jdk8-mips64-public/hotspot: src/share/vm/runtime/statSampler.hpp@eef07cd490d4

     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  */

    25 #ifndef SHARE_VM_RUNTIME_STATSAMPLER_HPP

    26 #define SHARE_VM_RUNTIME_STATSAMPLER_HPP

    28 #include "runtime/perfData.hpp"

    29 #include "runtime/task.hpp"

    31 class StatSamplerTask;

    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 {

    43   friend class StatSamplerTask;

    45   private:

    47     static StatSamplerTask* _task;

    48     static PerfDataList* _sampled;

    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);

    57   public:

    58     // Start/stop the sampler

    59     static void engage();

    60     static void disengage();

    62     static bool is_active() { return _task != NULL; }

    64     static void initialize();

    65     static void destroy();

    66 };

    68 void statSampler_exit();

    70 #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP

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