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
32G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults),
33 _use_adaptive_sizing(true), _min_desired_young_length(0), _max_desired_young_length(0) {
34
35 if (FLAG_IS_CMDLINE(NewRatio)) {
36 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) {
37 log_warning(gc, ergo)("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio");
38 } else {
39 _sizer_kind = SizerNewRatio;
40 _use_adaptive_sizing = false;
41 return;
42 }
43 }
44
45 if (NewSize > MaxNewSize) {
46 if (FLAG_IS_CMDLINE(MaxNewSize)) {
47 log_warning(gc, ergo)("NewSize (" SIZE_FORMAT "k) is greater than the MaxNewSize (" SIZE_FORMAT "k). "
48 "A new max generation size of " SIZE_FORMAT "k will be used.",
49 NewSize/K, MaxNewSize/K, NewSize/K);
50 }
51 FLAG_SET_ERGO(MaxNewSize, NewSize);
52 }
53
54 if (FLAG_IS_CMDLINE(NewSize)) {
55 _min_desired_young_length = MAX2((uint) (NewSize / HeapRegion::GrainBytes),
56 1U);
57 if (FLAG_IS_CMDLINE(MaxNewSize)) {
58 _max_desired_young_length =
59 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes),
60 1U);
61 _sizer_kind = SizerMaxAndNewSize;
62 _use_adaptive_sizing = _min_desired_young_length != _max_desired_young_length;
63 } else {
64 _sizer_kind = SizerNewSizeOnly;
65 }
66 } else if (FLAG_IS_CMDLINE(MaxNewSize)) {
67 _max_desired_young_length =
68 MAX2((uint) (MaxNewSize / HeapRegion::GrainBytes),
69 1U);
70 _sizer_kind = SizerMaxNewSizeOnly;
71 }
72}
73
74uint G1YoungGenSizer::calculate_default_min_length(uint new_number_of_heap_regions) {
75 uint default_value = (new_number_of_heap_regions * G1NewSizePercent) / 100;
76 return MAX2(1U, default_value);
77}
78
79uint G1YoungGenSizer::calculate_default_max_length(uint new_number_of_heap_regions) {
80 uint default_value = (new_number_of_heap_regions * G1MaxNewSizePercent) / 100;
81 return MAX2(1U, default_value);
82}
83
84void G1YoungGenSizer::recalculate_min_max_young_length(uint number_of_heap_regions, uint* min_young_length, uint* max_young_length) {
85 assert(number_of_heap_regions > 0, "Heap must be initialized");
86
87 switch (_sizer_kind) {
88 case SizerDefaults:
89 *min_young_length = calculate_default_min_length(number_of_heap_regions);
90 *max_young_length = calculate_default_max_length(number_of_heap_regions);
91 break;
92 case SizerNewSizeOnly:
93 *max_young_length = calculate_default_max_length(number_of_heap_regions);
94 *max_young_length = MAX2(*min_young_length, *max_young_length);
95 break;
96 case SizerMaxNewSizeOnly:
97 *min_young_length = calculate_default_min_length(number_of_heap_regions);
98 *min_young_length = MIN2(*min_young_length, *max_young_length);
99 break;
100 case SizerMaxAndNewSize:
101 // Do nothing. Values set on the command line, don't update them at runtime.
102 break;
103 case SizerNewRatio:
104 *min_young_length = number_of_heap_regions / (NewRatio + 1);
105 *max_young_length = *min_young_length;
106 break;
107 default:
108 ShouldNotReachHere();
109 }
110
111 assert(*min_young_length <= *max_young_length, "Invalid min/max young gen size values");
112}
113
114void G1YoungGenSizer::adjust_max_new_size(uint number_of_heap_regions) {
115
116 // We need to pass the desired values because recalculation may not update these
117 // values in some cases.
118 uint temp = _min_desired_young_length;
119 uint result = _max_desired_young_length;
120 recalculate_min_max_young_length(number_of_heap_regions, &temp, &result);
121
122 size_t max_young_size = result * HeapRegion::GrainBytes;
123 if (max_young_size != MaxNewSize) {
124 FLAG_SET_ERGO(MaxNewSize, max_young_size);
125 }
126}
127
128void G1YoungGenSizer::heap_size_changed(uint new_number_of_heap_regions) {
129 recalculate_min_max_young_length(new_number_of_heap_regions, &_min_desired_young_length,
130 &_max_desired_young_length);
131}
132
133G1YoungGenSizer* G1YoungGenSizer::create_gen_sizer() {
134 if (G1Arguments::is_heterogeneous_heap()) {
135 return new G1HeterogeneousHeapYoungGenSizer();
136 } else {
137 return new G1YoungGenSizer();
138 }
139}
140