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src/share/vm/memory/permGen.hpp@e41cd7fd68a6 (annotated)

src/share/vm/memory/permGen.hpp

Fri, 01 Oct 2010 16:12:54 -0700

author

ysr

date

Fri, 01 Oct 2010 16:12:54 -0700

changeset 2194

e41cd7fd68a6

parent 1907

c18cbe5936b8

child 2314

f95d63e2154a

permissions

-rw-r--r--

6794422: Perm gen expansion policy for concurrent collectors
Summary: 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

duke@435	1	/*
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duke@435	5	* This code is free software; you can redistribute it and/or modify it
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duke@435	7	* published by the Free Software Foundation.
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duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
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trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// All heaps contains a "permanent generation," containing permanent
duke@435	26	// (reflective) objects. This is like a regular generation in some ways,
duke@435	27	// but unlike one in others, and so is split apart.
duke@435	28
duke@435	29	class Generation;
duke@435	30	class GenRemSet;
duke@435	31	class CSpaceCounters;
duke@435	32
ysr@2194	33	// PermGen models the part of the heap used to allocate class meta-data.
duke@435	34
duke@435	35	class PermGen : public CHeapObj {
duke@435	36	friend class VMStructs;
duke@435	37	protected:
duke@435	38	size_t _capacity_expansion_limit; // maximum expansion allowed without a
twisti@1040	39	// full gc occurring
ysr@2194	40	void set_capacity_expansion_limit(size_t limit) {
ysr@2194	41	assert_locked_or_safepoint(Heap_lock);
ysr@2194	42	_capacity_expansion_limit = limit;
ysr@2194	43	}
duke@435	44
apetrusenko@574	45	HeapWord* mem_allocate_in_gen(size_t size, Generation* gen);
ysr@2194	46	// Along with mem_allocate_in_gen() above, implements policy for
ysr@2194	47	// "scheduling" allocation/expansion/collection of the perm gen.
ysr@2194	48	// The virtual method request_...() below can be overridden by
ysr@2194	49	// subtypes that want to implement a different expansion/collection
ysr@2194	50	// policy from the default provided.
ysr@2194	51	virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,
ysr@2194	52	GCCause::Cause prev_cause);
apetrusenko@574	53
duke@435	54	public:
duke@435	55	enum Name {
duke@435	56	MarkSweepCompact, MarkSweep, ConcurrentMarkSweep
duke@435	57	};
duke@435	58
duke@435	59	// Permanent allocation (initialized)
duke@435	60	virtual HeapWord* mem_allocate(size_t size) = 0;
duke@435	61
duke@435	62	// Mark sweep support
duke@435	63	virtual void compute_new_size() = 0;
duke@435	64
duke@435	65	// Ideally, we would use MI (IMHO) but we'll do delegation instead.
duke@435	66	virtual Generation* as_gen() const = 0;
duke@435	67
duke@435	68	virtual void oop_iterate(OopClosure* cl) {
duke@435	69	Generation* g = as_gen();
duke@435	70	assert(g != NULL, "as_gen() NULL");
duke@435	71	g->oop_iterate(cl);
duke@435	72	}
duke@435	73
duke@435	74	virtual void object_iterate(ObjectClosure* cl) {
duke@435	75	Generation* g = as_gen();
duke@435	76	assert(g != NULL, "as_gen() NULL");
duke@435	77	g->object_iterate(cl);
duke@435	78	}
duke@435	79
duke@435	80	// Performance Counter support
duke@435	81	virtual void update_counters() {
duke@435	82	Generation* g = as_gen();
duke@435	83	assert(g != NULL, "as_gen() NULL");
duke@435	84	g->update_counters();
duke@435	85	}
duke@435	86	};