void StealMarkingTask::do_it(GCTaskManager* manager, uint which) {
assert(Universe::heap()->is_gc_active(), "called outside gc");
NOT_PRODUCT(GCTraceTime tm("StealMarkingTask",
PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
oop obj = NULL;
ObjArrayTask task;
int random_seed = 17;
do {
while (ParCompactionManager::steal_objarray(which, &random_seed, task)) {
objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
k->oop_follow_contents(cm, task.obj(), task.index());
cm->follow_marking_stacks();
}
while (ParCompactionManager::steal(which, &random_seed, obj)) {
obj->follow_contents(cm);
cm->follow_marking_stacks();
}
} while (!terminator()->offer_termination());
}
void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
assert(Universe::heap()->is_gc_active(), "called outside gc");
ResourceMark rm;
NOT_PRODUCT(TraceTime tm("ThreadRootsMarkingTask",
PrintGCDetails && TraceParallelOldGCTasks, true, gclog_or_tty));
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
CodeBlobToOopClosure mark_and_push_in_blobs(&mark_and_push_closure, /*do_marking=*/ true);
if (_java_thread != NULL)
_java_thread->oops_do(
&mark_and_push_closure,
&mark_and_push_from_clds,
&mark_and_push_in_blobs);
if (_vm_thread != NULL)
_vm_thread->oops_do(
&mark_and_push_closure,
&mark_and_push_from_clds,
&mark_and_push_in_blobs);
// Do the real work
cm->follow_marking_stacks();
}
PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
//
// ThreadRootsMarkingTask
//
void ThreadRootsMarkingTask::do_it(GCTaskManager* manager, uint which) {
assert(Universe::heap()->is_gc_active(), "called outside gc");
ResourceMark rm;
NOT_PRODUCT(GCTraceTime tm("ThreadRootsMarkingTask",
PrintGCDetails && TraceParallelOldGCTasks, true, NULL, PSParallelCompact::gc_tracer()->gc_id()));
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
CLDToOopClosure mark_and_push_from_clds(&mark_and_push_closure, true);
MarkingCodeBlobClosure mark_and_push_in_blobs(&mark_and_push_closure, !CodeBlobToOopClosure::FixRelocations);
if (_java_thread != NULL)
_java_thread->oops_do(
&mark_and_push_closure,
&mark_and_push_from_clds,
&mark_and_push_in_blobs);
if (_vm_thread != NULL)
_vm_thread->oops_do(
&mark_and_push_closure,
&mark_and_push_from_clds,
&mark_and_push_in_blobs);
// Do the real work
cm->follow_marking_stacks();
}
void MarkFromRootsTask::do_it(GCTaskManager* manager, uint which) {
assert(Universe::heap()->is_gc_active(), "called outside gc");
NOT_PRODUCT(GCTraceTime tm("MarkFromRootsTask",
PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
switch (_root_type) {
case universe:
Universe::oops_do(&mark_and_push_closure);
break;
case jni_handles:
JNIHandles::oops_do(&mark_and_push_closure);
break;
case threads:
{
ResourceMark rm;
CodeBlobToOopClosure each_active_code_blob(&mark_and_push_closure, /*do_marking=*/ true);
Threads::oops_do(&mark_and_push_closure, &each_active_code_blob);
}
break;
case object_synchronizer:
ObjectSynchronizer::oops_do(&mark_and_push_closure);
break;
case flat_profiler:
FlatProfiler::oops_do(&mark_and_push_closure);
break;
case management:
Management::oops_do(&mark_and_push_closure);
break;
case jvmti:
JvmtiExport::oops_do(&mark_and_push_closure);
break;
case system_dictionary:
SystemDictionary::always_strong_oops_do(&mark_and_push_closure);
break;
case code_cache:
// Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
//CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(&mark_and_push_closure));
break;
default:
fatal("Unknown root type");
}
// Do the real work
cm->follow_marking_stacks();
}
void PSMarkSweep::mark_sweep_phase1( bool& marked_for_unloading, bool clear_all_softrefs) {
// Recursively traverse all live objects and mark them
EventMark m("1 mark object");
TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty);
trace(" 1");
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
// General strong roots.
Universe::oops_do(mark_and_push_closure());
JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
Threads::oops_do(mark_and_push_closure());
ObjectSynchronizer::oops_do(mark_and_push_closure());
FlatProfiler::oops_do(mark_and_push_closure());
SystemDictionary::always_strong_oops_do(mark_and_push_closure());
guarantee(!jvmdi::enabled(), "Should not be used with jvmdi");
vmSymbols::oops_do(mark_and_push_closure());
// Flush marking stack.
follow_stack();
// Process reference objects found during marking
ReferencePolicy *soft_ref_policy;
if (clear_all_softrefs) {
soft_ref_policy = new AlwaysClearPolicy();
} else {
NOT_COMPILER2(soft_ref_policy = new LRUCurrentHeapPolicy();)
COMPILER2_ONLY(soft_ref_policy = new LRUMaxHeapPolicy();)
}
void RefProcTaskProxy::do_it(GCTaskManager* manager, uint which)
{
assert(Universe::heap()->is_gc_active(), "called outside gc");
NOT_PRODUCT(GCTraceTime tm("RefProcTask",
PrintGCDetails && TraceParallelOldGCTasks, true, NULL));
ParCompactionManager* cm =
ParCompactionManager::gc_thread_compaction_manager(which);
PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
PSParallelCompact::FollowStackClosure follow_stack_closure(cm);
_rp_task.work(_work_id, *PSParallelCompact::is_alive_closure(),
mark_and_push_closure, follow_stack_closure);
}
void instanceKlassKlass::oop_follow_contents(ParCompactionManager* cm,
oop obj) {
assert(obj->is_klass(),"must be a klass");
assert(klassOop(obj)->klass_part()->oop_is_instance_slow(), "must be instance klass");
instanceKlass* ik = instanceKlass::cast(klassOop(obj));
ik->follow_static_fields(cm);
ik->vtable()->oop_follow_contents(cm);
ik->itable()->oop_follow_contents(cm);
PSParallelCompact::mark_and_push(cm, ik->adr_array_klasses());
PSParallelCompact::mark_and_push(cm, ik->adr_methods());
PSParallelCompact::mark_and_push(cm, ik->adr_method_ordering());
PSParallelCompact::mark_and_push(cm, ik->adr_local_interfaces());
PSParallelCompact::mark_and_push(cm, ik->adr_transitive_interfaces());
PSParallelCompact::mark_and_push(cm, ik->adr_fields());
PSParallelCompact::mark_and_push(cm, ik->adr_constants());
PSParallelCompact::mark_and_push(cm, ik->adr_class_loader());
PSParallelCompact::mark_and_push(cm, ik->adr_source_file_name());
PSParallelCompact::mark_and_push(cm, ik->adr_source_debug_extension());
PSParallelCompact::mark_and_push(cm, ik->adr_inner_classes());
PSParallelCompact::mark_and_push(cm, ik->adr_protection_domain());
PSParallelCompact::mark_and_push(cm, ik->adr_host_klass());
PSParallelCompact::mark_and_push(cm, ik->adr_signers());
PSParallelCompact::mark_and_push(cm, ik->adr_generic_signature());
PSParallelCompact::mark_and_push(cm, ik->adr_bootstrap_method());
PSParallelCompact::mark_and_push(cm, ik->adr_class_annotations());
PSParallelCompact::mark_and_push(cm, ik->adr_fields_annotations());
PSParallelCompact::mark_and_push(cm, ik->adr_methods_annotations());
PSParallelCompact::mark_and_push(cm, ik->adr_methods_parameter_annotations());
PSParallelCompact::mark_and_push(cm, ik->adr_methods_default_annotations());
// We do not follow adr_implementor() here. It is followed later
// in instanceKlass::follow_weak_klass_links()
klassKlass::oop_follow_contents(cm, obj);
PSParallelCompact::MarkAndPushClosure mark_and_push_closure(cm);
iterate_c_heap_oops(ik, &mark_and_push_closure);
}
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
// Recursively traverse all live objects and mark them
EventMark m("1 mark object");
TraceTime tm("phase 1", PrintGCDetails && Verbose, true, gclog_or_tty);
trace(" 1");
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
// General strong roots.
{
ParallelScavengeHeap::ParStrongRootsScope psrs;
Universe::oops_do(mark_and_push_closure());
ReferenceProcessor::oops_do(mark_and_push_closure());
JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
CodeBlobToOopClosure each_active_code_blob(mark_and_push_closure(), /*do_marking=*/ true);
Threads::oops_do(mark_and_push_closure(), &each_active_code_blob);
ObjectSynchronizer::oops_do(mark_and_push_closure());
FlatProfiler::oops_do(mark_and_push_closure());
Management::oops_do(mark_and_push_closure());
JvmtiExport::oops_do(mark_and_push_closure());
SystemDictionary::always_strong_oops_do(mark_and_push_closure());
vmSymbols::oops_do(mark_and_push_closure());
// Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
//CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure()));
}
// Flush marking stack.
follow_stack();
// Process reference objects found during marking
{
ref_processor()->setup_policy(clear_all_softrefs);
ref_processor()->process_discovered_references(
is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL);
}
// Follow system dictionary roots and unload classes
bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
// Follow code cache roots
CodeCache::do_unloading(is_alive_closure(), mark_and_push_closure(),
purged_class);
follow_stack(); // Flush marking stack
// Update subklass/sibling/implementor links of live klasses
follow_weak_klass_links();
assert(_marking_stack.is_empty(), "just drained");
// Visit memoized mdo's and clear unmarked weak refs
follow_mdo_weak_refs();
assert(_marking_stack.is_empty(), "just drained");
// Visit symbol and interned string tables and delete unmarked oops
SymbolTable::unlink(is_alive_closure());
StringTable::unlink(is_alive_closure());
assert(_marking_stack.is_empty(), "stack should be empty by now");
}
inline void ParCompactionManager::follow_class_loader(ClassLoaderData* cld) {
MarkAndPushClosure mark_and_push_closure(this);
FollowKlassClosure follow_klass_closure(&mark_and_push_closure);
cld->oops_do(&mark_and_push_closure, &follow_klass_closure, true);
}
void PSMarkSweep::mark_sweep_phase1(bool clear_all_softrefs) {
// Recursively traverse all live objects and mark them
GCTraceTime tm("phase 1", PrintGCDetails && Verbose, true, _gc_timer, _gc_tracer->gc_id());
ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
// Need to clear claim bits before the tracing starts.
ClassLoaderDataGraph::clear_claimed_marks();
// General strong roots.
{
ParallelScavengeHeap::ParStrongRootsScope psrs;
Universe::oops_do(mark_and_push_closure());
JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
CLDToOopClosure mark_and_push_from_cld(mark_and_push_closure());
MarkingCodeBlobClosure each_active_code_blob(mark_and_push_closure(), !CodeBlobToOopClosure::FixRelocations);
Threads::oops_do(mark_and_push_closure(), &mark_and_push_from_cld, &each_active_code_blob);
ObjectSynchronizer::oops_do(mark_and_push_closure());
FlatProfiler::oops_do(mark_and_push_closure());
Management::oops_do(mark_and_push_closure());
JvmtiExport::oops_do(mark_and_push_closure());
SystemDictionary::always_strong_oops_do(mark_and_push_closure());
ClassLoaderDataGraph::always_strong_cld_do(follow_cld_closure());
// Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
//CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure()));
}
// Flush marking stack.
follow_stack();
// Process reference objects found during marking
{
ref_processor()->setup_policy(clear_all_softrefs);
const ReferenceProcessorStats& stats =
ref_processor()->process_discovered_references(
is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer, _gc_tracer->gc_id());
gc_tracer()->report_gc_reference_stats(stats);
}
// This is the point where the entire marking should have completed.
assert(_marking_stack.is_empty(), "Marking should have completed");
// Unload classes and purge the SystemDictionary.
bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
// Unload nmethods.
CodeCache::do_unloading(is_alive_closure(), purged_class);
// Prune dead klasses from subklass/sibling/implementor lists.
Klass::clean_weak_klass_links(is_alive_closure());
// Delete entries for dead interned strings.
StringTable::unlink(is_alive_closure());
// Clean up unreferenced symbols in symbol table.
SymbolTable::unlink();
_gc_tracer->report_object_count_after_gc(is_alive_closure());
}
