author | stuefe |
Mon, 21 Oct 2019 16:43:06 +0200 | |
branch | stuefe-new-metaspace-branch |
changeset 58716 | 960e372a6065 |
parent 58381 | 5f5558a1a113 |
child 58807 | 3863dfd99d8e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2019, SAP SE. All rights reserved. |
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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|
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#include "memory/metaspace/chunkAllocSequence.hpp" |
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#include "memory/metaspace/chunkLevel.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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|
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namespace metaspace { |
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|
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// A chunk allocation sequence which can be encoded with a simple const array. |
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class ConstantChunkAllocSequence : public ChunkAllocSequence { |
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|
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// integer array specifying chunk level allocation progression. |
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// Last chunk is to be an endlessly repeated allocation. |
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const chklvl_t* const _entries; |
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const int _num_entries; |
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|
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public: |
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|
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ConstantChunkAllocSequence(const chklvl_t* array, int num_entries) |
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: _entries(array) |
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, _num_entries(num_entries) |
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{ |
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assert(_num_entries > 0, "must not be empty."); |
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} |
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|
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chklvl_t get_next_chunk_level(int num_allocated) const { |
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if (num_allocated >= _num_entries) { |
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// Caller shall repeat last allocation |
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return _entries[_num_entries - 1]; |
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} |
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return _entries[num_allocated]; |
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} |
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|
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}; |
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|
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// hard-coded chunk allocation sequences for various space types |
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|
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/////////////////////////// |
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// chunk allocation sequences for normal loaders: |
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static const chklvl_t g_sequ_standard_non_class[] = { |
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chklvl::CHUNK_LEVEL_4K, |
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chklvl::CHUNK_LEVEL_4K, |
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chklvl::CHUNK_LEVEL_4K, |
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chklvl::CHUNK_LEVEL_4K, |
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chklvl::CHUNK_LEVEL_64K |
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// .. repeat last |
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}; |
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|
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static const chklvl_t g_sequ_standard_class[] = { |
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chklvl::CHUNK_LEVEL_2K, |
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chklvl::CHUNK_LEVEL_2K, |
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chklvl::CHUNK_LEVEL_2K, |
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chklvl::CHUNK_LEVEL_2K, |
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chklvl::CHUNK_LEVEL_32K |
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// .. repeat last |
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}; |
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|
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/////////////////////////// |
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// chunk allocation sequences for reflection/anonymous loaders: |
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// We allocate four smallish chunks before progressing to bigger chunks. |
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static const chklvl_t g_sequ_anon_non_class[] = { |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_2K |
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// .. repeat last |
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}; |
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static const chklvl_t g_sequ_anon_class[] = { |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_1K, |
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chklvl::CHUNK_LEVEL_2K |
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// .. repeat last |
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}; |
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#define DEFINE_CLASS_FOR_ARRAY(what) \ |
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static ConstantChunkAllocSequence g_chunk_alloc_sequence_##what (g_sequ_##what, sizeof(g_sequ_##what)/sizeof(chklvl_t)); |
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DEFINE_CLASS_FOR_ARRAY(standard_non_class) |
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DEFINE_CLASS_FOR_ARRAY(standard_class) |
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DEFINE_CLASS_FOR_ARRAY(anon_non_class) |
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DEFINE_CLASS_FOR_ARRAY(anon_class) |
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class BootLoaderChunkAllocSequence : public ChunkAllocSequence { |
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|
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// For now, this mirrors what the old code did |
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// (see SpaceManager::get_initial_chunk_size() and SpaceManager::calc_chunk_size). |
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|
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// Not sure how much sense this still makes, especially with CDS - by default we |
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// now load JDK classes from CDS and therefore most of the boot loader |
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// chunks remain unoccupied. |
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|
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// Also, InitialBootClassLoaderMetaspaceSize was/is confusing since it only applies |
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// to the non-class chunk. |
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const bool _is_class; |
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static chklvl_t calc_initial_chunk_level(bool is_class) { |
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|
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size_t word_size = 0; |
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if (is_class) { |
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// In the old version first class space chunk for boot loader was always medium class chunk size * 6. |
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word_size = (32 * K * 6) / BytesPerWord; |
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132 |
|
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133 |
} else { |
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134 |
//assert(InitialBootClassLoaderMetaspaceSize < chklvl::MAX_CHUNK_BYTE_SIZE, |
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135 |
// "InitialBootClassLoaderMetaspaceSize too large"); |
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word_size = MIN2(InitialBootClassLoaderMetaspaceSize, |
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137 |
chklvl::MAX_CHUNK_BYTE_SIZE) / BytesPerWord; |
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138 |
} |
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139 |
return chklvl::level_fitting_word_size(word_size); |
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140 |
} |
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141 |
|
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142 |
public: |
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143 |
|
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144 |
BootLoaderChunkAllocSequence(bool is_class) |
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: _is_class(is_class) |
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146 |
{} |
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147 |
|
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chklvl_t get_next_chunk_level(int num_allocated) const { |
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149 |
if (num_allocated == 0) { |
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return calc_initial_chunk_level(_is_class); |
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151 |
} |
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// bit arbitrary, but this is what the old code did. Can tweak later if needed. |
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153 |
return chklvl::CHUNK_LEVEL_64K; |
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154 |
} |
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155 |
|
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156 |
}; |
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157 |
|
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158 |
static BootLoaderChunkAllocSequence g_chunk_alloc_sequence_boot_non_class(false); |
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static BootLoaderChunkAllocSequence g_chunk_alloc_sequence_boot_class(true); |
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160 |
|
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161 |
|
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162 |
const ChunkAllocSequence* ChunkAllocSequence::alloc_sequence_by_space_type(MetaspaceType space_type, bool is_class) { |
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163 |
|
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164 |
if (is_class) { |
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switch(space_type) { |
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166 |
case StandardMetaspaceType: return &g_chunk_alloc_sequence_standard_class; |
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167 |
case ReflectionMetaspaceType: |
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168 |
case UnsafeAnonymousMetaspaceType: return &g_chunk_alloc_sequence_anon_class; |
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169 |
case BootMetaspaceType: return &g_chunk_alloc_sequence_boot_non_class; |
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170 |
default: ShouldNotReachHere(); |
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171 |
} |
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|
172 |
} else { |
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|
173 |
switch(space_type) { |
58716
960e372a6065
Fix error in chunk allocation strategy which caused small chunks to dominate
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|
174 |
case StandardMetaspaceType: return &g_chunk_alloc_sequence_standard_non_class; |
58063
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175 |
case ReflectionMetaspaceType: |
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Fix error in chunk allocation strategy which caused small chunks to dominate
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|
176 |
case UnsafeAnonymousMetaspaceType: return &g_chunk_alloc_sequence_anon_non_class; |
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|
177 |
case BootMetaspaceType: return &g_chunk_alloc_sequence_boot_non_class; |
58063
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|
178 |
default: ShouldNotReachHere(); |
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|
179 |
} |
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|
180 |
} |
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|
181 |
|
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182 |
return NULL; |
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|
183 |
|
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|
184 |
} |
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|
185 |
|
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|
186 |
|
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|
187 |
|
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|
188 |
} // namespace metaspace |
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189 |