queue field and is
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* described in detail below.
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*
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* The following annotations are possible:
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* (A) the field must be accessed using atomic(9) and may require
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* additional synchronization.
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* (B) the page busy lock.
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* (C) the field is immutable.
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* (F) the per-domain lock for the free queues.
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* (M) Machine dependent, defined by pmap layer.
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* (O) the object that the page belongs to.
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* (Q) the page's queue lock.
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*
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* The busy lock is an embedded reader-writer lock that protects the
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* page's contents and identity (i.e., its <object, pindex> tuple) as
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* well as certain valid/dirty modifications. To avoid bloating the
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* the page structure, the busy lock lacks some of the features available
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* the kernel's general-purpose synchronization primitives. As a result,
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* busy lock ordering rules are not verified, lock recursion is not
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* detected, and an attempt to xbusy a busy page or sbusy an xbusy page
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* results will trigger a panic rather than causing the thread to block.
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* vm_page_sleep_if_busy() can be used to sleep until the page's busy
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* state changes, after which the caller must re-lookup the page and
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* re-evaluate its state. vm_page_busy_acquire() will block until
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* the lock is acquired.
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*
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* The valid field is protected by the page busy lock (B) and object
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* lock (O). Transitions from invalid to valid are generally done
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* via I/O or zero filling and do not require the object lock.
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* These must be protected with the busy lock to prevent page-in or
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* creation races. Page invalidation generally happens as a result
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* of truncate or msync. When invalidated, pages must not be present
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* in pmap and must hold the object lock to prevent concurrent
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* speculative read-only mappings that do not require busy. I/O
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* routines may check for validity without a lock if they are prepared
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* to handle invalidation races with higher level locks (vnode) or are
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* unconcerned with races so long as they hold a reference to prevent
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* recycling. When a valid bit is set while holding a shared busy
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* lock (A) atomic operations are used to protect against concurrent
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* modification.
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*
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* In contrast, the synchronization of accesses to the page's
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* dirty field is a mix of machine dependent (M) and busy (B). In
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* the machine-independent layer, the page busy must be held to
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* operate on the field. However, the pmap layer is permitted to
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* set all bits within the field without holding that lock. If the
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* underlying architecture does not support atomic read-modify-write
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* operations on the field's type, then the machine-independent
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* layer uses a 32-bit atomic on the aligned 32-bit word that
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* contains the dirty field. In the machine-independent layer,
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* the implementation of read-modify-write operations on the
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* field is encapsulated in vm_page_clear_dirty_mask(). An
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* exclusive busy lock combined with pmap_remove_{write/all}() is the
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* only way to ensure a page can not become dirty. I/O generally
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* removes the page from pmap to ensure exclusive access and atomic
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* writes.
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*
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* The ref_count field tracks references to the page. References that
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* prevent the page from being reclaimable are called wirings and are
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* counted in the low bits of ref_count. The containing object's
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* reference, if one exists, is counted using the VPRC_OBJREF bit in the
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* ref_count field. Additionally, the VPRC_BLOCKED bit is used to
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* atomically check for wirings and prevent new wirings via
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* pmap_extract_and_hold(). When a page belongs to an object, it may be
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* wired only when the object is locked, or the page is busy, or by
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* pmap_extract_and_hold(). As a result, if the object is locked and the
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* page is not busy (or is exclusively busied by the current thread), and
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* the page is unmapped, its wire count will not increase. The ref_count
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* field is updated using atomic operations in most cases, except when it
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* is known that no other references to the page exist, such as in the page
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* allocator. A page may be present in the page queues, or even actively
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* scanned by the page daemon, without an explicitly counted referenced.
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* The page daemon must therefore handle the possibility of a concurrent
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* free of the page.
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*
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* The queue state of a page consists of the queue and act_count fields of
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* its atomically updated state, and the subset of atomic flags specified
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* by PGA_QUEUE_STATE_MASK. The queue field contains the page's page queue
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* index, or PQ_NONE if it does not belong to a page queue. To modify the
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* queue field, the page queue lock corresponding to the old value must be
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* held, unless that value is PQ_NONE, in which case the queue index must
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* be updated using an atomic RMW operation. There is one exception to
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* this rule: the page daemon may transition the queue field from
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* PQ_INACTIVE to PQ_NONE immediately prior to freeing the page during an
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* inactive queue scan. At that point the page is already dequeued and no
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* other references to that vm_page structure can exist. The PGA_ENQUEUED
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* flag, when set, indicates that the page structure is physically inserted
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* into the queue corresponding to the page's queue index, and may only be
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* set or cleared with the corresponding page queue lock held.
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*
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* To avoid contention on page queue locks, page queue operations (enqueue,
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* dequeue, requeue) are batched using fixed-size per-CPU queues. A
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* deferred operation is requested by setting one of the flags in
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* PGA_QUEUE_OP_MASK and inserting an entry into a batch queue. When a
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* queue is full, an attempt to insert a new entry will lock the page
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* queues and trigger processing of the pending entries. The
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* type-stability of vm_page structures is crucial to this scheme since the
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* processing of entries in a given batch queue may be deferred
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* indefinitely. In particular, a page may be freed with pending batch
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* queue entries. The page queue operation flags must be set using atomic
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* RWM operations.
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*/
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#if PAGE_SIZE == 4096
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#define VM_PAGE_BITS_ALL 0xffu
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typedef uint8_t vm_page_bits_t;
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#elif PAGE_SIZE == 8192
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#define VM_PAGE_BITS_ALL 0xffffu
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typedef uint16_t vm_page_bits_t;
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#elif PAGE_SIZE == 16384
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#define VM_PAGE_BITS_ALL 0xffffffffu
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typedef uint32_t vm_page_bits_t;
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#elif PAGE_SIZE == 32768
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#define VM_PAGE_BITS_ALL 0xfffffffffffffffflu
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typedef uint64_t vm_page_bits_t;
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#endif
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typedef union vm_page_astate {
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struct {
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uint16_t flags;
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uint8_t queue;
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uint8_t act_count;
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};
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uint32_t _bits;
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} vm_page_astate_t;
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struct vm_page {
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union {
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TAILQ_ENTRY(vm_page) q; /* page queue or free list (Q) */
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struct {
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SLIST_ENTRY(vm_page) ss; /* private slists */
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} s;
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struct {
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u_long p;
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u_long v;
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} memguard;
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struct {
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void *slab;
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void *zone;
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} uma;
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} plinks;
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TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */
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vm_object_t object; /* which object am I in (O) */
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vm_pindex_t pindex; /* offset into object (O,P) */
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vm_paddr_t phys_addr; /* physical address of page (C) */
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struct md_page md; /* machine dependent stuff */
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u_int ref_count; /* page references (A) */
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u_int busy_lock; /* busy owners lock (A) */
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union vm_page_astate a; /* state accessed atomically (A) */
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uint8_t order; /* index of the buddy queue (F) */
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uint8_t pool; /* vm_phys freepool index (F) */
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uint8_t flags; /* page PG_* flags (P) */
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uint8_t oflags; /* page VPO_* flags (O) */
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int8_t psind; /* pagesizes[] index (O) */
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int8_t segind; /* vm_phys segment index (C) */
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/* NOTE that these must support one bit per DEV_BSIZE in a page */
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/* so, on normal X86 kernels, they must be at least 8 bits wide */
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vm_page_bits_t valid; /* valid DEV_BSIZE chunk map (O,B) */
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vm_page_bits_t dirty; /* dirty DEV_BSIZE chunk map (M,B) */
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};
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/*
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* Special bits used in the ref_count field.
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*
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* ref_count is normally used to count wirings that prevent the page from being
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* reclaimed, but also supports several special types of references that do not
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* prevent reclamation. Accesses to the ref_count field must be atomic unless
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* the page is unallocated.
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*
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* VPRC_OBJREF is the reference held by the containing object. It can set or
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* cleared only when the corresponding object's write lock is held.
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*
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* VPRC_BLOCKED is used to atomically block wirings via pmap lookups while
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* attempting to tear down all mappings of a given page. The page busy lock and
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* object write lock must both be held in order to set or clear this bit.
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*/
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#define VPRC_BLOCKED 0x40000000u /* mappings are being removed */
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#define VPRC_OBJREF 0x80000000u /* object reference, cleared with (O) */
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#define VPRC_WIRE_COUNT(c) ((c) & ~(VPRC_BLOCKED | VPRC_OBJREF))
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#define VPRC_WIRE_COUNT_MAX (~(VPRC_BLOCKED | VPRC_OBJREF))
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/*
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* Page flags stored in oflags:
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*
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* Access to these page flags is synchronized by the lock on the object
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* containing the page (O).
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*
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* Note: VPO_UNMANAGED (used by OBJT_DEVICE, OBJT_PHYS and OBJT_SG)
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* indicates that the page is not under PV management but
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* otherwise should be treated as a normal page. Pages not
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* under PV management cannot be paged out via the
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* object/vm_page_t because there is no knowledge of their pte
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* mappings, and such pages are also not on any PQ queue.
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*
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*/
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#define VPO_KMEM_EXEC 0x01 /* kmem mapping allows execution */
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#define VPO_SWAPSLEEP 0x02 /* waiting for swap to finish */
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#define VPO_UNMANAGED 0x04 /* no PV management for page */
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#define VPO_SWAPINPROG 0x08 /* swap I/O in progress on page */
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/*
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* Busy page implementation details.
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* The algorithm is taken mostly by rwlock(9) and sx(9) locks implementation,
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* even if the support for owner identity is removed because of size
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* constraints. Checks on lock recursion are then not possible, while the
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* lock assertions effectiveness is someway reduced.
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*/
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#define VPB_BIT_SHARED 0x01
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#define VPB_BIT_EXCLUSIVE 0x02
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#define VPB_BIT_WAITERS 0x04
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#define VPB_BIT_FLAGMASK \
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(VPB_BIT_SHARED | VPB_BIT_EXCLUSIVE | VPB_BIT_WAITERS)
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#define VPB_SHARERS_SHIFT 3
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#define VPB_SHARERS(x) \
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(((x) & ~VPB_BIT_FLAGMASK) >> VPB_SHARERS_SHIFT)
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#define VPB_SHARERS_WORD(x) ((x) << VPB_SHARERS_SHIFT | VPB_BIT_SHARED)
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#define VPB_ONE_SHARER (1 << VPB_SHARERS_SHIFT)
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#define VPB_SINGLE_EXCLUSIVE VPB_BIT_EXCLUSIVE
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#ifdef INVARIANTS
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#define VPB_CURTHREAD_EXCLUSIVE \
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(VPB_BIT_EXCLUSIVE | ((u_int)(uintptr_t)curthread & ~VPB_BIT_FLAGMASK))
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#else
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#define VPB_CURTHREAD_EXCLUSIVE VPB_SINGLE_EXCLUSIVE
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#endif
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#define VPB_UNBUSIED VPB_SHARERS_WORD(0)
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/* Freed lock blocks both shared and exclusive. */
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#define VPB_FREED (0xffffffff - VPB_BIT_SHARED)
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#define PQ_NONE 255
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#define PQ_INACTIVE 0
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#define PQ_ACTIVE 1
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#define PQ_LAUNDRY 2
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#define PQ_UNSWAPPABLE 3
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#define PQ_COUNT 4
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#ifndef VM_PAGE_HAVE_PGLIST
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TAILQ_HEAD(pglist, vm_page);
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#define VM_PAGE_HAVE_PGLIST
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#endif
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SLIST_HEAD(spglist, vm_page);
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#ifdef _KERNEL
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extern vm_page_t bogus_page;
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#endif /* _KERNEL */
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extern struct mtx_padalign pa_lock[];
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#if defined(__arm__)
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#define PDRSHIFT PDR_SHIFT
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#elif !defined(PDRSHIFT)
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#define PDRSHIFT 21
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#endif
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#define pa_index(pa) ((pa) >> PDRSHIFT)
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#define PA_LOCKPTR(pa) ((struct mtx *)(&pa_lock[pa_index(pa) % PA_LOCK_COUNT]))
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#define PA_LOCKOBJPTR(pa) ((struct lock_object *)PA_LOCKPTR((pa)))
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#define PA_LOCK(pa) mtx_lock(PA_LOCKPTR(pa))
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#define PA_TRYLOCK(pa) mtx_trylock(PA_LOCKPTR(pa))
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#define PA_UNLOCK(pa) mtx_unlock(PA_LOCKPTR(pa))
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#define PA_UNLOCK_COND(pa) \
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do { \
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if ((pa) != 0) { \
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PA_UNLOCK((pa)); \
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(pa) = 0; \
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} \
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} while (0)
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#define PA_LOCK_ASSERT(pa, a) mtx_assert(PA_LOCKPTR(pa), (a))
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#if defined(KLD_MODULE) && !defined(KLD_TIED)
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#define vm_page_lock(m) vm_page_lock_KBI((m), LOCK_FILE, LOCK_LINE)
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#define vm_page_unlock(m) vm_page_unlock_KBI((m), LOCK_FILE, LOCK_LINE)
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#define vm_page_trylock(m) vm_page_trylock_KBI((m), LOCK_FILE, LOCK_LINE)
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#else /* !KLD_MODULE */
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#define vm_page_lockptr(m) (PA_LOCKPTR(VM_PAGE_TO_PHYS((m))))
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#define vm_page_lock(m) mtx_lock(vm_page_lockptr((m)))
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#define vm_page_unlock(m) mtx_unlock(vm_page_lockptr((m)))
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#define vm_page_trylock(m) mtx_trylock(vm_page_lockptr((m)))
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#endif
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#if defined(INVARIANTS)
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#define vm_page_assert_locked(m) \
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vm_page_assert_locked_KBI((m), __FILE__, __LINE__)
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#define vm_page_lock_assert(m, a) \
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vm_page_lock_assert_KBI((m), (a), __FILE__, __LINE__)
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#else
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#define vm_page_assert_locked(m)
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#define vm_page_lock_assert(m, a)
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#endif
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/*
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* The vm_page's aflags are updated using atomic operations. To set or clear
|
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* these flags, the functions vm_page_aflag_set() and vm_page_aflag_clear()
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* must be used. Neither these flags nor these functions are part of the KBI.
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*
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* PGA_REFERENCED may be cleared only if the page is locked. It is set by
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* both the MI and MD VM layers. However, kernel loadable modules should not
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* directly set this flag. They should call vm_page_reference() instead.
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*
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* PGA_WRITEABLE is set exclusively on managed pages by pmap_enter().
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* When it does so, the object must be locked, or the page must be
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* exclusive busied. The MI VM layer must never access this flag
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* directly. Instead, it should call pmap_page_is_write_mapped().
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*
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* PGA_EXECUTABLE may be set by pmap routines, and indicates that a page has
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* at least one executable mapping. It is not consumed by the MI VM layer.
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*
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* PGA_NOSYNC must be set and cleared with the page busy lock held.
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*
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* PGA_ENQUEUED is set and cleared when a page is inserted into or removed
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* from a page queue, respectively. It determines whether the plinks.q field
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* of the page is valid. To set or clear this flag, page's "queue" field must
|
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* be a valid queue index, and the corresponding page queue lock must be held.
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*
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* PGA_DEQUEUE is set when the page is scheduled to be dequeued from a page
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* queue, and cleared when the dequeue request is processed. A page may
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* have PGA_DEQUEUE set and PGA_ENQUEUED cleared, for instance if a dequeue
|
|
* is requested after the page is scheduled to be enqueued but before it is
|
|
* actually inserted into the page queue.
|
|
*
|
|
* PGA_REQUEUE is set when the page is scheduled to be enqueued or requeued
|
|
* in its page queue.
|
|
*
|
|
* PGA_REQUEUE_HEAD is a special flag for enqueuing pages near the head of
|
|
* the inactive queue, thus bypassing LRU.
|
|
*
|
|
* The PGA_DEQUEUE, PGA_REQUEUE and PGA_REQUEUE_HEAD flags must be set using an
|
|
* atomic RMW operation to ensure that the "queue" field is a valid queue index,
|
|
* and the corresponding page queue lock must be held when clearing any of the
|
|
* flags.
|
|
*
|
|
* PGA_SWAP_FREE is used to defer freeing swap space to the pageout daemon
|
|
* when the context that dirties the page does not have the object write lock
|
|
* held.
|
|
*/
|
|
#define PGA_WRITEABLE 0x0001 /* page may be mapped writeable */
|
|
#define PGA_REFERENCED 0x0002 /* page has been referenced */
|
|
#define PGA_EXECUTABLE 0x0004 /* page may be mapped executable */
|
|
#define PGA_ENQUEUED 0x0008 /* page is enqueued in a page queue */
|
|
#define PGA_DEQUEUE 0x0010 /* page is due to be dequeued */
|
|
#define PGA_REQUEUE 0x0020 /* page is due to be requeued */
|
|
#define PGA_REQUEUE_HEAD 0x0040 /* page requeue should bypass LRU */
|
|
#define PGA_NOSYNC 0x0080 /* do not collect for syncer */
|
|
#define PGA_SWAP_FREE 0x0100 /* page with swap space was dirtied */
|
|
#define PGA_SWAP_SPACE 0x0200 /* page has allocated swap space */
|
|
|
|
#define PGA_QUEUE_OP_MASK (PGA_DEQUEUE | PGA_REQUEUE | PGA_REQUEUE_HEAD)
|
|
#define PGA_QUEUE_STATE_MASK (PGA_ENQUEUED | PGA_QUEUE_OP_MASK)
|
|
|
|
/*
|
|
* Page flags. Updates to these flags are not synchronized, and thus they must
|
|
* be set during page allocation or free to avoid races.
|
|
*
|
|
* The PG_PCPU_CACHE flag is set at allocation time if the page was
|
|
* allocated from a per-CPU cache. It is cleared the next time that the
|
|
* page is allocated from the physical memory allocator.
|
|
*/
|
|
#define PG_PCPU_CACHE 0x01 /* was allocated from per-CPU caches */
|
|
#define PG_FICTITIOUS 0x02 /* physical page doesn't exist */
|
|
#define PG_ZERO 0x04 /* page is zeroed */
|
|
#define PG_MARKER 0x08 /* special queue marker page */
|
|
#define PG_NODUMP 0x10 /* don't include this page in a dump */
|
|
|
|
/*
|
|
* Misc constants.
|
|
*/
|
|
#define ACT_DECLINE 1
|
|
#define ACT_ADVANCE 3
|
|
#define ACT_INIT 5
|
|
#define ACT_MAX 64
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#include <sys/kassert.h>
|
|
#include <machine/atomic.h>
|
|
|
|
/*
|
|
* Each pageable resident page falls into one of five lists:
|
|
*
|
|
* free
|
|
* Available for allocation now.
|
|
*
|
|
* inactive
|
|
* Low activity, candidates for reclamation.
|
|
* This list is approximately LRU ordered.
|
|
*
|
|
* laundry
|
|
* This is the list of pages that should be
|
|
* paged out next.
|
|
*
|
|
* unswappable
|
|
* Dirty anonymous pages that cannot be paged
|
|
* out because no swap device is configured.
|
|
*
|
|
* active
|
|
* Pages that are "active", i.e., they have been
|
|
* recently referenced.
|
|
*
|
|
*/
|
|
|
|
extern vm_page_t vm_page_array; /* First resident page in table */
|
|
extern long vm_page_array_size; /* number of vm_page_t's */
|
|
extern long first_page; /* first physical page number */
|
|
|
|
#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
|
|
|
|
/*
|
|
* PHYS_TO_VM_PAGE() returns the vm_page_t object that represents a memory
|
|
* page to which the given physical address belongs. The correct vm_page_t
|
|
* object is returned for addresses that are not page-aligned.
|
|
*/
|
|
vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
|
|
|
|
/*
|
|
* Page allocation parameters for vm_page for the functions
|
|
* vm_page_alloc(), vm_page_grab(), vm_page_alloc_contig() and
|
|
* vm_page_alloc_freelist(). Some functions support only a subset
|
|
* of the flags, and ignore others, see the flags legend.
|
|
*
|
|
* The meaning of VM_ALLOC_ZERO differs slightly between the vm_page_alloc*()
|
|
* and the vm_page_grab*() functions. See these functions for details.
|
|
*
|
|
* Bits 0 - 1 define class.
|
|
* Bits 2 - 15 dedicated for flags.
|
|
* Legend:
|
|
* (a) - vm_page_alloc() supports the flag.
|
|
* (c) - vm_page_alloc_contig() supports the flag.
|
|
* (g) - vm_page_grab() supports the flag.
|
|
* (n) - vm_page_alloc_noobj() and vm_page_alloc_freelist() support the flag.
|
|
* (p) - vm_page_grab_pages() supports the flag.
|
|
* Bits above 15 define the count of additional pages that the caller
|
|
* intends to allocate.
|
|
*/
|
|
#define VM_ALLOC_NORMAL 0
|
|
#define VM_ALLOC_INTERRUPT 1
|
|
#define VM_ALLOC_SYSTEM 2
|
|
#define VM_ALLOC_CLASS_MASK 3
|
|
#define VM_ALLOC_WAITOK 0x0008 /* (acn) Sleep and retry */
|
|
#define VM_ALLOC_WAITFAIL 0x0010 /* (acn) Sleep and return error */
|
|
#define VM_ALLOC_WIRED 0x0020 /* (acgnp) Allocate a wired page */
|
|
#define VM_ALLOC_ZERO 0x0040 /* (acgnp) Allocate a zeroed page */
|
|
#define VM_ALLOC_NORECLAIM 0x0080 /* (c) Do not reclaim after failure */
|
|
#define VM_ALLOC_AVAIL0 0x0100
|
|
#define VM_ALLOC_NOBUSY 0x0200 /* (acgp) Do not excl busy the page */
|
|
#define VM_ALLOC_NOCREAT 0x0400 /* (gp) Don't create a page */
|
|
#define VM_ALLOC_AVAIL1 0x0800
|
|
#define VM_ALLOC_IGN_SBUSY 0x1000 /* (gp) Ignore shared busy flag */
|
|
#define VM_ALLOC_NODUMP 0x2000 /* (ag) don't include in dump */
|
|
#define VM_ALLOC_SBUSY 0x4000 /* (acgp) Shared busy the page */
|
|
#define VM_ALLOC_NOWAIT 0x8000 /* (acgnp) Do not sleep */
|
|
#define VM_ALLOC_COUNT_MAX 0xffff
|
|
#define VM_ALLOC_COUNT_SHIFT 16
|
|
#define VM_ALLOC_COUNT_MASK (VM_ALLOC_COUNT(VM_ALLOC_COUNT_MAX))
|
|
#define VM_ALLOC_COUNT(count) ({ \
|
|
KASSERT((count) <= VM_ALLOC_COUNT_MAX, \
|
|
("%s: invalid VM_ALLOC_COUNT value", __func__)); \
|
|
(count) << VM_ALLOC_COUNT_SHIFT; \
|
|
})
|
|
|
|
#ifdef M_NOWAIT
|
|
static inline int
|
|
malloc2vm_flags(int malloc_flags)
|
|
{
|
|
int pflags;
|
|
|
|
KASSERT((malloc_flags & M_USE_RESERVE) == 0 ||
|
|
(malloc_flags & M_NOWAIT) != 0,
|
|
("M_USE_RESERVE requires M_NOWAIT"));
|
|
pflags = (malloc_flags & M_USE_RESERVE) != 0 ? VM_ALLOC_INTERRUPT :
|
|
VM_ALLOC_SYSTEM;
|
|
if ((malloc_flags & M_ZERO) != 0)
|
|
pflags |= VM_ALLOC_ZERO;
|
|
if ((malloc_flags & M_NODUMP) != 0)
|
|
pflags |= VM_ALLOC_NODUMP;
|
|
if ((malloc_flags & M_NOWAIT))
|
|
pflags |= VM_ALLOC_NOWAIT;
|
|
if ((malloc_flags & M_WAITOK))
|
|
pflags |= VM_ALLOC_WAITOK;
|
|
if ((malloc_flags & M_NORECLAIM))
|
|
pflags |= VM_ALLOC_NORECLAIM;
|
|
return (pflags);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Predicates supported by vm_page_ps_test():
|
|
*
|
|
* PS_ALL_DIRTY is true only if the entire (super)page is dirty.
|
|
* However, it can be spuriously false when the (super)page has become
|
|
* dirty in the pmap but that information has not been propagated to the
|
|
* machine-independent layer.
|
|
*/
|
|
#define PS_ALL_DIRTY 0x1
|
|
#define PS_ALL_VALID 0x2
|
|
#define PS_NONE_BUSY 0x4
|
|
|
|
bool vm_page_busy_acquire(vm_page_t m, int allocflags);
|
|
void vm_page_busy_downgrade(vm_page_t m);
|
|
int vm_page_busy_tryupgrade(vm_page_t m);
|
|
bool vm_page_busy_sleep(vm_page_t m, const char *msg, int allocflags);
|
|
void vm_page_busy_sleep_unlocked(vm_object_t obj, vm_page_t m,
|
|
vm_pindex_t pindex, const char *wmesg, int allocflags);
|
|
void vm_page_free(vm_page_t m);
|
|
void vm_page_free_zero(vm_page_t m);
|
|
|
|
void vm_page_activate (vm_page_t);
|
|
void vm_page_advise(vm_page_t m, int advice);
|
|
vm_page_t vm_page_alloc(vm_object_t, vm_pindex_t, int);
|
|
vm_page_t vm_page_alloc_domain(vm_object_t, vm_pindex_t, int, int);
|
|
vm_page_t vm_page_alloc_after(vm_object_t, vm_pindex_t, int, vm_page_t);
|
|
vm_page_t vm_page_alloc_domain_after(vm_object_t, vm_pindex_t, int, int,
|
|
vm_page_t);
|
|
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);
|
|
vm_page_t vm_page_alloc_contig_domain(vm_object_t object,
|
|
vm_pindex_t pindex, int domain, int req, u_long npages, vm_paddr_t low,
|
|
vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
|
|
vm_memattr_t memattr);
|
|
vm_page_t vm_page_alloc_freelist(int, int);
|
|
vm_page_t vm_page_alloc_freelist_domain(int, int, int);
|
|
vm_page_t vm_page_alloc_noobj(int);
|
|
vm_page_t vm_page_alloc_noobj_domain(int, int);
|
|
vm_page_t vm_page_alloc_noobj_contig(int req, u_long npages, vm_paddr_t low,
|
|
vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
|
|
vm_memattr_t memattr);
|
|
vm_page_t vm_page_alloc_noobj_contig_domain(int domain, int req, u_long npages,
|
|
vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
|
|
vm_memattr_t memattr);
|
|
void vm_page_bits_set(vm_page_t m, vm_page_bits_t *bits, vm_page_bits_t set);
|
|
bool vm_page_blacklist_add(vm_paddr_t pa, bool verbose);
|
|
vm_page_t vm_page_grab(vm_object_t, vm_pindex_t, int);
|
|
vm_page_t vm_page_grab_unlocked(vm_object_t, vm_pindex_t, int);
|
|
int vm_page_grab_pages(vm_object_t object, vm_pindex_t pindex, int allocflags,
|
|
vm_page_t *ma, int count);
|
|
int vm_page_grab_pages_unlocked(vm_object_t object, vm_pindex_t pindex,
|
|
int allocflags, vm_page_t *ma, int count);
|
|
int vm_page_grab_valid(vm_page_t *mp, vm_object_t object, vm_pindex_t pindex,
|
|
int allocflags);
|
|
int vm_page_grab_valid_unlocked(vm_page_t *mp, vm_object_t object,
|
|
vm_pindex_t pindex, int allocflags);
|
|
void vm_page_deactivate(vm_page_t);
|
|
void vm_page_deactivate_noreuse(vm_page_t);
|
|
void vm_page_dequeue(vm_page_t m);
|
|
void vm_page_dequeue_deferred(vm_page_t m);
|
|
vm_page_t vm_page_find_least(vm_object_t, vm_pindex_t);
|
|
void vm_page_free_invalid(vm_page_t);
|
|
vm_page_t vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr);
|
|
void vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
|
|
void vm_page_init_marker(vm_page_t marker, int queue, uint16_t aflags);
|
|
void vm_page_init_page(vm_page_t m, vm_paddr_t pa, int segind);
|
|
int vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t);
|
|
void vm_page_invalid(vm_page_t m);
|
|
void vm_page_launder(vm_page_t m);
|
|
vm_page_t vm_page_lookup(vm_object_t, vm_pindex_t);
|
|
vm_page_t vm_page_lookup_unlocked(vm_object_t, vm_pindex_t);
|
|
vm_page_t vm_page_next(vm_page_t m);
|
|
void vm_page_pqbatch_drain(void);
|
|
void vm_page_pqbatch_submit(vm_page_t m, uint8_t queue);
|
|
bool vm_page_pqstate_commit(vm_page_t m, vm_page_astate_t *old,
|
|
vm_page_astate_t new);
|
|
vm_page_t vm_page_prev(vm_page_t m);
|
|
bool vm_page_ps_test(vm_page_t m, int flags, vm_page_t skip_m);
|
|
void vm_page_putfake(vm_page_t m);
|
|
void vm_page_readahead_finish(vm_page_t m);
|
|
bool vm_page_reclaim_contig(int req, u_long npages, vm_paddr_t low,
|
|
vm_paddr_t high, u_long alignment, vm_paddr_t boundary);
|
|
bool vm_page_reclaim_contig_domain(int domain, int req, u_long npages,
|
|
vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary);
|
|
void vm_page_reference(vm_page_t m);
|
|
#define VPR_TRYFREE 0x01
|
|
#define VPR_NOREUSE 0x02
|
|
void vm_page_release(vm_page_t m, int flags);
|
|
void vm_page_release_locked(vm_page_t m, int flags);
|
|
vm_page_t vm_page_relookup(vm_object_t, vm_pindex_t);
|
|
bool vm_page_remove(vm_page_t);
|
|
bool vm_page_remove_xbusy(vm_page_t);
|
|
int vm_page_rename(vm_page_t, vm_object_t, vm_pindex_t);
|
|
void vm_page_replace(vm_page_t mnew, vm_object_t object,
|
|
vm_pindex_t pindex, vm_page_t mold);
|
|
int vm_page_sbusied(vm_page_t m);
|
|
vm_page_t vm_page_scan_contig(u_long npages, vm_page_t m_start,
|
|
vm_page_t m_end, u_long alignment, vm_paddr_t boundary, int options);
|
|
vm_page_bits_t vm_page_set_dirty(vm_page_t m);
|
|
void vm_page_set_valid_range(vm_page_t m, int base, int size);
|
|
vm_offset_t vm_page_startup(vm_offset_t vaddr);
|
|
void vm_page_sunbusy(vm_page_t m);
|
|
bool vm_page_try_remove_all(vm_page_t m);
|
|
bool vm_page_try_remove_write(vm_page_t m);
|
|
int vm_page_trysbusy(vm_page_t m);
|
|
int vm_page_tryxbusy(vm_page_t m);
|
|
void vm_page_unhold_pages(vm_page_t *ma, int count);
|
|
void vm_page_unswappable(vm_page_t m);
|
|
void vm_page_unwire(vm_page_t m, uint8_t queue);
|
|
bool vm_page_unwire_noq(vm_page_t m);
|
|
void vm_page_updatefake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr);
|
|
void vm_page_wire(vm_page_t);
|
|
bool vm_page_wire_mapped(vm_page_t m);
|
|
void vm_page_xunbusy_hard(vm_page_t m);
|
|
void vm_page_xunbusy_hard_unchecked(vm_page_t m);
|
|
void vm_page_set_validclean (vm_page_t, int, int);
|
|
void vm_page_clear_dirty(vm_page_t, int, int);
|
|
void vm_page_set_invalid(vm_page_t, int, int);
|
|
void vm_page_valid(vm_page_t m);
|
|
int vm_page_is_valid(vm_page_t, int, int);
|
|
void vm_page_test_dirty(vm_page_t);
|
|
vm_page_bits_t vm_page_bits(int base, int size);
|
|
void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid);
|
|
void vm_page_free_pages_toq(struct spglist *free, bool update_wire_count);
|
|
|
|
void vm_page_dirty_KBI(vm_page_t m);
|
|
void vm_page_lock_KBI(vm_page_t m, const char *file, int line);
|
|
void vm_page_unlock_KBI(vm_page_t m, const char *file, int line);
|
|
int vm_page_trylock_KBI(vm_page_t m, const char *file, int line);
|
|
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
|
|
void vm_page_assert_locked_KBI(vm_page_t m, const char *file, int line);
|
|
void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line);
|
|
#endif
|
|
|
|
#define vm_page_busy_fetch(m) atomic_load_int(&(m)->busy_lock)
|
|
|
|
#define vm_page_assert_busied(m) \
|
|
KASSERT(vm_page_busied(m), \
|
|
("vm_page_assert_busied: page %p not busy @ %s:%d", \
|
|
(m), __FILE__, __LINE__))
|
|
|
|
#define vm_page_assert_sbusied(m) \
|
|
KASSERT(vm_page_sbusied(m), \
|
|
("vm_page_assert_sbusied: page %p not shared busy @ %s:%d", \
|
|
(m), __FILE__, __LINE__))
|
|
|
|
#define vm_page_assert_unbusied(m) \
|
|
KASSERT((vm_page_busy_fetch(m) & ~VPB_BIT_WAITERS) != \
|
|
VPB_CURTHREAD_EXCLUSIVE, \
|
|
("vm_page_assert_xbusied: page %p busy_lock %#x owned" \
|
|
" by me @ %s:%d", \
|
|
(m), (m)->busy_lock, __FILE__, __LINE__)); \
|
|
|
|
#define vm_page_assert_xbusied_unchecked(m) do { \
|
|
KASSERT(vm_page_xbusied(m), \
|
|
("vm_page_assert_xbusied: page %p not exclusive busy @ %s:%d", \
|
|
(m), __FILE__, __LINE__)); \
|
|
} while (0)
|
|
#define vm_page_assert_xbusied(m) do { \
|
|
vm_page_assert_xbusied_unchecked(m); \
|
|
KASSERT((vm_page_busy_fetch(m) & ~VPB_BIT_WAITERS) == \
|
|
VPB_CURTHREAD_EXCLUSIVE, \
|
|
("vm_page_assert_xbusied: page %p busy_lock %#x not owned" \
|
|
" by me @ %s:%d", \
|
|
(m), (m)->busy_lock, __FILE__, __LINE__)); \
|
|
} while (0)
|
|
|
|
#define vm_page_busied(m) \
|
|
(vm_page_busy_fetch(m) != VPB_UNBUSIED)
|
|
|
|
#define vm_page_xbusied(m) \
|
|
((vm_page_busy_fetch(m) & VPB_SINGLE_EXCLUSIVE) != 0)
|
|
|
|
#define vm_page_busy_freed(m) \
|
|
(vm_page_busy_fetch(m) == VPB_FREED)
|
|
|
|
/* Note: page m's lock must not be owned by the caller. */
|
|
#define vm_page_xunbusy(m) do { \
|
|
if (!atomic_cmpset_rel_int(&(m)->busy_lock, \
|
|
VPB_CURTHREAD_EXCLUSIVE, VPB_UNBUSIED)) \
|
|
vm_page_xunbusy_hard(m); \
|
|
} while (0)
|
|
#define vm_page_xunbusy_unchecked(m) do { \
|
|
if (!atomic_cmpset_rel_int(&(m)->busy_lock, \
|
|
VPB_CURTHREAD_EXCLUSIVE, VPB_UNBUSIED)) \
|
|
vm_page_xunbusy_hard_unchecked(m); \
|
|
} while (0)
|
|
|
|
#ifdef INVARIANTS
|
|
void vm_page_object_busy_assert(vm_page_t m);
|
|
#define VM_PAGE_OBJECT_BUSY_ASSERT(m) vm_page_object_busy_assert(m)
|
|
void vm_page_assert_pga_writeable(vm_page_t m, uint16_t bits);
|
|
#define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits) \
|
|
vm_page_assert_pga_writeable(m, bits)
|
|
/*
|
|
* Claim ownership of a page's xbusy state. In non-INVARIANTS kernels this
|
|
* operation is a no-op since ownership is not tracked. In particular
|
|
* this macro does not provide any synchronization with the previous owner.
|
|
*/
|
|
#define vm_page_xbusy_claim(m) do { \
|
|
u_int _busy_lock; \
|
|
\
|
|
vm_page_assert_xbusied_unchecked((m)); \
|
|
do { \
|
|
_busy_lock = vm_page_busy_fetch(m); \
|
|
} while (!atomic_cmpset_int(&(m)->busy_lock, _busy_lock, \
|
|
(_busy_lock & VPB_BIT_FLAGMASK) | VPB_CURTHREAD_EXCLUSIVE)); \
|
|
} while (0)
|
|
#else
|
|
#define VM_PAGE_OBJECT_BUSY_ASSERT(m) (void)0
|
|
#define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits) (void)0
|
|
#define vm_page_xbusy_claim(m)
|
|
#endif
|
|
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
#define VM_PAGE_AFLAG_SHIFT 16
|
|
#else
|
|
#define VM_PAGE_AFLAG_SHIFT 0
|
|
#endif
|
|
|
|
/*
|
|
* Load a snapshot of a page's 32-bit atomic state.
|
|
*/
|
|
static inline vm_page_astate_t
|
|
vm_page_astate_load(vm_page_t m)
|
|
{
|
|
vm_page_astate_t a;
|
|
|
|
a._bits = atomic_load_32(&m->a._bits);
|
|
return (a);
|
|
}
|
|
|
|
/*
|
|
* Atomically compare and set a page's atomic state.
|
|
*/
|
|
static inline bool
|
|
vm_page_astate_fcmpset(vm_page_t m, vm_page_astate_t *old, vm_page_astate_t new)
|
|
{
|
|
|
|
KASSERT(new.queue == PQ_INACTIVE || (new.flags & PGA_REQUEUE_HEAD) == 0,
|
|
("%s: invalid head requeue request for page %p", __func__, m));
|
|
KASSERT((new.flags & PGA_ENQUEUED) == 0 || new.queue != PQ_NONE,
|
|
("%s: setting PGA_ENQUEUED with PQ_NONE in page %p", __func__, m));
|
|
KASSERT(new._bits != old->_bits,
|
|
("%s: bits are unchanged", __func__));
|
|
|
|
return (atomic_fcmpset_32(&m->a._bits, &old->_bits, new._bits) != 0);
|
|
}
|
|
|
|
/*
|
|
* Clear the given bits in the specified page.
|
|
*/
|
|
static inline void
|
|
vm_page_aflag_clear(vm_page_t m, uint16_t bits)
|
|
{
|
|
uint32_t *addr, val;
|
|
|
|
/*
|
|
* Access the whole 32-bit word containing the aflags field with an
|
|
* atomic update. Parallel non-atomic updates to the other fields
|
|
* within this word are handled properly by the atomic update.
|
|
*/
|
|
addr = (void *)&m->a;
|
|
val = bits << VM_PAGE_AFLAG_SHIFT;
|
|
atomic_clear_32(addr, val);
|
|
}
|
|
|
|
/*
|
|
* Set the given bits in the specified page.
|
|
*/
|
|
static inline void
|
|
vm_page_aflag_set(vm_page_t m, uint16_t bits)
|
|
{
|
|
uint32_t *addr, val;
|
|
|
|
VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits);
|
|
|
|
/*
|
|
* Access the whole 32-bit word containing the aflags field with an
|
|
* atomic update. Parallel non-atomic updates to the other fields
|
|
* within this word are handled properly by the atomic update.
|
|
*/
|
|
addr = (void *)&m->a;
|
|
val = bits << VM_PAGE_AFLAG_SHIFT;
|
|
atomic_set_32(addr, val);
|
|
}
|
|
|
|
/*
|
|
* vm_page_dirty:
|
|
*
|
|
* 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().
|
|
*/
|
|
static __inline void
|
|
vm_page_dirty(vm_page_t m)
|
|
{
|
|
|
|
/* Use vm_page_dirty_KBI() under INVARIANTS to save memory. */
|
|
#if (defined(KLD_MODULE) && !defined(KLD_TIED)) || defined(INVARIANTS)
|
|
vm_page_dirty_KBI(m);
|
|
#else
|
|
m->dirty = VM_PAGE_BITS_ALL;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* vm_page_undirty:
|
|
*
|
|
* Set page to not be dirty. Note: does not clear pmap modify bits
|
|
*/
|
|
static __inline void
|
|
vm_page_undirty(vm_page_t m)
|
|
{
|
|
|
|
VM_PAGE_OBJECT_BUSY_ASSERT(m);
|
|
m->dirty = 0;
|
|
}
|
|
|
|
static inline uint8_t
|
|
_vm_page_queue(vm_page_astate_t as)
|
|
{
|
|
|
|
if ((as.flags & PGA_DEQUEUE) != 0)
|
|
return (PQ_NONE);
|
|
return (as.queue);
|
|
}
|
|
|
|
/*
|
|
* vm_page_queue:
|
|
*
|
|
* Return the index of the queue containing m.
|
|
*/
|
|
static inline uint8_t
|
|
vm_page_queue(vm_page_t m)
|
|
{
|
|
|
|
return (_vm_page_queue(vm_page_astate_load(m)));
|
|
}
|
|
|
|
static inline bool
|
|
vm_page_active(vm_page_t m)
|
|
{
|
|
|
|
return (vm_page_queue(m) == PQ_ACTIVE);
|
|
}
|
|
|
|
static inline bool
|
|
vm_page_inactive(vm_page_t m)
|
|
{
|
|
|
|
return (vm_page_queue(m) == PQ_INACTIVE);
|
|
}
|
|
|
|
static inline bool
|
|
vm_page_in_laundry(vm_page_t m)
|
|
{
|
|
uint8_t queue;
|
|
|
|
queue = vm_page_queue(m);
|
|
return (queue == PQ_LAUNDRY || queue == PQ_UNSWAPPABLE);
|
|
}
|
|
|
|
/*
|
|
* vm_page_drop:
|
|
*
|
|
* Release a reference to a page and return the old reference count.
|
|
*/
|
|
static inline u_int
|
|
vm_page_drop(vm_page_t m, u_int val)
|
|
{
|
|
u_int old;
|
|
|
|
/*
|
|
* Synchronize with vm_page_free_prep(): ensure that all updates to the
|
|
* page structure are visible before it is freed.
|
|
*/
|
|
atomic_thread_fence_rel();
|
|
old = atomic_fetchadd_int(&m->ref_count, -val);
|
|
KASSERT(old != VPRC_BLOCKED,
|
|
("vm_page_drop: page %p has an invalid refcount value", m));
|
|
return (old);
|
|
}
|
|
|
|
/*
|
|
* vm_page_wired:
|
|
*
|
|
* Perform a racy check to determine whether a reference prevents the page
|
|
* from being reclaimable. If the page's object is locked, and the page is
|
|
* unmapped and exclusively busied by the current thread, no new wirings
|
|
* may be created.
|
|
*/
|
|
static inline bool
|
|
vm_page_wired(vm_page_t m)
|
|
{
|
|
|
|
return (VPRC_WIRE_COUNT(m->ref_count) > 0);
|
|
}
|
|
|
|
static inline bool
|
|
vm_page_all_valid(vm_page_t m)
|
|
{
|
|
|
|
return (m->valid == VM_PAGE_BITS_ALL);
|
|
}
|
|
|
|
static inline bool
|
|
vm_page_any_valid(vm_page_t m)
|
|
{
|
|
|
|
return (m->valid != 0);
|
|
}
|
|
|
|
static inline bool
|
|
vm_page_none_valid(vm_page_t m)
|
|
{
|
|
|
|
return (m->valid == 0);
|
|
}
|
|
|
|
static inline int
|
|
vm_page_domain(vm_page_t m)
|
|
{
|
|
#ifdef NUMA
|
|
int domn, segind;
|
|
|
|
segind = m->segind;
|
|
KASSERT(segind < vm_phys_nsegs, ("segind %d m %p", segind, m));
|
|
domn = vm_phys_segs[segind].domain;
|
|
KASSERT(domn >= 0 && domn < vm_ndomains, ("domain %d m %p", domn, m));
|
|
return (domn);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_VM_PAGE_ */
|