630 lines
17 KiB
C
630 lines
17 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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.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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#if !defined(KLD_MODULE)
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#include "opt_vmpage.h"
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#endif
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#include <vm/pmap.h>
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#include <machine/atomic.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 lists:
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*
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* A hash table bucket 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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* Fields in this structure are locked either by the lock on the
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* object that the page belongs to (O) or by the lock on the page
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* queues (P).
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*
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* The 'valid' and 'dirty' fields are distinct. A page may have dirty
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* bits set without having associated valid bits set. This is used by
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* NFS to implement piecemeal writes.
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*/
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TAILQ_HEAD(pglist, vm_page);
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struct vm_page {
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TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO queue or free list (P) */
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struct vm_page *hnext; /* hash table link (O,P) */
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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,P)*/
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vm_pindex_t pindex; /* offset into object (O,P) */
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vm_offset_t phys_addr; /* physical address of page */
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struct md_page md; /* machine dependant stuff */
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u_short queue; /* page queue index */
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u_short flags, /* see below */
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pc; /* page color */
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u_short wire_count; /* wired down maps refs (P) */
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short hold_count; /* page hold count */
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u_char act_count; /* page usage count */
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u_char busy; /* page busy count */
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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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#if PAGE_SIZE == 4096
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u_char valid; /* map of valid DEV_BSIZE chunks */
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u_char dirty; /* map of dirty DEV_BSIZE chunks */
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#elif PAGE_SIZE == 8192
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u_short valid; /* map of valid DEV_BSIZE chunks */
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u_short dirty; /* map of dirty DEV_BSIZE chunks */
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#endif
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};
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/*
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* note: currently use SWAPBLK_NONE as an absolute value rather then
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* a flag bit.
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*/
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#define SWAPBLK_MASK ((daddr_t)((u_daddr_t)-1 >> 1)) /* mask */
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#define SWAPBLK_NONE ((daddr_t)((u_daddr_t)SWAPBLK_MASK + 1))/* flag */
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#if !defined(KLD_MODULE)
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/*
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* Page coloring parameters
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*/
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/* Each of PQ_FREE, and PQ_CACHE have PQ_HASH_SIZE entries */
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/* Backward compatibility for existing PQ_*CACHE config options. */
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#if !defined(PQ_CACHESIZE)
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#if defined(PQ_HUGECACHE)
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#define PQ_CACHESIZE 1024
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#elif defined(PQ_LARGECACHE)
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#define PQ_CACHESIZE 512
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#elif defined(PQ_MEDIUMCACHE)
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#define PQ_CACHESIZE 256
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#elif defined(PQ_NORMALCACHE)
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#define PQ_CACHESIZE 64
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#elif defined(PQ_NOOPT)
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#define PQ_CACHESIZE 0
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#else
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#define PQ_CACHESIZE 128
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#endif
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#endif
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#if PQ_CACHESIZE >= 1024
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#define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 256 /* A number of colors opt for 1M cache */
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#elif PQ_CACHESIZE >= 512
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#define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 128 /* A number of colors opt for 512K cache */
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#elif PQ_CACHESIZE >= 256
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#define PQ_PRIME1 13 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 7 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 64 /* A number of colors opt for 256K cache */
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#elif PQ_CACHESIZE >= 128
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#define PQ_PRIME1 9 /* Produces a good PQ_L2_SIZE/3 + PQ_PRIME1 */
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#define PQ_PRIME2 5 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 32 /* A number of colors opt for 128k cache */
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#elif PQ_CACHESIZE >= 64
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#define PQ_PRIME1 5 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_PRIME2 3 /* Prime number somewhat less than PQ_HASH_SIZE */
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#define PQ_L2_SIZE 16 /* A reasonable number of colors (opt for 64K cache) */
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#else
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#define PQ_PRIME1 1 /* Disable page coloring. */
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#define PQ_PRIME2 1
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#define PQ_L2_SIZE 1
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#endif
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#define PQ_L2_MASK (PQ_L2_SIZE - 1)
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#if 1
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#define PQ_NONE 0
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#define PQ_FREE 1
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#define PQ_INACTIVE (1 + 1*PQ_L2_SIZE)
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#define PQ_ACTIVE (2 + 1*PQ_L2_SIZE)
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#define PQ_CACHE (3 + 1*PQ_L2_SIZE)
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#define PQ_COUNT (3 + 2*PQ_L2_SIZE)
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#else
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#define PQ_NONE PQ_COUNT
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#define PQ_FREE 0
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#define PQ_INACTIVE PQ_L2_SIZE
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#define PQ_ACTIVE (1 + PQ_L2_SIZE)
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#define PQ_CACHE (2 + PQ_L2_SIZE)
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#define PQ_COUNT (2 + 2*PQ_L2_SIZE)
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#endif
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struct vpgqueues {
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struct pglist pl;
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int *cnt;
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int lcnt;
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};
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extern struct vpgqueues vm_page_queues[PQ_COUNT];
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#endif
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/*
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* These are the flags defined for vm_page.
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*
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* Note: PG_FILLED and PG_DIRTY are added for the filesystems.
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*
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* Note: PG_UNMANAGED (used by OBJT_PHYS) indicates that the page is
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* not under PV management but otherwise should be treated as a
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* normal page. Pages not under PV management cannot be paged out
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* via the object/vm_page_t because there is no knowledge of their
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* pte mappings, nor can they be removed from their objects via
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* the object, and such pages are also not on any PQ queue.
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*/
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#define PG_BUSY 0x0001 /* page is in transit (O) */
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#define PG_WANTED 0x0002 /* someone is waiting for page (O) */
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#define PG_FICTITIOUS 0x0008 /* physical page doesn't exist (O) */
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#define PG_WRITEABLE 0x0010 /* page is mapped writeable */
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#define PG_MAPPED 0x0020 /* page is mapped */
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#define PG_ZERO 0x0040 /* page is zeroed */
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#define PG_REFERENCED 0x0080 /* page has been referenced */
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#define PG_CLEANCHK 0x0100 /* page will be checked for cleaning */
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#define PG_SWAPINPROG 0x0200 /* swap I/O in progress on page */
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#define PG_NOSYNC 0x0400 /* do not collect for syncer */
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#define PG_UNMANAGED 0x0800 /* No PV management for page */
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/*
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* Misc constants.
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*/
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#define ACT_DECLINE 1
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#define ACT_ADVANCE 3
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#define ACT_INIT 5
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#define ACT_MAX 64
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#define PFCLUSTER_BEHIND 3
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#define PFCLUSTER_AHEAD 3
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#ifdef _KERNEL
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/*
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* Each pageable resident page falls into one of four lists:
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*
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* free
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* Available for allocation now.
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*
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* The following are all LRU sorted:
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*
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* cache
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* Almost available for allocation. Still in an
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* object, but clean and immediately freeable at
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* non-interrupt times.
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*
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* inactive
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* Low activity, candidates for reclamation.
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* This is the list of pages that should be
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* paged out next.
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*
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* active
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* Pages that are "active" i.e. they have been
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* recently referenced.
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*
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* zero
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* Pages that are really free and have been pre-zeroed
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*
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*/
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extern int vm_page_zero_count;
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extern vm_page_t vm_page_array; /* First resident page in table */
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extern int vm_page_array_size; /* number of vm_page_t's */
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extern long first_page; /* first physical page number */
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#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
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#define PHYS_TO_VM_PAGE(pa) \
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(&vm_page_array[atop(pa) - first_page ])
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/*
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* Functions implemented as macros
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*/
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static __inline void
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vm_page_flag_set(vm_page_t m, unsigned int bits)
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{
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atomic_set_short(&(m)->flags, bits);
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}
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static __inline void
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vm_page_flag_clear(vm_page_t m, unsigned int bits)
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{
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atomic_clear_short(&(m)->flags, bits);
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}
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#if 0
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static __inline void
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vm_page_assert_wait(vm_page_t m, int interruptible)
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{
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vm_page_flag_set(m, PG_WANTED);
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assert_wait((int) m, interruptible);
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}
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#endif
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static __inline void
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vm_page_busy(vm_page_t m)
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{
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KASSERT((m->flags & PG_BUSY) == 0, ("vm_page_busy: page already busy!!!"));
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vm_page_flag_set(m, PG_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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static __inline void
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vm_page_flash(vm_page_t m)
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{
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if (m->flags & PG_WANTED) {
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vm_page_flag_clear(m, PG_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 PG_BUSY flag and wakeup anyone waiting for the
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* page.
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*
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*/
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static __inline void
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vm_page_wakeup(vm_page_t m)
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{
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KASSERT(m->flags & PG_BUSY, ("vm_page_wakeup: page not busy!!!"));
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vm_page_flag_clear(m, PG_BUSY);
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vm_page_flash(m);
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}
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/*
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*
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*
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*/
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static __inline void
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vm_page_io_start(vm_page_t m)
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{
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atomic_add_char(&(m)->busy, 1);
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}
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static __inline void
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vm_page_io_finish(vm_page_t m)
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{
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atomic_subtract_char(&m->busy, 1);
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if (m->busy == 0)
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vm_page_flash(m);
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}
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#if PAGE_SIZE == 4096
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#define VM_PAGE_BITS_ALL 0xff
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#endif
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#if PAGE_SIZE == 8192
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#define VM_PAGE_BITS_ALL 0xffff
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#endif
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#define VM_ALLOC_NORMAL 0
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#define VM_ALLOC_INTERRUPT 1
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#define VM_ALLOC_SYSTEM 2
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#define VM_ALLOC_ZERO 3
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#define VM_ALLOC_RETRY 0x80
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void vm_page_activate __P((vm_page_t));
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vm_page_t vm_page_alloc __P((vm_object_t, vm_pindex_t, int));
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vm_page_t vm_page_grab __P((vm_object_t, vm_pindex_t, int));
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void vm_page_cache __P((register vm_page_t));
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void vm_page_dontneed __P((register vm_page_t));
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static __inline void vm_page_copy __P((vm_page_t, vm_page_t));
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static __inline void vm_page_free __P((vm_page_t));
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static __inline void vm_page_free_zero __P((vm_page_t));
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void vm_page_deactivate __P((vm_page_t));
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void vm_page_insert __P((vm_page_t, vm_object_t, vm_pindex_t));
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vm_page_t vm_page_lookup __P((vm_object_t, vm_pindex_t));
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void vm_page_remove __P((vm_page_t));
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void vm_page_rename __P((vm_page_t, vm_object_t, vm_pindex_t));
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vm_offset_t vm_page_startup __P((vm_offset_t, vm_offset_t, vm_offset_t));
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vm_page_t vm_add_new_page __P((vm_offset_t pa));
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void vm_page_unmanage __P((vm_page_t));
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void vm_page_unwire __P((vm_page_t, int));
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void vm_page_wire __P((vm_page_t));
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void vm_page_unqueue __P((vm_page_t));
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void vm_page_unqueue_nowakeup __P((vm_page_t));
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void vm_page_set_validclean __P((vm_page_t, int, int));
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void vm_page_set_dirty __P((vm_page_t, int, int));
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void vm_page_clear_dirty __P((vm_page_t, int, int));
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void vm_page_set_invalid __P((vm_page_t, int, int));
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static __inline boolean_t vm_page_zero_fill __P((vm_page_t));
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int vm_page_is_valid __P((vm_page_t, int, int));
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void vm_page_test_dirty __P((vm_page_t));
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int vm_page_bits __P((int, int));
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vm_page_t _vm_page_list_find __P((int, int));
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#if 0
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int vm_page_sleep(vm_page_t m, char *msg, char *busy);
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int vm_page_asleep(vm_page_t m, char *msg, char *busy);
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#endif
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void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid);
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void vm_page_free_toq(vm_page_t m);
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/*
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* Keep page from being freed by the page daemon
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* much of the same effect as wiring, except much lower
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* overhead and should be used only for *very* temporary
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* holding ("wiring").
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*/
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static __inline void
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vm_page_hold(vm_page_t mem)
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{
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mem->hold_count++;
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}
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static __inline void
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vm_page_unhold(vm_page_t mem)
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{
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--mem->hold_count;
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KASSERT(mem->hold_count >= 0, ("vm_page_unhold: hold count < 0!!!"));
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}
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/*
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* vm_page_protect:
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*
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* Reduce the protection of a page. This routine never raises the
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* protection and therefore can be safely called if the page is already
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* at VM_PROT_NONE (it will be a NOP effectively ).
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*/
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static __inline void
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vm_page_protect(vm_page_t mem, int prot)
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{
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if (prot == VM_PROT_NONE) {
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if (mem->flags & (PG_WRITEABLE|PG_MAPPED)) {
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pmap_page_protect(mem, VM_PROT_NONE);
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vm_page_flag_clear(mem, PG_WRITEABLE|PG_MAPPED);
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}
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} else if ((prot == VM_PROT_READ) && (mem->flags & PG_WRITEABLE)) {
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pmap_page_protect(mem, VM_PROT_READ);
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vm_page_flag_clear(mem, PG_WRITEABLE);
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}
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}
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/*
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* vm_page_zero_fill:
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*
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* Zero-fill the specified page.
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* Written as a standard pagein routine, to
|
|
* be used by the zero-fill object.
|
|
*/
|
|
static __inline boolean_t
|
|
vm_page_zero_fill(m)
|
|
vm_page_t m;
|
|
{
|
|
pmap_zero_page(VM_PAGE_TO_PHYS(m));
|
|
return (TRUE);
|
|
}
|
|
|
|
/*
|
|
* vm_page_copy:
|
|
*
|
|
* Copy one page to another
|
|
*/
|
|
static __inline void
|
|
vm_page_copy(src_m, dest_m)
|
|
vm_page_t src_m;
|
|
vm_page_t dest_m;
|
|
{
|
|
pmap_copy_page(VM_PAGE_TO_PHYS(src_m), VM_PAGE_TO_PHYS(dest_m));
|
|
dest_m->valid = VM_PAGE_BITS_ALL;
|
|
}
|
|
|
|
/*
|
|
* vm_page_free:
|
|
*
|
|
* Free a page
|
|
*
|
|
* The clearing of PG_ZERO is a temporary safety until the code can be
|
|
* reviewed to determine that PG_ZERO is being properly cleared on
|
|
* write faults or maps. PG_ZERO was previously cleared in
|
|
* vm_page_alloc().
|
|
*/
|
|
static __inline void
|
|
vm_page_free(m)
|
|
vm_page_t m;
|
|
{
|
|
vm_page_flag_clear(m, PG_ZERO);
|
|
vm_page_free_toq(m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_free_zero:
|
|
*
|
|
* Free a page to the zerod-pages queue
|
|
*/
|
|
static __inline void
|
|
vm_page_free_zero(m)
|
|
vm_page_t m;
|
|
{
|
|
vm_page_flag_set(m, PG_ZERO);
|
|
vm_page_free_toq(m);
|
|
}
|
|
|
|
/*
|
|
* vm_page_sleep_busy:
|
|
*
|
|
* Wait until page is no longer PG_BUSY or (if also_m_busy is TRUE)
|
|
* m->busy is zero. Returns TRUE if it had to sleep ( including if
|
|
* it almost had to sleep and made temporary spl*() mods), FALSE
|
|
* otherwise.
|
|
*
|
|
* This routine assumes that interrupts can only remove the busy
|
|
* status from a page, not set the busy status or change it from
|
|
* PG_BUSY to m->busy or vise versa (which would create a timing
|
|
* window).
|
|
*
|
|
* Note that being an inline, this code will be well optimized.
|
|
*/
|
|
|
|
static __inline int
|
|
vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg)
|
|
{
|
|
if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) {
|
|
int s = splvm();
|
|
if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) {
|
|
/*
|
|
* Page is busy. Wait and retry.
|
|
*/
|
|
vm_page_flag_set(m, PG_WANTED | PG_REFERENCED);
|
|
tsleep(m, PVM, msg, 0);
|
|
}
|
|
splx(s);
|
|
return(TRUE);
|
|
/* not reached */
|
|
}
|
|
return(FALSE);
|
|
}
|
|
|
|
/*
|
|
* vm_page_dirty:
|
|
*
|
|
* make page all dirty
|
|
*/
|
|
|
|
static __inline void
|
|
vm_page_dirty(vm_page_t m)
|
|
{
|
|
#if !defined(KLD_MODULE)
|
|
KASSERT(m->queue - m->pc != PQ_CACHE, ("vm_page_dirty: page in cache!"));
|
|
#endif
|
|
m->dirty = VM_PAGE_BITS_ALL;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
m->dirty = 0;
|
|
}
|
|
|
|
#if !defined(KLD_MODULE)
|
|
|
|
static __inline vm_page_t
|
|
vm_page_list_find(int basequeue, int index, boolean_t prefer_zero)
|
|
{
|
|
vm_page_t m;
|
|
|
|
#if PQ_L2_SIZE > 1
|
|
if (prefer_zero) {
|
|
m = TAILQ_LAST(&vm_page_queues[basequeue+index].pl, pglist);
|
|
} else {
|
|
m = TAILQ_FIRST(&vm_page_queues[basequeue+index].pl);
|
|
}
|
|
if (m == NULL)
|
|
m = _vm_page_list_find(basequeue, index);
|
|
#else
|
|
if (prefer_zero) {
|
|
m = TAILQ_LAST(&vm_page_queues[basequeue].pl, pglist);
|
|
} else {
|
|
m = TAILQ_FIRST(&vm_page_queues[basequeue].pl);
|
|
}
|
|
#endif
|
|
return(m);
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_VM_PAGE_ */
|