jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp@8847586c9037

8016302: Change type of the number of GC workers to unsigned int (2)
Reviewed-by: tschatzl, jwilhelm

     1 /*

     2  * Copyright (c) 2001, 2013, 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/concurrentG1Refine.hpp"

    27 #include "gc_implementation/g1/concurrentG1RefineThread.hpp"

    28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

    29 #include "gc_implementation/g1/g1HotCardCache.hpp"

    30 #include "runtime/java.hpp"

    32 ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) :

    33   _threads(NULL), _n_threads(0),

    34   _hot_card_cache(g1h)

    35 {

    36   // Ergomonically select initial concurrent refinement parameters

    37   if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {

    38     FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1));

    39   }

    40   set_green_zone(G1ConcRefinementGreenZone);

    42   if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {

    43     FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3);

    44   }

    45   set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone()));

    47   if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {

    48     FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2);

    49   }

    50   set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone()));

    52   _n_worker_threads = thread_num();

    53   // We need one extra thread to do the young gen rset size sampling.

    54   _n_threads = _n_worker_threads + 1;

    56   reset_threshold_step();

    58   _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC);

    60   uint worker_id_offset = DirtyCardQueueSet::num_par_ids();

    62   ConcurrentG1RefineThread *next = NULL;

    63   for (uint i = _n_threads - 1; i != UINT_MAX; i--) {

    64     ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i);

    65     assert(t != NULL, "Conc refine should have been created");

    66     if (t->osthread() == NULL) {

    67         vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");

    68     }

    70     assert(t->cg1r() == this, "Conc refine thread should refer to this");

    71     _threads[i] = t;

    72     next = t;

    73   }

    74 }

    76 void ConcurrentG1Refine::reset_threshold_step() {

    77   if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) {

    78     _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1);

    79   } else {

    80     _thread_threshold_step = G1ConcRefinementThresholdStep;

    81   }

    82 }

    84 void ConcurrentG1Refine::init() {

    85   _hot_card_cache.initialize();

    86 }

    88 void ConcurrentG1Refine::stop() {

    89   if (_threads != NULL) {

    90     for (uint i = 0; i < _n_threads; i++) {

    91       _threads[i]->stop();

    92     }

    93   }

    94 }

    96 void ConcurrentG1Refine::reinitialize_threads() {

    97   reset_threshold_step();

    98   if (_threads != NULL) {

    99     for (uint i = 0; i < _n_threads; i++) {

   100       _threads[i]->initialize();

   101     }

   102   }

   103 }

   105 ConcurrentG1Refine::~ConcurrentG1Refine() {

   106   if (_threads != NULL) {

   107     for (uint i = 0; i < _n_threads; i++) {

   108       delete _threads[i];

   109     }

   110     FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC);

   111   }

   112 }

   114 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) {

   115   if (_threads != NULL) {

   116     for (uint i = 0; i < _n_threads; i++) {

   117       tc->do_thread(_threads[i]);

   118     }

   119   }

   120 }

   122 void ConcurrentG1Refine::worker_threads_do(ThreadClosure * tc) {

   123   if (_threads != NULL) {

   124     for (uint i = 0; i < worker_thread_num(); i++) {

   125       tc->do_thread(_threads[i]);

   126     }

   127   }

   128 }

   130 uint ConcurrentG1Refine::thread_num() {

   131   uint n_threads = (G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads

   132                                                 : ParallelGCThreads;

   133   return MAX2<uint>(n_threads, 1);

   134 }

   136 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const {

   137   for (uint i = 0; i < _n_threads; ++i) {

   138     _threads[i]->print_on(st);

   139     st->cr();

   140   }

   141 }

   143 ConcurrentG1RefineThread * ConcurrentG1Refine::sampling_thread() const {

   144   return _threads[worker_thread_num()];

   145 }

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