jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp

Thu, 12 Oct 2017 21:27:07 +0800

author: aoqi
date: Thu, 12 Oct 2017 21:27:07 +0800
changeset 7535: 7ae4e26cb1e0
parent 6930: 570cb6369f17
parent 6876: 710a3c8b516e
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "gc_implementation/g1/concurrentG1Refine.hpp"
 #include "gc_implementation/g1/concurrentG1RefineThread.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/mutexLocker.hpp"
 ConcurrentG1RefineThread::
 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread *next,
                          CardTableEntryClosure* refine_closure,
                          uint worker_id_offset, uint worker_id) :
   ConcurrentGCThread(),
   _refine_closure(refine_closure),
   _worker_id_offset(worker_id_offset),
   _worker_id(worker_id),
   _active(false),
   _next(next),
   _monitor(NULL),
   _cg1r(cg1r),
   _vtime_accum(0.0)
 {
   // Each thread has its own monitor. The i-th thread is responsible for signalling
   // to thread i+1 if the number of buffers in the queue exceeds a threashold for this
   // thread. Monitors are also used to wake up the threads during termination.
   // The 0th worker in notified by mutator threads and has a special monitor.
   // The last worker is used for young gen rset size sampling.
   if (worker_id > 0) {
     _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true);
   } else {
     _monitor = DirtyCardQ_CBL_mon;
   }
   initialize();
   create_and_start();
 }
 void ConcurrentG1RefineThread::initialize() {
   if (_worker_id < cg1r()->worker_thread_num()) {
     // Current thread activation threshold
     _threshold = MIN2<int>(cg1r()->thread_threshold_step() * (_worker_id + 1) + cg1r()->green_zone(),
                            cg1r()->yellow_zone());
     // A thread deactivates once the number of buffer reached a deactivation threshold
     _deactivation_threshold = MAX2<int>(_threshold - cg1r()->thread_threshold_step(), cg1r()->green_zone());
   } else {
     set_active(true);
   }
 }
 void ConcurrentG1RefineThread::sample_young_list_rs_lengths() {
   SuspendibleThreadSetJoiner sts;
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
   G1CollectorPolicy* g1p = g1h->g1_policy();
   if (g1p->adaptive_young_list_length()) {
     int regions_visited = 0;
     g1h->young_list()->rs_length_sampling_init();
     while (g1h->young_list()->rs_length_sampling_more()) {
       g1h->young_list()->rs_length_sampling_next();
       ++regions_visited;
       // we try to yield every time we visit 10 regions
       if (regions_visited == 10) {
         if (sts.should_yield()) {
           sts.yield();
           // we just abandon the iteration
           break;
         }
         regions_visited = 0;
       }
     }
     g1p->revise_young_list_target_length_if_necessary();
   }
 }
 void ConcurrentG1RefineThread::run_young_rs_sampling() {
   DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
   _vtime_start = os::elapsedVTime();
   while(!_should_terminate) {
     sample_young_list_rs_lengths();
     if (os::supports_vtime()) {
       _vtime_accum = (os::elapsedVTime() - _vtime_start);
     } else {
       _vtime_accum = 0.0;
     }
     MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
     if (_should_terminate) {
       break;
     }
     _monitor->wait(Mutex::_no_safepoint_check_flag, G1ConcRefinementServiceIntervalMillis);
   }
 }
 void ConcurrentG1RefineThread::wait_for_completed_buffers() {
   DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
   MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
   while (!_should_terminate && !is_active()) {
     _monitor->wait(Mutex::_no_safepoint_check_flag);
   }
 }
 bool ConcurrentG1RefineThread::is_active() {
   DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
   return _worker_id > 0 ? _active : dcqs.process_completed_buffers();
 }
 void ConcurrentG1RefineThread::activate() {
   MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
   if (_worker_id > 0) {
     if (G1TraceConcRefinement) {
       DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
       gclog_or_tty->print_cr("G1-Refine-activated worker %d, on threshold %d, current %d",
                              _worker_id, _threshold, (int)dcqs.completed_buffers_num());
     }
     set_active(true);
   } else {
     DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
     dcqs.set_process_completed(true);
   }
   _monitor->notify();
 }
 void ConcurrentG1RefineThread::deactivate() {
   MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
   if (_worker_id > 0) {
     if (G1TraceConcRefinement) {
       DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
       gclog_or_tty->print_cr("G1-Refine-deactivated worker %d, off threshold %d, current %d",
                              _worker_id, _deactivation_threshold, (int)dcqs.completed_buffers_num());
     }
     set_active(false);
   } else {
     DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
     dcqs.set_process_completed(false);
   }
 }
 void ConcurrentG1RefineThread::run() {
   initialize_in_thread();
   wait_for_universe_init();
   if (_worker_id >= cg1r()->worker_thread_num()) {
     run_young_rs_sampling();
     terminate();
     return;
   }
   _vtime_start = os::elapsedVTime();
   while (!_should_terminate) {
     DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
     // Wait for work
     wait_for_completed_buffers();
     if (_should_terminate) {
       break;
     }
     {
       SuspendibleThreadSetJoiner sts;
       do {
         int curr_buffer_num = (int)dcqs.completed_buffers_num();
         // If the number of the buffers falls down into the yellow zone,
         // that means that the transition period after the evacuation pause has ended.
         if (dcqs.completed_queue_padding() > 0 && curr_buffer_num <= cg1r()->yellow_zone()) {
           dcqs.set_completed_queue_padding(0);
         }
         if (_worker_id > 0 && curr_buffer_num <= _deactivation_threshold) {
           // If the number of the buffer has fallen below our threshold
           // we should deactivate. The predecessor will reactivate this
           // thread should the number of the buffers cross the threshold again.
           deactivate();
           break;
         }
         // Check if we need to activate the next thread.
         if (_next != NULL && !_next->is_active() && curr_buffer_num > _next->_threshold) {
           _next->activate();
         }
       } while (dcqs.apply_closure_to_completed_buffer(_refine_closure, _worker_id + _worker_id_offset, cg1r()->green_zone()));
       // We can exit the loop above while being active if there was a yield request.
       if (is_active()) {
         deactivate();
       }
     }
     if (os::supports_vtime()) {
       _vtime_accum = (os::elapsedVTime() - _vtime_start);
     } else {
       _vtime_accum = 0.0;
     }
   }
   assert(_should_terminate, "just checking");
   terminate();
 }
 void ConcurrentG1RefineThread::stop() {
   // it is ok to take late safepoints here, if needed
   {
     MutexLockerEx mu(Terminator_lock);
     _should_terminate = true;
   }
   {
     MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag);
     _monitor->notify();
   }
   {
     MutexLockerEx mu(Terminator_lock);
     while (!_has_terminated) {
       Terminator_lock->wait();
     }
   }
   if (G1TraceConcRefinement) {
     gclog_or_tty->print_cr("G1-Refine-stop");
   }
 }
 void ConcurrentG1RefineThread::print() const {
   print_on(tty);
 }
 void ConcurrentG1RefineThread::print_on(outputStream* st) const {
   st->print("\"G1 Concurrent Refinement Thread#%d\" ", _worker_id);
   Thread::print_on(st);
   st->cr();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp