blob: 15222fac01ad8d89755db898d58b3913fec63cc2 (
plain)
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
|
// extent_manager.cpp
/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/storage/mmap_v1/extent_manager.h"
#include "mongo/db/storage/mmap_v1/extent.h"
namespace mongo {
int ExtentManager::quantizeExtentSize(int size) const {
if (size == maxSize()) {
// no point doing quantizing for the entire file
return size;
}
invariant(size <= maxSize());
// make sizes align with VM page size
int newSize = (size + 0xfff) & 0xfffff000;
if (newSize > maxSize()) {
return maxSize();
}
if (newSize < minSize()) {
return minSize();
}
return newSize;
}
int ExtentManager::followupSize(int len, int lastExtentLen) const {
invariant(len < maxSize());
int x = initialSize(len);
// changed from 1.20 to 1.35 in v2.1.x to get to larger extent size faster
int y = (int)(lastExtentLen < 4000000 ? lastExtentLen * 4.0 : lastExtentLen * 1.35);
int sz = y > x ? y : x;
if (sz < lastExtentLen) {
// this means there was an int overflow
// so we should turn it into maxSize
return maxSize();
} else if (sz > maxSize()) {
return maxSize();
}
sz = quantizeExtentSize(sz);
verify(sz >= len);
return sz;
}
int ExtentManager::initialSize(int len) const {
invariant(len <= maxSize());
long long sz = len * 16;
if (len < 1000)
sz = len * 64;
if (sz >= maxSize())
return maxSize();
if (sz <= minSize())
return minSize();
int z = ExtentManager::quantizeExtentSize(sz);
verify(z >= len);
return z;
}
}
|
