install(1): Fix building on release and older systems.
[dragonfly.git] / sys / vm / swap_pager.h
blob3bb1414a443390078c86012c83efb303ffe06ae0
1 /*
2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991 The Regents of the University of California.
4 * All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
34 * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
35 * $FreeBSD: src/sys/vm/swap_pager.h,v 1.28.2.1 2000/10/13 07:13:23 dillon Exp $
39 * Modifications to the block allocation data structure by John S. Dyson
40 * 18 Dec 93.
43 #ifndef _VM_SWAP_PAGER_H_
44 #define _VM_SWAP_PAGER_H_
46 #ifndef _SYS_TYPES_H_
47 #include <sys/types.h>
48 #endif
49 #ifndef _VM_VM_OBJECT_H_
50 #include <vm/vm_object.h>
51 #endif
52 #ifndef _SYS_BLIST_H_
53 #include <sys/blist.h>
54 #endif
57 * SWB_NPAGES must be a power of 2. Note that DMMAX may not exceed
58 * SWBLK_BITS, so the limit for SWB_NPAGES is (SWBLK_BITS / 2).
60 #define SWB_NPAGES 16
63 * DMMAX is the stripe size and must be a power of 2 >= SWBLK_BITS to ensure
64 * that the blist code does not allocate a contiguous range that crosses a
65 * stripe.
67 #define SWB_DMMAX SWBLK_BITS
68 #define SWB_DMMASK (SWB_DMMAX - 1)
71 * Piecemeal swap metadata structure. Swap is stored in a RBTREE. Swap
72 * blocks are page-sized. e.g. block 1 is offset +4096 from block 0.
74 * ram:swap is around 1:341
76 * Overall memory utilization is about the same as the old swap structure.
79 #define SWAP_META_PAGES (SWB_NPAGES * 2)
80 #define SWAP_META_MASK (SWAP_META_PAGES - 1)
82 struct swblock {
83 RB_ENTRY(swblock) swb_entry;
84 vm_pindex_t swb_index;
85 int swb_count;
86 swblk_t swb_pages[SWAP_META_PAGES];
89 #ifdef _KERNEL
90 extern int swap_pager_full;
91 extern int swap_pager_almost_full;
92 extern int swap_fail_ticks;
93 extern int swap_user_async;
94 extern swblk_t vm_swap_size;
95 extern swblk_t vm_swap_max;
96 extern swblk_t vm_swap_cache_use;
97 extern swblk_t vm_swap_anon_use;
98 extern int vm_swapcache_read_enable;
99 extern int vm_swapcache_inactive_heuristic;
100 extern int vm_swapcache_use_chflags;
102 extern struct blist *swapblist;
103 extern int nswap_lowat, nswap_hiwat;
105 void swap_pager_putpages (vm_object_t, struct vm_page **, int, int, int *);
106 boolean_t swap_pager_haspage (vm_object_t object, vm_pindex_t pindex);
107 int swap_pager_swapoff (int devidx);
109 int swap_pager_swp_alloc (vm_object_t, int);
110 void swap_pager_copy (vm_object_t, vm_object_t, vm_pindex_t, int);
111 void swap_pager_freespace (vm_object_t, vm_pindex_t, vm_pindex_t);
112 void swap_pager_freespace_all (vm_object_t);
113 int swap_pager_condfree(vm_object_t, vm_pindex_t *, int);
115 void swap_pager_page_inserted(vm_page_t);
116 void swap_pager_swap_init (void);
117 void swap_pager_newswap (void);
118 int swap_pager_reserve (vm_object_t, vm_pindex_t, vm_size_t);
120 void swapacctspace(swblk_t base, swblk_t count);
123 * newswap functions
126 void swap_pager_page_removed (struct vm_page *, vm_object_t);
128 /* choose underlying swap device and queue up I/O */
129 struct buf;
130 void swstrategy (struct buf *bp); /* probably needs to move elsewhere */
132 #endif
134 #endif /* _VM_SWAP_PAGER_H_ */