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src/share/vm/memory/tenuredGeneration.hpp@db9981fd3124 (annotated)

src/share/vm/memory/tenuredGeneration.hpp

Wed, 23 Jan 2013 13:02:39 -0500

author

jprovino

date

Wed, 23 Jan 2013 13:02:39 -0500

changeset 4542

db9981fd3124

parent 2314

f95d63e2154a

child 4900

8617e38bb4cb

permissions

-rw-r--r--

8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
Summary: Rename INCLUDE_ALTERNATE_GCS to INCLUDE_ALL_GCS and replace SERIALGC with INCLUDE_ALL_GCS.
Reviewed-by: coleenp, stefank

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2001, 2010, 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	// current shrinking effect: this damps shrinking when the heap gets empty.
duke@435	42	size_t _shrink_factor;
duke@435	43	// Some statistics from before gc started.
duke@435	44	// These are gathered in the gc_prologue (and should_collect)
duke@435	45	// to control growing/shrinking policy in spite of promotions.
duke@435	46	size_t _capacity_at_prologue;
duke@435	47	size_t _used_at_prologue;
duke@435	48
jprovino@4542	49	#if INCLUDE_ALL_GCS
duke@435	50	// To support parallel promotion: an array of parallel allocation
duke@435	51	// buffers, one per thread, initially NULL.
duke@435	52	ParGCAllocBufferWithBOT** _alloc_buffers;
jprovino@4542	53	#endif // INCLUDE_ALL_GCS
duke@435	54
duke@435	55	// Retire all alloc buffers before a full GC, so that they will be
duke@435	56	// re-allocated at the start of the next young GC.
duke@435	57	void retire_alloc_buffers_before_full_gc();
duke@435	58
duke@435	59	GenerationCounters* _gen_counters;
duke@435	60	CSpaceCounters* _space_counters;
duke@435	61
duke@435	62	public:
duke@435	63	TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
duke@435	64	GenRemSet* remset);
duke@435	65
duke@435	66	Generation::Name kind() { return Generation::MarkSweepCompact; }
duke@435	67
duke@435	68	// Printing
duke@435	69	const char* name() const;
duke@435	70	const char* short_name() const { return "Tenured"; }
duke@435	71	bool must_be_youngest() const { return false; }
duke@435	72	bool must_be_oldest() const { return true; }
duke@435	73
duke@435	74	// Does a "full" (forced) collection invoked on this generation collect
duke@435	75	// all younger generations as well? Note that this is a
duke@435	76	// hack to allow the collection of the younger gen first if the flag is
duke@435	77	// set. This is better than using th policy's should_collect_gen0_first()
duke@435	78	// since that causes us to do an extra unnecessary pair of restart-&-stop-world.
duke@435	79	virtual bool full_collects_younger_generations() const {
duke@435	80	return !CollectGen0First;
duke@435	81	}
duke@435	82
duke@435	83	// Mark sweep support
duke@435	84	void compute_new_size();
duke@435	85
duke@435	86	virtual void gc_prologue(bool full);
duke@435	87	virtual void gc_epilogue(bool full);
duke@435	88	bool should_collect(bool full,
duke@435	89	size_t word_size,
duke@435	90	bool is_tlab);
duke@435	91
duke@435	92	virtual void collect(bool full,
duke@435	93	bool clear_all_soft_refs,
duke@435	94	size_t size,
duke@435	95	bool is_tlab);
duke@435	96
jprovino@4542	97	#if INCLUDE_ALL_GCS
duke@435	98	// Overrides.
duke@435	99	virtual oop par_promote(int thread_num,
duke@435	100	oop obj, markOop m, size_t word_sz);
duke@435	101	virtual void par_promote_alloc_undo(int thread_num,
duke@435	102	HeapWord* obj, size_t word_sz);
duke@435	103	virtual void par_promote_alloc_done(int thread_num);
jprovino@4542	104	#endif // INCLUDE_ALL_GCS
duke@435	105
duke@435	106	// Performance Counter support
duke@435	107	void update_counters();
duke@435	108
duke@435	109	// Statistics
duke@435	110
duke@435	111	virtual void update_gc_stats(int level, bool full);
duke@435	112
ysr@2243	113	virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
duke@435	114
duke@435	115	void verify_alloc_buffers_clean();
duke@435	116	};
stefank@2314	117
stefank@2314	118	#endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP