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src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp@05f89f00a864 (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp

Mon, 24 Aug 2009 10:36:31 -0700

author

jmasa

date

Mon, 24 Aug 2009 10:36:31 -0700

changeset 1370

05f89f00a864

parent 574

c0492d52d55b

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6798898: CMS: bugs related to class unloading
Summary: Override should_remember_klasses() and remember_klass() as needed.
Reviewed-by: ysr, jcoomes

duke@435	1	/*
duke@435	2	* Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
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
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	class CardTableRS; // fwd decl
duke@435	26	class ConcurrentMarkSweepGeneration;
duke@435	27
duke@435	28	// A PermGen implemented with a CMS space, collected by a CMS collector.
duke@435	29	class CMSPermGen: public PermGen {
duke@435	30	friend class VMStructs;
duke@435	31
duke@435	32	protected:
duke@435	33	// The "generation" view.
duke@435	34	ConcurrentMarkSweepGeneration* _gen;
duke@435	35
duke@435	36	public:
duke@435	37	CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
duke@435	38	CardTableRS* ct, FreeBlockDictionary::DictionaryChoice);
duke@435	39
duke@435	40	HeapWord* mem_allocate(size_t size);
duke@435	41
duke@435	42	void compute_new_size();
duke@435	43
duke@435	44	Generation* as_gen() const { return _gen; }
duke@435	45	};
duke@435	46
duke@435	47	// This is the "generation" view of a CMSPermGen.
duke@435	48	class CMSPermGenGen: public ConcurrentMarkSweepGeneration {
duke@435	49	// Abstractly, this is a subtype that gets access to protected fields.
duke@435	50	friend class CMSPermGen;
duke@435	51	public:
duke@435	52	CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size,
duke@435	53	int level, CardTableRS* ct):
duke@435	54	// See comments in the constructor for CompactibleFreeListSpace
duke@435	55	// regarding not using adaptive free lists for a perm gen.
duke@435	56	ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion
duke@435	57	level, ct, false /* use adaptive freelists */,
duke@435	58	(FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice)
duke@435	59	{}
duke@435	60
duke@435	61	void initialize_performance_counters();
duke@435	62
duke@435	63	const char* name() const {
duke@435	64	return "concurrent-mark-sweep perm gen";
duke@435	65	}
duke@435	66
duke@435	67	const char* short_name() const {
duke@435	68	return "CMS Perm";
duke@435	69	}
duke@435	70
duke@435	71	bool must_be_youngest() const { return false; }
duke@435	72	bool must_be_oldest() const { return false; }
duke@435	73	};