1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/*****************************************************************************
Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/**************************************************//**
@file include/buf0types.h
The database buffer pool global types for the directory
Created 11/17/1995 Heikki Tuuri
*******************************************************/
#ifndef buf0types_h
#define buf0types_h
#include "page0types.h"
/** Buffer page (uncompressed or compressed) */
typedef struct buf_page_struct buf_page_t;
/** Buffer block for which an uncompressed page exists */
typedef struct buf_block_struct buf_block_t;
/** Buffer pool chunk comprising buf_block_t */
typedef struct buf_chunk_struct buf_chunk_t;
/** Buffer pool comprising buf_chunk_t */
typedef struct buf_pool_struct buf_pool_t;
/** Buffer pool statistics struct */
typedef struct buf_pool_stat_struct buf_pool_stat_t;
/** Buffer pool buddy statistics struct */
typedef struct buf_buddy_stat_struct buf_buddy_stat_t;
/** A buffer frame. @see page_t */
typedef byte buf_frame_t;
/** Flags for flush types */
enum buf_flush {
BUF_FLUSH_LRU = 0, /*!< flush via the LRU list */
BUF_FLUSH_SINGLE_PAGE, /*!< flush a single page */
BUF_FLUSH_LIST, /*!< flush via the flush list
of dirty blocks */
BUF_FLUSH_N_TYPES /*!< index of last element + 1 */
};
/** Flags for io_fix types */
enum buf_io_fix {
BUF_IO_NONE = 0, /**< no pending I/O */
BUF_IO_READ, /**< read pending */
BUF_IO_WRITE, /**< write pending */
BUF_IO_PIN /**< disallow relocation of
block and its removal of from
the flush_list */
};
/** Algorithm to remove the pages for a tablespace from the buffer pool.
@See buf_LRU_flush_or_remove_pages(). */
enum buf_remove_t {
BUF_REMOVE_ALL_NO_WRITE, /*!< Remove all pages from the buffer
pool, don't write or sync to disk */
BUF_REMOVE_FLUSH_NO_WRITE /*!< Remove only, from the flush list,
don't write or sync to disk */
};
/** Parameters of binary buddy system for compressed pages (buf0buddy.h) */
/* @{ */
#define BUF_BUDDY_LOW_SHIFT PAGE_ZIP_MIN_SIZE_SHIFT
#define BUF_BUDDY_LOW (1 << BUF_BUDDY_LOW_SHIFT)
#define BUF_BUDDY_SIZES (UNIV_PAGE_SIZE_SHIFT - BUF_BUDDY_LOW_SHIFT)
/*!< number of buddy sizes */
/** twice the maximum block size of the buddy system;
the underlying memory is aligned by this amount:
this must be equal to UNIV_PAGE_SIZE */
#define BUF_BUDDY_HIGH (BUF_BUDDY_LOW << BUF_BUDDY_SIZES)
/* @} */
#endif
|
