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6964458: Reimplement class meta-data storage to use native memory

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Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes

Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com>
Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com>
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
This commit is contained in:
Jon Masamitsu 2012-09-01 13:25:18 -04:00 • committed by Coleen Phillimore
parent 36eee7c8c8
commit 5c58d27aac
853 changed files with 26124 additions and 82956 deletions
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40
hotspot/src/share/vm/gc_interface/collectedHeap.cpp
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@ -114,6 +114,38 @@ CollectedHeap::CollectedHeap() : _n_par_threads(0)
}
}
// This interface assumes that it's being called by the
// vm thread. It collects the heap assuming that the
// heap lock is already held and that we are executing in
// the context of the vm thread.
void CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) {
assert(Thread::current()->is_VM_thread(), "Precondition#1");
assert(Heap_lock->is_locked(), "Precondition#2");
GCCauseSetter gcs(this, cause);
switch (cause) {
case GCCause::_heap_inspection:
case GCCause::_heap_dump:
case GCCause::_metadata_GC_threshold : {
HandleMark hm;
do_full_collection(false); // don't clear all soft refs
break;
}
case GCCause::_last_ditch_collection: {
HandleMark hm;
do_full_collection(true); // do clear all soft refs
break;
}
default:
ShouldNotReachHere(); // Unexpected use of this function
}
}
MetaWord* CollectedHeap::satisfy_failed_metadata_allocation(
ClassLoaderData* loader_data,
size_t size, Metaspace::MetadataType mdtype) {
return collector_policy()->satisfy_failed_metadata_allocation(loader_data, size, mdtype);
}
void CollectedHeap::pre_initialize() {
// Used for ReduceInitialCardMarks (when COMPILER2 is used);
// otherwise remains unused.
@ -215,9 +247,7 @@ void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) {
assert(is_in(old_obj), "Not in allocated heap");
assert(!can_elide_initializing_store_barrier(old_obj),
"Else should have been filtered in new_store_pre_barrier()");
assert(!is_in_permanent(old_obj), "Sanity: not expected");
assert(old_obj->is_oop(true), "Not an oop");
assert(old_obj->is_parsable(), "Will not be concurrently parsable");
assert(deferred.word_size() == (size_t)(old_obj->size()),
"Mismatch: multiple objects?");
}
@ -470,15 +500,11 @@ oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle r
assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed");
assert(size >= 0, "int won't convert to size_t");
HeapWord* obj;
if (JavaObjectsInPerm) {
obj = common_permanent_mem_allocate_init(size, CHECK_NULL);
} else {
assert(ScavengeRootsInCode > 0, "must be");
obj = common_mem_allocate_init(size, CHECK_NULL);
}
post_allocation_setup_common(klass, obj);
assert(Universe::is_bootstrapping() ||
!((oop)obj)->blueprint()->oop_is_array(), "must not be an array");
!((oop)obj)->is_array(), "must not be an array");
NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size));
oop mirror = (oop)obj;