Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/restore.cpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
| author | ysr |
|---|---|
| date | Tue, 07 Dec 2010 21:55:53 -0800 |
| parents | f95d63e2154a |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2003, 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 #include "precompiled.hpp" |
| 26 #include "classfile/symbolTable.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "memory/filemap.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "utilities/hashtable.inline.hpp" | |
| 0 | 31 |
| 32 | |
| 33 // Closure for serializing initialization data in from a data area | |
| 34 // (oop_array) read from the shared file. | |
| 35 | |
| 36 class ReadClosure : public SerializeOopClosure { | |
| 37 private: | |
| 38 oop** _oop_array; | |
| 39 | |
| 40 inline oop nextOop() { | |
| 41 return *(*_oop_array)++; | |
| 42 } | |
| 43 | |
| 44 public: | |
| 45 ReadClosure(oop** oop_array) { _oop_array = oop_array; } | |
| 46 | |
| 47 void do_oop(oop* p) { | |
| 48 assert(SharedSkipVerify || *p == NULL || *p == Universe::klassKlassObj(), | |
| 49 "initializing previously initialized oop."); | |
| 50 oop obj = nextOop(); | |
| 51 assert(SharedSkipVerify || (intptr_t)obj >= 0 || (intptr_t)obj < -100, | |
| 52 "hit tag while initializing oops."); | |
| 53 assert(SharedSkipVerify || obj->is_oop_or_null(), "invalid oop"); | |
| 54 *p = obj; | |
| 55 } | |
| 56 | |
|
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57 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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58 |
| 0 | 59 void do_ptr(void** p) { |
| 60 assert(*p == NULL, "initializing previous initialized pointer."); | |
| 61 void* obj = nextOop(); | |
| 62 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, | |
| 63 "hit tag while initializing ptrs."); | |
| 64 *p = obj; | |
| 65 } | |
| 66 | |
| 67 void do_ptr(HeapWord** p) { do_ptr((void **) p); } | |
| 68 | |
| 69 void do_int(int* p) { | |
| 70 *p = (int)(intptr_t)nextOop(); | |
| 71 } | |
| 72 | |
| 73 void do_size_t(size_t* p) { | |
| 74 // Assumes that size_t and pointers are the same size. | |
| 75 *p = (size_t)nextOop(); | |
| 76 } | |
| 77 | |
| 78 void do_tag(int tag) { | |
| 79 int old_tag; | |
| 80 do_int(&old_tag); | |
| 81 FileMapInfo::assert_mark(tag == old_tag); | |
| 82 } | |
| 83 | |
| 84 void do_region(u_char* start, size_t size) { | |
| 85 assert((intptr_t)start % sizeof(oop) == 0, "bad alignment"); | |
| 86 assert(size % sizeof(oop) == 0, "bad size"); | |
| 87 do_tag((int)size); | |
| 88 while (size > 0) { | |
| 89 *(oop*)start = nextOop(); | |
| 90 start += sizeof(oop); | |
| 91 size -= sizeof(oop); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 bool reading() const { return true; } | |
| 96 }; | |
| 97 | |
| 98 | |
| 99 // Read the oop and miscellaneous data from the shared file, and | |
| 100 // serialize it out to its various destinations. | |
| 101 | |
| 102 void CompactingPermGenGen::initialize_oops() { | |
| 103 FileMapInfo *mapinfo = FileMapInfo::current_info(); | |
| 104 | |
| 105 char* buffer = mapinfo->region_base(md); | |
| 106 | |
| 107 // Skip over (reserve space for) a list of addresses of C++ vtables | |
| 108 // for Klass objects. They get filled in later. | |
| 109 | |
| 110 // Skip over (reserve space for) dummy C++ vtables Klass objects. | |
| 111 // They are used as is. | |
| 112 | |
| 113 void** vtbl_list = (void**)buffer; | |
| 114 buffer += vtbl_list_size * sizeof(void*); | |
| 115 intptr_t vtable_size = *(intptr_t*)buffer; | |
| 116 buffer += sizeof(intptr_t); | |
| 117 buffer += vtable_size; | |
| 118 | |
| 119 // Create the symbol table using the bucket array at this spot in the | |
| 120 // misc data space. Since the symbol table is often modified, this | |
| 121 // region (of mapped pages) will be copy-on-write. | |
| 122 | |
| 123 int symbolTableLen = *(intptr_t*)buffer; | |
| 124 buffer += sizeof(intptr_t); | |
| 125 int number_of_entries = *(intptr_t*)buffer; | |
| 126 buffer += sizeof(intptr_t); | |
| 127 SymbolTable::create_table((HashtableBucket*)buffer, symbolTableLen, | |
| 128 number_of_entries); | |
| 129 buffer += symbolTableLen; | |
| 130 | |
| 131 // Create the string table using the bucket array at this spot in the | |
| 132 // misc data space. Since the string table is often modified, this | |
| 133 // region (of mapped pages) will be copy-on-write. | |
| 134 | |
| 135 int stringTableLen = *(intptr_t*)buffer; | |
| 136 buffer += sizeof(intptr_t); | |
| 137 number_of_entries = *(intptr_t*)buffer; | |
| 138 buffer += sizeof(intptr_t); | |
| 139 StringTable::create_table((HashtableBucket*)buffer, stringTableLen, | |
| 140 number_of_entries); | |
| 141 buffer += stringTableLen; | |
| 142 | |
| 143 // Create the shared dictionary using the bucket array at this spot in | |
| 144 // the misc data space. Since the shared dictionary table is never | |
| 145 // modified, this region (of mapped pages) will be (effectively, if | |
| 146 // not explicitly) read-only. | |
| 147 | |
| 148 int sharedDictionaryLen = *(intptr_t*)buffer; | |
| 149 buffer += sizeof(intptr_t); | |
| 150 number_of_entries = *(intptr_t*)buffer; | |
| 151 buffer += sizeof(intptr_t); | |
| 152 SystemDictionary::set_shared_dictionary((HashtableBucket*)buffer, | |
| 153 sharedDictionaryLen, | |
| 154 number_of_entries); | |
| 155 buffer += sharedDictionaryLen; | |
| 156 | |
| 157 // Create the package info table using the bucket array at this spot in | |
| 158 // the misc data space. Since the package info table is never | |
| 159 // modified, this region (of mapped pages) will be (effectively, if | |
| 160 // not explicitly) read-only. | |
| 161 | |
| 162 int pkgInfoLen = *(intptr_t*)buffer; | |
| 163 buffer += sizeof(intptr_t); | |
| 164 number_of_entries = *(intptr_t*)buffer; | |
| 165 buffer += sizeof(intptr_t); | |
| 166 ClassLoader::create_package_info_table((HashtableBucket*)buffer, pkgInfoLen, | |
| 167 number_of_entries); | |
| 168 buffer += pkgInfoLen; | |
| 169 ClassLoader::verify(); | |
| 170 | |
| 171 // The following data in the shared misc data region are the linked | |
| 172 // list elements (HashtableEntry objects) for the symbol table, string | |
| 173 // table, and shared dictionary. The heap objects refered to by the | |
| 174 // symbol table, string table, and shared dictionary are permanent and | |
| 175 // unmovable. Since new entries added to the string and symbol tables | |
| 176 // are always added at the beginning of the linked lists, THESE LINKED | |
| 177 // LIST ELEMENTS ARE READ-ONLY. | |
| 178 | |
| 179 int len = *(intptr_t*)buffer; // skip over symbol table entries | |
| 180 buffer += sizeof(intptr_t); | |
| 181 buffer += len; | |
| 182 | |
| 183 len = *(intptr_t*)buffer; // skip over string table entries | |
| 184 buffer += sizeof(intptr_t); | |
| 185 buffer += len; | |
| 186 | |
| 187 len = *(intptr_t*)buffer; // skip over shared dictionary entries | |
| 188 buffer += sizeof(intptr_t); | |
| 189 buffer += len; | |
| 190 | |
| 191 len = *(intptr_t*)buffer; // skip over package info table entries | |
| 192 buffer += sizeof(intptr_t); | |
| 193 buffer += len; | |
| 194 | |
| 195 len = *(intptr_t*)buffer; // skip over package info table char[] arrays. | |
| 196 buffer += sizeof(intptr_t); | |
| 197 buffer += len; | |
| 198 | |
| 199 oop* oop_array = (oop*)buffer; | |
| 200 ReadClosure rc(&oop_array); | |
| 201 serialize_oops(&rc); | |
| 202 } |