jdk8-mips64-public/hotspot: src/share/vm/jfr/leakprofiler/chains/edgeStore.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_CHAINS_EDGESTORE_HPP

    26 #define SHARE_VM_LEAKPROFILER_CHAINS_EDGESTORE_HPP

    28 #include "jfr/leakprofiler/chains/edge.hpp"

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

    30 #include "memory/allocation.hpp"

    32 typedef u8 traceid;

    34 class StoredEdge : public Edge {

    35  private:

    36   mutable traceid _gc_root_id;

    37   size_t _skip_length;

    39  public:

    40   StoredEdge();

    41   StoredEdge(const Edge* parent, const oop* reference);

    42   StoredEdge(const Edge& edge);

    43   StoredEdge(const StoredEdge& edge);

    44   void operator=(const StoredEdge& edge);

    46   traceid gc_root_id() const { return _gc_root_id; }

    47   void set_gc_root_id(traceid root_id) const { _gc_root_id = root_id; }

    49   bool is_skip_edge() const { return _skip_length != 0; }

    50   size_t skip_length() const { return _skip_length; }

    51   void set_skip_length(size_t length) { _skip_length = length; }

    53   void set_parent(const Edge* edge) { this->_parent = edge; }

    55   StoredEdge* parent() const {

    56     return const_cast<StoredEdge*>(static_cast<const StoredEdge*>(Edge::parent()));

    57   }

    58 };

    60 class EdgeStore : public CHeapObj<mtTracing> {

    61   typedef HashTableHost<StoredEdge, traceid, Entry, EdgeStore> EdgeHashTable;

    62   typedef EdgeHashTable::HashEntry EdgeEntry;

    63   template <typename,

    64             typename,

    65             template<typename, typename> class,

    66             typename,

    67             size_t>

    68   friend class HashTableHost;

    69   friend class EventEmitter;

    70   friend class ObjectSampleWriter;

    71   friend class ObjectSampleCheckpoint;

    72  private:

    73   static traceid _edge_id_counter;

    74   EdgeHashTable* _edges;

    76   // Hash table callbacks

    77   void assign_id(EdgeEntry* entry);

    78   bool equals(const Edge& query, uintptr_t hash, const EdgeEntry* entry);

    80   StoredEdge* get(const oop* reference) const;

    81   StoredEdge* put(const oop* reference);

    82   traceid gc_root_id(const Edge* edge) const;

    84   bool put_edges(StoredEdge** previous, const Edge** current, size_t length);

    85   bool put_skip_edge(StoredEdge** previous, const Edge** current, size_t distance_to_root);

    86   void put_chain_epilogue(StoredEdge* leak_context_edge, const Edge* root) const;

    88   StoredEdge* associate_leak_context_with_candidate(const Edge* edge);

    89   void store_gc_root_id_in_leak_context_edge(StoredEdge* leak_context_edge, const Edge* root) const;

    90   StoredEdge* link_new_edge(StoredEdge** previous, const Edge** current);

    91   void link_with_existing_chain(const StoredEdge* current_stored, StoredEdge** previous, size_t previous_length);

    93   template <typename T>

    94   void iterate(T& functor) const { _edges->iterate_value<T>(functor); }

    96   DEBUG_ONLY(bool contains(const oop* reference) const;)

    98  public:

    99   EdgeStore();

   100   ~EdgeStore();

   102   bool is_empty() const;

   103   traceid get_id(const Edge* edge) const;

   104   void put_chain(const Edge* chain, size_t length);

   105 };

   107 #endif // SHARE_VM_LEAKPROFILER_CHAINS_EDGESTORE_HPP

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