Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/asPSOldGen.cpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
parents | 52b4284cb496 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/asPSOldGen.hpp" | |
27 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
28 #include "gc_implementation/parallelScavenge/psAdaptiveSizePolicy.hpp" | |
29 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
30 #include "memory/cardTableModRefBS.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/java.hpp" | |
0 | 33 |
34 // Whereas PSOldGen takes the maximum size of the generation | |
35 // (which doesn't change in the case of PSOldGen) as a parameter, | |
36 // ASPSOldGen takes the upper limit on the size of | |
37 // the generation as a parameter. In ASPSOldGen the | |
38 // maximum size of the generation can change as the boundary | |
39 // moves. The "maximum size of the generation" is still a valid | |
40 // concept since the generation can grow and shrink within that | |
41 // maximum. There are lots of useful checks that use that | |
42 // maximum. In PSOldGen the method max_gen_size() returns | |
43 // _max_gen_size (as set by the PSOldGen constructor). This | |
44 // is how it always worked. In ASPSOldGen max_gen_size() | |
45 // returned the size of the reserved space for the generation. | |
46 // That can change as the boundary moves. Below the limit of | |
47 // the size of the generation is passed to the PSOldGen constructor | |
48 // for "_max_gen_size" (have to pass something) but it is not used later. | |
49 // | |
50 ASPSOldGen::ASPSOldGen(size_t initial_size, | |
51 size_t min_size, | |
52 size_t size_limit, | |
53 const char* gen_name, | |
54 int level) : | |
55 PSOldGen(initial_size, min_size, size_limit, gen_name, level), | |
56 _gen_size_limit(size_limit) | |
57 {} | |
58 | |
59 ASPSOldGen::ASPSOldGen(PSVirtualSpace* vs, | |
60 size_t initial_size, | |
61 size_t min_size, | |
62 size_t size_limit, | |
63 const char* gen_name, | |
64 int level) : | |
65 PSOldGen(initial_size, min_size, size_limit, gen_name, level), | |
66 _gen_size_limit(size_limit) | |
67 { | |
68 _virtual_space = vs; | |
69 } | |
70 | |
11038 | 71 void ASPSOldGen::initialize_work(const char* perf_data_name, int level) { |
72 PSOldGen::initialize_work(perf_data_name, level); | |
73 | |
74 // The old gen can grow to gen_size_limit(). _reserve reflects only | |
75 // the current maximum that can be committed. | |
76 assert(_reserved.byte_size() <= gen_size_limit(), "Consistency check"); | |
77 | |
78 initialize_performance_counters(perf_data_name, level); | |
79 } | |
80 | |
0 | 81 void ASPSOldGen::reset_after_change() { |
82 _reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), | |
83 (HeapWord*)virtual_space()->high_boundary()); | |
84 post_resize(); | |
85 } | |
86 | |
87 | |
88 size_t ASPSOldGen::available_for_expansion() { | |
89 assert(virtual_space()->is_aligned(gen_size_limit()), "not aligned"); | |
90 assert(gen_size_limit() >= virtual_space()->committed_size(), "bad gen size"); | |
91 | |
92 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
93 size_t result = gen_size_limit() - virtual_space()->committed_size(); | |
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94 size_t result_aligned = align_size_down(result, heap->generation_alignment()); |
0 | 95 return result_aligned; |
96 } | |
97 | |
98 size_t ASPSOldGen::available_for_contraction() { | |
99 size_t uncommitted_bytes = virtual_space()->uncommitted_size(); | |
100 if (uncommitted_bytes != 0) { | |
101 return uncommitted_bytes; | |
102 } | |
103 | |
104 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
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105 const size_t gen_alignment = heap->generation_alignment(); |
0 | 106 PSAdaptiveSizePolicy* policy = heap->size_policy(); |
107 const size_t working_size = | |
108 used_in_bytes() + (size_t) policy->avg_promoted()->padded_average(); | |
109 const size_t working_aligned = align_size_up(working_size, gen_alignment); | |
110 const size_t working_or_min = MAX2(working_aligned, min_gen_size()); | |
111 if (working_or_min > reserved().byte_size()) { | |
112 // If the used or minimum gen size (aligned up) is greater | |
113 // than the total reserved size, then the space available | |
114 // for contraction should (after proper alignment) be 0 | |
115 return 0; | |
116 } | |
117 const size_t max_contraction = | |
118 reserved().byte_size() - working_or_min; | |
119 | |
120 // Use the "increment" fraction instead of the "decrement" fraction | |
121 // to allow the other gen to expand more aggressively. The | |
122 // "decrement" fraction is conservative because its intent is to | |
123 // only reduce the footprint. | |
124 | |
125 size_t result = policy->promo_increment_aligned_down(max_contraction); | |
126 // Also adjust for inter-generational alignment | |
127 size_t result_aligned = align_size_down(result, gen_alignment); | |
128 if (PrintAdaptiveSizePolicy && Verbose) { | |
129 gclog_or_tty->print_cr("\nASPSOldGen::available_for_contraction:" | |
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130 " " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX, (result_aligned/K), result_aligned); |
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131 gclog_or_tty->print_cr(" reserved().byte_size() " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX " ", |
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132 (reserved().byte_size()/K), reserved().byte_size()); |
0 | 133 size_t working_promoted = (size_t) policy->avg_promoted()->padded_average(); |
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134 gclog_or_tty->print_cr(" padded promoted " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX, |
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135 (working_promoted/K), working_promoted); |
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136 gclog_or_tty->print_cr(" used " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX, |
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137 (used_in_bytes()/K), used_in_bytes()); |
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138 gclog_or_tty->print_cr(" min_gen_size() " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX, |
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139 (min_gen_size()/K), min_gen_size()); |
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140 gclog_or_tty->print_cr(" max_contraction " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX, |
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141 (max_contraction/K), max_contraction); |
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142 gclog_or_tty->print_cr(" without alignment " SSIZE_FORMAT " K / " SIZE_FORMAT_HEX, |
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143 (policy->promo_increment(max_contraction)/K), |
0 | 144 policy->promo_increment(max_contraction)); |
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145 gclog_or_tty->print_cr(" alignment " SIZE_FORMAT_HEX, gen_alignment); |
0 | 146 } |
147 assert(result_aligned <= max_contraction, "arithmetic is wrong"); | |
148 return result_aligned; | |
149 } |