1 /* 2 * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_MEMORY_METASPACE_CONSTANTS_HPP 26 #define SHARE_MEMORY_METASPACE_CONSTANTS_HPP 27 28 #include "utilities/globalDefinitions.hpp" 29 #include "memory/metaspace/chunkLevel.hpp" 30 31 namespace metaspace { 32 33 // Constants to be used throughout metaspace 34 35 namespace constants { 36 37 // Granularity, in bytes, metaspace is committed with. 38 static const size_t commit_granule_bytes = K * 64; 39 static const size_t commit_granule_words = commit_granule_bytes * BytesPerWord; 40 41 42 // Whether or not commit new-born chunks thru after creation. 43 static const bool newborn_chunks_are_fully_committed = true; 44 45 // When a chunk is handed out by the ChunkManager to a class loader, how much 46 // of a chunk should be committed up-front? 47 // Size in words. Must be a multiple of commit_granule_words. 48 // (Note: 0 is possible but inefficient, since it will cause the ClassLoaderMetaspace 49 // to commit the first granule right away anyway, so nothing is saved. 50 // chklvl::MAX_CHUNK_WORD_SIZE pretty much means every chunk is committed thru 51 // from the start. 52 static const size_t committed_words_on_fresh_chunks = commit_granule_bytes * 2; 53 54 // The default size of a non-class VirtualSpaceNode (unless created differently). 55 // Must be a multiple of the root chunk size. 56 static const size_t virtual_space_node_default_size = chklvl::MAX_CHUNK_BYTE_SIZE * 4; 57 58 static const size_t allocation_from_dictionary_limit = 4 * K; 59 60 } // namespace constants 61 62 } // namespace metaspace 63 64 #endif // SHARE_MEMORY_METASPACE_BLOCKFREELIST_HPP