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_COMMITLIMITER_HPP 26 #define SHARE_MEMORY_METASPACE_COMMITLIMITER_HPP 27 28 #include "memory/allocation.hpp" 29 #include "memory/metaspace/counter.hpp" 30 31 namespace metaspace { 32 33 class CommitLimiter : public CHeapObj<mtInternal> { 34 35 // Counts total words committed for metaspace 36 SizeCounter _cnt; 37 38 // Purely for testing purposes. 39 const size_t _cap; 40 41 public: 42 43 CommitLimiter(size_t cap = 0) : _cnt(), _cap(cap) {} 44 45 // Returns the size, in words, by which we may expand the metaspace committed area without: 46 // - _cap == 0: hitting GC threshold or the MaxMetaspaceSize 47 // - _cap > 0: hitting cap (this is just for testing purposes) 48 size_t possible_expansion_words() const; 49 50 void increase_committed(size_t word_size) { _cnt.increment_by(word_size); } 51 void decrease_committed(size_t word_size) { _cnt.decrement_by(word_size); } 52 size_t committed_words() const { return _cnt.get(); } 53 54 // Returns the global metaspace commit counter 55 static CommitLimiter* globalLimiter(); 56 57 }; 58 59 } // namespace metaspace 60 61 #endif // SHARE_MEMORY_METASPACE_COMMITLIMITER_HPP