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freebsd-dev/sys/vm/vm_page.h
Alan Cox eb4bbba83a Refactor vm_page_sleep_if_busy() so that the test for a busy page is 
inlined and a procedure call is made in the rare case, i.e., when it is
necessary to sleep.  In this case, inlining the test actually makes the
kernel smaller.
2006-08-27 19:50:13 +00:00

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/*-
* 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.
* 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_
#include <vm/pmap.h>
/*
* 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) */
u_int cow; /* page cow mapping count */
short hold_count; /* page hold count */
u_short oflags; /* page flags (O) */
u_char act_count; /* page usage count */
u_char busy; /* page busy count (O) */
/* 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
};
/*
* Page flags stored in oflags:
*
* Access to these page flags is synchronized by the lock on the object
* containing the page (O).
*/
#define VPO_WANTED 0x0002 /* someone is waiting for page */
#define VPO_SWAPINPROG 0x0200 /* swap I/O in progress on page */
#define VPO_NOSYNC 0x0400 /* do not collect for syncer */
/* 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
/* PQ_CACHE and PQ_FREE represents a PQ_NUMCOLORS consecutive queue. */
#define PQ_NONE 0
#define PQ_FREE 1
#define PQ_INACTIVE (page_queue_coloring.inactive)
#define PQ_ACTIVE (page_queue_coloring.active)
#define PQ_CACHE (page_queue_coloring.cache)
#define PQ_HOLD (page_queue_coloring.hold)
#define PQ_COUNT (page_queue_coloring.count)
#define PQ_MAXCOLORS 1024
#define PQ_MAXCOUNT (4 + 2 * PQ_MAXCOLORS)
#define PQ_NUMCOLORS (page_queue_coloring.numcolors)
#define PQ_PRIME1 (page_queue_coloring.prime1)
#define PQ_PRIME2 (page_queue_coloring.prime2)
#define PQ_COLORMASK (page_queue_coloring.colormask)
#define PQ_MAXLENGTH (page_queue_coloring.maxlength)
/* Returns the real queue a page is on. */
#define VM_PAGE_GETQUEUE(m) ((m)->queue)
/* Returns the well known queue a page is on. */
#define VM_PAGE_GETKNOWNQUEUE1(m) ((m)->queue - (m)->pc)
#define VM_PAGE_GETKNOWNQUEUE2(m) VM_PAGE_GETQUEUE(m)
/* Given the real queue number and a page color return the well know queue. */
#define VM_PAGE_RESOLVEQUEUE(m, q) ((q) - (m)->pc)
/* Returns true if the page is in the named well known queue. */
#define VM_PAGE_INQUEUE1(m, q) (VM_PAGE_GETKNOWNQUEUE1(m) == (q))
#define VM_PAGE_INQUEUE2(m, q) (VM_PAGE_GETKNOWNQUEUE2(m) == (q))
/* Sets the queue a page is on. */
#define VM_PAGE_SETQUEUE1(m, q) (VM_PAGE_GETQUEUE(m) = (q) + (m)->pc)
#define VM_PAGE_SETQUEUE2(m, q) (VM_PAGE_GETQUEUE(m) = (q))
struct vpgqueues {
struct pglist pl;
int *cnt;
int lcnt;
};
struct pq_coloring {
int numcolors;
int colormask;
int prime1;
int prime2;
int inactive;
int active;
int cache;
int hold;
int count;
int maxlength;
};
extern struct vpgqueues vm_page_queues[PQ_MAXCOUNT];
extern struct mtx vm_page_queue_free_mtx;
extern struct pq_coloring page_queue_coloring;
/*
* These are the flags defined for vm_page.
*
* 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_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_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
#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 */
#define VM_ALLOC_NOBUSY 0x0200 /* Do not busy the page */
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);
void vm_page_dirty(vm_page_t m);
void vm_page_wakeup(vm_page_t m);
void vm_pageq_init(void);
void 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_alloc_contig (vm_pindex_t, vm_paddr_t, vm_paddr_t,
vm_offset_t, vm_offset_t);
void vm_page_release_contig (vm_page_t, vm_pindex_t);
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);
void vm_page_sleep(vm_page_t m, const char *msg);
vm_page_t vm_page_splay(vm_pindex_t, vm_page_t);
vm_offset_t vm_page_startup(vm_offset_t vaddr);
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_sleep_if_busy:
*
* Sleep and release the page queues lock if PG_BUSY is set or,
* if also_m_busy is TRUE, busy is non-zero. Returns TRUE if the
* thread slept and the page queues lock was released.
* Otherwise, retains the page queues lock and returns FALSE.
*
* The object containing the given page must be locked.
*/
static __inline int
vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg)
{
if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) {
vm_page_sleep(m, msg);
return (TRUE);
}
return (FALSE);
}
/*
* 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_ */
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