author | stuefe |
Tue, 26 Nov 2019 16:21:29 +0100 | |
branch | stuefe-new-metaspace-branch |
changeset 59272 | 54750b448264 |
parent 58063 | bdf136b8ae0e |
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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|
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#ifndef SHARE_MEMORY_METASPACE_CHUNKLEVEL_HPP |
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#define SHARE_MEMORY_METASPACE_CHUNKLEVEL_HPP |
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|
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#include "utilities/globalDefinitions.hpp" |
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|
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// Constants for the chunk levels and some utility functions. |
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|
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class outputStream; |
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|
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namespace metaspace { |
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// Metachunk level (must be signed) |
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typedef signed char chklvl_t; |
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|
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#define CHKLVL_FORMAT "lv%.2d" |
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|
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// Chunks are managed by a binary buddy allocator. |
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|
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// Chunk sizes range from 1K to 4MB (64bit). |
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// |
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// Reasoning: .... TODO explain |
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|
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// Each chunk has a level; the level corresponds to its position in the tree |
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// and describes its size. |
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// |
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// The largest chunks are called root chunks, of 4MB in size, and have level 0. |
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// From there on it goes: |
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// |
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// size level |
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// 4MB 0 |
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// 2MB 1 |
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// 1MB 2 |
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// 512K 3 |
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// 256K 4 |
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// 128K 5 |
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// 64K 6 |
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// 32K 7 |
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// 16K 8 |
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// 8K 9 |
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// 4K 10 |
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// 2K 11 |
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// 1K 12 |
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|
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namespace chklvl { |
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static const size_t MAX_CHUNK_BYTE_SIZE = 4 * M; |
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static const int NUM_CHUNK_LEVELS = 13; |
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static const size_t MIN_CHUNK_BYTE_SIZE = (MAX_CHUNK_BYTE_SIZE >> (size_t)NUM_CHUNK_LEVELS); |
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static const size_t MIN_CHUNK_WORD_SIZE = MIN_CHUNK_BYTE_SIZE / sizeof(MetaWord); |
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static const size_t MAX_CHUNK_WORD_SIZE = MAX_CHUNK_BYTE_SIZE / sizeof(MetaWord); |
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static const chklvl_t ROOT_CHUNK_LEVEL = 0; |
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static const chklvl_t HIGHEST_CHUNK_LEVEL = NUM_CHUNK_LEVELS - 1; |
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static const chklvl_t LOWEST_CHUNK_LEVEL = 0; |
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static const chklvl_t INVALID_CHUNK_LEVEL = (chklvl_t) -1; |
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inline bool is_valid_level(chklvl_t level) { |
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return level >= LOWEST_CHUNK_LEVEL && |
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level <= HIGHEST_CHUNK_LEVEL; |
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} |
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inline void check_valid_level(chklvl_t lvl) { |
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assert(is_valid_level(lvl), "invalid level (%d)", (int)lvl); |
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} |
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// Given a level return the chunk size, in words. |
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inline size_t word_size_for_level(chklvl_t level) { |
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check_valid_level(level); |
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return (MAX_CHUNK_BYTE_SIZE >> level) / BytesPerWord; |
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} |
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// Given an arbitrary word size smaller than the highest chunk size, |
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// return the highest chunk level able to hold this size. |
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// Returns INVALID_CHUNK_LEVEL if no fitting level can be found. |
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chklvl_t level_fitting_word_size(size_t word_size); |
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// Shorthands to refer to exact sizes |
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static const chklvl_t CHUNK_LEVEL_4M = ROOT_CHUNK_LEVEL; |
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static const chklvl_t CHUNK_LEVEL_2M = (ROOT_CHUNK_LEVEL + 1); |
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static const chklvl_t CHUNK_LEVEL_1M = (ROOT_CHUNK_LEVEL + 2); |
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static const chklvl_t CHUNK_LEVEL_512K = (ROOT_CHUNK_LEVEL + 3); |
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static const chklvl_t CHUNK_LEVEL_256K = (ROOT_CHUNK_LEVEL + 4); |
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static const chklvl_t CHUNK_LEVEL_128K = (ROOT_CHUNK_LEVEL + 5); |
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static const chklvl_t CHUNK_LEVEL_64K = (ROOT_CHUNK_LEVEL + 6); |
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static const chklvl_t CHUNK_LEVEL_32K = (ROOT_CHUNK_LEVEL + 7); |
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static const chklvl_t CHUNK_LEVEL_16K = (ROOT_CHUNK_LEVEL + 8); |
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static const chklvl_t CHUNK_LEVEL_8K = (ROOT_CHUNK_LEVEL + 9); |
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static const chklvl_t CHUNK_LEVEL_4K = (ROOT_CHUNK_LEVEL + 10); |
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static const chklvl_t CHUNK_LEVEL_2K = (ROOT_CHUNK_LEVEL + 11); |
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static const chklvl_t CHUNK_LEVEL_1K = (ROOT_CHUNK_LEVEL + 12); |
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STATIC_ASSERT(CHUNK_LEVEL_1K == HIGHEST_CHUNK_LEVEL); |
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///////////////////////////////////////////////////////// |
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// print helpers |
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void print_chunk_size(outputStream* st, chklvl_t lvl); |
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} // namespace chklvl |
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Initial changes for new metaspace. Only tested for Linux x64.
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} // namespace metaspace |
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Initial changes for new metaspace. Only tested for Linux x64.
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Initial changes for new metaspace. Only tested for Linux x64.
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#endif // SHARE_MEMORY_METASPACE_BLOCKFREELIST_HPP |