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src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp@b985cbb00e68 (annotated)

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

Mon, 12 Aug 2019 18:30:40 +0300

author

apetushkov

date

Mon, 12 Aug 2019 18:30:40 +0300

changeset 9858

b985cbb00e68

parent 5237

f2110083203d

child 9931

fd44df5e3bc3

permissions

-rw-r--r--

8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens

duke@435	1	/*
sla@5237	2	* Copyright (c) 2002, 2013, 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"
sla@5237	31	#include "gc_implementation/shared/gcTrace.hpp"
stefank@2314	32	#include "memory/allocation.hpp"
stefank@2314	33	#include "oops/oop.hpp"
stefank@2314	34	#include "utilities/stack.hpp"
stefank@2314	35
duke@435	36	class GCTaskManager;
duke@435	37	class GCTaskQueue;
duke@435	38	class OopStack;
duke@435	39	class ReferenceProcessor;
duke@435	40	class ParallelScavengeHeap;
sla@5237	41	class ParallelScavengeTracer;
duke@435	42	class PSIsAliveClosure;
duke@435	43	class PSRefProcTaskExecutor;
sla@5237	44	class STWGCTimer;
duke@435	45
duke@435	46	class PSScavenge: AllStatic {
duke@435	47	friend class PSIsAliveClosure;
duke@435	48	friend class PSKeepAliveClosure;
duke@435	49	friend class PSPromotionManager;
duke@435	50
duke@435	51	enum ScavengeSkippedCause {
duke@435	52	not_skipped = 0,
duke@435	53	to_space_not_empty,
duke@435	54	promoted_too_large,
duke@435	55	full_follows_scavenge
duke@435	56	};
duke@435	57
duke@435	58	// Saved value of to_space->top(), used to prevent objects in to_space from
duke@435	59	// being rescanned.
duke@435	60	static HeapWord* _to_space_top_before_gc;
duke@435	61
duke@435	62	// Number of consecutive attempts to scavenge that were skipped
duke@435	63	static int _consecutive_skipped_scavenges;
duke@435	64
duke@435	65
duke@435	66	protected:
duke@435	67	// Flags/counters
stefank@5202	68	static ReferenceProcessor* _ref_processor; // Reference processor for scavenging.
stefank@5202	69	static PSIsAliveClosure _is_alive_closure; // Closure used for reference processing
stefank@5202	70	static CardTableExtension* _card_table; // We cache the card table for fast access.
stefank@5202	71	static bool _survivor_overflow; // Overflow this collection
stefank@5202	72	static uint _tenuring_threshold; // tenuring threshold for next scavenge
stefank@5202	73	static elapsedTimer _accumulated_time; // total time spent on scavenge
sla@5237	74	static STWGCTimer _gc_timer; // GC time book keeper
sla@5237	75	static ParallelScavengeTracer _gc_tracer; // GC tracing
stefank@5202	76	// The lowest address possible for the young_gen.
stefank@5202	77	// This is used to decide if an oop should be scavenged,
stefank@5202	78	// cards should be marked, etc.
stefank@5202	79	static HeapWord* _young_generation_boundary;
stefank@5202	80	// Used to optimize compressed oops young gen boundary checking.
stefank@5202	81	static uintptr_t _young_generation_boundary_compressed;
zgu@3900	82	static Stack<markOop, mtGC> _preserved_mark_stack; // List of marks to be restored after failed promotion
zgu@3900	83	static Stack<oop, mtGC> _preserved_oop_stack; // List of oops that need their mark restored.
stefank@5202	84	static CollectorCounters* _counters; // collector performance counters
duke@435	85
duke@435	86	static void clean_up_failed_promotion();
duke@435	87
duke@435	88	static bool should_attempt_scavenge();
duke@435	89
duke@435	90	static HeapWord* to_space_top_before_gc() { return _to_space_top_before_gc; }
duke@435	91	static inline void save_to_space_top_before_gc();
duke@435	92
duke@435	93	// Private accessors
duke@435	94	static CardTableExtension* const card_table() { assert(_card_table != NULL, "Sanity"); return _card_table; }
apetushkov@9858	95	static const ParallelScavengeTracer* gc_tracer() { return &_gc_tracer; }
duke@435	96
duke@435	97	public:
duke@435	98	// Accessors
jwilhelm@4129	99	static uint tenuring_threshold() { return _tenuring_threshold; }
duke@435	100	static elapsedTimer* accumulated_time() { return &_accumulated_time; }
duke@435	101	static int consecutive_skipped_scavenges()
duke@435	102	{ return _consecutive_skipped_scavenges; }
duke@435	103
duke@435	104	// Performance Counters
duke@435	105	static CollectorCounters* counters() { return _counters; }
duke@435	106
duke@435	107	// Used by scavenge_contents && psMarkSweep
duke@435	108	static ReferenceProcessor* const reference_processor() {
duke@435	109	assert(_ref_processor != NULL, "Sanity");
duke@435	110	return _ref_processor;
duke@435	111	}
duke@435	112	// Used to add tasks
duke@435	113	static GCTaskManager* const gc_task_manager();
duke@435	114	// The promotion managers tell us if they encountered overflow
duke@435	115	static void set_survivor_overflow(bool state) {
duke@435	116	_survivor_overflow = state;
duke@435	117	}
duke@435	118	// Adaptive size policy support. When the young generation/old generation
duke@435	119	// boundary moves, _young_generation_boundary must be reset
duke@435	120	static void set_young_generation_boundary(HeapWord* v) {
duke@435	121	_young_generation_boundary = v;
stefank@5202	122	if (UseCompressedOops) {
stefank@5202	123	_young_generation_boundary_compressed = (uintptr_t)oopDesc::encode_heap_oop((oop)v);
stefank@5202	124	}
duke@435	125	}
duke@435	126
duke@435	127	// Called by parallelScavengeHeap to init the tenuring threshold
duke@435	128	static void initialize();
duke@435	129
jcoomes@3540	130	// Scavenge entry point. This may invoke a full gc; return true if so.
jcoomes@3540	131	static bool invoke();
jcoomes@3540	132	// Return true if a collection was done; false otherwise.
duke@435	133	static bool invoke_no_policy();
duke@435	134
duke@435	135	// If an attempt to promote fails, this method is invoked
duke@435	136	static void oop_promotion_failed(oop obj, markOop obj_mark);
duke@435	137
coleenp@548	138	template <class T> static inline bool should_scavenge(T* p);
duke@435	139
duke@435	140	// These call should_scavenge() above and, if it returns true, also check that
duke@435	141	// the object was not newly copied into to_space. The version with the bool
duke@435	142	// argument is a convenience wrapper that fetches the to_space pointer from
duke@435	143	// the heap and calls the other version (if the arg is true).
coleenp@548	144	template <class T> static inline bool should_scavenge(T* p, MutableSpace* to_space);
coleenp@548	145	template <class T> static inline bool should_scavenge(T* p, bool check_to_space);
duke@435	146
iveresov@3536	147	template <class T, bool promote_immediately>
iveresov@3536	148	inline static void copy_and_push_safe_barrier(PSPromotionManager* pm, T* p);
duke@435	149
coleenp@4037	150	static void copy_and_push_safe_barrier_from_klass(PSPromotionManager* pm, oop* p);
coleenp@4037	151
duke@435	152	// Is an object in the young generation
stefank@5202	153	// This assumes that the 'o' is in the heap,
duke@435	154	// so it only checks one side of the complete predicate.
stefank@5202	155
stefank@5202	156	inline static bool is_obj_in_young(oop o) {
stefank@5202	157	return (HeapWord*)o >= _young_generation_boundary;
stefank@5202	158	}
stefank@5202	159
stefank@5202	160	inline static bool is_obj_in_young(narrowOop o) {
stefank@5202	161	return (uintptr_t)o >= _young_generation_boundary_compressed;
stefank@5202	162	}
stefank@5202	163
duke@435	164	inline static bool is_obj_in_young(HeapWord* o) {
stefank@5202	165	return o >= _young_generation_boundary;
duke@435	166	}
duke@435	167	};
stefank@2314	168
stefank@2314	169	#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP