1 /* 2 * Copyright (c) 2018, 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 #include "precompiled.hpp" 26 27 #include "memory/metaspace/commitLimiter.hpp" 28 #include "memory/metaspace.hpp" 29 #include "utilities/debug.hpp" 30 #include "utilities/globalDefinitions.hpp" 31 32 namespace metaspace { 33 34 // Returns the size, in words, by which we may expand the metaspace committed area without: 35 // - _cap == 0: hitting GC threshold or the MaxMetaspaceSize 36 // - _cap > 0: hitting cap (this is just for testing purposes) 37 size_t CommitLimiter::possible_expansion_words() const { 38 39 if (_cap > 0) { // Testing. 40 assert(_cnt.get() <= _cap, "Beyond limit?"); 41 return _cap - _cnt.get(); 42 } 43 44 assert(_cnt.get() * BytesPerWord <= MaxMetaspaceSize, "Beyond limit?"); 45 const size_t words_left_below_max = MaxMetaspaceSize / BytesPerWord - _cnt.get(); 46 47 const size_t words_left_below_gc_threshold = MetaspaceGC::allowed_expansion(); 48 49 return MIN2(words_left_below_max, words_left_below_gc_threshold); 50 51 } 52 53 static CommitLimiter g_global_limiter(0); 54 55 // Returns the global metaspace commit counter 56 CommitLimiter* CommitLimiter::globalLimiter() { 57 return &g_global_limiter; 58 } 59 60 } // namespace metaspace 61