1 /* 2 * Copyright (c) 2002, 2014, 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 #include "utilities/macros.hpp" 29 #if INCLUDE_ALL_GCS 30 #include "gc_implementation/shared/generationCounters.hpp" 31 #include "memory/generation.hpp" 32 #include "runtime/perfData.hpp" 33 #endif // INCLUDE_ALL_GCS 34 35 // A GSpaceCounter is a holder class for performance counters 36 // that track a space; 37 38 class GSpaceCounters: public CHeapObj<mtGC> { 39 friend class VMStructs; 40 41 private: 42 PerfVariable* _capacity; 43 PerfVariable* _used; 44 45 // Constant PerfData types don't need to retain a reference. 46 // However, it's a good idea to document them here. 47 // PerfConstant* _size; 48 49 Generation* _gen; 50 char* _name_space; 51 52 public: 53 54 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, 55 GenerationCounters* gc, bool sampled=true); 56 57 ~GSpaceCounters() { 58 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); 59 } 60 61 inline void update_capacity() { 62 _capacity->set_value(_gen->capacity()); 63 } 64 65 inline void update_used() { 66 _used->set_value(_gen->used()); 67 } 68 69 // special version of update_used() to allow the used value to be 70 // passed as a parameter. This method can can be used in cases were 71 // the utilization is already known and/or when the _gen->used() 72 // method is known to be expensive and we want to avoid unnecessary 73 // calls to it. 74 // 75 inline void update_used(size_t used) { 76 _used->set_value(used); 77 } 78 79 inline void inc_used(size_t size) { 80 _used->inc(size); 81 } 82 83 debug_only( 84 // for security reasons, we do not allow arbitrary reads from 85 // the counters as they may live in shared memory. 86 jlong used() { 87 return _used->get_value(); 88 } 89 jlong capacity() { 90 return _used->get_value(); 91 } 92 ) 93 94 inline void update_all() { 95 update_used(); 96 update_capacity(); 97 } 98 99 const char* name_space() const { return _name_space; } 100 }; 101 102 class GenerationUsedHelper : public PerfLongSampleHelper { 103 private: 104 Generation* _gen; 105 106 public: 107 GenerationUsedHelper(Generation* g) : _gen(g) { } 108 109 inline jlong take_sample() { 110 return _gen->used(); 111 } 112 }; 113 114 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP