1 /* 2 * Copyright (c) 2002, 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_CMS_GSPACECOUNTERS_HPP 26 #define SHARE_VM_GC_CMS_GSPACECOUNTERS_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 GSpaceCounter is a holder class for performance counters 34 // that track a space; 35 36 class GSpaceCounters: public CHeapObj<mtGC> { 37 friend class VMStructs; 38 39 private: 40 PerfVariable* _capacity; 41 PerfVariable* _used; 42 43 // Constant PerfData types don't need to retain a reference. 44 // However, it's a good idea to document them here. 45 // PerfConstant* _size; 46 47 Generation* _gen; 48 char* _name_space; 49 50 public: 51 52 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, 53 GenerationCounters* gc, bool sampled=true); 54 55 ~GSpaceCounters() { 56 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); 57 } 58 59 inline void update_capacity() { 60 _capacity->set_value(_gen->capacity()); 61 } 62 63 inline void update_used() { 64 _used->set_value(_gen->used()); 65 } 66 67 // special version of update_used() to allow the used value to be 68 // passed as a parameter. This method can can be used in cases were 69 // the utilization is already known and/or when the _gen->used() 70 // method is known to be expensive and we want to avoid unnecessary 71 // calls to it. 72 // 73 inline void update_used(size_t used) { 74 _used->set_value(used); 75 } 76 77 inline void inc_used(size_t size) { 78 _used->inc(size); 79 } 80 81 debug_only( 82 // for security reasons, we do not allow arbitrary reads from 83 // the counters as they may live in shared memory. 84 jlong used() { 85 return _used->get_value(); 86 } 87 jlong capacity() { 88 return _used->get_value(); 89 } 90 ) 91 92 inline void update_all() { 93 update_used(); 94 update_capacity(); 95 } 96 97 const char* name_space() const { return _name_space; } 98 }; 99 100 class GenerationUsedHelper : public PerfLongSampleHelper { 101 private: 102 Generation* _gen; 103 104 public: 105 GenerationUsedHelper(Generation* g) : _gen(g) { } 106 107 inline jlong take_sample() { 108 return _gen->used(); 109 } 110 }; 111 112 #endif // SHARE_VM_GC_CMS_GSPACECOUNTERS_HPP