Update the pciconf(8) database.
[dragonfly.git] / include / mpool.h
blob16ea23bc8f073baa56149d66cee4417b2b43709e
1 /*-
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
29 * @(#)mpool.h 8.4 (Berkeley) 11/2/95
30 * $FreeBSD: head/include/mpool.h 203964 2010-02-16 19:39:50Z imp $
33 #ifndef _MPOOL_H_
34 #define _MPOOL_H_
36 #include <sys/queue.h>
39 * The memory pool scheme is a simple one. Each in-memory page is referenced
40 * by a bucket which is threaded in up to two of three ways. All active pages
41 * are threaded on a hash chain (hashed by page number) and an lru chain.
42 * Inactive pages are threaded on a free chain. Each reference to a memory
43 * pool is handed an opaque MPOOL cookie which stores all of this information.
45 #define HASHSIZE 128
46 #define HASHKEY(pgno) ((pgno - 1 + HASHSIZE) % HASHSIZE)
48 /* The BKT structures are the elements of the queues. */
49 typedef struct _bkt {
50 TAILQ_ENTRY(_bkt) hq; /* hash queue */
51 TAILQ_ENTRY(_bkt) q; /* lru queue */
52 void *page; /* page */
53 pgno_t pgno; /* page number */
55 #define MPOOL_DIRTY 0x01 /* page needs to be written */
56 #define MPOOL_PINNED 0x02 /* page is pinned into memory */
57 #define MPOOL_INUSE 0x04 /* page address is valid */
58 u_int8_t flags; /* flags */
59 } BKT;
61 typedef struct MPOOL {
62 TAILQ_HEAD(_lqh, _bkt) lqh; /* lru queue head */
63 /* hash queue array */
64 TAILQ_HEAD(_hqh, _bkt) hqh[HASHSIZE];
65 pgno_t curcache; /* current number of cached pages */
66 pgno_t maxcache; /* max number of cached pages */
67 pgno_t npages; /* number of pages in the file */
68 unsigned long pagesize; /* file page size */
69 int fd; /* file descriptor */
70 /* page in conversion routine */
71 void (*pgin)(void *, pgno_t, void *);
72 /* page out conversion routine */
73 void (*pgout)(void *, pgno_t, void *);
74 void *pgcookie; /* cookie for page in/out routines */
75 #ifdef STATISTICS
76 unsigned long cachehit;
77 unsigned long cachemiss;
78 unsigned long pagealloc;
79 unsigned long pageflush;
80 unsigned long pageget;
81 unsigned long pagenew;
82 unsigned long pageput;
83 unsigned long pageread;
84 unsigned long pagewrite;
85 #endif
86 } MPOOL;
88 #define MPOOL_IGNOREPIN 0x01 /* Ignore if the page is pinned. */
89 #define MPOOL_PAGE_REQUEST 0x01 /* Allocate a new page with a
90 specific page number. */
91 #define MPOOL_PAGE_NEXT 0x02 /* Allocate a new page with the next
92 page number. */
94 __BEGIN_DECLS
95 MPOOL *mpool_open(void *, int, pgno_t, pgno_t);
96 void mpool_filter(MPOOL *, void (*)(void *, pgno_t, void *),
97 void (*)(void *, pgno_t, void *), void *);
98 void *mpool_new(MPOOL *, pgno_t *, unsigned int);
99 void *mpool_get(MPOOL *, pgno_t, unsigned int);
100 int mpool_delete(MPOOL *, void *);
101 int mpool_put(MPOOL *, void *, unsigned int);
102 int mpool_sync(MPOOL *);
103 int mpool_close(MPOOL *);
104 #ifdef STATISTICS
105 void mpool_stat(MPOOL *);
106 #endif
107 __END_DECLS
109 #endif