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8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse

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Reviewed-by: mgerdin, coleenp, bdelsart
This commit is contained in:
Stefan Karlsson 2014-10-02 10:55:36 +02:00
parent 1055ae0436
commit d410f19961
19 changed files with 506 additions and 68 deletions
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19
hotspot/src/share/vm/classfile/metadataOnStackMark.hpp
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@ -26,9 +26,12 @@
#define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
#include "memory/allocation.hpp"
#include "utilities/chunkedList.hpp"
class Metadata;
typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
// Helper class to mark and unmark metadata used on the stack as either handles
// or executing methods, so that it can't be deleted during class redefinition
// and class unloading.
@ -36,10 +39,20 @@ class Metadata;
// metadata during parsing, relocated methods, and methods in backtraces.
class MetadataOnStackMark : public StackObj {
NOT_PRODUCT(static bool _is_active;)
static volatile MetadataOnStackBuffer* _used_buffers;
static volatile MetadataOnStackBuffer* _free_buffers;
static MetadataOnStackBuffer* allocate_buffer();
static void retire_buffer(MetadataOnStackBuffer* buffer);
public:
MetadataOnStackMark(bool has_redefined_a_class);
~MetadataOnStackMark();
static void record(Metadata* m);
MetadataOnStackMark(bool visit_code_cache);
~MetadataOnStackMark();
static void record(Metadata* m, Thread* thread);
static void retire_buffer_for_thread(Thread* thread);
static bool has_buffer_for_thread(Thread* thread);
};
#endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP