/* * 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. * * $Id: vm_page.h,v 1.62 1999/06/22 07:18:20 alc Exp $ */ /* * Resident memory system definitions. */ #ifndef _VM_PAGE_ #define _VM_PAGE_ #if !defined(KLD_MODULE) #include "opt_vmpage.h" #endif #include #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) */ struct vm_page *hnext; /* hash table link (O,P) */ TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */ vm_object_t object; /* which object am I in (O,P)*/ vm_pindex_t pindex; /* offset into object (O,P) */ vm_offset_t phys_addr; /* physical address of page */ 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 */ u_char dirty; /* map of dirty DEV_BSIZE chunks */ #elif PAGE_SIZE == 8192 u_short valid; /* map of valid DEV_BSIZE chunks */ u_short dirty; /* map of dirty DEV_BSIZE chunks */ #endif }; /* * note SWAPBLK_NONE is a flag, basically the high 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 */ /* Define one of the following */ #if defined(PQ_HUGECACHE) #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 */ #endif /* Define one of the following */ #if defined(PQ_LARGECACHE) #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 */ #endif /* * Use 'options PQ_NOOPT' to disable page coloring */ #if defined(PQ_NOOPT) #define PQ_PRIME1 1 #define PQ_PRIME2 1 #define PQ_L2_SIZE 1 #endif #if defined(PQ_NORMALCACHE) #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) */ #endif #if defined(PQ_MEDIUMCACHE) || !defined(PQ_L2_SIZE) #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 */ #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_COUNT (3 + 2*PQ_L2_SIZE) extern struct vpgqueues { struct pglist *pl; int *cnt; int *lcnt; } vm_page_queues[PQ_COUNT]; #endif /* * These are the flags defined for vm_page. * * Note: PG_FILLED and PG_DIRTY are added for the filesystems. */ #define PG_BUSY 0x0001 /* page is in transit (O) */ #define PG_WANTED 0x0002 /* someone is waiting for page (O) */ #define PG_FICTITIOUS 0x0008 /* physical page doesn't exist (O) */ #define PG_WRITEABLE 0x0010 /* page is mapped writeable */ #define PG_MAPPED 0x0020 /* page is mapped */ #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 */ /* * 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 * */ #if !defined(KLD_MODULE) extern struct pglist vm_page_queue_free[PQ_L2_SIZE];/* memory free queue */ extern struct pglist vm_page_queue_active; /* active memory queue */ extern struct pglist vm_page_queue_inactive; /* inactive memory queue */ extern struct pglist vm_page_queue_cache[PQ_L2_SIZE];/* cache memory queue */ #endif extern int vm_page_zero_count; extern vm_page_t vm_page_array; /* First resident page in table */ 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 ]) /* * Functions implemented as macros */ static __inline void vm_page_flag_set(vm_page_t m, unsigned int bits) { atomic_set_short(&(m)->flags, bits); } static __inline void vm_page_flag_clear(vm_page_t m, unsigned int bits) { atomic_clear_short(&(m)->flags, bits); } #if 0 static __inline void vm_page_assert_wait(vm_page_t m, int interruptible) { vm_page_flag_set(m, PG_WANTED); assert_wait((int) m, interruptible); } #endif static __inline void vm_page_busy(vm_page_t m) { KASSERT((m->flags & PG_BUSY) == 0, ("vm_page_busy: page already busy!!!")); vm_page_flag_set(m, PG_BUSY); } /* * vm_page_flash: * * wakeup anyone waiting for the page. */ static __inline void vm_page_flash(vm_page_t m) { if (m->flags & PG_WANTED) { vm_page_flag_clear(m, PG_WANTED); wakeup(m); } } /* * vm_page_wakeup: * * clear the PG_BUSY flag and wakeup anyone waiting for the * page. * */ static __inline void vm_page_wakeup(vm_page_t m) { KASSERT(m->flags & PG_BUSY, ("vm_page_wakeup: page not busy!!!")); vm_page_flag_clear(m, PG_BUSY); vm_page_flash(m); } /* * * */ static __inline void vm_page_io_start(vm_page_t m) { atomic_add_char(&(m)->busy, 1); } static __inline void vm_page_io_finish(vm_page_t m) { atomic_subtract_char(&m->busy, 1); if (m->busy == 0) vm_page_flash(m); } #if PAGE_SIZE == 4096 #define VM_PAGE_BITS_ALL 0xff #endif #if PAGE_SIZE == 8192 #define VM_PAGE_BITS_ALL 0xffff #endif #define VM_ALLOC_NORMAL 0 #define VM_ALLOC_INTERRUPT 1 #define VM_ALLOC_SYSTEM 2 #define VM_ALLOC_ZERO 3 #define VM_ALLOC_RETRY 0x80 void vm_page_activate __P((vm_page_t)); vm_page_t vm_page_alloc __P((vm_object_t, vm_pindex_t, int)); vm_page_t vm_page_grab __P((vm_object_t, vm_pindex_t, int)); void vm_page_cache __P((register vm_page_t)); static __inline void vm_page_copy __P((vm_page_t, vm_page_t)); static __inline void vm_page_free __P((vm_page_t)); static __inline void vm_page_free_zero __P((vm_page_t)); void vm_page_deactivate __P((vm_page_t)); void vm_page_insert __P((vm_page_t, vm_object_t, vm_pindex_t)); vm_page_t vm_page_lookup __P((vm_object_t, vm_pindex_t)); void vm_page_remove __P((vm_page_t)); void vm_page_rename __P((vm_page_t, vm_object_t, vm_pindex_t)); vm_offset_t vm_page_startup __P((vm_offset_t, vm_offset_t, vm_offset_t)); void vm_page_unwire __P((vm_page_t, int)); void vm_page_wire __P((vm_page_t)); void vm_page_unqueue __P((vm_page_t)); void vm_page_unqueue_nowakeup __P((vm_page_t)); void vm_page_set_validclean __P((vm_page_t, int, int)); void vm_page_set_dirty __P((vm_page_t, int, int)); void vm_page_clear_dirty __P((vm_page_t, int, int)); void vm_page_set_invalid __P((vm_page_t, int, int)); static __inline boolean_t vm_page_zero_fill __P((vm_page_t)); int vm_page_is_valid __P((vm_page_t, int, int)); void vm_page_test_dirty __P((vm_page_t)); int vm_page_bits __P((int, int)); vm_page_t _vm_page_list_find __P((int, int)); #if 0 int vm_page_sleep(vm_page_t m, char *msg, char *busy); int vm_page_asleep(vm_page_t m, char *msg, char *busy); #endif void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid); void vm_page_free_toq(vm_page_t m); /* * Keep page from being freed by the page daemon * much of the same effect as wiring, except much lower * overhead and should be used only for *very* temporary * holding ("wiring"). */ static __inline void vm_page_hold(vm_page_t mem) { mem->hold_count++; } static __inline void vm_page_unhold(vm_page_t mem) { --mem->hold_count; KASSERT(mem->hold_count >= 0, ("vm_page_unhold: hold count < 0!!!")); } /* * vm_page_protect: * * Reduce the protection of a page. This routine never * raises the protection and therefore can be safely * called if the page is already at VM_PROT_NONE ( it * will be a NOP effectively ). */ static __inline void vm_page_protect(vm_page_t mem, int prot) { if (prot == VM_PROT_NONE) { if (mem->flags & (PG_WRITEABLE|PG_MAPPED)) { pmap_page_protect(VM_PAGE_TO_PHYS(mem), VM_PROT_NONE); vm_page_flag_clear(mem, PG_WRITEABLE|PG_MAPPED); } } else if ((prot == VM_PROT_READ) && (mem->flags & PG_WRITEABLE)) { pmap_page_protect(VM_PAGE_TO_PHYS(mem), VM_PROT_READ); vm_page_flag_clear(mem, PG_WRITEABLE); } } /* * vm_page_zero_fill: * * Zero-fill the specified page. * 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); } #if !defined(KLD_MODULE) /* * vm_page_dirty: * * make page all dirty */ static __inline void vm_page_dirty(vm_page_t m) { KASSERT(m->queue - m->pc != PQ_CACHE, ("vm_page_dirty: page in cache!")); m->dirty = VM_PAGE_BITS_ALL; } 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_ */