1 /* 2 * Copyright (c) 2002, 2004, 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 // A GSpaceCounter is a holder class for performance counters 26 // that track a space; 27 28 class GSpaceCounters: public CHeapObj { 29 friend class VMStructs; 30 31 private: 32 PerfVariable* _capacity; 33 PerfVariable* _used; 34 35 // Constant PerfData types don't need to retain a reference. 36 // However, it's a good idea to document them here. 37 // PerfConstant* _size; 38 39 Generation* _gen; 40 char* _name_space; 41 42 public: 43 44 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, 45 GenerationCounters* gc, bool sampled=true); 46 47 ~GSpaceCounters() { 48 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space); 49 } 50 51 inline void update_capacity() { 52 _capacity->set_value(_gen->capacity()); 53 } 54 55 inline void update_used() { 56 _used->set_value(_gen->used()); 57 } 58 59 // special version of update_used() to allow the used value to be 60 // passed as a parameter. This method can can be used in cases were 61 // the utilization is already known and/or when the _gen->used() 62 // method is known to be expensive and we want to avoid unnecessary 63 // calls to it. 64 // 65 inline void update_used(size_t used) { 66 _used->set_value(used); 67 } 68 69 inline void inc_used(size_t size) { 70 _used->inc(size); 71 } 72 73 debug_only( 74 // for security reasons, we do not allow arbitrary reads from 75 // the counters as they may live in shared memory. 76 jlong used() { 77 return _used->get_value(); 78 } 79 jlong capacity() { 80 return _used->get_value(); 81 } 82 ) 83 84 inline void update_all() { 85 update_used(); 86 update_capacity(); 87 } 88 89 const char* name_space() const { return _name_space; } 90 }; 91 92 class GenerationUsedHelper : public PerfLongSampleHelper { 93 private: 94 Generation* _gen; 95 96 public: 97 GenerationUsedHelper(Generation* g) : _gen(g) { } 98 99 inline jlong take_sample() { 100 return _gen->used(); 101 } 102 };