jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1StringDedupThread.hpp@595c0f60d50d

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

     1 /*

     2  * Copyright (c) 2014, 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

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    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPTHREAD_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPTHREAD_HPP

    28 #include "gc_implementation/g1/g1StringDedupStat.hpp"

    29 #include "gc_implementation/shared/concurrentGCThread.hpp"

    31 //

    32 // The deduplication thread is where the actual deduplication occurs. It waits for

    33 // deduplication candidates to appear on the deduplication queue, removes them from

    34 // the queue and tries to deduplicate them. It uses the deduplication hashtable to

    35 // find identical, already existing, character arrays on the heap. The thread runs

    36 // concurrently with the Java application but participates in safepoints to allow

    37 // the GC to adjust and unlink oops from the deduplication queue and table.

    38 //

    39 class G1StringDedupThread: public ConcurrentGCThread {

    40 private:

    41   static G1StringDedupThread* _thread;

    43   G1StringDedupThread();

    44   ~G1StringDedupThread();

    46   void print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat);

    48 public:

    49   static void create();

    50   static G1StringDedupThread* thread();

    52   virtual void run();

    53   virtual void print_on(outputStream* st) const;

    54 };

    56 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPTHREAD_HPP

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