jdk8-mips64-public/hotspot: src/share/vm/jfr/leakprofiler/sampling/objectSampler.hpp@8e875c964f41

8214542: JFR: Old Object Sample event slow on a deep heap in debug builds
Reviewed-by: egahlin, rwestberg

     1 /*

     2  * Copyright (c) 2014, 2018, 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_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP

    26 #define SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP

    28 #include "memory/allocation.hpp"

    29 #include "jfr/utilities/jfrTime.hpp"

    31 typedef u8 traceid;

    33 class BoolObjectClosure;

    34 class JfrStackTrace;

    35 class OopClosure;

    36 class ObjectSample;

    37 class ObjectSampler;

    38 class SampleList;

    39 class SamplePriorityQueue;

    40 class Thread;

    42 // Class reponsible for holding samples and

    43 // making sure the samples are evenly distributed as

    44 // new entries are added and removed.

    45 class ObjectSampler : public CHeapObj<mtTracing> {

    46   friend class EventEmitter;

    47   friend class JfrRecorderService;

    48   friend class LeakProfiler;

    49   friend class StartOperation;

    50   friend class StopOperation;

    51   friend class ObjectSampleCheckpoint;

    52   friend class WriteObjectSampleStacktrace;

    53  private:

    54   SamplePriorityQueue* _priority_queue;

    55   SampleList* _list;

    56   JfrTicks _last_sweep;

    57   size_t _total_allocated;

    58   size_t _threshold;

    59   size_t _size;

    60   bool _dead_samples;

    62   // Lifecycle

    63   explicit ObjectSampler(size_t size);

    64   ~ObjectSampler();

    65   static bool create(size_t size);

    66   static bool is_created();

    67   static ObjectSampler* sampler();

    68   static void destroy();

    70   // For operations that require exclusive access (non-safepoint)

    71   static ObjectSampler* acquire();

    72   static void release();

    74   // Stacktrace

    75   static void fill_stacktrace(JfrStackTrace* stacktrace, JavaThread* thread);

    76   traceid stacktrace_id(const JfrStackTrace* stacktrace, JavaThread* thread);

    78   // Sampling

    79   static void sample(HeapWord* object, size_t size, JavaThread* thread);

    80   void add(HeapWord* object, size_t size, traceid thread_id, JfrStackTrace* stacktrace, JavaThread* thread);

    81   void scavenge();

    82   void remove_dead(ObjectSample* sample);

    84   // Called by GC

    85   static void oops_do(BoolObjectClosure* is_alive, OopClosure* f);

    87   const ObjectSample* item_at(int index) const;

    88   ObjectSample* item_at(int index);

    89   int item_count() const;

    90   const ObjectSample* first() const;

    91   const ObjectSample* last() const;

    92   const ObjectSample* last_resolved() const;

    93   void set_last_resolved(const ObjectSample* sample);

    94   const JfrTicks& last_sweep() const;

    95 };

    97 #endif // SHARE_VM_LEAKPROFILER_SAMPLING_OBJECTSAMPLER_HPP

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