ysr@777: /*
stefank@2314:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
stefank@2314: #include "gc_implementation/g1/g1CollectorPolicy.hpp"
stefank@2314: #include "gc_implementation/g1/vm_operations_g1.hpp"
stefank@2314: #include "gc_implementation/shared/isGCActiveMark.hpp"
stefank@2314: #include "runtime/interfaceSupport.hpp"
ysr@777: 
ysr@777: void VM_G1CollectForAllocation::doit() {
ysr@777:   JvmtiGCForAllocationMarker jgcm;
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777:   _res = g1h->satisfy_failed_allocation(_size);
ysr@777:   assert(g1h->is_in_or_null(_res), "result not in heap");
ysr@777: }
ysr@777: 
ysr@777: void VM_G1CollectFull::doit() {
ysr@777:   JvmtiGCFullMarker jgcm;
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
ysr@777:   GCCauseSetter x(g1h, _gc_cause);
ysr@777:   g1h->do_full_collection(false /* clear_all_soft_refs */);
ysr@777: }
ysr@777: 
ysr@777: void VM_G1IncCollectionPause::doit() {
ysr@777:   JvmtiGCForAllocationMarker jgcm;
ysr@777:   G1CollectedHeap* g1h = G1CollectedHeap::heap();
tonyp@2011:   assert(!_should_initiate_conc_mark ||
tonyp@2011:   ((_gc_cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) ||
tonyp@2011:    (_gc_cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)),
tonyp@2011:          "only a GC locker or a System.gc() induced GC should start a cycle");
tonyp@2011: 
ysr@1523:   GCCauseSetter x(g1h, _gc_cause);
tonyp@2011:   if (_should_initiate_conc_mark) {
tonyp@2011:     // It's safer to read full_collections_completed() here, given
tonyp@2011:     // that noone else will be updating it concurrently. Since we'll
tonyp@2011:     // only need it if we're initiating a marking cycle, no point in
tonyp@2011:     // setting it earlier.
tonyp@2011:     _full_collections_completed_before = g1h->full_collections_completed();
tonyp@2011: 
tonyp@2011:     // At this point we are supposed to start a concurrent cycle. We
tonyp@2011:     // will do so if one is not already in progress.
tonyp@2011:     bool res = g1h->g1_policy()->force_initial_mark_if_outside_cycle();
tonyp@2011:   }
tonyp@2011:   g1h->do_collection_pause_at_safepoint(_target_pause_time_ms);
tonyp@2011: }
tonyp@2011: 
tonyp@2011: void VM_G1IncCollectionPause::doit_epilogue() {
tonyp@2011:   VM_GC_Operation::doit_epilogue();
tonyp@2011: 
tonyp@2011:   // If the pause was initiated by a System.gc() and
tonyp@2011:   // +ExplicitGCInvokesConcurrent, we have to wait here for the cycle
tonyp@2011:   // that just started (or maybe one that was already in progress) to
tonyp@2011:   // finish.
tonyp@2011:   if (_gc_cause == GCCause::_java_lang_system_gc &&
tonyp@2011:       _should_initiate_conc_mark) {
tonyp@2011:     assert(ExplicitGCInvokesConcurrent,
tonyp@2011:            "the only way to be here is if ExplicitGCInvokesConcurrent is set");
tonyp@2011: 
tonyp@2011:     G1CollectedHeap* g1h = G1CollectedHeap::heap();
tonyp@2011: 
tonyp@2011:     // In the doit() method we saved g1h->full_collections_completed()
tonyp@2011:     // in the _full_collections_completed_before field. We have to
tonyp@2011:     // wait until we observe that g1h->full_collections_completed()
tonyp@2011:     // has increased by at least one. This can happen if a) we started
tonyp@2011:     // a cycle and it completes, b) a cycle already in progress
tonyp@2011:     // completes, or c) a Full GC happens.
tonyp@2011: 
tonyp@2011:     // If the condition has already been reached, there's no point in
tonyp@2011:     // actually taking the lock and doing the wait.
tonyp@2011:     if (g1h->full_collections_completed() <=
tonyp@2011:                                           _full_collections_completed_before) {
tonyp@2011:       // The following is largely copied from CMS
tonyp@2011: 
tonyp@2011:       Thread* thr = Thread::current();
tonyp@2011:       assert(thr->is_Java_thread(), "invariant");
tonyp@2011:       JavaThread* jt = (JavaThread*)thr;
tonyp@2011:       ThreadToNativeFromVM native(jt);
tonyp@2011: 
tonyp@2011:       MutexLockerEx x(FullGCCount_lock, Mutex::_no_safepoint_check_flag);
tonyp@2011:       while (g1h->full_collections_completed() <=
tonyp@2011:                                           _full_collections_completed_before) {
tonyp@2011:         FullGCCount_lock->wait(Mutex::_no_safepoint_check_flag);
tonyp@2011:       }
tonyp@2011:     }
tonyp@2011:   }
ysr@777: }
ysr@777: 
ysr@777: void VM_CGC_Operation::doit() {
ysr@777:   gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
ysr@777:   TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
ysr@777:   TraceTime t(_printGCMessage, PrintGC, true, gclog_or_tty);
ysr@777:   SharedHeap* sh = SharedHeap::heap();
ysr@777:   // This could go away if CollectedHeap gave access to _gc_is_active...
ysr@777:   if (sh != NULL) {
ysr@777:     IsGCActiveMark x;
ysr@777:     _cl->do_void();
ysr@777:   } else {
ysr@777:     _cl->do_void();
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: bool VM_CGC_Operation::doit_prologue() {
ysr@777:   Heap_lock->lock();
ysr@777:   SharedHeap::heap()->_thread_holds_heap_lock_for_gc = true;
ysr@777:   return true;
ysr@777: }
ysr@777: 
ysr@777: void VM_CGC_Operation::doit_epilogue() {
ysr@777:   SharedHeap::heap()->_thread_holds_heap_lock_for_gc = false;
ysr@777:   Heap_lock->unlock();
ysr@777: }