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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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20
hotspot/src/share/vm/memory/genRemSet.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2012, 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
@ -35,10 +35,22 @@ class BarrierSet;
class OopsInGenClosure;
class CardTableRS;
// Helper to remember modified oops in all klasses.
class KlassRemSet {
bool _accumulate_modified_oops;
public:
KlassRemSet() : _accumulate_modified_oops(false) {}
void set_accumulate_modified_oops(bool value) { _accumulate_modified_oops = value; }
bool accumulate_modified_oops() { return _accumulate_modified_oops; }
bool mod_union_is_clear();
void clear_mod_union();
};
class GenRemSet: public CHeapObj<mtGC> {
friend class Generation;
BarrierSet* _bs;
KlassRemSet _klass_rem_set;
public:
enum Name {
@ -62,6 +74,8 @@ public:
// Set the barrier set.
void set_bs(BarrierSet* bs) { _bs = bs; }
KlassRemSet* klass_rem_set() { return &_klass_rem_set; }
// Do any (sequential) processing necessary to prepare for (possibly
// "parallel", if that arg is true) calls to younger_refs_iterate.
virtual void prepare_for_younger_refs_iterate(bool parallel) = 0;
@ -121,7 +135,7 @@ public:
// younger than gen from generations gen and older.
// The parameter clear_perm indicates if the perm_gen's
// remembered set should also be processed/cleared.
virtual void clear_into_younger(Generation* gen, bool clear_perm) = 0;
virtual void clear_into_younger(Generation* gen) = 0;
// Informs the RS that refs in the given "mr" may have changed
// arbitrarily, and therefore may contain old-to-young pointers.
@ -136,7 +150,7 @@ public:
// younger indicates if the same should be done for younger generations
// as well. The parameter perm indicates if the same should be done for
// perm gen as well.
virtual void invalidate_or_clear(Generation* gen, bool younger, bool perm) = 0;
virtual void invalidate_or_clear(Generation* gen, bool younger) = 0;
};
#endif // SHARE_VM_MEMORY_GENREMSET_HPP