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src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp@8b46c4d82093 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.hpp

Wed, 02 Sep 2009 00:04:29 -0700

author

ysr

date

Wed, 02 Sep 2009 00:04:29 -0700

changeset 1376

8b46c4d82093

parent 905

ad8c8ca4ab0f

child 1383

89e0543e1737

permissions

-rw-r--r--

4957990: Perm heap bloat in JVM
Summary: Treat ProfileData in MDO's as a source of weak, not strong, roots. Fixes the bug for stop-world collection -- the case of concurrent collection will be fixed separately.
Reviewed-by: jcoomes, jmasa, kvn, never

duke@435	1	/*
xdono@905	2	* Copyright 2005-2008 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	//
duke@435	26	// psPromotionManager is used by a single thread to manage object survival
duke@435	27	// during a scavenge. The promotion manager contains thread local data only.
duke@435	28	//
duke@435	29	// NOTE! Be carefull when allocating the stacks on cheap. If you are going
duke@435	30	// to use a promotion manager in more than one thread, the stacks MUST be
duke@435	31	// on cheap. This can lead to memory leaks, though, as they are not auto
duke@435	32	// deallocated.
duke@435	33	//
duke@435	34	// FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate!
duke@435	35	//
duke@435	36
duke@435	37	// Move to some global location
duke@435	38	#define HAS_BEEN_MOVED 0x1501d01d
duke@435	39	// End move to some global location
duke@435	40
duke@435	41
duke@435	42	class MutableSpace;
duke@435	43	class PSOldGen;
duke@435	44	class ParCompactionManager;
duke@435	45	class ObjectStartArray;
duke@435	46	class ParallelCompactData;
duke@435	47	class ParMarkBitMap;
duke@435	48
duke@435	49	// Move to it's own file if this works out.
duke@435	50
duke@435	51	class ParCompactionManager : public CHeapObj {
duke@435	52	friend class ParallelTaskTerminator;
duke@435	53	friend class ParMarkBitMap;
duke@435	54	friend class PSParallelCompact;
jcoomes@810	55	friend class StealRegionCompactionTask;
duke@435	56	friend class UpdateAndFillClosure;
duke@435	57	friend class RefProcTaskExecutor;
duke@435	58
duke@435	59	public:
duke@435	60
duke@435	61	// ------------------------ Don't putback if not needed
duke@435	62	// Actions that the compaction manager should take.
duke@435	63	enum Action {
duke@435	64	Update,
duke@435	65	Copy,
duke@435	66	UpdateAndCopy,
duke@435	67	CopyAndUpdate,
duke@435	68	VerifyUpdate,
duke@435	69	ResetObjects,
duke@435	70	NotValid
duke@435	71	};
duke@435	72	// ------------------------ End don't putback if not needed
duke@435	73
duke@435	74	private:
jcoomes@810	75	static ParCompactionManager** _manager_array;
jcoomes@810	76	static OopTaskQueueSet* _stack_array;
jcoomes@810	77	static ObjectStartArray* _start_array;
jcoomes@810	78	static RegionTaskQueueSet* _region_array;
jcoomes@810	79	static PSOldGen* _old_gen;
duke@435	80
jcoomes@810	81	OopTaskQueue _marking_stack;
jcoomes@810	82	GrowableArray<oop>* _overflow_stack;
duke@435	83	// Is there a way to reuse the _marking_stack for the
jcoomes@810	84	// saving empty regions? For now just create a different
duke@435	85	// type of TaskQueue.
duke@435	86
jcoomes@810	87	#ifdef USE_RegionTaskQueueWithOverflow
jcoomes@810	88	RegionTaskQueueWithOverflow _region_stack;
duke@435	89	#else
jcoomes@810	90	RegionTaskQueue _region_stack;
jcoomes@810	91	GrowableArray<size_t>* _region_overflow_stack;
duke@435	92	#endif
duke@435	93
duke@435	94	#if 1 // does this happen enough to need a per thread stack?
jcoomes@810	95	GrowableArray<Klass*>* _revisit_klass_stack;
ysr@1376	96	GrowableArray<DataLayout*>* _revisit_mdo_stack;
duke@435	97	#endif
duke@435	98	static ParMarkBitMap* _mark_bitmap;
duke@435	99
duke@435	100	Action _action;
duke@435	101
duke@435	102	static PSOldGen* old_gen() { return _old_gen; }
duke@435	103	static ObjectStartArray* start_array() { return _start_array; }
jcoomes@810	104	static OopTaskQueueSet* stack_array() { return _stack_array; }
duke@435	105
duke@435	106	static void initialize(ParMarkBitMap* mbm);
duke@435	107
duke@435	108	protected:
duke@435	109	// Array of tasks. Needed by the ParallelTaskTerminator.
jcoomes@810	110	static RegionTaskQueueSet* region_array() { return _region_array; }
jcoomes@810	111	OopTaskQueue* marking_stack() { return &_marking_stack; }
jcoomes@810	112	GrowableArray<oop>* overflow_stack() { return _overflow_stack; }
jcoomes@810	113	#ifdef USE_RegionTaskQueueWithOverflow
jcoomes@810	114	RegionTaskQueueWithOverflow* region_stack() { return &_region_stack; }
duke@435	115	#else
jcoomes@810	116	RegionTaskQueue* region_stack() { return &_region_stack; }
jcoomes@810	117	GrowableArray<size_t>* region_overflow_stack() {
jcoomes@810	118	return _region_overflow_stack;
jcoomes@810	119	}
duke@435	120	#endif
duke@435	121
duke@435	122	// Pushes onto the marking stack. If the marking stack is full,
duke@435	123	// pushes onto the overflow stack.
duke@435	124	void stack_push(oop obj);
duke@435	125	// Do not implement an equivalent stack_pop. Deal with the
duke@435	126	// marking stack and overflow stack directly.
duke@435	127
jcoomes@810	128	// Pushes onto the region stack. If the region stack is full,
jcoomes@810	129	// pushes onto the region overflow stack.
jcoomes@810	130	void region_stack_push(size_t region_index);
duke@435	131	public:
duke@435	132
duke@435	133	Action action() { return _action; }
duke@435	134	void set_action(Action v) { _action = v; }
duke@435	135
duke@435	136	inline static ParCompactionManager* manager_array(int index);
duke@435	137
duke@435	138	ParCompactionManager();
duke@435	139	~ParCompactionManager();
duke@435	140
duke@435	141	void allocate_stacks();
duke@435	142	void deallocate_stacks();
duke@435	143	ParMarkBitMap* mark_bitmap() { return _mark_bitmap; }
duke@435	144
duke@435	145	// Take actions in preparation for a compaction.
duke@435	146	static void reset();
duke@435	147
duke@435	148	// void drain_stacks();
duke@435	149
duke@435	150	bool should_update();
duke@435	151	bool should_copy();
duke@435	152	bool should_verify_only();
duke@435	153	bool should_reset_only();
duke@435	154
duke@435	155	#if 1
duke@435	156	// Probably stays as a growable array
duke@435	157	GrowableArray<Klass*>* revisit_klass_stack() { return _revisit_klass_stack; }
ysr@1376	158	GrowableArray<DataLayout*>* revisit_mdo_stack() { return _revisit_mdo_stack; }
duke@435	159	#endif
duke@435	160
duke@435	161	// Save oop for later processing. Must not fail.
duke@435	162	void save_for_scanning(oop m);
duke@435	163	// Get a oop for scanning. If returns null, no oop were found.
duke@435	164	oop retrieve_for_scanning();
duke@435	165
jcoomes@810	166	// Save region for later processing. Must not fail.
jcoomes@810	167	void save_for_processing(size_t region_index);
jcoomes@810	168	// Get a region for processing. If returns null, no region were found.
jcoomes@810	169	bool retrieve_for_processing(size_t& region_index);
duke@435	170
duke@435	171	// Access function for compaction managers
duke@435	172	static ParCompactionManager* gc_thread_compaction_manager(int index);
duke@435	173
duke@435	174	static bool steal(int queue_num, int* seed, Task& t) {
duke@435	175	return stack_array()->steal(queue_num, seed, t);
duke@435	176	}
duke@435	177
jcoomes@810	178	static bool steal(int queue_num, int* seed, RegionTask& t) {
jcoomes@810	179	return region_array()->steal(queue_num, seed, t);
duke@435	180	}
duke@435	181
duke@435	182	// Process tasks remaining on any stack
duke@435	183	void drain_marking_stacks(OopClosure *blk);
duke@435	184
duke@435	185	// Process tasks remaining on any stack
jcoomes@810	186	void drain_region_stacks();
duke@435	187
duke@435	188	// Process tasks remaining on any stack
jcoomes@810	189	void drain_region_overflow_stack();
duke@435	190
duke@435	191	// Debugging support
duke@435	192	#ifdef ASSERT
duke@435	193	bool stacks_have_been_allocated();
duke@435	194	#endif
duke@435	195	};
duke@435	196
duke@435	197	inline ParCompactionManager* ParCompactionManager::manager_array(int index) {
duke@435	198	assert(_manager_array != NULL, "access of NULL manager_array");
duke@435	199	assert(index >= 0 && index <= (int)ParallelGCThreads,
duke@435	200	"out of range manager_array access");
duke@435	201	return _manager_array[index];
duke@435	202	}