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src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp@1fdb98a17101 (annotated)

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

Sat, 19 Jul 2008 17:38:22 -0400

author

coleenp

date

Sat, 19 Jul 2008 17:38:22 -0400

changeset 672

1fdb98a17101

parent 631

d1605aabd0a1

child 704

850fdf70db2b

permissions

-rw-r--r--

6716785: implicit null checks not triggering with CompressedOops
Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check
Reviewed-by: kvn, jmasa, phh, jcoomes

duke@435	1	/*
xdono@631	2	* Copyright 2001-2008 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	class AdjoiningGenerations;
duke@435	26	class GCTaskManager;
duke@435	27	class PSAdaptiveSizePolicy;
duke@435	28
duke@435	29	class ParallelScavengeHeap : public CollectedHeap {
duke@435	30	friend class VMStructs;
duke@435	31	private:
duke@435	32	static PSYoungGen* _young_gen;
duke@435	33	static PSOldGen* _old_gen;
duke@435	34	static PSPermGen* _perm_gen;
duke@435	35
duke@435	36	// Sizing policy for entire heap
duke@435	37	static PSAdaptiveSizePolicy* _size_policy;
duke@435	38	static PSGCAdaptivePolicyCounters* _gc_policy_counters;
duke@435	39
duke@435	40	static ParallelScavengeHeap* _psh;
duke@435	41
duke@435	42	size_t _perm_gen_alignment;
duke@435	43	size_t _young_gen_alignment;
duke@435	44	size_t _old_gen_alignment;
duke@435	45
duke@435	46	inline size_t set_alignment(size_t& var, size_t val);
duke@435	47
duke@435	48	// Collection of generations that are adjacent in the
duke@435	49	// space reserved for the heap.
duke@435	50	AdjoiningGenerations* _gens;
duke@435	51
duke@435	52	static GCTaskManager* _gc_task_manager; // The task manager.
duke@435	53
duke@435	54	protected:
duke@435	55	static inline size_t total_invocations();
duke@435	56	HeapWord* allocate_new_tlab(size_t size);
duke@435	57	void fill_all_tlabs(bool retire);
duke@435	58
duke@435	59	public:
duke@435	60	ParallelScavengeHeap() : CollectedHeap() {
jmasa@448	61	set_alignment(_perm_gen_alignment, intra_heap_alignment());
jmasa@448	62	set_alignment(_young_gen_alignment, intra_heap_alignment());
jmasa@448	63	set_alignment(_old_gen_alignment, intra_heap_alignment());
duke@435	64	}
duke@435	65
duke@435	66	// For use by VM operations
duke@435	67	enum CollectionType {
duke@435	68	Scavenge,
duke@435	69	MarkSweep
duke@435	70	};
duke@435	71
duke@435	72	ParallelScavengeHeap::Name kind() const {
duke@435	73	return CollectedHeap::ParallelScavengeHeap;
duke@435	74	}
duke@435	75
duke@435	76	static PSYoungGen* young_gen() { return _young_gen; }
duke@435	77	static PSOldGen* old_gen() { return _old_gen; }
duke@435	78	static PSPermGen* perm_gen() { return _perm_gen; }
duke@435	79
duke@435	80	virtual PSAdaptiveSizePolicy* size_policy() { return _size_policy; }
duke@435	81
duke@435	82	static PSGCAdaptivePolicyCounters* gc_policy_counters() { return _gc_policy_counters; }
duke@435	83
duke@435	84	static ParallelScavengeHeap* heap();
duke@435	85
duke@435	86	static GCTaskManager* const gc_task_manager() { return _gc_task_manager; }
duke@435	87
duke@435	88	AdjoiningGenerations* gens() { return _gens; }
duke@435	89
duke@435	90	// Returns JNI_OK on success
duke@435	91	virtual jint initialize();
duke@435	92
duke@435	93	void post_initialize();
duke@435	94	void update_counters();
duke@435	95	// The alignment used for the various generations.
duke@435	96	size_t perm_gen_alignment() const { return _perm_gen_alignment; }
duke@435	97	size_t young_gen_alignment() const { return _young_gen_alignment; }
duke@435	98	size_t old_gen_alignment() const { return _old_gen_alignment; }
duke@435	99
jmasa@448	100	// The alignment used for eden and survivors within the young gen
jmasa@448	101	// and for boundary between young gen and old gen.
jmasa@448	102	size_t intra_heap_alignment() const { return 64 * K; }
duke@435	103
duke@435	104	size_t capacity() const;
duke@435	105	size_t used() const;
duke@435	106
duke@435	107	// Return "true" if all generations (but perm) have reached the
duke@435	108	// maximal committed limit that they can reach, without a garbage
duke@435	109	// collection.
duke@435	110	virtual bool is_maximal_no_gc() const;
duke@435	111
duke@435	112	// Does this heap support heap inspection? (+PrintClassHistogram)
duke@435	113	bool supports_heap_inspection() const { return true; }
duke@435	114
duke@435	115	size_t permanent_capacity() const;
duke@435	116	size_t permanent_used() const;
duke@435	117
duke@435	118	size_t max_capacity() const;
duke@435	119
duke@435	120	// Whether p is in the allocated part of the heap
duke@435	121	bool is_in(const void* p) const;
duke@435	122
duke@435	123	bool is_in_reserved(const void* p) const;
duke@435	124	bool is_in_permanent(const void *p) const { // reserved part
duke@435	125	return perm_gen()->reserved().contains(p);
duke@435	126	}
duke@435	127
duke@435	128	bool is_permanent(const void *p) const { // committed part
duke@435	129	return perm_gen()->is_in(p);
duke@435	130	}
duke@435	131
duke@435	132	static bool is_in_young(oop *p); // reserved part
duke@435	133	static bool is_in_old_or_perm(oop *p); // reserved part
duke@435	134
duke@435	135	// Memory allocation. "gc_time_limit_was_exceeded" will
duke@435	136	// be set to true if the adaptive size policy determine that
duke@435	137	// an excessive amount of time is being spent doing collections
duke@435	138	// and caused a NULL to be returned. If a NULL is not returned,
duke@435	139	// "gc_time_limit_was_exceeded" has an undefined meaning.
duke@435	140
duke@435	141	HeapWord* mem_allocate(size_t size,
duke@435	142	bool is_noref,
duke@435	143	bool is_tlab,
duke@435	144	bool* gc_overhead_limit_was_exceeded);
duke@435	145	HeapWord* failed_mem_allocate(size_t size, bool is_tlab);
duke@435	146
duke@435	147	HeapWord* permanent_mem_allocate(size_t size);
duke@435	148	HeapWord* failed_permanent_mem_allocate(size_t size);
duke@435	149
duke@435	150	// Support for System.gc()
duke@435	151	void collect(GCCause::Cause cause);
duke@435	152
duke@435	153	// This interface assumes that it's being called by the
duke@435	154	// vm thread. It collects the heap assuming that the
duke@435	155	// heap lock is already held and that we are executing in
duke@435	156	// the context of the vm thread.
duke@435	157	void collect_as_vm_thread(GCCause::Cause cause);
duke@435	158
duke@435	159	// These also should be called by the vm thread at a safepoint (e.g., from a
duke@435	160	// VM operation).
duke@435	161	//
duke@435	162	// The first collects the young generation only, unless the scavenge fails; it
duke@435	163	// will then attempt a full gc. The second collects the entire heap; if
duke@435	164	// maximum_compaction is true, it will compact everything and clear all soft
duke@435	165	// references.
duke@435	166	inline void invoke_scavenge();
duke@435	167	inline void invoke_full_gc(bool maximum_compaction);
duke@435	168
duke@435	169	size_t large_typearray_limit() { return FastAllocateSizeLimit; }
duke@435	170
duke@435	171	bool supports_inline_contig_alloc() const { return !UseNUMA; }
iveresov@576	172
iveresov@576	173	HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; }
iveresov@576	174	HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; }
duke@435	175
duke@435	176	void ensure_parsability(bool retire_tlabs);
duke@435	177	void accumulate_statistics_all_tlabs();
duke@435	178	void resize_all_tlabs();
duke@435	179
duke@435	180	size_t unsafe_max_alloc();
duke@435	181
duke@435	182	bool supports_tlab_allocation() const { return true; }
duke@435	183
duke@435	184	size_t tlab_capacity(Thread* thr) const;
duke@435	185	size_t unsafe_max_tlab_alloc(Thread* thr) const;
duke@435	186
duke@435	187	void oop_iterate(OopClosure* cl);
duke@435	188	void object_iterate(ObjectClosure* cl);
duke@435	189	void permanent_oop_iterate(OopClosure* cl);
duke@435	190	void permanent_object_iterate(ObjectClosure* cl);
duke@435	191
duke@435	192	HeapWord* block_start(const void* addr) const;
duke@435	193	size_t block_size(const HeapWord* addr) const;
duke@435	194	bool block_is_obj(const HeapWord* addr) const;
duke@435	195
duke@435	196	jlong millis_since_last_gc();
duke@435	197
duke@435	198	void prepare_for_verify();
duke@435	199	void print() const;
duke@435	200	void print_on(outputStream* st) const;
duke@435	201	virtual void print_gc_threads_on(outputStream* st) const;
duke@435	202	virtual void gc_threads_do(ThreadClosure* tc) const;
duke@435	203	virtual void print_tracing_info() const;
duke@435	204
duke@435	205	void verify(bool allow_dirty, bool silent);
duke@435	206
duke@435	207	void print_heap_change(size_t prev_used);
duke@435	208
duke@435	209	// Resize the young generation. The reserved space for the
duke@435	210	// generation may be expanded in preparation for the resize.
duke@435	211	void resize_young_gen(size_t eden_size, size_t survivor_size);
duke@435	212
duke@435	213	// Resize the old generation. The reserved space for the
duke@435	214	// generation may be expanded in preparation for the resize.
duke@435	215	void resize_old_gen(size_t desired_free_space);
duke@435	216	};
duke@435	217
duke@435	218	inline size_t ParallelScavengeHeap::set_alignment(size_t& var, size_t val)
duke@435	219	{
duke@435	220	assert(is_power_of_2((intptr_t)val), "must be a power of 2");
jmasa@448	221	var = round_to(val, intra_heap_alignment());
duke@435	222	return var;
duke@435	223	}