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src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp@001ec9515f84 (annotated)

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

Fri, 17 May 2013 11:57:05 +0200

author

ehelin

date

Fri, 17 May 2013 11:57:05 +0200

changeset 5159

001ec9515f84

parent 4129

22b8d3d181d9

child 5202

47bdfb3d010f

permissions

-rw-r--r--

8014277: Remove ObjectClosure as base class for BoolObjectClosure
Reviewed-by: brutisso, tschatzl

duke@435	1	/*
iveresov@3536	2	* Copyright (c) 2002, 2012, Oracle and/or its affiliates. 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	*
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
stefank@2314	25	#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP
stefank@2314	27
stefank@2314	28	#include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
stefank@2314	29	#include "gc_implementation/parallelScavenge/psVirtualspace.hpp"
stefank@2314	30	#include "gc_implementation/shared/collectorCounters.hpp"
stefank@2314	31	#include "memory/allocation.hpp"
stefank@2314	32	#include "oops/oop.hpp"
stefank@2314	33	#include "utilities/stack.hpp"
stefank@2314	34
duke@435	35	class GCTaskManager;
duke@435	36	class GCTaskQueue;
duke@435	37	class OopStack;
duke@435	38	class ReferenceProcessor;
duke@435	39	class ParallelScavengeHeap;
duke@435	40	class PSIsAliveClosure;
duke@435	41	class PSRefProcTaskExecutor;
duke@435	42
duke@435	43	class PSScavenge: AllStatic {
duke@435	44	friend class PSIsAliveClosure;
duke@435	45	friend class PSKeepAliveClosure;
duke@435	46	friend class PSPromotionManager;
duke@435	47
duke@435	48	enum ScavengeSkippedCause {
duke@435	49	not_skipped = 0,
duke@435	50	to_space_not_empty,
duke@435	51	promoted_too_large,
duke@435	52	full_follows_scavenge
duke@435	53	};
duke@435	54
duke@435	55	// Saved value of to_space->top(), used to prevent objects in to_space from
duke@435	56	// being rescanned.
duke@435	57	static HeapWord* _to_space_top_before_gc;
duke@435	58
duke@435	59	// Number of consecutive attempts to scavenge that were skipped
duke@435	60	static int _consecutive_skipped_scavenges;
duke@435	61
duke@435	62
duke@435	63	protected:
duke@435	64	// Flags/counters
duke@435	65	static ReferenceProcessor* _ref_processor; // Reference processor for scavenging.
duke@435	66	static PSIsAliveClosure _is_alive_closure; // Closure used for reference processing
duke@435	67	static CardTableExtension* _card_table; // We cache the card table for fast access.
duke@435	68	static bool _survivor_overflow; // Overflow this collection
jwilhelm@4129	69	static uint _tenuring_threshold; // tenuring threshold for next scavenge
duke@435	70	static elapsedTimer _accumulated_time; // total time spent on scavenge
duke@435	71	static HeapWord* _young_generation_boundary; // The lowest address possible for the young_gen.
duke@435	72	// This is used to decide if an oop should be scavenged,
duke@435	73	// cards should be marked, etc.
zgu@3900	74	static Stack<markOop, mtGC> _preserved_mark_stack; // List of marks to be restored after failed promotion
zgu@3900	75	static Stack<oop, mtGC> _preserved_oop_stack; // List of oops that need their mark restored.
jwilhelm@4129	76	static CollectorCounters* _counters; // collector performance counters
jcoomes@2191	77	static bool _promotion_failed;
duke@435	78
duke@435	79	static void clean_up_failed_promotion();
duke@435	80
duke@435	81	static bool should_attempt_scavenge();
duke@435	82
duke@435	83	static HeapWord* to_space_top_before_gc() { return _to_space_top_before_gc; }
duke@435	84	static inline void save_to_space_top_before_gc();
duke@435	85
duke@435	86	// Private accessors
duke@435	87	static CardTableExtension* const card_table() { assert(_card_table != NULL, "Sanity"); return _card_table; }
duke@435	88
duke@435	89	public:
duke@435	90	// Accessors
jwilhelm@4129	91	static uint tenuring_threshold() { return _tenuring_threshold; }
duke@435	92	static elapsedTimer* accumulated_time() { return &_accumulated_time; }
jcoomes@2191	93	static bool promotion_failed() { return _promotion_failed; }
duke@435	94	static int consecutive_skipped_scavenges()
duke@435	95	{ return _consecutive_skipped_scavenges; }
duke@435	96
duke@435	97	// Performance Counters
duke@435	98	static CollectorCounters* counters() { return _counters; }
duke@435	99
duke@435	100	// Used by scavenge_contents && psMarkSweep
duke@435	101	static ReferenceProcessor* const reference_processor() {
duke@435	102	assert(_ref_processor != NULL, "Sanity");
duke@435	103	return _ref_processor;
duke@435	104	}
duke@435	105	// Used to add tasks
duke@435	106	static GCTaskManager* const gc_task_manager();
duke@435	107	// The promotion managers tell us if they encountered overflow
duke@435	108	static void set_survivor_overflow(bool state) {
duke@435	109	_survivor_overflow = state;
duke@435	110	}
duke@435	111	// Adaptive size policy support. When the young generation/old generation
duke@435	112	// boundary moves, _young_generation_boundary must be reset
duke@435	113	static void set_young_generation_boundary(HeapWord* v) {
duke@435	114	_young_generation_boundary = v;
duke@435	115	}
duke@435	116
duke@435	117	// Called by parallelScavengeHeap to init the tenuring threshold
duke@435	118	static void initialize();
duke@435	119
jcoomes@3540	120	// Scavenge entry point. This may invoke a full gc; return true if so.
jcoomes@3540	121	static bool invoke();
jcoomes@3540	122	// Return true if a collection was done; false otherwise.
duke@435	123	static bool invoke_no_policy();
duke@435	124
duke@435	125	// If an attempt to promote fails, this method is invoked
duke@435	126	static void oop_promotion_failed(oop obj, markOop obj_mark);
duke@435	127
coleenp@548	128	template <class T> static inline bool should_scavenge(T* p);
duke@435	129
duke@435	130	// These call should_scavenge() above and, if it returns true, also check that
duke@435	131	// the object was not newly copied into to_space. The version with the bool
duke@435	132	// argument is a convenience wrapper that fetches the to_space pointer from
duke@435	133	// the heap and calls the other version (if the arg is true).
coleenp@548	134	template <class T> static inline bool should_scavenge(T* p, MutableSpace* to_space);
coleenp@548	135	template <class T> static inline bool should_scavenge(T* p, bool check_to_space);
duke@435	136
iveresov@3536	137	template <class T, bool promote_immediately>
iveresov@3536	138	inline static void copy_and_push_safe_barrier(PSPromotionManager* pm, T* p);
duke@435	139
coleenp@4037	140	static void copy_and_push_safe_barrier_from_klass(PSPromotionManager* pm, oop* p);
coleenp@4037	141
duke@435	142	// Is an object in the young generation
duke@435	143	// This assumes that the HeapWord argument is in the heap,
duke@435	144	// so it only checks one side of the complete predicate.
duke@435	145	inline static bool is_obj_in_young(HeapWord* o) {
duke@435	146	const bool result = (o >= _young_generation_boundary);
duke@435	147	return result;
duke@435	148	}
duke@435	149	};
stefank@2314	150
stefank@2314	151	#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP