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3289
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_HSPACECOUNTERS_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_HSPACECOUNTERS_HPP
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27
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28 #ifndef SERIALGC
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29 #include "gc_implementation/shared/generationCounters.hpp"
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30 #include "memory/generation.hpp"
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31 #include "runtime/perfData.hpp"
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32 #endif
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33
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34 // A HSpaceCounter is a holder class for performance counters
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35 // that track a collections (logical spaces) in a heap;
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36
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37 class HeapSpaceUsedHelper;
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38 class G1SpaceMonitoringSupport;
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39
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40 class HSpaceCounters: public CHeapObj {
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41 friend class VMStructs;
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42
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43 private:
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44 PerfVariable* _capacity;
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45 PerfVariable* _used;
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46
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47 // Constant PerfData types don't need to retain a reference.
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48 // However, it's a good idea to document them here.
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49
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50 char* _name_space;
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51
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52 public:
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53
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54 HSpaceCounters(const char* name, int ordinal, size_t max_size,
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55 size_t initial_capacity, GenerationCounters* gc);
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56
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57 ~HSpaceCounters() {
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58 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
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59 }
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60
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61 inline void update_capacity(size_t v) {
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62 _capacity->set_value(v);
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63 }
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64
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65 inline void update_used(size_t v) {
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66 _used->set_value(v);
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67 }
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68
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69 debug_only(
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70 // for security reasons, we do not allow arbitrary reads from
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71 // the counters as they may live in shared memory.
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72 jlong used() {
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73 return _used->get_value();
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74 }
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75 jlong capacity() {
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76 return _used->get_value();
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77 }
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78 )
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79
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80 inline void update_all(size_t capacity, size_t used) {
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81 update_capacity(capacity);
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82 update_used(used);
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83 }
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84
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85 const char* name_space() const { return _name_space; }
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86 };
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87 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_HSPACECOUNTERS_HPP
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