aoqi@0: /*
aoqi@0:  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "gc_implementation/g1/concurrentG1Refine.hpp"
aoqi@0: #include "gc_implementation/g1/concurrentG1RefineThread.hpp"
aoqi@0: #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
aoqi@0: #include "gc_implementation/g1/g1HotCardCache.hpp"
aoqi@0: #include "runtime/java.hpp"
aoqi@0: 
aoqi@0: ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) :
aoqi@0:   _threads(NULL), _n_threads(0),
aoqi@0:   _hot_card_cache(g1h)
aoqi@0: {
aoqi@0:   // Ergomonically select initial concurrent refinement parameters
aoqi@0:   if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
aoqi@0:     FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1));
aoqi@0:   }
aoqi@0:   set_green_zone(G1ConcRefinementGreenZone);
aoqi@0: 
aoqi@0:   if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
aoqi@0:     FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3);
aoqi@0:   }
aoqi@0:   set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone()));
aoqi@0: 
aoqi@0:   if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
aoqi@0:     FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2);
aoqi@0:   }
aoqi@0:   set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone()));
aoqi@0: 
aoqi@0:   _n_worker_threads = thread_num();
aoqi@0:   // We need one extra thread to do the young gen rset size sampling.
aoqi@0:   _n_threads = _n_worker_threads + 1;
aoqi@0: 
aoqi@0:   reset_threshold_step();
aoqi@0: 
aoqi@0:   _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC);
aoqi@0: 
aoqi@0:   uint worker_id_offset = DirtyCardQueueSet::num_par_ids();
aoqi@0: 
aoqi@0:   ConcurrentG1RefineThread *next = NULL;
aoqi@0:   for (uint i = _n_threads - 1; i != UINT_MAX; i--) {
aoqi@0:     ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i);
aoqi@0:     assert(t != NULL, "Conc refine should have been created");
aoqi@0:     if (t->osthread() == NULL) {
aoqi@0:         vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
aoqi@0:     }
aoqi@0: 
aoqi@0:     assert(t->cg1r() == this, "Conc refine thread should refer to this");
aoqi@0:     _threads[i] = t;
aoqi@0:     next = t;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::reset_threshold_step() {
aoqi@0:   if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) {
aoqi@0:     _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1);
aoqi@0:   } else {
aoqi@0:     _thread_threshold_step = G1ConcRefinementThresholdStep;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::init() {
aoqi@0:   _hot_card_cache.initialize();
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::stop() {
aoqi@0:   if (_threads != NULL) {
aoqi@0:     for (uint i = 0; i < _n_threads; i++) {
aoqi@0:       _threads[i]->stop();
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::reinitialize_threads() {
aoqi@0:   reset_threshold_step();
aoqi@0:   if (_threads != NULL) {
aoqi@0:     for (uint i = 0; i < _n_threads; i++) {
aoqi@0:       _threads[i]->initialize();
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: ConcurrentG1Refine::~ConcurrentG1Refine() {
aoqi@0:   if (_threads != NULL) {
aoqi@0:     for (uint i = 0; i < _n_threads; i++) {
aoqi@0:       delete _threads[i];
aoqi@0:     }
aoqi@0:     FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::threads_do(ThreadClosure *tc) {
aoqi@0:   if (_threads != NULL) {
aoqi@0:     for (uint i = 0; i < _n_threads; i++) {
aoqi@0:       tc->do_thread(_threads[i]);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::worker_threads_do(ThreadClosure * tc) {
aoqi@0:   if (_threads != NULL) {
aoqi@0:     for (uint i = 0; i < worker_thread_num(); i++) {
aoqi@0:       tc->do_thread(_threads[i]);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: uint ConcurrentG1Refine::thread_num() {
aoqi@0:   uint n_threads = (G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads
aoqi@0:                                                 : ParallelGCThreads;
aoqi@0:   return MAX2<uint>(n_threads, 1);
aoqi@0: }
aoqi@0: 
aoqi@0: void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const {
aoqi@0:   for (uint i = 0; i < _n_threads; ++i) {
aoqi@0:     _threads[i]->print_on(st);
aoqi@0:     st->cr();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: ConcurrentG1RefineThread * ConcurrentG1Refine::sampling_thread() const {
aoqi@0:   return _threads[worker_thread_num()];
aoqi@0: }