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6794422: Perm gen expansion policy for concurrent collectors

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Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.

Reviewed-by: johnc
This commit is contained in:
Y. Srinivas Ramakrishna 2010-10-01 16:12:54 -07:00
parent 603e50f355
commit 8fbdf5c7f0
5 changed files with 52 additions and 9 deletions
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15
hotspot/src/share/vm/memory/permGen.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2010, 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
@ -30,15 +30,26 @@ class Generation;
class GenRemSet;
class CSpaceCounters;
// PermGen models the part of the heap
// PermGen models the part of the heap used to allocate class meta-data.
class PermGen : public CHeapObj {
friend class VMStructs;
protected:
size_t _capacity_expansion_limit; // maximum expansion allowed without a
// full gc occurring
void set_capacity_expansion_limit(size_t limit) {
assert_locked_or_safepoint(Heap_lock);
_capacity_expansion_limit = limit;
}
HeapWord* mem_allocate_in_gen(size_t size, Generation* gen);
// Along with mem_allocate_in_gen() above, implements policy for
// "scheduling" allocation/expansion/collection of the perm gen.
// The virtual method request_...() below can be overridden by
// subtypes that want to implement a different expansion/collection
// policy from the default provided.
virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,
GCCause::Cause prev_cause);
public:
enum Name {