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src/share/vm/gc_implementation/shared/mutableSpace.hpp@0982ec23da03 (annotated)

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

Thu, 19 Jun 2014 13:31:14 +0200

author

brutisso

date

Thu, 19 Jun 2014 13:31:14 +0200

changeset 6904

0982ec23da03

parent 6376

cfd4aac53239

child 6876

710a3c8b516e

permissions

-rw-r--r--

8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
Reviewed-by: jwilhelm, ehelin, tschatzl

duke@435	1	/*
brutisso@3711	2	* Copyright (c) 2001, 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_SHARED_MUTABLESPACE_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP
stefank@2314	27
stefank@2314	28	#include "gc_implementation/shared/immutableSpace.hpp"
stefank@2314	29	#include "memory/memRegion.hpp"
stefank@2314	30	#include "utilities/copy.hpp"
stefank@2314	31
duke@435	32	// A MutableSpace is a subtype of ImmutableSpace that supports the
duke@435	33	// concept of allocation. This includes the concepts that a space may
duke@435	34	// be only partially full, and the querry methods that go with such
iveresov@970	35	// an assumption. MutableSpace is also responsible for minimizing the
iveresov@970	36	// page allocation time by having the memory pretouched (with
iveresov@970	37	// AlwaysPretouch) and for optimizing page placement on NUMA systems
iveresov@970	38	// by make the underlying region interleaved (with UseNUMA).
duke@435	39	//
duke@435	40	// Invariant: (ImmutableSpace +) bottom() <= top() <= end()
duke@435	41	// top() is inclusive and end() is exclusive.
duke@435	42
jmasa@698	43	class MutableSpaceMangler;
jmasa@698	44
duke@435	45	class MutableSpace: public ImmutableSpace {
duke@435	46	friend class VMStructs;
jmasa@698	47
jmasa@698	48	// Helper for mangling unused space in debug builds
jmasa@698	49	MutableSpaceMangler* _mangler;
iveresov@970	50	// The last region which page had been setup to be interleaved.
iveresov@970	51	MemRegion _last_setup_region;
iveresov@970	52	size_t _alignment;
duke@435	53	protected:
duke@435	54	HeapWord* _top;
duke@435	55
jmasa@698	56	MutableSpaceMangler* mangler() { return _mangler; }
jmasa@698	57
iveresov@970	58	void numa_setup_pages(MemRegion mr, bool clear_space);
iveresov@970	59	void pretouch_pages(MemRegion mr);
iveresov@970	60
iveresov@970	61	void set_last_setup_region(MemRegion mr) { _last_setup_region = mr; }
iveresov@970	62	MemRegion last_setup_region() const { return _last_setup_region; }
iveresov@970	63
duke@435	64	public:
jmasa@698	65	virtual ~MutableSpace();
iveresov@970	66	MutableSpace(size_t page_size);
jmasa@698	67
duke@435	68	// Accessors
duke@435	69	HeapWord* top() const { return _top; }
duke@435	70	virtual void set_top(HeapWord* value) { _top = value; }
duke@435	71
duke@435	72	HeapWord** top_addr() { return &_top; }
duke@435	73	HeapWord** end_addr() { return &_end; }
duke@435	74
duke@435	75	virtual void set_bottom(HeapWord* value) { _bottom = value; }
duke@435	76	virtual void set_end(HeapWord* value) { _end = value; }
duke@435	77
iveresov@970	78	size_t alignment() { return _alignment; }
iveresov@970	79
duke@435	80	// Returns a subregion containing all objects in this space.
duke@435	81	MemRegion used_region() { return MemRegion(bottom(), top()); }
duke@435	82
iveresov@970	83	static const bool SetupPages = true;
iveresov@970	84	static const bool DontSetupPages = false;
iveresov@970	85
duke@435	86	// Initialization
jmasa@698	87	virtual void initialize(MemRegion mr,
jmasa@698	88	bool clear_space,
iveresov@970	89	bool mangle_space,
iveresov@970	90	bool setup_pages = SetupPages);
iveresov@970	91
jmasa@698	92	virtual void clear(bool mangle_space);
jmasa@698	93	// Does the usual initialization but optionally resets top to bottom.
jmasa@698	94	#if 0 // MANGLE_SPACE
jmasa@698	95	void initialize(MemRegion mr, bool clear_space, bool reset_top);
jmasa@698	96	#endif
duke@435	97	virtual void update() { }
duke@435	98	virtual void accumulate_statistics() { }
duke@435	99
jmasa@698	100	// Methods used in mangling. See descriptions under SpaceMangler.
jmasa@698	101	virtual void mangle_unused_area() PRODUCT_RETURN;
jmasa@698	102	virtual void mangle_unused_area_complete() PRODUCT_RETURN;
jmasa@698	103	virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
jmasa@698	104	virtual void check_mangled_unused_area_complete() PRODUCT_RETURN;
jmasa@698	105	virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN;
jmasa@698	106
jmasa@698	107	// Used to save the space's current top for later use during mangling.
jmasa@698	108	virtual void set_top_for_allocations() PRODUCT_RETURN;
jmasa@698	109
duke@435	110	virtual void ensure_parsability() { }
duke@435	111
jmasa@698	112	virtual void mangle_region(MemRegion mr) PRODUCT_RETURN;
duke@435	113
duke@435	114	// Boolean querries.
duke@435	115	bool is_empty() const { return used_in_words() == 0; }
duke@435	116	bool not_empty() const { return used_in_words() > 0; }
duke@435	117	bool contains(const void* p) const { return _bottom <= p && p < _end; }
duke@435	118
duke@435	119	// Size computations. Sizes are in bytes.
duke@435	120	size_t used_in_bytes() const { return used_in_words() * HeapWordSize; }
duke@435	121	size_t free_in_bytes() const { return free_in_words() * HeapWordSize; }
duke@435	122
duke@435	123	// Size computations. Sizes are in heapwords.
duke@435	124	virtual size_t used_in_words() const { return pointer_delta(top(), bottom()); }
duke@435	125	virtual size_t free_in_words() const { return pointer_delta(end(), top()); }
duke@435	126	virtual size_t tlab_capacity(Thread* thr) const { return capacity_in_bytes(); }
brutisso@6376	127	virtual size_t tlab_used(Thread* thr) const { return used_in_bytes(); }
duke@435	128	virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes(); }
duke@435	129
duke@435	130	// Allocation (return NULL if full)
duke@435	131	virtual HeapWord* allocate(size_t word_size);
duke@435	132	virtual HeapWord* cas_allocate(size_t word_size);
duke@435	133	// Optional deallocation. Used in NUMA-allocator.
duke@435	134	bool cas_deallocate(HeapWord *obj, size_t size);
duke@435	135
duke@435	136	// Iteration.
coleenp@4037	137	void oop_iterate(ExtendedOopClosure* cl);
coleenp@4037	138	void oop_iterate_no_header(OopClosure* cl);
duke@435	139	void object_iterate(ObjectClosure* cl);
duke@435	140
duke@435	141	// Debugging
duke@435	142	virtual void print() const;
duke@435	143	virtual void print_on(outputStream* st) const;
duke@435	144	virtual void print_short() const;
duke@435	145	virtual void print_short_on(outputStream* st) const;
brutisso@3711	146	virtual void verify();
duke@435	147	};
stefank@2314	148
stefank@2314	149	#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLESPACE_HPP