Mercurial > hg > truffle
annotate src/share/vm/memory/genRemSet.hpp @ 14697:bac9ef65b71d
8035057: NewSize ergonomics wrong when setting small or unaligned size on command line
Summary: Making sure that if NewSize is set on the command line it should be used for both min and initial size even if it is re-aligned.
Reviewed-by: jwilhelm, jmasa
| author | sjohanss |
|---|---|
| date | Fri, 21 Feb 2014 09:48:52 +0100 |
| parents | 63a4eb8bcd23 |
| children | 4ca6dc0799b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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 #ifndef SHARE_VM_MEMORY_GENREMSET_HPP |
| 26 #define SHARE_VM_MEMORY_GENREMSET_HPP | |
| 27 | |
| 28 #include "oops/oop.hpp" | |
| 29 | |
| 14309 | 30 // A GenRemSet provides ways of iterating over pointers across generations. |
| 0 | 31 // (This is especially useful for older-to-younger.) |
| 32 | |
| 33 class Generation; | |
| 34 class BarrierSet; | |
| 35 class OopsInGenClosure; | |
| 36 class CardTableRS; | |
| 37 | |
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38 // Helper to remember modified oops in all klasses. |
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39 class KlassRemSet { |
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40 bool _accumulate_modified_oops; |
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41 public: |
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42 KlassRemSet() : _accumulate_modified_oops(false) {} |
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43 void set_accumulate_modified_oops(bool value) { _accumulate_modified_oops = value; } |
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44 bool accumulate_modified_oops() { return _accumulate_modified_oops; } |
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45 bool mod_union_is_clear(); |
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46 void clear_mod_union(); |
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47 }; |
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48 |
| 6197 | 49 class GenRemSet: public CHeapObj<mtGC> { |
| 0 | 50 friend class Generation; |
| 51 | |
| 52 BarrierSet* _bs; | |
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53 KlassRemSet _klass_rem_set; |
| 0 | 54 |
| 55 public: | |
| 56 GenRemSet(BarrierSet * bs) : _bs(bs) {} | |
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57 GenRemSet() : _bs(NULL) {} |
| 0 | 58 |
| 59 // These are for dynamic downcasts. Unfortunately that it names the | |
| 60 // possible subtypes (but not that they are subtypes!) Return NULL if | |
| 14309 | 61 // the cast is invalid. |
| 0 | 62 virtual CardTableRS* as_CardTableRS() { return NULL; } |
| 63 | |
| 64 // Return the barrier set associated with "this." | |
| 65 BarrierSet* bs() { return _bs; } | |
| 66 | |
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67 // Set the barrier set. |
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68 void set_bs(BarrierSet* bs) { _bs = bs; } |
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69 |
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70 KlassRemSet* klass_rem_set() { return &_klass_rem_set; } |
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71 |
| 0 | 72 // Do any (sequential) processing necessary to prepare for (possibly |
| 73 // "parallel", if that arg is true) calls to younger_refs_iterate. | |
| 74 virtual void prepare_for_younger_refs_iterate(bool parallel) = 0; | |
| 75 | |
| 76 // Apply the "do_oop" method of "blk" to (exactly) all oop locations | |
| 77 // 1) that are in objects allocated in "g" at the time of the last call | |
| 78 // to "save_Marks", and | |
| 79 // 2) that point to objects in younger generations. | |
| 80 virtual void younger_refs_iterate(Generation* g, OopsInGenClosure* blk) = 0; | |
| 81 | |
| 82 virtual void younger_refs_in_space_iterate(Space* sp, | |
| 83 OopsInGenClosure* cl) = 0; | |
| 84 | |
| 85 // This method is used to notify the remembered set that "new_val" has | |
| 86 // been written into "field" by the garbage collector. | |
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87 void write_ref_field_gc(void* field, oop new_val); |
| 0 | 88 protected: |
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89 virtual void write_ref_field_gc_work(void* field, oop new_val) = 0; |
| 0 | 90 public: |
| 91 | |
| 92 // A version of the above suitable for use by parallel collectors. | |
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93 virtual void write_ref_field_gc_par(void* field, oop new_val) = 0; |
| 0 | 94 |
| 95 // Resize one of the regions covered by the remembered set. | |
| 96 virtual void resize_covered_region(MemRegion new_region) = 0; | |
| 97 | |
| 98 // If the rem set imposes any alignment restrictions on boundaries | |
| 99 // within the heap, this function tells whether they are met. | |
| 100 virtual bool is_aligned(HeapWord* addr) = 0; | |
| 101 | |
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102 // Returns any alignment constraint that the remembered set imposes upon the |
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103 // heap. |
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104 static uintx max_alignment_constraint(); |
| 0 | 105 |
| 106 virtual void verify() = 0; | |
| 107 | |
| 108 // Verify that the remembered set has no entries for | |
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109 // the heap interval denoted by mr. If there are any |
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110 // alignment constraints on the remembered set, only the |
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111 // part of the region that is aligned is checked. |
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112 // |
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113 // alignment boundaries |
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114 // +--------+-------+--------+-------+ |
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115 // [ region mr ) |
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116 // [ part checked ) |
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117 virtual void verify_aligned_region_empty(MemRegion mr) = 0; |
| 0 | 118 |
| 119 // If appropriate, print some information about the remset on "tty". | |
| 120 virtual void print() {} | |
| 121 | |
| 122 // Informs the RS that the given memregion contains no references to | |
| 123 // younger generations. | |
| 124 virtual void clear(MemRegion mr) = 0; | |
| 125 | |
| 126 // Informs the RS that there are no references to generations | |
| 127 // younger than gen from generations gen and older. | |
| 128 // The parameter clear_perm indicates if the perm_gen's | |
| 129 // remembered set should also be processed/cleared. | |
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130 virtual void clear_into_younger(Generation* old_gen) = 0; |
| 0 | 131 |
| 132 // Informs the RS that refs in the given "mr" may have changed | |
| 133 // arbitrarily, and therefore may contain old-to-young pointers. | |
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134 // If "whole heap" is true, then this invalidation is part of an |
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135 // invalidation of the whole heap, which an implementation might |
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136 // handle differently than that of a sub-part of the heap. |
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137 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0; |
| 0 | 138 |
| 139 // Informs the RS that refs in this generation | |
| 140 // may have changed arbitrarily, and therefore may contain | |
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141 // old-to-young pointers in arbitrary locations. |
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142 virtual void invalidate_or_clear(Generation* old_gen) = 0; |
| 0 | 143 }; |
| 1972 | 144 |
| 145 #endif // SHARE_VM_MEMORY_GENREMSET_HPP |