1 /* 2 * Copyright (c) 2001, 2010, 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 #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 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(); 69 70 #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP