c944491426
cache: vm_object_page_remove() should convert any cached pages that fall with the specified range to free pages. Otherwise, there could be a problem if a file is first truncated and then regrown. Specifically, some old data from prior to the truncation might reappear. Generalize vm_page_cache_free() to support the conversion of either a subset or the entirety of an object's cached pages. Reported by: tegge Reviewed by: tegge Approved by: re (kensmith)
386 lines
13 KiB
C
386 lines
13 KiB
C
/*-
|
|
* 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 */
|
|
uint8_t queue; /* page queue index */
|
|
int8_t segind;
|
|
u_short flags; /* see below */
|
|
uint8_t order; /* index of the buddy queue */
|
|
uint8_t pool;
|
|
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_BUSY 0x0001 /* page is in transit */
|
|
#define VPO_WANTED 0x0002 /* someone is waiting for page */
|
|
#define VPO_CLEANCHK 0x0100 /* page will be checked for cleaning */
|
|
#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
|
|
|
|
#define PQ_NONE 0
|
|
#define PQ_INACTIVE 1
|
|
#define PQ_ACTIVE 2
|
|
#define PQ_HOLD 3
|
|
#define PQ_COUNT 4
|
|
#define PQ_MAXCOUNT 4
|
|
|
|
/* 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_GETKNOWNQUEUE2(m) VM_PAGE_GETQUEUE(m)
|
|
|
|
/* Returns true if the page is in the named well known queue. */
|
|
#define VM_PAGE_INQUEUE2(m, q) (VM_PAGE_GETKNOWNQUEUE2(m) == (q))
|
|
|
|
/* Sets the queue a page is on. */
|
|
#define VM_PAGE_SETQUEUE2(m, q) (VM_PAGE_GETQUEUE(m) = (q))
|
|
|
|
struct vpgqueues {
|
|
struct pglist pl;
|
|
int *cnt;
|
|
};
|
|
|
|
extern struct vpgqueues vm_page_queues[PQ_MAXCOUNT];
|
|
extern struct mtx vm_page_queue_free_mtx;
|
|
|
|
/*
|
|
* 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_CACHED 0x0001 /* page is cached */
|
|
#define PG_FREE 0x0002 /* page is free */
|
|
#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_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
|
|
|
|
#include <vm/vm_param.h>
|
|
|
|
/*
|
|
* Each pageable resident page falls into one of five lists:
|
|
*
|
|
* free
|
|
* Available for allocation now.
|
|
*
|
|
* cache
|
|
* Almost available for allocation. Still associated with
|
|
* an object, but clean and immediately freeable.
|
|
*
|
|
* hold
|
|
* Will become free after a pending I/O operation
|
|
* completes.
|
|
*
|
|
* The following lists are LRU sorted:
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
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_IS_FREE(m) (((m)->flags & PG_FREE) != 0)
|
|
|
|
#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
|
|
|
|
vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
|
|
|
|
static __inline vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa);
|
|
|
|
static __inline vm_page_t
|
|
PHYS_TO_VM_PAGE(vm_paddr_t pa)
|
|
{
|
|
#ifdef VM_PHYSSEG_SPARSE
|
|
return (vm_phys_paddr_to_vm_page(pa));
|
|
#elif defined(VM_PHYSSEG_DENSE)
|
|
return (&vm_page_array[atop(pa) - first_page]);
|
|
#else
|
|
#error "Either VM_PHYSSEG_DENSE or VM_PHYSSEG_SPARSE must be defined."
|
|
#endif
|
|
}
|
|
|
|
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 */
|
|
#define VM_ALLOC_IFCACHED 0x0400 /* Fail if the page is not cached */
|
|
#define VM_ALLOC_IFNOTCACHED 0x0800 /* Fail if the page is cached */
|
|
|
|
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_enqueue(int queue, vm_page_t m);
|
|
void vm_pageq_remove(vm_page_t m);
|
|
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);
|
|
void vm_page_cache_free(vm_object_t, vm_pindex_t, vm_pindex_t);
|
|
void vm_page_cache_remove(vm_page_t);
|
|
void vm_page_cache_transfer(vm_object_t, vm_pindex_t, vm_object_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);
|
|
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_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 VPO_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->oflags & VPO_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_ */
|