| /* |
| * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_RUNTIME_STATSAMPLER_HPP |
| #define SHARE_VM_RUNTIME_STATSAMPLER_HPP |
| |
| #include "runtime/perfData.hpp" |
| #include "runtime/task.hpp" |
| |
| class StatSamplerTask; |
| |
| /* |
| * The StatSampler class is responsible for periodically updating |
| * sampled PerfData instances and writing the sampled values to the |
| * PerfData memory region. |
| * |
| * In addition it is also responsible for providing a home for |
| * PerfData instances that otherwise have no better home. |
| */ |
| class StatSampler : AllStatic { |
| |
| friend class StatSamplerTask; |
| |
| private: |
| |
| static StatSamplerTask* _task; |
| static PerfDataList* _sampled; |
| |
| static void collect_sample(); |
| static void create_misc_perfdata(); |
| static void create_sampled_perfdata(); |
| static void sample_data(PerfDataList* list); |
| static const char* get_system_property(const char* name, TRAPS); |
| static void create_system_property_instrumentation(TRAPS); |
| |
| public: |
| // Start/stop the sampler |
| static void engage(); |
| static void disengage(); |
| |
| static bool is_active() { return _task != NULL; } |
| |
| static void initialize(); |
| static void destroy(); |
| }; |
| |
| void statSampler_exit(); |
| |
| #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP |