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src/share/vm/runtime/virtualspace.hpp@37f87013dfd8 (annotated)

src/share/vm/runtime/virtualspace.hpp

Thu, 05 Jun 2008 15:57:56 -0700

author

ysr

date

Thu, 05 Jun 2008 15:57:56 -0700

changeset 777

37f87013dfd8

parent 435

a61af66fc99e

child 672

1fdb98a17101

permissions

-rw-r--r--

6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr

duke@435	1	/*
duke@435	2	* Copyright 1997-2005 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	// ReservedSpace is a data structure for reserving a contiguous address range.
duke@435	26
duke@435	27	class ReservedSpace VALUE_OBJ_CLASS_SPEC {
duke@435	28	friend class VMStructs;
duke@435	29	private:
duke@435	30	char* _base;
duke@435	31	size_t _size;
duke@435	32	size_t _alignment;
duke@435	33	bool _special;
duke@435	34
duke@435	35	// ReservedSpace
duke@435	36	ReservedSpace(char* base, size_t size, size_t alignment, bool special);
duke@435	37	void initialize(size_t size, size_t alignment, bool large,
duke@435	38	char* requested_address = NULL);
duke@435	39
duke@435	40	// Release parts of an already-reserved memory region [addr, addr + len) to
duke@435	41	// get a new region that has "compound alignment." Return the start of the
duke@435	42	// resulting region, or NULL on failure.
duke@435	43	//
duke@435	44	// The region is logically divided into a prefix and a suffix. The prefix
duke@435	45	// starts at the result address, which is aligned to prefix_align. The suffix
duke@435	46	// starts at result address + prefix_size, which is aligned to suffix_align.
duke@435	47	// The total size of the result region is size prefix_size + suffix_size.
duke@435	48	char* align_reserved_region(char* addr, const size_t len,
duke@435	49	const size_t prefix_size,
duke@435	50	const size_t prefix_align,
duke@435	51	const size_t suffix_size,
duke@435	52	const size_t suffix_align);
duke@435	53
duke@435	54	// Reserve memory, call align_reserved_region() to alignment it and return the
duke@435	55	// result.
duke@435	56	char* reserve_and_align(const size_t reserve_size,
duke@435	57	const size_t prefix_size,
duke@435	58	const size_t prefix_align,
duke@435	59	const size_t suffix_size,
duke@435	60	const size_t suffix_align);
duke@435	61
duke@435	62	public:
duke@435	63	// Constructor
duke@435	64	ReservedSpace(size_t size);
duke@435	65	ReservedSpace(size_t size, size_t alignment, bool large,
duke@435	66	char* requested_address = NULL);
duke@435	67	ReservedSpace(const size_t prefix_size, const size_t prefix_align,
duke@435	68	const size_t suffix_size, const size_t suffix_align);
duke@435	69
duke@435	70	// Accessors
duke@435	71	char* base() const { return _base; }
duke@435	72	size_t size() const { return _size; }
duke@435	73	size_t alignment() const { return _alignment; }
duke@435	74	bool special() const { return _special; }
duke@435	75
duke@435	76	bool is_reserved() const { return _base != NULL; }
duke@435	77	void release();
duke@435	78
duke@435	79	// Splitting
duke@435	80	ReservedSpace first_part(size_t partition_size, size_t alignment,
duke@435	81	bool split = false, bool realloc = true);
duke@435	82	ReservedSpace last_part (size_t partition_size, size_t alignment);
duke@435	83
duke@435	84	// These simply call the above using the default alignment.
duke@435	85	inline ReservedSpace first_part(size_t partition_size,
duke@435	86	bool split = false, bool realloc = true);
duke@435	87	inline ReservedSpace last_part (size_t partition_size);
duke@435	88
duke@435	89	// Alignment
duke@435	90	static size_t page_align_size_up(size_t size);
duke@435	91	static size_t page_align_size_down(size_t size);
duke@435	92	static size_t allocation_align_size_up(size_t size);
duke@435	93	static size_t allocation_align_size_down(size_t size);
duke@435	94	};
duke@435	95
duke@435	96	ReservedSpace
duke@435	97	ReservedSpace::first_part(size_t partition_size, bool split, bool realloc)
duke@435	98	{
duke@435	99	return first_part(partition_size, alignment(), split, realloc);
duke@435	100	}
duke@435	101
duke@435	102	ReservedSpace ReservedSpace::last_part(size_t partition_size)
duke@435	103	{
duke@435	104	return last_part(partition_size, alignment());
duke@435	105	}
duke@435	106
duke@435	107	// VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
duke@435	108
duke@435	109	class VirtualSpace VALUE_OBJ_CLASS_SPEC {
duke@435	110	friend class VMStructs;
duke@435	111	private:
duke@435	112	// Reserved area
duke@435	113	char* _low_boundary;
duke@435	114	char* _high_boundary;
duke@435	115
duke@435	116	// Committed area
duke@435	117	char* _low;
duke@435	118	char* _high;
duke@435	119
duke@435	120	// The entire space has been committed and pinned in memory, no
duke@435	121	// os::commit_memory() or os::uncommit_memory().
duke@435	122	bool _special;
duke@435	123
duke@435	124	// MPSS Support
duke@435	125	// Each virtualspace region has a lower, middle, and upper region.
duke@435	126	// Each region has an end boundary and a high pointer which is the
duke@435	127	// high water mark for the last allocated byte.
duke@435	128	// The lower and upper unaligned to LargePageSizeInBytes uses default page.
duke@435	129	// size. The middle region uses large page size.
duke@435	130	char* _lower_high;
duke@435	131	char* _middle_high;
duke@435	132	char* _upper_high;
duke@435	133
duke@435	134	char* _lower_high_boundary;
duke@435	135	char* _middle_high_boundary;
duke@435	136	char* _upper_high_boundary;
duke@435	137
duke@435	138	size_t _lower_alignment;
duke@435	139	size_t _middle_alignment;
duke@435	140	size_t _upper_alignment;
duke@435	141
duke@435	142	// MPSS Accessors
duke@435	143	char* lower_high() const { return _lower_high; }
duke@435	144	char* middle_high() const { return _middle_high; }
duke@435	145	char* upper_high() const { return _upper_high; }
duke@435	146
duke@435	147	char* lower_high_boundary() const { return _lower_high_boundary; }
duke@435	148	char* middle_high_boundary() const { return _middle_high_boundary; }
duke@435	149	char* upper_high_boundary() const { return _upper_high_boundary; }
duke@435	150
duke@435	151	size_t lower_alignment() const { return _lower_alignment; }
duke@435	152	size_t middle_alignment() const { return _middle_alignment; }
duke@435	153	size_t upper_alignment() const { return _upper_alignment; }
duke@435	154
duke@435	155	public:
duke@435	156	// Committed area
duke@435	157	char* low() const { return _low; }
duke@435	158	char* high() const { return _high; }
duke@435	159
duke@435	160	// Reserved area
duke@435	161	char* low_boundary() const { return _low_boundary; }
duke@435	162	char* high_boundary() const { return _high_boundary; }
duke@435	163
duke@435	164	bool special() const { return _special; }
duke@435	165
duke@435	166	public:
duke@435	167	// Initialization
duke@435	168	VirtualSpace();
duke@435	169	bool initialize(ReservedSpace rs, size_t committed_byte_size);
duke@435	170
duke@435	171	// Destruction
duke@435	172	~VirtualSpace();
duke@435	173
duke@435	174	// Testers (all sizes are byte sizes)
duke@435	175	size_t committed_size() const;
duke@435	176	size_t reserved_size() const;
duke@435	177	size_t uncommitted_size() const;
duke@435	178	bool contains(const void* p) const;
duke@435	179
duke@435	180	// Operations
duke@435	181	// returns true on success, false otherwise
duke@435	182	bool expand_by(size_t bytes, bool pre_touch = false);
duke@435	183	void shrink_by(size_t bytes);
duke@435	184	void release();
duke@435	185
duke@435	186	void check_for_contiguity() PRODUCT_RETURN;
duke@435	187
duke@435	188	// Debugging
duke@435	189	void print() PRODUCT_RETURN;
duke@435	190	};