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8061205: MetadataOnStackMark only needs to walk code cache during class redefinition

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Only do full metadata walk during class redefinition and only walk handles during class unloading.

Reviewed-by: sspitsyn, stefank
This commit is contained in:
Coleen Phillimore 2015-03-13 12:40:39 -04:00
parent 984cf4c9b5
commit 7b384c6958
19 changed files with 147 additions and 248 deletions
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18
hotspot/src/share/vm/classfile/metadataOnStackMark.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -36,23 +36,23 @@ typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
// or executing methods, so that it can't be deleted during class redefinition
// and class unloading.
// This is also used for other things that can be deallocated, like class
// metadata during parsing, relocated methods, and methods in backtraces.
// metadata during parsing if errors occur, relocated methods, and temporary
// constant pools.
class MetadataOnStackMark : public StackObj {
NOT_PRODUCT(static bool _is_active;)
static volatile MetadataOnStackBuffer* _used_buffers;
static volatile MetadataOnStackBuffer* _free_buffers;
static MetadataOnStackBuffer* _used_buffers;
static MetadataOnStackBuffer* _free_buffers;
static MetadataOnStackBuffer* _current_buffer;
static MetadataOnStackBuffer* allocate_buffer();
static void retire_buffer(MetadataOnStackBuffer* buffer);
public:
MetadataOnStackMark(bool visit_code_cache);
MetadataOnStackMark(bool redefinition_walk);
~MetadataOnStackMark();
static void record(Metadata* m, Thread* thread);
static void retire_buffer_for_thread(Thread* thread);
static bool has_buffer_for_thread(Thread* thread);
static void record(Metadata* m);
static void retire_current_buffer();
};
#endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP