Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/concurrentMarkSweep/vmCMSOperations.cpp @ 17748:d60ecdb2773e
8031703: Missing post-barrier in ReferenceProcessor
Reviewed-by: tonyp, tschatzl
author | pliden |
---|---|
date | Thu, 06 Feb 2014 14:12:43 +0100 |
parents | 86e6d691f2e1 |
children | a3ba776d6ab6 78bbf4d43a14 |
line wrap: on
line source
/* * Copyright (c) 2005, 2013, 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/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp" #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" #include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" #include "gc_implementation/shared/gcTimer.hpp" #include "gc_implementation/shared/gcTraceTime.hpp" #include "gc_implementation/shared/isGCActiveMark.hpp" #include "memory/gcLocker.inline.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/os.hpp" #include "utilities/dtrace.hpp" #ifndef USDT2 HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__begin); HS_DTRACE_PROBE_DECL(hs_private, cms__initmark__end); HS_DTRACE_PROBE_DECL(hs_private, cms__remark__begin); HS_DTRACE_PROBE_DECL(hs_private, cms__remark__end); #endif /* !USDT2 */ ////////////////////////////////////////////////////////// // Methods in abstract class VM_CMS_Operation ////////////////////////////////////////////////////////// void VM_CMS_Operation::acquire_pending_list_lock() { // The caller may block while communicating // with the SLT thread in order to acquire/release the PLL. ConcurrentMarkSweepThread::slt()-> manipulatePLL(SurrogateLockerThread::acquirePLL); } void VM_CMS_Operation::release_and_notify_pending_list_lock() { // The caller may block while communicating // with the SLT thread in order to acquire/release the PLL. ConcurrentMarkSweepThread::slt()-> manipulatePLL(SurrogateLockerThread::releaseAndNotifyPLL); } void VM_CMS_Operation::verify_before_gc() { if (VerifyBeforeGC && GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { GCTraceTime tm("Verify Before", false, false, _collector->_gc_timer_cm); HandleMark hm; FreelistLocker x(_collector); MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); Universe::heap()->prepare_for_verify(); Universe::verify(); } } void VM_CMS_Operation::verify_after_gc() { if (VerifyAfterGC && GenCollectedHeap::heap()->total_collections() >= VerifyGCStartAt) { GCTraceTime tm("Verify After", false, false, _collector->_gc_timer_cm); HandleMark hm; FreelistLocker x(_collector); MutexLockerEx y(_collector->bitMapLock(), Mutex::_no_safepoint_check_flag); Universe::verify(); } } bool VM_CMS_Operation::lost_race() const { if (CMSCollector::abstract_state() == CMSCollector::Idling) { // We lost a race to a foreground collection // -- there's nothing to do return true; } assert(CMSCollector::abstract_state() == legal_state(), "Inconsistent collector state?"); return false; } bool VM_CMS_Operation::doit_prologue() { assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), "Possible deadlock"); if (needs_pll()) { acquire_pending_list_lock(); } // Get the Heap_lock after the pending_list_lock. Heap_lock->lock(); if (lost_race()) { assert(_prologue_succeeded == false, "Initialized in c'tor"); Heap_lock->unlock(); if (needs_pll()) { release_and_notify_pending_list_lock(); } } else { _prologue_succeeded = true; } return _prologue_succeeded; } void VM_CMS_Operation::doit_epilogue() { assert(Thread::current()->is_ConcurrentGC_thread(), "just checking"); assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock"); assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(), "Possible deadlock"); // Release the Heap_lock first. Heap_lock->unlock(); if (needs_pll()) { release_and_notify_pending_list_lock(); } } ////////////////////////////////////////////////////////// // Methods in class VM_CMS_Initial_Mark ////////////////////////////////////////////////////////// void VM_CMS_Initial_Mark::doit() { if (lost_race()) { // Nothing to do. return; } #ifndef USDT2 HS_DTRACE_PROBE(hs_private, cms__initmark__begin); #else /* USDT2 */ HS_PRIVATE_CMS_INITMARK_BEGIN( ); #endif /* USDT2 */ _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark"); GenCollectedHeap* gch = GenCollectedHeap::heap(); GCCauseSetter gccs(gch, GCCause::_cms_initial_mark); VM_CMS_Operation::verify_before_gc(); IsGCActiveMark x; // stop-world GC active _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsInitial, gch->gc_cause()); VM_CMS_Operation::verify_after_gc(); _collector->_gc_timer_cm->register_gc_pause_end(); #ifndef USDT2 HS_DTRACE_PROBE(hs_private, cms__initmark__end); #else /* USDT2 */ HS_PRIVATE_CMS_INITMARK_END( ); #endif /* USDT2 */ } ////////////////////////////////////////////////////////// // Methods in class VM_CMS_Final_Remark_Operation ////////////////////////////////////////////////////////// void VM_CMS_Final_Remark::doit() { if (lost_race()) { // Nothing to do. return; } #ifndef USDT2 HS_DTRACE_PROBE(hs_private, cms__remark__begin); #else /* USDT2 */ HS_PRIVATE_CMS_REMARK_BEGIN( ); #endif /* USDT2 */ _collector->_gc_timer_cm->register_gc_pause_start("Final Mark"); GenCollectedHeap* gch = GenCollectedHeap::heap(); GCCauseSetter gccs(gch, GCCause::_cms_final_remark); VM_CMS_Operation::verify_before_gc(); IsGCActiveMark x; // stop-world GC active _collector->do_CMS_operation(CMSCollector::CMS_op_checkpointRootsFinal, gch->gc_cause()); VM_CMS_Operation::verify_after_gc(); _collector->save_heap_summary(); _collector->_gc_timer_cm->register_gc_pause_end(); #ifndef USDT2 HS_DTRACE_PROBE(hs_private, cms__remark__end); #else /* USDT2 */ HS_PRIVATE_CMS_REMARK_END( ); #endif /* USDT2 */ } // VM operation to invoke a concurrent collection of a // GenCollectedHeap heap. void VM_GenCollectFullConcurrent::doit() { assert(Thread::current()->is_VM_thread(), "Should be VM thread"); assert(GCLockerInvokesConcurrent || ExplicitGCInvokesConcurrent, "Unexpected"); GenCollectedHeap* gch = GenCollectedHeap::heap(); if (_gc_count_before == gch->total_collections()) { // The "full" of do_full_collection call below "forces" // a collection; the second arg, 0, below ensures that // only the young gen is collected. XXX In the future, // we'll probably need to have something in this interface // to say do this only if we are sure we will not bail // out to a full collection in this attempt, but that's // for the future. assert(SafepointSynchronize::is_at_safepoint(), "We can only be executing this arm of if at a safepoint"); GCCauseSetter gccs(gch, _gc_cause); gch->do_full_collection(gch->must_clear_all_soft_refs(), 0 /* collect only youngest gen */); } // Else no need for a foreground young gc assert((_gc_count_before < gch->total_collections()) || (GC_locker::is_active() /* gc may have been skipped */ && (_gc_count_before == gch->total_collections())), "total_collections() should be monotonically increasing"); MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag); assert(_full_gc_count_before <= gch->total_full_collections(), "Error"); if (gch->total_full_collections() == _full_gc_count_before) { // Disable iCMS until the full collection is done, and // remember that we did so. CMSCollector::disable_icms(); _disabled_icms = true; // In case CMS thread was in icms_wait(), wake it up. CMSCollector::start_icms(); // Nudge the CMS thread to start a concurrent collection. CMSCollector::request_full_gc(_full_gc_count_before, _gc_cause); } else { assert(_full_gc_count_before < gch->total_full_collections(), "Error"); FullGCCount_lock->notify_all(); // Inform the Java thread its work is done } } bool VM_GenCollectFullConcurrent::evaluate_at_safepoint() const { Thread* thr = Thread::current(); assert(thr != NULL, "Unexpected tid"); if (!thr->is_Java_thread()) { assert(thr->is_VM_thread(), "Expected to be evaluated by VM thread"); GenCollectedHeap* gch = GenCollectedHeap::heap(); if (_gc_count_before != gch->total_collections()) { // No need to do a young gc, we'll just nudge the CMS thread // in the doit() method above, to be executed soon. assert(_gc_count_before < gch->total_collections(), "total_collections() should be monotnically increasing"); return false; // no need for foreground young gc } } return true; // may still need foreground young gc } void VM_GenCollectFullConcurrent::doit_epilogue() { Thread* thr = Thread::current(); assert(thr->is_Java_thread(), "just checking"); JavaThread* jt = (JavaThread*)thr; // Release the Heap_lock first. Heap_lock->unlock(); release_and_notify_pending_list_lock(); // It is fine to test whether completed collections has // exceeded our request count without locking because // the completion count is monotonically increasing; // this will break for very long-running apps when the // count overflows and wraps around. XXX fix me !!! // e.g. at the rate of 1 full gc per ms, this could // overflow in about 1000 years. GenCollectedHeap* gch = GenCollectedHeap::heap(); if (_gc_cause != GCCause::_gc_locker && gch->total_full_collections_completed() <= _full_gc_count_before) { // maybe we should change the condition to test _gc_cause == // GCCause::_java_lang_system_gc, instead of // _gc_cause != GCCause::_gc_locker assert(_gc_cause == GCCause::_java_lang_system_gc, "the only way to get here if this was a System.gc()-induced GC"); assert(ExplicitGCInvokesConcurrent, "Error"); // Now, wait for witnessing concurrent gc cycle to complete, // but do so in native mode, because we want to lock the // FullGCEvent_lock, which may be needed by the VM thread // or by the CMS thread, so we do not want to be suspended // while holding that lock. ThreadToNativeFromVM native(jt); MutexLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); // Either a concurrent or a stop-world full gc is sufficient // witness to our request. while (gch->total_full_collections_completed() <= _full_gc_count_before) { FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag); } } // Enable iCMS back if we disabled it earlier. if (_disabled_icms) { CMSCollector::enable_icms(); } }