author | stuefe |
Tue, 26 Nov 2019 11:29:20 +0100 | |
branch | stuefe-new-metaspace-branch |
changeset 59271 | 1558266946de |
parent 59257 | 990b1fed3b47 |
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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#ifndef SHARE_MEMORY_METASPACE_BLOCKLISTARRAY_HPP |
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#define SHARE_MEMORY_METASPACE_BLOCKLISTARRAY_HPP |
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#include "memory/allocation.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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class outputStream; |
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namespace metaspace { |
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struct block_t { |
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block_t* next; |
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size_t size; |
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}; |
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struct block_stats_t { |
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size_t word_size; |
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int num_blocks; |
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}; |
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// A bitmap keeping track of which list is occupied. Smallest list corresponds to lowest order bit. |
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// 1 means list is not empty, 0 means list is empty. |
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class BlockListArrayMask { |
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typedef uint32_t mask_type; |
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mask_type _mask; |
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static mask_type mask_for_pos(int pos) { return 1 << pos; } |
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public: |
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BlockListArrayMask() : _mask(0) {} |
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bool all_zero() const { return _mask == 0; } |
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bool get_bit(int pos) const { return (_mask & mask_for_pos(pos)) != 0 ? true : false; } |
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void set_bit(int pos) { _mask |= mask_for_pos(pos); } |
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void clr_bit(int pos) { _mask &= ~mask_for_pos(pos); } |
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// Starting at the position following pos, find the 1 bit. |
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// Return its position, or -1 if not found. |
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inline int find_next_set_bit(int pos) const; |
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static int size() { return sizeof(mask_type) * 8; } |
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}; |
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template < |
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size_t min_word_size, |
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size_t spread, |
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int num_bins |
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> |
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class BlockListArray { |
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STATIC_ASSERT(sizeof(block_t) <= (min_word_size * BytesPerWord)); |
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block_t* _bins[num_bins]; |
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BlockListArrayMask _map; |
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// e.g. spread = 4 |
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// |
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// sz bno (put) bno (get) |
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// (guarant) |
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// 0 00 00 |
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// 1 00 01 |
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// 2 00 01 |
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// 3 00 01 |
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// 4 01 01 |
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// 5 01 02 |
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// 6 01 02 |
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// 7 01 02 |
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// 8 02 02 |
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// 9 02 03 |
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// 10 02 03 |
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// 11 02 03 |
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// |
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// put -> no = wordsize / spread |
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// |
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// get -> no = (req_wordsize + spread - 1) / spread |
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// The bin number for a given word size. |
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static int bin_for_size(size_t word_size) { |
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assert(word_size >= min_word_size && word_size < maximal_word_size(), |
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"Word size oob (" SIZE_FORMAT ")", word_size); |
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return (word_size - min_word_size) / spread; |
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} |
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// [minimal, maximal) size of blocks which are held in a bin. |
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// Note that when taking a block out of the bin, only the minimum block size |
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// is guaranteed. |
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static size_t minimal_word_size_in_bin(int bno) { |
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return min_word_size + (bno * spread); |
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} |
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static size_t maximal_word_size_in_bin(int bno) { |
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return minimal_word_size_in_bin(bno) + spread; |
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} |
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public: |
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BlockListArray() : _map() { |
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assert(BlockListArrayMask::size() >= num_bins, "Map too small."); |
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::memset(_bins, 0, sizeof(_bins)); |
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} |
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// [min, max) word size |
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static size_t minimal_word_size() { return min_word_size; } |
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static size_t maximal_word_size() { return min_word_size + (spread * num_bins); } |
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inline void put(MetaWord* p, size_t word_size); |
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inline block_t* get(size_t word_size); |
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#ifdef ASSERT |
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void verify() const; |
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#endif |
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void statistics(block_stats_t* stats) const; |
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void print(outputStream* st) const; |
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// Returns true if the array contains no blocks. |
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bool is_empty() const { return _map.all_zero(); } |
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}; |
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} // namespace metaspace |
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#endif // SHARE_MEMORY_METASPACE_BLOCKLISTARRAY_HPP |