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src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.hpp@4dfb2df418f2 (annotated)

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

Thu, 22 Sep 2011 10:57:37 -0700

author

johnc

date

Thu, 22 Sep 2011 10:57:37 -0700

changeset 3175

4dfb2df418f2

parent 2314

f95d63e2154a

child 3540

ab4422d0ed59

permissions

-rw-r--r--

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
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duke@435	4	*
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duke@435	7	* published by the Free Software Foundation.
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duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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duke@435	13	* accompanied this code).
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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_PSMARKSWEEP_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEP_HPP
stefank@2314	27
stefank@2314	28	#include "gc_implementation/shared/collectorCounters.hpp"
stefank@2314	29	#include "gc_implementation/shared/markSweep.inline.hpp"
stefank@2314	30	#include "utilities/stack.hpp"
stefank@2314	31
duke@435	32	class PSAdaptiveSizePolicy;
duke@435	33	class PSYoungGen;
duke@435	34	class PSOldGen;
duke@435	35
duke@435	36	class PSMarkSweep : public MarkSweep {
duke@435	37	private:
duke@435	38	static elapsedTimer _accumulated_time;
duke@435	39	static unsigned int _total_invocations;
duke@435	40	static jlong _time_of_last_gc; // ms
duke@435	41	static CollectorCounters* _counters;
duke@435	42
duke@435	43	// Closure accessors
duke@435	44	static OopClosure* mark_and_push_closure() { return &MarkSweep::mark_and_push_closure; }
duke@435	45	static VoidClosure* follow_stack_closure() { return (VoidClosure*)&MarkSweep::follow_stack_closure; }
duke@435	46	static OopClosure* adjust_pointer_closure() { return (OopClosure*)&MarkSweep::adjust_pointer_closure; }
duke@435	47	static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&MarkSweep::adjust_root_pointer_closure; }
duke@435	48	static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&MarkSweep::is_alive; }
duke@435	49
duke@435	50	debug_only(public:) // Used for PSParallelCompact debugging
duke@435	51	// Mark live objects
duke@435	52	static void mark_sweep_phase1(bool clear_all_softrefs);
duke@435	53	// Calculate new addresses
duke@435	54	static void mark_sweep_phase2();
duke@435	55	debug_only(private:) // End used for PSParallelCompact debugging
duke@435	56	// Update pointers
duke@435	57	static void mark_sweep_phase3();
duke@435	58	// Move objects to new positions
duke@435	59	static void mark_sweep_phase4();
duke@435	60
duke@435	61	debug_only(public:) // Used for PSParallelCompact debugging
duke@435	62	// Temporary data structures for traversal and storing/restoring marks
duke@435	63	static void allocate_stacks();
duke@435	64	static void deallocate_stacks();
duke@435	65	static void set_ref_processor(ReferenceProcessor* rp) { // delete this method
duke@435	66	_ref_processor = rp;
duke@435	67	}
duke@435	68	debug_only(private:) // End used for PSParallelCompact debugging
duke@435	69
duke@435	70	// If objects are left in eden after a collection, try to move the boundary
duke@435	71	// and absorb them into the old gen. Returns true if eden was emptied.
duke@435	72	static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy,
duke@435	73	PSYoungGen* young_gen,
duke@435	74	PSOldGen* old_gen);
duke@435	75
duke@435	76	// Reset time since last full gc
duke@435	77	static void reset_millis_since_last_gc();
duke@435	78
duke@435	79	public:
duke@435	80	static void invoke(bool clear_all_softrefs);
duke@435	81	static void invoke_no_policy(bool clear_all_softrefs);
duke@435	82
duke@435	83	static void initialize();
duke@435	84
duke@435	85	// Public accessors
duke@435	86	static elapsedTimer* accumulated_time() { return &_accumulated_time; }
duke@435	87	static unsigned int total_invocations() { return _total_invocations; }
duke@435	88	static CollectorCounters* counters() { return _counters; }
duke@435	89
duke@435	90	// Time since last full gc (in milliseconds)
duke@435	91	static jlong millis_since_last_gc();
duke@435	92	};
stefank@2314	93
stefank@2314	94	#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEP_HPP