jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1StringDedupThread.cpp@f90c822e73f8

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

     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

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "gc_implementation/g1/g1Log.hpp"

    27 #include "gc_implementation/g1/g1StringDedup.hpp"

    28 #include "gc_implementation/g1/g1StringDedupTable.hpp"

    29 #include "gc_implementation/g1/g1StringDedupThread.hpp"

    30 #include "gc_implementation/g1/g1StringDedupQueue.hpp"

    32 G1StringDedupThread* G1StringDedupThread::_thread = NULL;

    34 G1StringDedupThread::G1StringDedupThread() :

    35   ConcurrentGCThread() {

    36   set_name("String Deduplication Thread");

    37   create_and_start();

    38 }

    40 G1StringDedupThread::~G1StringDedupThread() {

    41   ShouldNotReachHere();

    42 }

    44 void G1StringDedupThread::create() {

    45   assert(G1StringDedup::is_enabled(), "String deduplication not enabled");

    46   assert(_thread == NULL, "One string deduplication thread allowed");

    47   _thread = new G1StringDedupThread();

    48 }

    50 G1StringDedupThread* G1StringDedupThread::thread() {

    51   assert(G1StringDedup::is_enabled(), "String deduplication not enabled");

    52   assert(_thread != NULL, "String deduplication thread not created");

    53   return _thread;

    54 }

    56 void G1StringDedupThread::print_on(outputStream* st) const {

    57   st->print("\"%s\" ", name());

    58   Thread::print_on(st);

    59   st->cr();

    60 }

    62 void G1StringDedupThread::run() {

    63   G1StringDedupStat total_stat;

    65   initialize_in_thread();

    66   wait_for_universe_init();

    68   // Main loop

    69   for (;;) {

    70     G1StringDedupStat stat;

    72     stat.mark_idle();

    74     // Wait for the queue to become non-empty

    75     G1StringDedupQueue::wait();

    76     if (_should_terminate) {

    77       break;

    78     }

    80     // Include this thread in safepoints

    81     stsJoin();

    83     stat.mark_exec();

    85     // Process the queue

    86     for (;;) {

    87       oop java_string = G1StringDedupQueue::pop();

    88       if (java_string == NULL) {

    89         break;

    90       }

    92       G1StringDedupTable::deduplicate(java_string, stat);

    94       // Safepoint this thread if needed

    95       if (stsShouldYield()) {

    96         stat.mark_block();

    97         stsYield(NULL);

    98         stat.mark_unblock();

    99       }

   100     }

   102     G1StringDedupTable::trim_entry_cache();

   104     stat.mark_done();

   106     // Print statistics

   107     total_stat.add(stat);

   108     print(gclog_or_tty, stat, total_stat);

   110     // Exclude this thread from safepoints

   111     stsLeave();

   112   }

   114   terminate();

   115 }

   117 void G1StringDedupThread::stop() {

   118   {

   119     MonitorLockerEx ml(Terminator_lock);

   120     _thread->_should_terminate = true;

   121   }

   123   G1StringDedupQueue::cancel_wait();

   125   {

   126     MonitorLockerEx ml(Terminator_lock);

   127     while (!_thread->_has_terminated) {

   128       ml.wait();

   129     }

   130   }

   131 }

   133 void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) {

   134   if (G1Log::fine() || PrintStringDeduplicationStatistics) {

   135     G1StringDedupStat::print_summary(st, last_stat, total_stat);

   136     if (PrintStringDeduplicationStatistics) {

   137       G1StringDedupStat::print_statistics(st, last_stat, false);

   138       G1StringDedupStat::print_statistics(st, total_stat, true);

   139       G1StringDedupTable::print_statistics(st);

   140       G1StringDedupQueue::print_statistics(st);

   141     }

   142   }

   143 }

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