Mercurial > hg > graal-compiler
diff src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
---|---|
date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | 7ea5ca260b28 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp Thu Jun 05 15:57:56 2008 -0700 @@ -0,0 +1,336 @@ +/* + * 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/_concurrentMarkThread.cpp.incl" + +// ======= Concurrent Mark Thread ======== + +// The CM thread is created when the G1 garbage collector is used + +SurrogateLockerThread* + ConcurrentMarkThread::_slt = NULL; + +ConcurrentMarkThread::ConcurrentMarkThread(ConcurrentMark* cm) : + ConcurrentGCThread(), + _cm(cm), + _started(false), + _in_progress(false), + _vtime_accum(0.0), + _vtime_mark_accum(0.0), + _vtime_count_accum(0.0) +{ + create_and_start(); +} + +class CMCheckpointRootsInitialClosure: public VoidClosure { + + ConcurrentMark* _cm; +public: + + CMCheckpointRootsInitialClosure(ConcurrentMark* cm) : + _cm(cm) {} + + void do_void(){ + _cm->checkpointRootsInitial(); + } +}; + +class CMCheckpointRootsFinalClosure: public VoidClosure { + + ConcurrentMark* _cm; +public: + + CMCheckpointRootsFinalClosure(ConcurrentMark* cm) : + _cm(cm) {} + + void do_void(){ + _cm->checkpointRootsFinal(false); // !clear_all_soft_refs + } +}; + +class CMCleanUp: public VoidClosure { + ConcurrentMark* _cm; +public: + + CMCleanUp(ConcurrentMark* cm) : + _cm(cm) {} + + void do_void(){ + _cm->cleanup(); + } +}; + + + +void ConcurrentMarkThread::run() { + initialize_in_thread(); + _vtime_start = os::elapsedVTime(); + wait_for_universe_init(); + + G1CollectedHeap* g1 = G1CollectedHeap::heap(); + G1CollectorPolicy* g1_policy = g1->g1_policy(); + G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); + Thread *current_thread = Thread::current(); + + while (!_should_terminate) { + // wait until started is set. + sleepBeforeNextCycle(); + { + ResourceMark rm; + HandleMark hm; + double cycle_start = os::elapsedVTime(); + double mark_start_sec = os::elapsedTime(); + char verbose_str[128]; + + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + tty->print_cr("[GC concurrent-mark-start]"); + } + + if (!g1_policy->in_young_gc_mode()) { + // this ensures the flag is not set if we bail out of the marking + // cycle; normally the flag is cleared immediately after cleanup + g1->set_marking_complete(); + + if (g1_policy->adaptive_young_list_length()) { + double now = os::elapsedTime(); + double init_prediction_ms = g1_policy->predict_init_time_ms(); + jlong sleep_time_ms = mmu_tracker->when_ms(now, init_prediction_ms); + os::sleep(current_thread, sleep_time_ms, false); + } + + // We don't have to skip here if we've been asked to restart, because + // in the worst case we just enqueue a new VM operation to start a + // marking. Note that the init operation resets has_aborted() + CMCheckpointRootsInitialClosure init_cl(_cm); + strcpy(verbose_str, "GC initial-mark"); + VM_CGC_Operation op(&init_cl, verbose_str); + VMThread::execute(&op); + } + + int iter = 0; + do { + iter++; + if (!cm()->has_aborted()) { + _cm->markFromRoots(); + } else { + if (TraceConcurrentMark) + gclog_or_tty->print_cr("CM-skip-mark-from-roots"); + } + + double mark_end_time = os::elapsedVTime(); + double mark_end_sec = os::elapsedTime(); + _vtime_mark_accum += (mark_end_time - cycle_start); + if (!cm()->has_aborted()) { + if (g1_policy->adaptive_young_list_length()) { + double now = os::elapsedTime(); + double remark_prediction_ms = g1_policy->predict_remark_time_ms(); + jlong sleep_time_ms = mmu_tracker->when_ms(now, remark_prediction_ms); + os::sleep(current_thread, sleep_time_ms, false); + } + + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-mark-end, %1.7lf sec]", + mark_end_sec - mark_start_sec); + } + + CMCheckpointRootsFinalClosure final_cl(_cm); + sprintf(verbose_str, "GC remark"); + VM_CGC_Operation op(&final_cl, verbose_str); + VMThread::execute(&op); + } else { + if (TraceConcurrentMark) + gclog_or_tty->print_cr("CM-skip-remark"); + } + if (cm()->restart_for_overflow() && + G1TraceMarkStackOverflow) { + gclog_or_tty->print_cr("Restarting conc marking because of MS overflow " + "in remark (restart #%d).", iter); + } + + if (cm()->restart_for_overflow()) { + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-mark-restart-for-overflow]"); + } + } + } while (cm()->restart_for_overflow()); + double counting_start_time = os::elapsedVTime(); + + // YSR: These look dubious (i.e. redundant) !!! FIX ME + slt()->manipulatePLL(SurrogateLockerThread::acquirePLL); + slt()->manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); + + if (!cm()->has_aborted()) { + double count_start_sec = os::elapsedTime(); + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-count-start]"); + } + + _sts.join(); + _cm->calcDesiredRegions(); + _sts.leave(); + + if (!cm()->has_aborted()) { + double count_end_sec = os::elapsedTime(); + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-count-end, %1.7lf]", + count_end_sec - count_start_sec); + } + } + } else { + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-skip-end-game"); + } + double end_time = os::elapsedVTime(); + _vtime_count_accum += (end_time - counting_start_time); + // Update the total virtual time before doing this, since it will try + // to measure it to get the vtime for this marking. We purposely + // neglect the presumably-short "completeCleanup" phase here. + _vtime_accum = (end_time - _vtime_start); + if (!cm()->has_aborted()) { + if (g1_policy->adaptive_young_list_length()) { + double now = os::elapsedTime(); + double cleanup_prediction_ms = g1_policy->predict_cleanup_time_ms(); + jlong sleep_time_ms = mmu_tracker->when_ms(now, cleanup_prediction_ms); + os::sleep(current_thread, sleep_time_ms, false); + } + + CMCleanUp cl_cl(_cm); + sprintf(verbose_str, "GC cleanup"); + VM_CGC_Operation op(&cl_cl, verbose_str); + VMThread::execute(&op); + } else { + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-skip-cleanup"); + G1CollectedHeap::heap()->set_marking_complete(); + } + + if (!cm()->has_aborted()) { + double cleanup_start_sec = os::elapsedTime(); + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-cleanup-start]"); + } + + // Now do the remainder of the cleanup operation. + _sts.join(); + _cm->completeCleanup(); + if (!cm()->has_aborted()) { + g1_policy->record_concurrent_mark_cleanup_completed(); + + double cleanup_end_sec = os::elapsedTime(); + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-cleanup-end, %1.7lf]", + cleanup_end_sec - cleanup_start_sec); + } + } + _sts.leave(); + } + // We're done: no more unclean regions coming. + G1CollectedHeap::heap()->set_unclean_regions_coming(false); + + if (cm()->has_aborted()) { + if (PrintGC) { + gclog_or_tty->date_stamp(PrintGCDateStamps); + gclog_or_tty->stamp(PrintGCTimeStamps); + gclog_or_tty->print_cr("[GC concurrent-mark-abort]"); + } + } + + _sts.join(); + _cm->disable_co_trackers(); + _sts.leave(); + + // we now want to allow clearing of the marking bitmap to be + // suspended by a collection pause. + _sts.join(); + _cm->clearNextBitmap(); + _sts.leave(); + } + } + assert(_should_terminate, "just checking"); + + terminate(); +} + + +void ConcurrentMarkThread::yield() { + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-yield"); + _sts.yield("Concurrent Mark"); + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-yield-end"); +} + +void ConcurrentMarkThread::stop() { + // it is ok to take late safepoints here, if needed + MutexLockerEx mu(Terminator_lock); + _should_terminate = true; + while (!_has_terminated) { + Terminator_lock->wait(); + } + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-stop"); +} + +void ConcurrentMarkThread::print() { + gclog_or_tty->print("\"Concurrent Mark GC Thread\" "); + Thread::print(); + gclog_or_tty->cr(); +} + +void ConcurrentMarkThread::sleepBeforeNextCycle() { + clear_in_progress(); + // We join here because we don't want to do the "shouldConcurrentMark()" + // below while the world is otherwise stopped. + MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); + while (!started()) { + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-sleeping"); + CGC_lock->wait(Mutex::_no_safepoint_check_flag); + } + set_in_progress(); + clear_started(); + if (TraceConcurrentMark) gclog_or_tty->print_cr("CM-starting"); + + return; +} + +// Note: this method, although exported by the ConcurrentMarkSweepThread, +// which is a non-JavaThread, can only be called by a JavaThread. +// Currently this is done at vm creation time (post-vm-init) by the +// main/Primordial (Java)Thread. +// XXX Consider changing this in the future to allow the CMS thread +// itself to create this thread? +void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { + assert(_slt == NULL, "SLT already created"); + _slt = SurrogateLockerThread::make(THREAD); +}