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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*****************************************************************************
Copyright (c) 2006, 2016, 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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/buf0buddy.ic
Binary buddy allocator for compressed pages
Created December 2006 by Marko Makela
*******************************************************/
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE
#endif
#include "buf0buf.h"
#include "buf0buddy.h"
/**********************************************************************//**
Allocate a block. The thread calling this function must hold
buf_pool->mutex and must not hold buf_pool->zip_mutex or any block->mutex.
The buf_pool_mutex may be released and reacquired.
@return allocated block, never NULL */
void*
buf_buddy_alloc_low(
/*================*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool instance */
ulint i, /*!< in: index of buf_pool->zip_free[],
or BUF_BUDDY_SIZES */
bool* lru) /*!< in: pointer to a variable that
will be assigned true if storage was
allocated from the LRU list and
buf_pool->mutex was temporarily
released */
MY_ATTRIBUTE((malloc, nonnull));
/**********************************************************************//**
Deallocate a block. */
void
buf_buddy_free_low(
/*===============*/
buf_pool_t* buf_pool, /*!< in: buffer pool instance */
void* buf, /*!< in: block to be freed, must not be
pointed to by the buffer pool */
ulint i) /*!< in: index of buf_pool->zip_free[],
or BUF_BUDDY_SIZES */
MY_ATTRIBUTE((nonnull));
/**********************************************************************//**
Get the index of buf_pool->zip_free[] for a given block size.
@return index of buf_pool->zip_free[], or BUF_BUDDY_SIZES */
UNIV_INLINE
ulint
buf_buddy_get_slot(
/*===============*/
ulint size) /*!< in: block size */
{
ulint i;
ulint s;
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1) {
}
ut_ad(i <= BUF_BUDDY_SIZES);
return(i);
}
/**********************************************************************//**
Allocate a block. The thread calling this function must hold
buf_pool->mutex and must not hold buf_pool->zip_mutex or any
block->mutex. The buf_pool->mutex may be released and reacquired.
This function should only be used for allocating compressed page frames.
@return allocated block, never NULL */
UNIV_INLINE
byte*
buf_buddy_alloc(
/*============*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
the page resides */
ulint size, /*!< in: compressed page size
(between UNIV_ZIP_SIZE_MIN and
srv_page_size) */
bool* lru) /*!< in: pointer to a variable
that will be assigned true if
storage was allocated from the
LRU list and buf_pool->mutex was
temporarily released */
{
ut_ad(buf_pool_mutex_own(buf_pool));
ut_ad(ut_is_2pow(size));
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
ut_ad(size <= srv_page_size);
return((byte*) buf_buddy_alloc_low(buf_pool, buf_buddy_get_slot(size),
lru));
}
/**********************************************************************//**
Deallocate a block. */
UNIV_INLINE
void
buf_buddy_free(
/*===========*/
buf_pool_t* buf_pool, /*!< in/out: buffer pool in which
the block resides */
void* buf, /*!< in: block to be freed, must not
be pointed to by the buffer pool */
ulint size) /*!< in: block size,
up to srv_page_size */
{
ut_ad(buf_pool_mutex_own(buf_pool));
ut_ad(ut_is_2pow(size));
ut_ad(size >= UNIV_ZIP_SIZE_MIN);
ut_ad(size <= srv_page_size);
buf_buddy_free_low(buf_pool, buf, buf_buddy_get_slot(size));
}
#ifdef UNIV_MATERIALIZE
# undef UNIV_INLINE
# define UNIV_INLINE UNIV_INLINE_ORIGINAL
#endif
|
