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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*****************************************************************************
Copyright (c) 1995, 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, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file os/os0proc.cc
The interface to the operating system
process control primitives
Created 9/30/1995 Heikki Tuuri
*******************************************************/
#include "univ.i"
/* FreeBSD for example has only MAP_ANON, Linux has MAP_ANONYMOUS and
MAP_ANON but MAP_ANON is marked as deprecated */
#if defined(MAP_ANONYMOUS)
#define OS_MAP_ANON MAP_ANONYMOUS
#elif defined(MAP_ANON)
#define OS_MAP_ANON MAP_ANON
#endif
/** The total amount of memory currently allocated from the operating
system with os_mem_alloc_large(). */
Atomic_counter<ulint> os_total_large_mem_allocated;
/** Whether to use large pages in the buffer pool */
my_bool os_use_large_pages;
/** Large page size. This may be a boot-time option on some platforms */
uint os_large_page_size;
/** Converts the current process id to a number.
@return process id as a number */
ulint
os_proc_get_number(void)
/*====================*/
{
#ifdef _WIN32
return(static_cast<ulint>(GetCurrentProcessId()));
#else
return(static_cast<ulint>(getpid()));
#endif
}
/** Allocates large pages memory.
@param[in,out] n Number of bytes to allocate
@return allocated memory */
void*
os_mem_alloc_large(
ulint* n)
{
void* ptr;
ulint size;
#if defined HAVE_LINUX_LARGE_PAGES && defined UNIV_LINUX
int shmid;
struct shmid_ds buf;
if (!os_use_large_pages || !os_large_page_size) {
goto skip;
}
/* Align block size to os_large_page_size */
ut_ad(ut_is_2pow(os_large_page_size));
size = ut_2pow_round(*n + (os_large_page_size - 1),
os_large_page_size);
shmid = shmget(IPC_PRIVATE, (size_t) size, SHM_HUGETLB | SHM_R | SHM_W);
if (shmid < 0) {
ib::warn() << "Failed to allocate " << size
<< " bytes. errno " << errno;
ptr = NULL;
} else {
ptr = shmat(shmid, NULL, 0);
if (ptr == (void*)-1) {
ib::warn() << "Failed to attach shared memory segment,"
" errno " << errno;
ptr = NULL;
}
/* Remove the shared memory segment so that it will be
automatically freed after memory is detached or
process exits */
shmctl(shmid, IPC_RMID, &buf);
}
if (ptr) {
*n = size;
os_total_large_mem_allocated += size;
UNIV_MEM_ALLOC(ptr, size);
return(ptr);
}
ib::warn() << "Using conventional memory pool";
skip:
#endif /* HAVE_LINUX_LARGE_PAGES && UNIV_LINUX */
#ifdef _WIN32
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
/* Align block size to system page size */
ut_ad(ut_is_2pow(system_info.dwPageSize));
/* system_info.dwPageSize is only 32-bit. Casting to ulint is required
on 64-bit Windows. */
size = *n = ut_2pow_round(*n + (system_info.dwPageSize - 1),
(ulint) system_info.dwPageSize);
ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE);
if (!ptr) {
ib::info() << "VirtualAlloc(" << size << " bytes) failed;"
" Windows error " << GetLastError();
} else {
os_total_large_mem_allocated += size;
UNIV_MEM_ALLOC(ptr, size);
}
#else
size = getpagesize();
/* Align block size to system page size */
ut_ad(ut_is_2pow(size));
size = *n = ut_2pow_round(*n + (size - 1), size);
ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | OS_MAP_ANON, -1, 0);
if (UNIV_UNLIKELY(ptr == (void*) -1)) {
ib::error() << "mmap(" << size << " bytes) failed;"
" errno " << errno;
ptr = NULL;
} else {
os_total_large_mem_allocated += size;
UNIV_MEM_ALLOC(ptr, size);
}
#endif
return(ptr);
}
/** Frees large pages memory.
@param[in] ptr pointer returned by os_mem_alloc_large()
@param[in] size size returned by os_mem_alloc_large() */
void
os_mem_free_large(
void *ptr,
ulint size)
{
ut_a(os_total_large_mem_allocated >= size);
#if defined HAVE_LINUX_LARGE_PAGES && defined UNIV_LINUX
if (os_use_large_pages && os_large_page_size && !shmdt(ptr)) {
os_total_large_mem_allocated -= size;
return;
}
#endif /* HAVE_LINUX_LARGE_PAGES && UNIV_LINUX */
#ifdef _WIN32
/* When RELEASE memory, the size parameter must be 0.
Do not use MEM_RELEASE with MEM_DECOMMIT. */
if (!VirtualFree(ptr, 0, MEM_RELEASE)) {
ib::error() << "VirtualFree(" << ptr << ", " << size
<< ") failed; Windows error " << GetLastError();
} else {
os_total_large_mem_allocated -= size;
}
#elif !defined OS_MAP_ANON
ut_free(ptr);
#else
# if defined(UNIV_SOLARIS)
if (munmap(static_cast<caddr_t>(ptr), size)) {
# else
if (munmap(ptr, size)) {
# endif /* UNIV_SOLARIS */
ib::error() << "munmap(" << ptr << ", " << size << ") failed;"
" errno " << errno;
} else {
os_total_large_mem_allocated -= size;
}
#endif
}
|
