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 28 #include "memory/metaspace/commitLimiter.hpp" 29 #include "memory/metaspace.hpp" 30 #include "utilities/debug.hpp" 31 #include "utilities/globalDefinitions.hpp" 32 33 namespace metaspace { 34 35 // Returns the size, in words, by which we may expand the metaspace committed area without: 36 // - _cap == 0: hitting GC threshold or the MaxMetaspaceSize 37 // - _cap > 0: hitting cap (this is just for testing purposes) 38 size_t CommitLimiter::possible_expansion_words() const { 39 40 if (_cap > 0) { // Testing. 41 assert(_cnt.get() <= _cap, "Beyond limit?"); 42 return _cap - _cnt.get(); 43 } 44 45 assert(_cnt.get() * BytesPerWord <= MaxMetaspaceSize, "Beyond limit?"); 46 const size_t words_left_below_max = MaxMetaspaceSize / BytesPerWord - _cnt.get(); 47 48 const size_t words_left_below_gc_threshold = MetaspaceGC::allowed_expansion(); 49 50 return MIN2(words_left_below_max, words_left_below_gc_threshold); 51 52 } 53 54 static CommitLimiter g_global_limiter(0); 55 56 // Returns the global metaspace commit counter 57 CommitLimiter* CommitLimiter::globalLimiter() { 58 return &g_global_limiter; 59 } 60 61 } // namespace metaspace 62