/* * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * The Mach Operating System project at Carnegie-Mellon University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93 * * * Copyright (c) 1987, 1990 Carnegie-Mellon University. * All rights reserved. * * Authors: Avadis Tevanian, Jr., Michael Wayne Young * * Permission to use, copy, modify and distribute this software and * its documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. * * $FreeBSD$ */ /* * Resident memory system definitions. */ #ifndef _VM_PAGE_ #define _VM_PAGE_ #if !defined(KLD_MODULE) #include "opt_vmpage.h" #endif #include /* * Management of resident (logical) pages. * * A small structure is kept for each resident * page, indexed by page number. Each structure * is an element of several lists: * * A hash table bucket used to quickly * perform object/offset lookups * * A list of all pages for a given object, * so they can be quickly deactivated at * time of deallocation. * * An ordered list of pages due for pageout. * * In addition, the structure contains the object * and offset to which this page belongs (for pageout), * and sundry status bits. * * Fields in this structure are locked either by the lock on the * object that the page belongs to (O) or by the lock on the page * queues (P). * * The 'valid' and 'dirty' fields are distinct. A page may have dirty * bits set without having associated valid bits set. This is used by * NFS to implement piecemeal writes. */ TAILQ_HEAD(pglist, vm_page); struct vm_page { TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO queue or free list (P) */ TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */ struct vm_page *left; /* splay tree link (O) */ struct vm_page *right; /* splay tree link (O) */ vm_object_t object; /* which object am I in (O,P)*/ vm_pindex_t pindex; /* offset into object (O,P) */ vm_paddr_t phys_addr; /* physical address of page */ struct md_page md; /* machine dependant stuff */ u_short queue; /* page queue index */ u_short flags, /* see below */ pc; /* page color */ u_short wire_count; /* wired down maps refs (P) */ short hold_count; /* page hold count */ u_char act_count; /* page usage count */ u_char busy; /* page busy count */ /* NOTE that these must support one bit per DEV_BSIZE in a page!!! */ /* so, on normal X86 kernels, they must be at least 8 bits wide */ #if PAGE_SIZE == 4096 u_char valid; /* map of valid DEV_BSIZE chunks (O) */ u_char dirty; /* map of dirty DEV_BSIZE chunks */ #elif PAGE_SIZE == 8192 u_short valid; /* map of valid DEV_BSIZE chunks (O) */ u_short dirty; /* map of dirty DEV_BSIZE chunks */ #elif PAGE_SIZE == 16384 u_int valid; /* map of valid DEV_BSIZE chunks (O) */ u_int dirty; /* map of dirty DEV_BSIZE chunks */ #elif PAGE_SIZE == 32768 u_long valid; /* map of valid DEV_BSIZE chunks (O) */ u_long dirty; /* map of dirty DEV_BSIZE chunks */ #endif u_int cow; /* page cow mapping count */ }; /* Make sure that u_long is at least 64 bits when PAGE_SIZE is 32K. */ #if PAGE_SIZE == 32768 #ifdef CTASSERT CTASSERT(sizeof(u_long) >= 8); #endif #endif /* * note: currently use SWAPBLK_NONE as an absolute value rather then * a flag bit. */ #define SWAPBLK_MASK ((daddr_t)((u_daddr_t)-1 >> 1)) /* mask */ #define SWAPBLK_NONE ((daddr_t)((u_daddr_t)SWAPBLK_MASK + 1))/* flag */ #if !defined(KLD_MODULE) /* * Page coloring parameters */ /* Each of PQ_FREE, and PQ_CACHE have PQ_HASH_SIZE entries */ /* Backward compatibility for existing PQ_*CACHE config options. */ #if !defined(PQ_CACHESIZE) #if defined(PQ_HUGECACHE) #define PQ_CACHESIZE 1024 #elif defined(PQ_LARGECACHE) #define PQ_CACHESIZE 512 #elif defined(PQ_MEDIUMCACHE) #define PQ_CACHESIZE 256 #elif defined(PQ_NORMALCACHE) #define PQ_CACHESIZE 64 #elif defined(PQ_NOOPT) #define PQ_CACHESIZE 0 #else #define PQ_CACHESIZE 128 #endif #endif /* !defined(PQ_CACHESIZE) */ #if PQ_CACHESIZE >= 1024 #define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_L2_SIZE 256 /* A number of colors opt for 1M cache */ #elif PQ_CACHESIZE >= 512 #define PQ_PRIME1 31 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_PRIME2 23 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_L2_SIZE 128 /* A number of colors opt for 512K cache */ #elif PQ_CACHESIZE >= 256 #define PQ_PRIME1 13 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_PRIME2 7 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_L2_SIZE 64 /* A number of colors opt for 256K cache */ #elif PQ_CACHESIZE >= 128 #define PQ_PRIME1 9 /* Produces a good PQ_L2_SIZE/3 + PQ_PRIME1 */ #define PQ_PRIME2 5 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_L2_SIZE 32 /* A number of colors opt for 128k cache */ #elif PQ_CACHESIZE >= 64 #define PQ_PRIME1 5 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_PRIME2 3 /* Prime number somewhat less than PQ_HASH_SIZE */ #define PQ_L2_SIZE 16 /* A reasonable number of colors (opt for 64K cache) */ #else #define PQ_PRIME1 1 /* Disable page coloring. */ #define PQ_PRIME2 1 #define PQ_L2_SIZE 1 #endif #define PQ_L2_MASK (PQ_L2_SIZE - 1) #define PQ_NONE 0 #define PQ_FREE 1 #define PQ_INACTIVE (1 + 1*PQ_L2_SIZE) #define PQ_ACTIVE (2 + 1*PQ_L2_SIZE) #define PQ_CACHE (3 + 1*PQ_L2_SIZE) #define PQ_HOLD (3 + 2*PQ_L2_SIZE) #define PQ_COUNT (4 + 2*PQ_L2_SIZE) struct vpgqueues { struct pglist pl; int *cnt; int lcnt; }; extern struct vpgqueues vm_page_queues[PQ_COUNT]; extern struct mtx vm_page_queue_free_mtx; #endif /* !defined(KLD_MODULE) */ /* * These are the flags defined for vm_page. * * Note: PG_FILLED and PG_DIRTY are added for the filesystems. * * Note: PG_UNMANAGED (used by OBJT_PHYS) indicates that the page is * not under PV management but otherwise should be treated as a * normal page. Pages not under PV management cannot be paged out * via the object/vm_page_t because there is no knowledge of their * pte mappings, nor can they be removed from their objects via * the object, and such pages are also not on any PQ queue. */ #define PG_BUSY 0x0001 /* page is in transit (O) */ #define PG_WANTED 0x0002 /* someone is waiting for page (O) */ #define PG_WINATCFLS 0x0004 /* flush dirty page on inactive q */ #define PG_FICTITIOUS 0x0008 /* physical page doesn't exist (O) */ #define PG_WRITEABLE 0x0010 /* page is mapped writeable */ #define PG_ZERO 0x0040 /* page is zeroed */ #define PG_REFERENCED 0x0080 /* page has been referenced */ #define PG_CLEANCHK 0x0100 /* page will be checked for cleaning */ #define PG_SWAPINPROG 0x0200 /* swap I/O in progress on page */ #define PG_NOSYNC 0x0400 /* do not collect for syncer */ #define PG_UNMANAGED 0x0800 /* No PV management for page */ #define PG_MARKER 0x1000 /* special queue marker page */ #define PG_SLAB 0x2000 /* object pointer is actually a slab */ /* * Misc constants. */ #define ACT_DECLINE 1 #define ACT_ADVANCE 3 #define ACT_INIT 5 #define ACT_MAX 64 #define PFCLUSTER_BEHIND 3 #define PFCLUSTER_AHEAD 3 #ifdef _KERNEL /* * Each pageable resident page falls into one of four lists: * * free * Available for allocation now. * * The following are all LRU sorted: * * cache * Almost available for allocation. Still in an * object, but clean and immediately freeable at * non-interrupt times. * * inactive * Low activity, candidates for reclamation. * This is the list of pages that should be * paged out next. * * active * Pages that are "active" i.e. they have been * recently referenced. * * zero * Pages that are really free and have been pre-zeroed * */ extern int vm_page_zero_count; extern vm_page_t vm_page_array; /* First resident page in table */ extern int 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) #define PHYS_TO_VM_PAGE(pa) \ (&vm_page_array[atop(pa) - first_page ]) extern struct mtx vm_page_queue_mtx; #define vm_page_lock_queues() mtx_lock(&vm_page_queue_mtx) #define vm_page_unlock_queues() mtx_unlock(&vm_page_queue_mtx) #if PAGE_SIZE == 4096 #define VM_PAGE_BITS_ALL 0xffu #elif PAGE_SIZE == 8192 #define VM_PAGE_BITS_ALL 0xffffu #elif PAGE_SIZE == 16384 #define VM_PAGE_BITS_ALL 0xffffffffu #elif PAGE_SIZE == 32768 #define VM_PAGE_BITS_ALL 0xfffffffffffffffflu #endif /* page allocation classes: */ #define VM_ALLOC_NORMAL 0 #define VM_ALLOC_INTERRUPT 1 #define VM_ALLOC_SYSTEM 2 #define VM_ALLOC_CLASS_MASK 3 /* page allocation flags: */ #define VM_ALLOC_WIRED 0x0020 /* non pageable */ #define VM_ALLOC_ZERO 0x0040 /* Try to obtain a zeroed page */ #define VM_ALLOC_RETRY 0x0080 /* vm_page_grab() only */ #define VM_ALLOC_NOOBJ 0x0100 /* No associated object */ void vm_page_flag_set(vm_page_t m, unsigned short bits); void vm_page_flag_clear(vm_page_t m, unsigned short bits); void vm_page_busy(vm_page_t m); void vm_page_flash(vm_page_t m); void vm_page_io_start(vm_page_t m); void vm_page_io_finish(vm_page_t m); void vm_page_hold(vm_page_t mem); void vm_page_unhold(vm_page_t mem); void vm_page_free(vm_page_t m); void vm_page_free_zero(vm_page_t m); int vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg); void vm_page_dirty(vm_page_t m); void vm_page_wakeup(vm_page_t m); void vm_pageq_init(void); vm_page_t vm_pageq_add_new_page(vm_paddr_t pa); void vm_pageq_enqueue(int queue, vm_page_t m); void vm_pageq_remove_nowakeup(vm_page_t m); void vm_pageq_remove(vm_page_t m); vm_page_t vm_pageq_find(int basequeue, int index, boolean_t prefer_zero); void vm_pageq_requeue(vm_page_t m); void vm_page_activate (vm_page_t); vm_page_t vm_page_alloc (vm_object_t, vm_pindex_t, int); vm_page_t vm_page_grab (vm_object_t, vm_pindex_t, int); void vm_page_cache (register vm_page_t); int vm_page_try_to_cache (vm_page_t); int vm_page_try_to_free (vm_page_t); void vm_page_dontneed (register vm_page_t); void vm_page_deactivate (vm_page_t); void vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t); vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t); void vm_page_remove (vm_page_t); void vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t); vm_page_t vm_page_select_cache(int); vm_page_t vm_page_splay(vm_pindex_t, vm_page_t); vm_offset_t vm_page_startup (vm_offset_t, vm_offset_t, vm_offset_t); void vm_page_unmanage (vm_page_t); void vm_page_unwire (vm_page_t, int); void vm_page_wire (vm_page_t); 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); int vm_page_is_valid (vm_page_t, int, int); void vm_page_test_dirty (vm_page_t); int vm_page_bits (int, int); void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid); void vm_page_free_toq(vm_page_t m); void vm_page_zero_idle_wakeup(void); void vm_page_cowfault (vm_page_t); void vm_page_cowsetup (vm_page_t); void vm_page_cowclear (vm_page_t); /* * 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; } #endif /* _KERNEL */ #endif /* !_VM_PAGE_ */