jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp@29e7d79232b9 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp@29e7d79232b9 (annotated)

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

Tue, 19 May 2009 04:05:31 -0700

author: apetrusenko
date: Tue, 19 May 2009 04:05:31 -0700
changeset 1231: 29e7d79232b9
parent 1230: 215f81b4d9b3
child 1279: bd02caa94611
child 1318: 27f6a9b9c311
permissions: -rw-r--r--

6819065: G1: eliminate high serial card table clearing time
Reviewed-by: iveresov, tonyp

 /*
  * Copyright 2001-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_concurrentG1RefineThread.cpp.incl"
 // ======= Concurrent Mark Thread ========
 // The CM thread is created when the G1 garbage collector is used
 ConcurrentG1RefineThread::
 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread *next,
                          int worker_id_offset, int worker_id) :
   ConcurrentGCThread(),
   _worker_id_offset(worker_id_offset),
   _worker_id(worker_id),
   _active(false),
   _next(next),
   _cg1r(cg1r),
   _vtime_accum(0.0),
   _co_tracker(G1CRGroup),
   _interval_ms(5.0)
 {
   create_and_start();
 }
 void ConcurrentG1RefineThread::sample_young_list_rs_lengths() {
   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("G1 refine");
           // we just abandon the iteration
           break;
         }
         regions_visited = 0;
       }
     }
     g1p->check_prediction_validity();
   }
 }
 void ConcurrentG1RefineThread::run() {
   initialize_in_thread();
   _vtime_start = os::elapsedVTime();
   wait_for_universe_init();
   _co_tracker.enable();
   _co_tracker.start();
   while (!_should_terminate) {
     DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
     // Wait for completed log buffers to exist.
     {
       MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
       while (((_worker_id == 0 && !dcqs.process_completed_buffers()) ||
               (_worker_id > 0 && !is_active())) &&
              !_should_terminate) {
          DirtyCardQ_CBL_mon->wait(Mutex::_no_safepoint_check_flag);
       }
     }
     if (_should_terminate) {
       return;
     }
     // Now we take them off (this doesn't hold locks while it applies
     // closures.)  (If we did a full collection, then we'll do a full
     // traversal.
     _sts.join();
     int n_logs = 0;
     int lower_limit = 0;
     double start_vtime_sec; // only used when G1SmoothConcRefine is on
     int prev_buffer_num; // only used when G1SmoothConcRefine is on
     // This thread activation threshold
     int threshold = DCQBarrierProcessCompletedThreshold * _worker_id;
     // Next thread activation threshold
     int next_threshold = threshold + DCQBarrierProcessCompletedThreshold;
     int deactivation_threshold = MAX2<int>(threshold - DCQBarrierProcessCompletedThreshold / 2, 0);
     if (G1SmoothConcRefine) {
       lower_limit = 0;
       start_vtime_sec = os::elapsedVTime();
       prev_buffer_num = (int) dcqs.completed_buffers_num();
     } else {
       lower_limit = DCQBarrierProcessCompletedThreshold / 4; // For now.
     }
     while (dcqs.apply_closure_to_completed_buffer(_worker_id + _worker_id_offset, lower_limit)) {
       double end_vtime_sec;
       double elapsed_vtime_sec;
       int elapsed_vtime_ms;
       int curr_buffer_num = (int) dcqs.completed_buffers_num();
       if (G1SmoothConcRefine) {
         end_vtime_sec = os::elapsedVTime();
         elapsed_vtime_sec = end_vtime_sec - start_vtime_sec;
         elapsed_vtime_ms = (int) (elapsed_vtime_sec * 1000.0);
         if (curr_buffer_num > prev_buffer_num ||
             curr_buffer_num > next_threshold) {
           decreaseInterval(elapsed_vtime_ms);
         } else if (curr_buffer_num < prev_buffer_num) {
           increaseInterval(elapsed_vtime_ms);
         }
       }
       if (_worker_id == 0) {
         sample_young_list_rs_lengths();
       } else if (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.
         MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
         deactivate();
         if (G1TraceConcurrentRefinement) {
           gclog_or_tty->print_cr("G1-Refine-deactivated worker %d", _worker_id);
         }
         break;
       }
       _co_tracker.update(false);
       // Check if we need to activate the next thread.
       if (curr_buffer_num > next_threshold && _next != NULL && !_next->is_active()) {
         MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
         _next->activate();
         DirtyCardQ_CBL_mon->notify_all();
         if (G1TraceConcurrentRefinement) {
           gclog_or_tty->print_cr("G1-Refine-activated worker %d", _next->_worker_id);
         }
       }
       if (G1SmoothConcRefine) {
         prev_buffer_num = curr_buffer_num;
         _sts.leave();
         os::sleep(Thread::current(), (jlong) _interval_ms, false);
         _sts.join();
         start_vtime_sec = os::elapsedVTime();
       }
       n_logs++;
     }
     _co_tracker.update(false);
     _sts.leave();
     if (os::supports_vtime()) {
       _vtime_accum = (os::elapsedVTime() - _vtime_start);
     } else {
       _vtime_accum = 0.0;
     }
   }
   _sts.join();
   _co_tracker.update(true);
   _sts.leave();
   assert(_should_terminate, "just checking");
   terminate();
 }
 void ConcurrentG1RefineThread::yield() {
   if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield");
   _sts.yield("G1 refine");
   if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-yield-end");
 }
 void ConcurrentG1RefineThread::stop() {
   // it is ok to take late safepoints here, if needed
   {
     MutexLockerEx mu(Terminator_lock);
     _should_terminate = true;
   }
   {
     MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag);
     DirtyCardQ_CBL_mon->notify_all();
   }
   {
     MutexLockerEx mu(Terminator_lock);
     while (!_has_terminated) {
       Terminator_lock->wait();
     }
   }
   if (G1TraceConcurrentRefinement) gclog_or_tty->print_cr("G1-Refine-stop");
 }
 void ConcurrentG1RefineThread::print() {
   gclog_or_tty->print("\"Concurrent G1 Refinement Thread\" ");
   Thread::print();
   gclog_or_tty->cr();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp@29e7d79232b9 (annotated)

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