FreeBSD/Linux Kernel Cross Reference
sys/vm/swap_pager.h
1 /*
2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991 The Regents of the University of California.
4 * All rights reserved.
5 *
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.
9 *
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. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
39 * $FreeBSD: src/sys/vm/swap_pager.h,v 1.16.2.2 1999/09/05 08:24:20 peter Exp $
40 */
41
42 /*
43 * Modifications to the block allocation data structure by John S. Dyson
44 * 18 Dec 93.
45 */
46
47 #ifndef _SWAP_PAGER_
48 #define _SWAP_PAGER_ 1
49
50 /*
51 * SWB_NPAGES can be set to any value from 1 to 16 pages per allocation,
52 * however, due to the allocation spilling into non-swap pager backed memory,
53 * suggest keeping SWB_NPAGES small (1-4). If high performance is mandatory
54 * perhaps up to 8 pages might be in order????
55 * Above problem has been fixed, now we support 16 pages per block. Unused
56 * space is recovered by the swap pager now...
57 */
58 #define SWB_NPAGES 8
59 struct swblock {
60 unsigned short swb_valid; /* bitmask for valid pages */
61 unsigned short swb_locked; /* block locked */
62 daddr_t swb_block[SWB_NPAGES];
63 };
64 typedef struct swblock *sw_blk_t;
65
66 #ifdef KERNEL
67 extern struct pagerlst swap_pager_un_object_list;
68 extern int swap_pager_full;
69 extern struct rlisthdr swaplist;
70
71 int swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));
72 int swap_pager_swp_alloc __P((vm_object_t, int));
73 void swap_pager_copy __P((vm_object_t, vm_pindex_t, vm_object_t,
74 vm_pindex_t, vm_pindex_t));
75 void swap_pager_freespace __P((vm_object_t, vm_pindex_t, vm_size_t));
76 void swap_pager_dmzspace __P((vm_object_t, vm_pindex_t, vm_size_t));
77 void swap_pager_swap_init __P((void));
78 #endif
79
80 #endif /* _SWAP_PAGER_ */
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