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annotate src/share/vm/runtime/statSampler.hpp @ 18096:ca6d25be853b jdk8u25-b13
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| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_STATSAMPLER_HPP |
| 26 #define SHARE_VM_RUNTIME_STATSAMPLER_HPP | |
| 27 | |
| 28 #include "runtime/perfData.hpp" | |
| 29 #include "runtime/task.hpp" | |
| 30 | |
| 0 | 31 class StatSamplerTask; |
| 32 | |
| 33 /* | |
| 34 * The StatSampler class is responsible for periodically updating | |
| 35 * sampled PerfData instances and writing the sampled values to the | |
| 36 * PerfData memory region. | |
| 37 * | |
| 38 * In addition it is also responsible for providing a home for | |
| 39 * PerfData instances that otherwise have no better home. | |
| 40 */ | |
| 41 class StatSampler : AllStatic { | |
| 42 | |
| 43 friend class StatSamplerTask; | |
| 44 | |
| 45 private: | |
| 46 | |
| 47 static StatSamplerTask* _task; | |
| 48 static PerfDataList* _sampled; | |
| 49 | |
| 50 static void collect_sample(); | |
| 51 static void create_misc_perfdata(); | |
| 52 static void create_sampled_perfdata(); | |
| 53 static void sample_data(PerfDataList* list); | |
| 54 static const char* get_system_property(const char* name, TRAPS); | |
| 55 static void create_system_property_instrumentation(TRAPS); | |
| 56 | |
| 57 public: | |
| 58 // Start/stop the sampler | |
| 59 static void engage(); | |
| 60 static void disengage(); | |
| 61 | |
| 62 static bool is_active() { return _task != NULL; } | |
| 63 | |
| 64 static void initialize(); | |
| 65 static void destroy(); | |
| 66 }; | |
| 67 | |
| 68 void statSampler_exit(); | |
| 1972 | 69 |
| 70 #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP |