1 /* 2 * Copyright (c) 2002, 2010, 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_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP 27 28 #ifndef SERIALGC 29 #include "gc_implementation/shared/generationCounters.hpp" 30 #include "memory/generation.hpp" 31 #include "runtime/perfData.hpp" 32 #endif 33 34 // A GSpaceCounter is a holder class for performance counters 35 // that track a space; 36 37 class GSpaceCounters: public CHeapObj { 38 friend class VMStructs; 39 40 private: 41 PerfVariable* _capacity; 42 PerfVariable* _used; 43 44 // Constant PerfData types don't need to retain a reference. 45 // However, it's a good idea to document them here. 46 // PerfConstant* _size; 47 48 Generation* _gen; 49 char* _name_space; 50 51 public: 52 53 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, 54 GenerationCounters* gc, bool sampled=true); 55 56 ~GSpaceCounters() { 57 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); 58 } 59 60 inline void update_capacity() { 61 _capacity->set_value(_gen->capacity()); 62 } 63 64 inline void update_used() { 65 _used->set_value(_gen->used()); 66 } 67 68 // special version of update_used() to allow the used value to be 69 // passed as a parameter. This method can can be used in cases were 70 // the utilization is already known and/or when the _gen->used() 71 // method is known to be expensive and we want to avoid unnecessary 72 // calls to it. 73 // 74 inline void update_used(size_t used) { 75 _used->set_value(used); 76 } 77 78 inline void inc_used(size_t size) { 79 _used->inc(size); 80 } 81 82 debug_only( 83 // for security reasons, we do not allow arbitrary reads from 84 // the counters as they may live in shared memory. 85 jlong used() { 86 return _used->get_value(); 87 } 88 jlong capacity() { 89 return _used->get_value(); 90 } 91 ) 92 93 inline void update_all() { 94 update_used(); 95 update_capacity(); 96 } 97 98 const char* name_space() const { return _name_space; } 99 }; 100 101 class GenerationUsedHelper : public PerfLongSampleHelper { 102 private: 103 Generation* _gen; 104 105 public: 106 GenerationUsedHelper(Generation* g) : _gen(g) { } 107 108 inline jlong take_sample() { 109 return _gen->used(); 110 } 111 }; 112 113 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP