1 /* 2 * Copyright (c) 2002, 2019, 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_GC_CMS_GSPACECOUNTERS_HPP 26 #define SHARE_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 57 inline void update_capacity() { 58 _capacity->set_value(_gen->capacity()); 59 } 60 61 inline void update_used() { 62 _used->set_value(_gen->used()); 63 } 64 65 // special version of update_used() to allow the used value to be 66 // passed as a parameter. This method can can be used in cases were 67 // the utilization is already known and/or when the _gen->used() 68 // method is known to be expensive and we want to avoid unnecessary 69 // calls to it. 70 // 71 inline void update_used(size_t used) { 72 _used->set_value(used); 73 } 74 75 inline void inc_used(size_t size) { 76 _used->inc(size); 77 } 78 79 debug_only( 80 // for security reasons, we do not allow arbitrary reads from 81 // the counters as they may live in shared memory. 82 jlong used() { 83 return _used->get_value(); 84 } 85 jlong capacity() { 86 return _used->get_value(); 87 } 88 ) 89 90 inline void update_all() { 91 update_used(); 92 update_capacity(); 93 } 94 95 const char* name_space() const { return _name_space; } 96 }; 97 98 class GenerationUsedHelper : public PerfLongSampleHelper { 99 private: 100 Generation* _gen; 101 102 public: 103 GenerationUsedHelper(Generation* g) : _gen(g) { } 104 105 inline jlong take_sample() { 106 return _gen->used(); 107 } 108 }; 109 110 #endif // SHARE_GC_CMS_GSPACECOUNTERS_HPP