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1 /* |
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2 * Copyright (c) 2001, 2010, 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_RUNTIME_STATSAMPLER_HPP |
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26 #define SHARE_VM_RUNTIME_STATSAMPLER_HPP |
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27 |
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28 #include "runtime/perfData.hpp" |
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29 #include "runtime/task.hpp" |
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30 |
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31 class StatSamplerTask; |
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32 |
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33 /* |
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34 * The StatSampler class is responsible for periodically updating |
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35 * sampled PerfData instances and writing the sampled values to the |
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36 * PerfData memory region. |
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37 * |
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38 * In addition it is also responsible for providing a home for |
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39 * PerfData instances that otherwise have no better home. |
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40 */ |
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41 class StatSampler : AllStatic { |
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42 |
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43 friend class StatSamplerTask; |
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44 |
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45 private: |
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46 |
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47 static StatSamplerTask* _task; |
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48 static PerfDataList* _sampled; |
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49 |
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50 static void collect_sample(); |
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51 static void create_misc_perfdata(); |
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52 static void create_sampled_perfdata(); |
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53 static void sample_data(PerfDataList* list); |
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54 static const char* get_system_property(const char* name, TRAPS); |
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55 static void create_system_property_instrumentation(TRAPS); |
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56 |
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57 public: |
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58 // Start/stop the sampler |
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59 static void engage(); |
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60 static void disengage(); |
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61 |
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62 static bool is_active() { return _task != NULL; } |
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63 |
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64 static void initialize(); |
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65 static void destroy(); |
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66 }; |
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67 |
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68 void statSampler_exit(); |
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69 |
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70 #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP |