Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/heapInspection.hpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
| author | ysr |
|---|---|
| date | Wed, 16 Mar 2011 10:37:08 -0700 |
| parents | f95d63e2154a |
| children | d2a62e0f25eb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2002, 2010, 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_HEAPINSPECTION_HPP |
| 26 #define SHARE_VM_MEMORY_HEAPINSPECTION_HPP | |
| 27 | |
| 28 #include "memory/allocation.inline.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 | |
| 0 | 31 #ifndef SERVICES_KERNEL |
| 32 | |
| 33 | |
| 34 // HeapInspection | |
| 35 | |
| 36 // KlassInfoTable is a bucket hash table that | |
| 37 // maps klassOops to extra information: | |
| 38 // instance count and instance word size. | |
| 39 // | |
| 40 // A KlassInfoBucket is the head of a link list | |
| 41 // of KlassInfoEntry's | |
| 42 // | |
| 43 // KlassInfoHisto is a growable array of pointers | |
| 44 // to KlassInfoEntry's and is used to sort | |
| 45 // the entries. | |
| 46 | |
| 47 class KlassInfoEntry: public CHeapObj { | |
| 48 private: | |
| 49 KlassInfoEntry* _next; | |
| 50 klassOop _klass; | |
| 51 long _instance_count; | |
| 52 size_t _instance_words; | |
| 53 | |
| 54 public: | |
| 55 KlassInfoEntry(klassOop k, KlassInfoEntry* next) : | |
| 56 _klass(k), _instance_count(0), _instance_words(0), _next(next) | |
| 57 {} | |
| 58 KlassInfoEntry* next() { return _next; } | |
| 59 bool is_equal(klassOop k) { return k == _klass; } | |
| 60 klassOop klass() { return _klass; } | |
| 61 long count() { return _instance_count; } | |
| 62 void set_count(long ct) { _instance_count = ct; } | |
| 63 size_t words() { return _instance_words; } | |
| 64 void set_words(size_t wds) { _instance_words = wds; } | |
| 65 int compare(KlassInfoEntry* e1, KlassInfoEntry* e2); | |
| 66 void print_on(outputStream* st) const; | |
| 67 }; | |
| 68 | |
| 69 class KlassInfoClosure: public StackObj { | |
| 70 public: | |
| 71 // Called for each KlassInfoEntry. | |
| 72 virtual void do_cinfo(KlassInfoEntry* cie) = 0; | |
| 73 }; | |
| 74 | |
| 75 class KlassInfoBucket: public CHeapObj { | |
| 76 private: | |
| 77 KlassInfoEntry* _list; | |
| 78 KlassInfoEntry* list() { return _list; } | |
| 79 void set_list(KlassInfoEntry* l) { _list = l; } | |
| 80 public: | |
| 81 KlassInfoEntry* lookup(const klassOop k); | |
| 82 void initialize() { _list = NULL; } | |
| 83 void empty(); | |
| 84 void iterate(KlassInfoClosure* cic); | |
| 85 }; | |
| 86 | |
| 87 class KlassInfoTable: public StackObj { | |
| 88 private: | |
| 89 int _size; | |
| 90 | |
| 91 // An aligned reference address (typically the least | |
| 92 // address in the perm gen) used for hashing klass | |
| 93 // objects. | |
| 94 HeapWord* _ref; | |
| 95 | |
| 96 KlassInfoBucket* _buckets; | |
| 97 uint hash(klassOop p); | |
| 98 KlassInfoEntry* lookup(const klassOop k); | |
| 99 | |
| 100 public: | |
| 101 // Table size | |
| 102 enum { | |
| 103 cit_size = 20011 | |
| 104 }; | |
| 105 KlassInfoTable(int size, HeapWord* ref); | |
| 106 ~KlassInfoTable(); | |
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107 bool record_instance(const oop obj); |
| 0 | 108 void iterate(KlassInfoClosure* cic); |
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109 bool allocation_failed() { return _buckets == NULL; } |
| 0 | 110 }; |
| 111 | |
| 112 class KlassInfoHisto : public StackObj { | |
| 113 private: | |
| 114 GrowableArray<KlassInfoEntry*>* _elements; | |
| 115 GrowableArray<KlassInfoEntry*>* elements() const { return _elements; } | |
| 116 const char* _title; | |
| 117 const char* title() const { return _title; } | |
| 118 static int sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2); | |
| 119 void print_elements(outputStream* st) const; | |
| 120 public: | |
| 121 enum { | |
| 122 histo_initial_size = 1000 | |
| 123 }; | |
| 124 KlassInfoHisto(const char* title, | |
| 125 int estimatedCount); | |
| 126 ~KlassInfoHisto(); | |
| 127 void add(KlassInfoEntry* cie); | |
| 128 void print_on(outputStream* st) const; | |
| 129 void sort(); | |
| 130 }; | |
| 131 | |
| 132 #endif // SERVICES_KERNEL | |
| 133 | |
| 134 class HeapInspection : public AllStatic { | |
| 135 public: | |
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136 static void heap_inspection(outputStream* st, bool need_prologue) KERNEL_RETURN; |
| 0 | 137 static void find_instances_at_safepoint(klassOop k, GrowableArray<oop>* result) KERNEL_RETURN; |
| 138 }; | |
| 1972 | 139 |
| 140 #endif // SHARE_VM_MEMORY_HEAPINSPECTION_HPP |