b11fa1d14d
(allocating pv entries w/ zalloci) when called in a loop due to an madvise(). It is possible to completely exhaust the free page list and cause a system panic when an expected allocation fails.
296 lines
11 KiB
C
296 lines
11 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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* @(#)vm_map.h 8.9 (Berkeley) 5/17/95
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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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* Virtual memory map module definitions.
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*/
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#ifndef _VM_MAP_
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#define _VM_MAP_
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#include <sys/lockmgr.h>
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#ifdef MAP_LOCK_DIAGNOSTIC
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#include <sys/systm.h>
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#define vm_map_printf(str, arg) printf(str,arg)
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#else
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#define vm_map_printf(str, arg)
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#endif
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/*
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* Types defined:
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*
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* vm_map_t the high-level address map data structure.
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* vm_map_entry_t an entry in an address map.
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*/
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typedef u_int vm_eflags_t;
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/*
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* Objects which live in maps may be either VM objects, or
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* another map (called a "sharing map") which denotes read-write
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* sharing with other maps.
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*/
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union vm_map_object {
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struct vm_object *vm_object; /* object object */
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struct vm_map *sub_map; /* belongs to another map */
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};
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/*
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* Address map entries consist of start and end addresses,
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* a VM object (or sharing map) and offset into that object,
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* and user-exported inheritance and protection information.
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* Also included is control information for virtual copy operations.
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*/
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struct vm_map_entry {
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struct vm_map_entry *prev; /* previous entry */
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struct vm_map_entry *next; /* next entry */
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vm_offset_t start; /* start address */
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vm_offset_t end; /* end address */
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vm_offset_t avail_ssize; /* amt can grow if this is a stack */
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union vm_map_object object; /* object I point to */
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vm_ooffset_t offset; /* offset into object */
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vm_eflags_t eflags; /* map entry flags */
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/* Only in task maps: */
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vm_prot_t protection; /* protection code */
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vm_prot_t max_protection; /* maximum protection */
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vm_inherit_t inheritance; /* inheritance */
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int wired_count; /* can be paged if = 0 */
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vm_pindex_t lastr; /* last read */
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};
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#define MAP_ENTRY_NOSYNC 0x0001
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#define MAP_ENTRY_IS_SUB_MAP 0x0002
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#define MAP_ENTRY_COW 0x0004
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#define MAP_ENTRY_NEEDS_COPY 0x0008
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#define MAP_ENTRY_NOFAULT 0x0010
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#define MAP_ENTRY_USER_WIRED 0x0020
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#define MAP_ENTRY_BEHAV_NORMAL 0x0000 /* default behavior */
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#define MAP_ENTRY_BEHAV_SEQUENTIAL 0x0040 /* expect sequential access */
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#define MAP_ENTRY_BEHAV_RANDOM 0x0080 /* expect random access */
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#define MAP_ENTRY_BEHAV_RESERVED 0x00C0 /* future use */
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#define MAP_ENTRY_BEHAV_MASK 0x00C0
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#define MAP_ENTRY_NOCOREDUMP 0x0400 /* don't include in a core */
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/*
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* Maps are doubly-linked lists of map entries, kept sorted
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* by address. A single hint is provided to start
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* searches again from the last successful search,
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* insertion, or removal.
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*
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* Note: the lock structure cannot be the first element of vm_map
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* because this can result in a running lockup between two or more
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* system processes trying to kmem_alloc_wait() due to kmem_alloc_wait()
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* and free tsleep/waking up 'map' and the underlying lockmgr also
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* sleeping and waking up on 'map'. The lockup occurs when the map fills
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* up. The 'exec' map, for example.
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*/
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struct vm_map {
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struct vm_map_entry header; /* List of entries */
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struct lock lock; /* Lock for map data */
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int nentries; /* Number of entries */
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vm_size_t size; /* virtual size */
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u_char system_map; /* Am I a system map? */
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u_char infork; /* Am I in fork processing? */
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vm_map_entry_t hint; /* hint for quick lookups */
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unsigned int timestamp; /* Version number */
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vm_map_entry_t first_free; /* First free space hint */
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struct pmap *pmap; /* Physical map */
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#define min_offset header.start
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#define max_offset header.end
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};
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/*
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* Shareable process virtual address space.
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* May eventually be merged with vm_map.
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* Several fields are temporary (text, data stuff).
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*/
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struct vmspace {
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struct vm_map vm_map; /* VM address map */
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struct pmap vm_pmap; /* private physical map */
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int vm_refcnt; /* number of references */
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caddr_t vm_shm; /* SYS5 shared memory private data XXX */
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/* we copy from vm_startcopy to the end of the structure on fork */
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#define vm_startcopy vm_rssize
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segsz_t vm_rssize; /* current resident set size in pages */
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segsz_t vm_swrss; /* resident set size before last swap */
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segsz_t vm_tsize; /* text size (pages) XXX */
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segsz_t vm_dsize; /* data size (pages) XXX */
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segsz_t vm_ssize; /* stack size (pages) */
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caddr_t vm_taddr; /* user virtual address of text XXX */
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caddr_t vm_daddr; /* user virtual address of data XXX */
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caddr_t vm_maxsaddr; /* user VA at max stack growth */
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caddr_t vm_minsaddr; /* user VA at max stack growth */
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};
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#ifdef _KERNEL
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u_char vm_map_entry_behavior(struct vm_map_entry *entry);
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void vm_map_entry_set_behavior(struct vm_map_entry *entry, u_char behavior);
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/*
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* Macros: vm_map_lock, etc.
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* Function:
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* Perform locking on the data portion of a map. Note that
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* these macros mimic procedure calls returning void. The
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* semicolon is supplied by the user of these macros, not
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* by the macros themselves. The macros can safely be used
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* as unbraced elements in a higher level statement.
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*/
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#if 0
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/* XXX This macro is not called anywhere, and (map)->ref_lock doesn't exist. */
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#define vm_map_lock_drain_interlock(map) \
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do { \
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lockmgr(&(map)->lock, LK_DRAIN|LK_INTERLOCK, \
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&(map)->ref_lock, curthread); \
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(map)->timestamp++; \
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} while(0)
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#endif
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void vm_map_lock(vm_map_t map);
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void vm_map_unlock(vm_map_t map);
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void vm_map_lock_read(vm_map_t map);
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void vm_map_unlock_read(vm_map_t map);
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int vm_map_lock_upgrade(vm_map_t map);
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void vm_map_lock_downgrade(vm_map_t map);
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void vm_map_set_recursive(vm_map_t map);
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void vm_map_clear_recursive(vm_map_t map);
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vm_offset_t vm_map_min(vm_map_t map);
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vm_offset_t vm_map_max(vm_map_t map);
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struct pmap *vm_map_pmap(vm_map_t map);
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struct pmap *vmspace_pmap(struct vmspace *vmspace);
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long vmspace_resident_count(struct vmspace *vmspace);
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#endif /* _KERNEL */
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/* XXX: number of kernel maps and entries to statically allocate */
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#define MAX_KMAP 10
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#define MAX_KMAPENT 128
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#define MAX_MAPENT 128
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/*
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* Copy-on-write flags for vm_map operations
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*/
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#define MAP_UNUSED_01 0x0001
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#define MAP_COPY_ON_WRITE 0x0002
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#define MAP_NOFAULT 0x0004
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#define MAP_PREFAULT 0x0008
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#define MAP_PREFAULT_PARTIAL 0x0010
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#define MAP_DISABLE_SYNCER 0x0020
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#define MAP_DISABLE_COREDUMP 0x0100
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#define MAP_PREFAULT_MADVISE 0x0200 /* from (user) madvise request */
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/*
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* vm_fault option flags
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*/
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#define VM_FAULT_NORMAL 0 /* Nothing special */
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#define VM_FAULT_CHANGE_WIRING 1 /* Change the wiring as appropriate */
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#define VM_FAULT_USER_WIRE 2 /* Likewise, but for user purposes */
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#define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
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#define VM_FAULT_HOLD 4 /* Hold the page */
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#define VM_FAULT_DIRTY 8 /* Dirty the page */
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#ifdef _KERNEL
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boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
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struct pmap;
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vm_map_t vm_map_create (struct pmap *, vm_offset_t, vm_offset_t);
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int vm_map_delete (vm_map_t, vm_offset_t, vm_offset_t);
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int vm_map_find (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t *, vm_size_t, boolean_t, vm_prot_t, vm_prot_t, int);
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int vm_map_findspace (vm_map_t, vm_offset_t, vm_size_t, vm_offset_t *);
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int vm_map_inherit (vm_map_t, vm_offset_t, vm_offset_t, vm_inherit_t);
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void vm_map_init (struct vm_map *, vm_offset_t, vm_offset_t);
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void vm_map_destroy (struct vm_map *);
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int vm_map_insert (vm_map_t, vm_object_t, vm_ooffset_t, vm_offset_t, vm_offset_t, vm_prot_t, vm_prot_t, int);
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int vm_map_lookup (vm_map_t *, vm_offset_t, vm_prot_t, vm_map_entry_t *, vm_object_t *,
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vm_pindex_t *, vm_prot_t *, boolean_t *);
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void vm_map_lookup_done (vm_map_t, vm_map_entry_t);
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boolean_t vm_map_lookup_entry (vm_map_t, vm_offset_t, vm_map_entry_t *);
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int vm_map_pageable (vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
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int vm_map_user_pageable (vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
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int vm_map_clean (vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
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int vm_map_protect (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
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int vm_map_remove (vm_map_t, vm_offset_t, vm_offset_t);
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void vm_map_startup (void);
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int vm_map_submap (vm_map_t, vm_offset_t, vm_offset_t, vm_map_t);
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int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
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void vm_map_simplify_entry (vm_map_t, vm_map_entry_t);
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void vm_init2 (void);
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int vm_uiomove (vm_map_t, vm_object_t, off_t, int, vm_offset_t, int *);
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void vm_freeze_copyopts (vm_object_t, vm_pindex_t, vm_pindex_t);
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int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
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int vm_map_growstack (struct proc *p, vm_offset_t addr);
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int vmspace_swap_count (struct vmspace *vmspace);
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#endif
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#endif /* _VM_MAP_ */
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