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src/share/vm/memory/tenuredGeneration.hpp@6acf14e730dd (annotated)

src/share/vm/memory/tenuredGeneration.hpp

Tue, 16 Feb 2016 21:42:29 +0000

author

poonam

date

Tue, 16 Feb 2016 21:42:29 +0000

changeset 8308

6acf14e730dd

parent 6198

55fb97c4c58d

child 6876

710a3c8b516e

permissions

-rw-r--r--

8072725: Provide more granular levels for GC verification
Summary: Add option VerifySubSet to selectively verify the memory sub-systems
Reviewed-by: kevinw, jmasa

duke@435	1	/*
mikael@6198	2	* Copyright (c) 2001, 2013, 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_MEMORY_TENUREDGENERATION_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_TENUREDGENERATION_HPP
stefank@2314	27
stefank@2314	28	#include "gc_implementation/shared/cSpaceCounters.hpp"
stefank@2314	29	#include "gc_implementation/shared/gcStats.hpp"
stefank@2314	30	#include "gc_implementation/shared/generationCounters.hpp"
stefank@2314	31	#include "memory/generation.hpp"
jprovino@4542	32	#include "utilities/macros.hpp"
stefank@2314	33
duke@435	34	// TenuredGeneration models the heap containing old (promoted/tenured) objects.
duke@435	35
duke@435	36	class ParGCAllocBufferWithBOT;
duke@435	37
duke@435	38	class TenuredGeneration: public OneContigSpaceCardGeneration {
duke@435	39	friend class VMStructs;
duke@435	40	protected:
duke@435	41
jprovino@4542	42	#if INCLUDE_ALL_GCS
duke@435	43	// To support parallel promotion: an array of parallel allocation
duke@435	44	// buffers, one per thread, initially NULL.
duke@435	45	ParGCAllocBufferWithBOT** _alloc_buffers;
jprovino@4542	46	#endif // INCLUDE_ALL_GCS
duke@435	47
duke@435	48	// Retire all alloc buffers before a full GC, so that they will be
duke@435	49	// re-allocated at the start of the next young GC.
duke@435	50	void retire_alloc_buffers_before_full_gc();
duke@435	51
duke@435	52	GenerationCounters* _gen_counters;
duke@435	53	CSpaceCounters* _space_counters;
duke@435	54
duke@435	55	public:
duke@435	56	TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
duke@435	57	GenRemSet* remset);
duke@435	58
duke@435	59	Generation::Name kind() { return Generation::MarkSweepCompact; }
duke@435	60
duke@435	61	// Printing
duke@435	62	const char* name() const;
duke@435	63	const char* short_name() const { return "Tenured"; }
duke@435	64	bool must_be_youngest() const { return false; }
duke@435	65	bool must_be_oldest() const { return true; }
duke@435	66
duke@435	67	// Does a "full" (forced) collection invoked on this generation collect
duke@435	68	// all younger generations as well? Note that this is a
duke@435	69	// hack to allow the collection of the younger gen first if the flag is
duke@435	70	// set. This is better than using th policy's should_collect_gen0_first()
duke@435	71	// since that causes us to do an extra unnecessary pair of restart-&-stop-world.
duke@435	72	virtual bool full_collects_younger_generations() const {
duke@435	73	return !CollectGen0First;
duke@435	74	}
duke@435	75
duke@435	76	virtual void gc_prologue(bool full);
duke@435	77	virtual void gc_epilogue(bool full);
duke@435	78	bool should_collect(bool full,
duke@435	79	size_t word_size,
duke@435	80	bool is_tlab);
duke@435	81
duke@435	82	virtual void collect(bool full,
duke@435	83	bool clear_all_soft_refs,
duke@435	84	size_t size,
duke@435	85	bool is_tlab);
jmasa@4900	86	virtual void compute_new_size();
duke@435	87
jprovino@4542	88	#if INCLUDE_ALL_GCS
duke@435	89	// Overrides.
duke@435	90	virtual oop par_promote(int thread_num,
duke@435	91	oop obj, markOop m, size_t word_sz);
duke@435	92	virtual void par_promote_alloc_undo(int thread_num,
duke@435	93	HeapWord* obj, size_t word_sz);
duke@435	94	virtual void par_promote_alloc_done(int thread_num);
jprovino@4542	95	#endif // INCLUDE_ALL_GCS
duke@435	96
duke@435	97	// Performance Counter support
duke@435	98	void update_counters();
duke@435	99
duke@435	100	// Statistics
duke@435	101
duke@435	102	virtual void update_gc_stats(int level, bool full);
duke@435	103
ysr@2243	104	virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
duke@435	105
duke@435	106	void verify_alloc_buffers_clean();
duke@435	107	};
stefank@2314	108
stefank@2314	109	#endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP