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src/share/vm/gc_implementation/shared/mutableSpace.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/shared/mutableSpace.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 1

2d8a650513c2

permissions

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP
aoqi@0	26	#define SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP
aoqi@0	27
aoqi@0	28	#include "gc_implementation/shared/immutableSpace.hpp"
aoqi@0	29	#include "memory/memRegion.hpp"
aoqi@0	30	#include "utilities/copy.hpp"
aoqi@0	31
aoqi@0	32	// A MutableSpace is a subtype of ImmutableSpace that supports the
aoqi@0	33	// concept of allocation. This includes the concepts that a space may
aoqi@0	34	// be only partially full, and the querry methods that go with such
aoqi@0	35	// an assumption. MutableSpace is also responsible for minimizing the
aoqi@0	36	// page allocation time by having the memory pretouched (with
aoqi@0	37	// AlwaysPretouch) and for optimizing page placement on NUMA systems
aoqi@0	38	// by make the underlying region interleaved (with UseNUMA).
aoqi@0	39	//
aoqi@0	40	// Invariant: (ImmutableSpace +) bottom() <= top() <= end()
aoqi@0	41	// top() is inclusive and end() is exclusive.
aoqi@0	42
aoqi@0	43	class MutableSpaceMangler;
aoqi@0	44
aoqi@0	45	class MutableSpace: public ImmutableSpace {
aoqi@0	46	friend class VMStructs;
aoqi@0	47
aoqi@0	48	// Helper for mangling unused space in debug builds
aoqi@0	49	MutableSpaceMangler* _mangler;
aoqi@0	50	// The last region which page had been setup to be interleaved.
aoqi@0	51	MemRegion _last_setup_region;
aoqi@0	52	size_t _alignment;
aoqi@0	53	protected:
aoqi@0	54	HeapWord* _top;
aoqi@0	55
aoqi@0	56	MutableSpaceMangler* mangler() { return _mangler; }
aoqi@0	57
aoqi@0	58	void numa_setup_pages(MemRegion mr, bool clear_space);
aoqi@0	59	void pretouch_pages(MemRegion mr);
aoqi@0	60
aoqi@0	61	void set_last_setup_region(MemRegion mr) { _last_setup_region = mr; }
aoqi@0	62	MemRegion last_setup_region() const { return _last_setup_region; }
aoqi@0	63
aoqi@0	64	public:
aoqi@0	65	virtual ~MutableSpace();
aoqi@0	66	MutableSpace(size_t page_size);
aoqi@0	67
aoqi@0	68	// Accessors
aoqi@0	69	HeapWord* top() const { return _top; }
aoqi@0	70	virtual void set_top(HeapWord* value) { _top = value; }
aoqi@0	71
aoqi@0	72	HeapWord** top_addr() { return &_top; }
aoqi@0	73	HeapWord** end_addr() { return &_end; }
aoqi@0	74
aoqi@0	75	virtual void set_bottom(HeapWord* value) { _bottom = value; }
aoqi@0	76	virtual void set_end(HeapWord* value) { _end = value; }
aoqi@0	77
aoqi@0	78	size_t alignment() { return _alignment; }
aoqi@0	79
aoqi@0	80	// Returns a subregion containing all objects in this space.
aoqi@0	81	MemRegion used_region() { return MemRegion(bottom(), top()); }
aoqi@0	82
aoqi@0	83	static const bool SetupPages = true;
aoqi@0	84	static const bool DontSetupPages = false;
aoqi@0	85
aoqi@0	86	// Initialization
aoqi@0	87	virtual void initialize(MemRegion mr,
aoqi@0	88	bool clear_space,
aoqi@0	89	bool mangle_space,
aoqi@0	90	bool setup_pages = SetupPages);
aoqi@0	91
aoqi@0	92	virtual void clear(bool mangle_space);
aoqi@0	93	// Does the usual initialization but optionally resets top to bottom.
aoqi@0	94	#if 0 // MANGLE_SPACE
aoqi@0	95	void initialize(MemRegion mr, bool clear_space, bool reset_top);
aoqi@0	96	#endif
aoqi@0	97	virtual void update() { }
aoqi@0	98	virtual void accumulate_statistics() { }
aoqi@0	99
aoqi@0	100	// Methods used in mangling. See descriptions under SpaceMangler.
aoqi@0	101	virtual void mangle_unused_area() PRODUCT_RETURN;
aoqi@0	102	virtual void mangle_unused_area_complete() PRODUCT_RETURN;
aoqi@0	103	virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
aoqi@0	104	virtual void check_mangled_unused_area_complete() PRODUCT_RETURN;
aoqi@0	105	virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN;
aoqi@0	106
aoqi@0	107	// Used to save the space's current top for later use during mangling.
aoqi@0	108	virtual void set_top_for_allocations() PRODUCT_RETURN;
aoqi@0	109
aoqi@0	110	virtual void ensure_parsability() { }
aoqi@0	111
aoqi@0	112	virtual void mangle_region(MemRegion mr) PRODUCT_RETURN;
aoqi@0	113
aoqi@0	114	// Boolean querries.
aoqi@0	115	bool is_empty() const { return used_in_words() == 0; }
aoqi@0	116	bool not_empty() const { return used_in_words() > 0; }
aoqi@0	117	bool contains(const void* p) const { return _bottom <= p && p < _end; }
aoqi@0	118
aoqi@0	119	// Size computations. Sizes are in bytes.
aoqi@0	120	size_t used_in_bytes() const { return used_in_words() * HeapWordSize; }
aoqi@0	121	size_t free_in_bytes() const { return free_in_words() * HeapWordSize; }
aoqi@0	122
aoqi@0	123	// Size computations. Sizes are in heapwords.
aoqi@0	124	virtual size_t used_in_words() const { return pointer_delta(top(), bottom()); }
aoqi@0	125	virtual size_t free_in_words() const { return pointer_delta(end(), top()); }
aoqi@0	126	virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); }
aoqi@0	127	virtual size_t tlab_used(Thread* thr) const { return used_in_bytes(); }
aoqi@0	128	virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); }
aoqi@0	129
aoqi@0	130	// Allocation (return NULL if full)
aoqi@0	131	virtual HeapWord* allocate(size_t word_size);
aoqi@0	132	virtual HeapWord* cas_allocate(size_t word_size);
aoqi@0	133	// Optional deallocation. Used in NUMA-allocator.
aoqi@0	134	bool cas_deallocate(HeapWord *obj, size_t size);
aoqi@0	135
aoqi@0	136	// Iteration.
aoqi@0	137	void oop_iterate(ExtendedOopClosure* cl);
aoqi@0	138	void oop_iterate_no_header(OopClosure* cl);
aoqi@0	139	void object_iterate(ObjectClosure* cl);
aoqi@0	140
aoqi@0	141	// Debugging
aoqi@0	142	virtual void print() const;
aoqi@0	143	virtual void print_on(outputStream* st) const;
aoqi@0	144	virtual void print_short() const;
aoqi@0	145	virtual void print_short_on(outputStream* st) const;
aoqi@0	146	virtual void verify();
aoqi@0	147	};
aoqi@0	148
aoqi@0	149	#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP