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8208677: Move inner metaspace cleaning out of class unloading

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Move to safepoint cleanup actions to do if needed.

Reviewed-by: eosterlund, hseigel
This commit is contained in:
Coleen Phillimore 2018-08-08 15:24:21 -04:00
parent 149026aa65
commit a7b66f6f5e
10 changed files with 94 additions and 31 deletions
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19
src/hotspot/share/classfile/classLoaderData.hpp
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@ -79,6 +79,12 @@ class ClassLoaderDataGraph : public AllStatic {
static ClassLoaderData* _saved_head;
static ClassLoaderData* _saved_unloading;
static bool _should_purge;
// Set if there's anything to purge in the deallocate lists or previous versions
// during a safepoint after class unloading in a full GC.
static bool _should_clean_deallocate_lists;
static bool _safepoint_cleanup_needed;
// OOM has been seen in metaspace allocation. Used to prevent some
// allocations until class unloading
static bool _metaspace_oom;
@ -88,6 +94,7 @@ class ClassLoaderDataGraph : public AllStatic {
static ClassLoaderData* add_to_graph(Handle class_loader, bool anonymous);
static ClassLoaderData* add(Handle class_loader, bool anonymous);
public:
static ClassLoaderData* find_or_create(Handle class_loader);
static void purge();
@ -116,7 +123,13 @@ class ClassLoaderDataGraph : public AllStatic {
static void packages_unloading_do(void f(PackageEntry*));
static void loaded_classes_do(KlassClosure* klass_closure);
static void classes_unloading_do(void f(Klass* const));
static bool do_unloading(bool clean_previous_versions);
static bool do_unloading(bool do_cleaning);
// Expose state to avoid logging overhead in safepoint cleanup tasks.
static inline bool should_clean_metaspaces_and_reset();
static void set_should_clean_deallocate_lists() { _should_clean_deallocate_lists = true; }
static void clean_deallocate_lists(bool purge_previous_versions);
static void walk_metadata_and_clean_metaspaces();
// dictionary do
// Iterate over all klasses in dictionary, but
@ -297,8 +310,8 @@ class ClassLoaderData : public CHeapObj<mtClass> {
void packages_do(void f(PackageEntry*));
// Deallocate free list during class unloading.
void free_deallocate_list(); // for the classes that are not unloaded
void unload_deallocate_list(); // for the classes that are unloaded
void free_deallocate_list(); // for the classes that are not unloaded
void free_deallocate_list_C_heap_structures(); // for the classes that are unloaded
// Allocate out of this class loader data
MetaWord* allocate(size_t size);