Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 795:215f81b4d9b3
6841831: G1: assert(contains_reference(from),"We just added it!") fires
Summary: During parallel rset updating we have to make sure that the worker ids of the refinement threads do not intersect with the worker ids that can be claimed by the mutator threads.
Reviewed-by: tonyp
author | iveresov |
---|---|
date | Mon, 18 May 2009 11:52:46 -0700 |
parents | 315a5d70b295 |
children | bd02caa94611 27f6a9b9c311 |
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/* * 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(); }