1 /* 2 * Copyright (c) 2011, 2015, 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_VM_GC_SHARED_HSPACECOUNTERS_HPP 26 #define SHARE_VM_GC_SHARED_HSPACECOUNTERS_HPP 27 28 #include "gc/shared/generation.hpp" 29 #include "gc/shared/generationCounters.hpp" 30 #include "runtime/perfData.hpp" 31 #include "utilities/macros.hpp" 32 33 // A HSpaceCounter is a holder class for performance counters 34 // that track a collections (logical spaces) in a heap; 35 36 class HeapSpaceUsedHelper; 37 class G1SpaceMonitoringSupport; 38 39 class HSpaceCounters: public CHeapObj<mtGC> { 40 friend class VMStructs; 41 42 private: 43 PerfVariable* _capacity; 44 PerfVariable* _used; 45 46 // Constant PerfData types don't need to retain a reference. 47 // However, it's a good idea to document them here. 48 49 char* _name_space; 50 51 public: 52 53 HSpaceCounters(const char* name, int ordinal, size_t max_size, 54 size_t initial_capacity, GenerationCounters* gc); 55 56 ~HSpaceCounters() { 57 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); 58 } 59 60 inline void update_capacity(size_t v) { 61 _capacity->set_value(v); 62 } 63 64 inline void update_used(size_t v) { 65 _used->set_value(v); 66 } 67 68 debug_only( 69 // for security reasons, we do not allow arbitrary reads from 70 // the counters as they may live in shared memory. 71 jlong used() { 72 return _used->get_value(); 73 } 74 jlong capacity() { 75 return _used->get_value(); 76 } 77 ) 78 79 inline void update_all(size_t capacity, size_t used) { 80 update_capacity(capacity); 81 update_used(used); 82 } 83 84 const char* name_space() const { return _name_space; } 85 }; 86 #endif // SHARE_VM_GC_SHARED_HSPACECOUNTERS_HPP