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/chunkHeaderPool.hpp" 28 #include "runtime/os.hpp" 29 #include "utilities/debug.hpp" 30 #include "utilities/globalDefinitions.hpp" 31 32 namespace metaspace { 33 34 35 // Returns reference to the one global chunk header pool. 36 ChunkHeaderPool* ChunkHeaderPool::_chunkHeaderPool = NULL; 37 38 39 ChunkHeaderPool::ChunkHeaderPool() 40 : _num_slabs(), _first_slab(NULL), _current_slab(NULL) 41 { 42 } 43 44 // Note: the global chunk header pool gets never deleted; so this destructor only 45 // exists for the sake of tests. 46 ChunkHeaderPool::~ChunkHeaderPool() { 47 slab_t* s = _first_slab; 48 while (s != NULL) { 49 slab_t* next_slab = s->next; 50 os::free(s); 51 s = next_slab; 52 } 53 } 54 55 void ChunkHeaderPool::allocate_new_slab() { 56 slab_t* slab = new slab_t(); 57 if (_current_slab != NULL) { 58 _current_slab->next = slab; 59 } 60 _current_slab = slab; 61 if (_first_slab == NULL) { 62 _first_slab = slab; 63 } 64 _num_slabs.increment(); 65 } 66 67 // Returns size of memory used. 68 size_t ChunkHeaderPool::memory_footprint_words() const { 69 return (_num_slabs.get() * sizeof(slab_t)) / BytesPerWord; 70 } 71 72 void ChunkHeaderPool::initialize() { 73 assert(_chunkHeaderPool == NULL, "only once"); 74 _chunkHeaderPool = new ChunkHeaderPool(); 75 } 76 77 #ifdef ASSERT 78 void ChunkHeaderPool::verify(bool slow) const { 79 const slab_t* s = _first_slab; 80 int num = 0; 81 while (s != NULL) { 82 assert(s->top >= 0 && s->top <= slab_capacity, 83 "invalid slab at " PTR_FORMAT ", top: %d, slab cap: %d", 84 p2i(s), s->top, slab_capacity ); 85 s = s->next; 86 num ++; 87 } 88 _num_slabs.check(num); 89 } 90 #endif 91 92 } // namespace metaspace 93 94