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1 /*
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2 * Copyright 2002-2004 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A GSpaceCounter is a holder class for performance counters
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26 // that track a space;
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27
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28 class GSpaceCounters: public CHeapObj {
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29 friend class VMStructs;
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30
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31 private:
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32 PerfVariable* _capacity;
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33 PerfVariable* _used;
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34
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35 // Constant PerfData types don't need to retain a reference.
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36 // However, it's a good idea to document them here.
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37 // PerfConstant* _size;
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38
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39 Generation* _gen;
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40 char* _name_space;
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41
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42 public:
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43
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44 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g,
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45 GenerationCounters* gc, bool sampled=true);
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46
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47 ~GSpaceCounters() {
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48 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
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49 }
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50
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51 inline void update_capacity() {
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52 _capacity->set_value(_gen->capacity());
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53 }
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54
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55 inline void update_used() {
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56 _used->set_value(_gen->used());
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57 }
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58
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59 // special version of update_used() to allow the used value to be
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60 // passed as a parameter. This method can can be used in cases were
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61 // the utilization is already known and/or when the _gen->used()
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62 // method is known to be expensive and we want to avoid unnecessary
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63 // calls to it.
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64 //
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65 inline void update_used(size_t used) {
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66 _used->set_value(used);
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67 }
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68
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69 inline void inc_used(size_t size) {
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70 _used->inc(size);
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71 }
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72
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73 debug_only(
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74 // for security reasons, we do not allow arbitrary reads from
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75 // the counters as they may live in shared memory.
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76 jlong used() {
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77 return _used->get_value();
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78 }
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79 jlong capacity() {
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80 return _used->get_value();
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81 }
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82 )
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83
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84 inline void update_all() {
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85 update_used();
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86 update_capacity();
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87 }
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88
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89 const char* name_space() const { return _name_space; }
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90 };
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91
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92 class GenerationUsedHelper : public PerfLongSampleHelper {
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93 private:
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94 Generation* _gen;
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95
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96 public:
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97 GenerationUsedHelper(Generation* g) : _gen(g) { }
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98
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99 inline jlong take_sample() {
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100 return _gen->used();
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101 }
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102 };
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