src/hotspot/share/runtime/statSampler.hpp
author ccheung
Tue, 10 Oct 2017 14:38:56 -0700
changeset 47614 0ecfd6c951a6
parent 47216 71c04702a3d5
child 53244 9807daeb47c4
permissions -rw-r--r--
8185694: Replace SystemDictionaryShared::_java_platform_loader with SystemDictionary::is_platform_class_loader() Summary: added the creation of _java_platform_loader Reviewed-by: iklam, coleenp, mchung, dholmes, jiangli
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/*
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 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_STATSAMPLER_HPP
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#define SHARE_VM_RUNTIME_STATSAMPLER_HPP
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#include "runtime/perfData.hpp"
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#include "runtime/task.hpp"
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class StatSamplerTask;
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/*
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 * The StatSampler class is responsible for periodically updating
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 * sampled PerfData instances and writing the sampled values to the
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 * PerfData memory region.
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 *
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 * In addition it is also responsible for providing a home for
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 * PerfData instances that otherwise have no better home.
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 */
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class StatSampler : AllStatic {
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  friend class StatSamplerTask;
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  private:
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    static StatSamplerTask* _task;
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    static PerfDataList* _sampled;
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    static void collect_sample();
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    static void create_misc_perfdata();
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    static void create_sampled_perfdata();
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    static void sample_data(PerfDataList* list);
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    static const char* get_system_property(const char* name, TRAPS);
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    static void create_system_property_instrumentation(TRAPS);
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  public:
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    // Start/stop the sampler
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    static void engage();
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    static void disengage();
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    static bool is_active() { return _task != NULL; }
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    static void initialize();
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    static void destroy();
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};
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void statSampler_exit();
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#endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP