Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/concurrentG1RefineThread.cpp @ 605:98cb887364d3
6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never
author | twisti |
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date | Fri, 27 Feb 2009 13:27:09 -0800 |
parents | 37f87013dfd8 |
children | 4f360ec815ba |
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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) : ConcurrentGCThread(), _cg1r(cg1r), _started(false), _in_progress(false), _do_traversal(false), _vtime_accum(0.0), _co_tracker(G1CRGroup), _interval_ms(5.0) { create_and_start(); } const long timeout = 200; // ms. void ConcurrentG1RefineThread::traversalBasedRefinement() { _cg1r->wait_for_ConcurrentG1Refine_enabled(); MutexLocker x(G1ConcRefine_mon); while (_cg1r->enabled()) { MutexUnlocker ux(G1ConcRefine_mon); ResourceMark rm; HandleMark hm; if (TraceG1Refine) gclog_or_tty->print_cr("G1-Refine starting pass"); _sts.join(); bool no_sleep = _cg1r->refine(); _sts.leave(); if (!no_sleep) { MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); // We do this only for the timeout; we don't expect this to be signalled. CGC_lock->wait(Mutex::_no_safepoint_check_flag, timeout); } } } void ConcurrentG1RefineThread::queueBasedRefinement() { 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 (!_do_traversal && !dcqs.process_completed_buffers() && !_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(); if (_do_traversal) { (void)_cg1r->refine(); switch (_cg1r->get_last_pya()) { case PYA_cancel: case PYA_continue: // Continue was caught and handled inside "refine". If it's still // "continue" when we get here, we're done. _do_traversal = false; break; case PYA_restart: assert(_do_traversal, "Because of Full GC."); break; } } else { 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 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(0, lower_limit)) { double end_vtime_sec; double elapsed_vtime_sec; int elapsed_vtime_ms; int curr_buffer_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); curr_buffer_num = (int) dcqs.completed_buffers_num(); if (curr_buffer_num > prev_buffer_num || curr_buffer_num > DCQBarrierProcessCompletedThreshold) { decreaseInterval(elapsed_vtime_ms); } else if (curr_buffer_num < prev_buffer_num) { increaseInterval(elapsed_vtime_ms); } } sample_young_list_rs_lengths(); _co_tracker.update(false); if (G1SmoothConcRefine) { start_vtime_sec = os::elapsedVTime(); prev_buffer_num = curr_buffer_num; _sts.leave(); os::sleep(Thread::current(), (jlong) _interval_ms, false); _sts.join(); } n_logs++; } // Make sure we harvest the PYA, if any. (void)_cg1r->get_pya(); } _sts.leave(); } 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) { // wait until started is set. if (G1RSBarrierUseQueue) { queueBasedRefinement(); } else { traversalBasedRefinement(); } _sts.join(); _co_tracker.update(); _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 (TraceG1Refine) gclog_or_tty->print_cr("G1-Refine-yield"); _sts.yield("G1 refine"); if (TraceG1Refine) 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 (TraceG1Refine) 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(); } void ConcurrentG1RefineThread::set_do_traversal(bool b) { _do_traversal = b; }