1 /*
2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/g1/g1Arguments.hpp"
27 #include "gc/g1/g1HeterogeneousHeapYoungGenSizer.hpp"
28 #include "gc/g1/g1YoungGenSizer.hpp"
29 #include "gc/g1/heapRegion.hpp"
30 #include "logging/log.hpp"
31 #include "runtime/globals_extension.hpp"
32
33 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults),
34 _use_adaptive_sizing(true), _min_desired_young_length(0), _max_desired_young_length(0) {
35
36 if (FLAG_IS_CMDLINE(NewRatio)) {
37 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) {
38 log_warning(gc, ergo)("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio");
39 } else {
40 _sizer_kind = SizerNewRatio;
41 _use_adaptive_sizing = false;
42 return;
43 }
44 }
45
46 if (NewSize > MaxNewSize) {
47 if (FLAG_IS_CMDLINE(MaxNewSize)) {
48 log_warning(gc, ergo)("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). "
49 "A new max generation size of " SIZE_FORMAT "k will be used.",
50 NewSize/K, MaxNewSize/K, NewSize/K);
51 }
52 FLAG_SET_ERGO(MaxNewSize, NewSize);
53 }
54
55 if (FLAG_IS_CMDLINE(NewSize)) {
56 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes),
57 1U);
58 if (FLAG_IS_CMDLINE(MaxNewSize)) {
59 _max_desired_young_length =
60 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes),
61 1U);
62 _sizer_kind = SizerMaxAndNewSize;
63 _use_adaptive_sizing = _min_desired_young_length != _max_desired_young_length;
64 } else {
65 _sizer_kind = SizerNewSizeOnly;
66 }
67 } else if (FLAG_IS_CMDLINE(MaxNewSize)) {
68 _max_desired_young_length =
69 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes),
70 1U);
71 _sizer_kind = SizerMaxNewSizeOnly;
72 }
73 }
74
75 uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) {
76 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100;
77 return MAX2(1U, default_value);
78 }
79
80 uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) {
81 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100;
82 return MAX2(1U, default_value);
83 }
84
85 void G1YoungGenSizer::recalculate_min_max_young_length(uint number_of_heap_regions, uint* min_young_length, uint* max_young_length) {
86 assert(number_of_heap_regions > 0, "Heap must be initialized");
87
88 switch (_sizer_kind) {
89 case SizerDefaults:
90 *min_young_length = calculate_default_min_length(number_of_heap_regions);
91 *max_young_length = calculate_default_max_length(number_of_heap_regions);
92 break;
93 case SizerNewSizeOnly:
94 *max_young_length = calculate_default_max_length(number_of_heap_regions);
95 *max_young_length = MAX2(*min_young_length, *max_young_length);
96 break;
97 case SizerMaxNewSizeOnly:
98 *min_young_length = calculate_default_min_length(number_of_heap_regions);
99 *min_young_length = MIN2(*min_young_length, *max_young_length);
100 break;
101 case SizerMaxAndNewSize:
102 // Do nothing. Values set on the command line, don't update them at runtime.
103 break;
104 case SizerNewRatio:
105 *min_young_length = number_of_heap_regions / (NewRatio + 1);
106 *max_young_length = *min_young_length;
107 break;
108 default:
109 ShouldNotReachHere();
110 }
111
112 assert(*min_young_length <= *max_young_length, "Invalid min/max young gen size values");
113 }
114
115 void G1YoungGenSizer::adjust_max_new_size(uint number_of_heap_regions) {
116
117 // We need to pass the desired values because recalculation may not update these
118 // values in some cases.
119 uint temp = _min_desired_young_length;
120 uint result = _max_desired_young_length;
121 recalculate_min_max_young_length(number_of_heap_regions, &temp, &result);
122
123 size_t max_young_size = result * HeapRegion::GrainBytes;
124 if (max_young_size != MaxNewSize) {
125 FLAG_SET_ERGO(MaxNewSize, max_young_size);
126 }
127 }
128
129 void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) {
130 recalculate_min_max_young_length(new_number_of_heap_regions, &_min_desired_young_length,
131 &_max_desired_young_length);
132 }
133
134 G1YoungGenSizer* G1YoungGenSizer::create_gen_sizer() {
135 if (G1Arguments::is_heterogeneous_heap()) {
136 return new G1HeterogeneousHeapYoungGenSizer();
137 } else {
138 return new G1YoungGenSizer();
139 }
140 }