1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2020 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "memory/metaspace/freeBlocks.hpp" 28 #include "utilities/globalDefinitions.hpp" 29 #include "utilities/debug.hpp" 30 31 namespace metaspace { 32 33 void FreeBlocks::add_block(MetaWord* p, size_t word_size) { 34 assert(word_size >= minimal_word_size, "sanity (" SIZE_FORMAT ")", word_size); 35 if (word_size >= _small_blocks.maximal_word_size) { 36 _tree.add_block(p, word_size); 37 } else { 38 _small_blocks.add_block(p, word_size); 39 } 40 } 41 42 MetaWord* FreeBlocks::get_block(size_t requested_word_size) { 43 assert(requested_word_size >= minimal_word_size, 44 "requested_word_size too small (" SIZE_FORMAT ")", requested_word_size); 45 size_t real_size = 0; 46 MetaWord* p = NULL; 47 if (requested_word_size >= _small_blocks.maximal_word_size) { 48 p = _tree.get_block(requested_word_size, &real_size); 49 } else { 50 p = _small_blocks.get_block(requested_word_size, &real_size); 51 } 52 if (p != NULL) { 53 // Blocks which are larger than a certain threshold are split and 54 // the remainder is handed back to the manager. 55 const size_t waste = real_size - requested_word_size; 56 if (waste > MAX2(minimal_word_size, splinter_threshold)) { 57 add_block(p + requested_word_size, waste); 58 } 59 } 60 return p; 61 } 62 63 } // namespace metaspace 64