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src/share/vm/memory/tenuredGeneration.hpp@ec98e58952b2 (annotated)

src/share/vm/memory/tenuredGeneration.hpp

Tue, 11 Sep 2012 14:59:23 +0200

author

stefank

date

Tue, 11 Sep 2012 14:59:23 +0200

changeset 4050

ec98e58952b2

parent 2314

f95d63e2154a

child 4542

db9981fd3124

permissions

-rw-r--r--

7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
Summary: Fix the iteration over the system classes and report the correct reference kind.
Reviewed-by: coleenp, rbackman

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"
stefank@2314	32
duke@435	33	// TenuredGeneration models the heap containing old (promoted/tenured) objects.
duke@435	34
duke@435	35	class ParGCAllocBufferWithBOT;
duke@435	36
duke@435	37	class TenuredGeneration: public OneContigSpaceCardGeneration {
duke@435	38	friend class VMStructs;
duke@435	39	protected:
duke@435	40	// current shrinking effect: this damps shrinking when the heap gets empty.
duke@435	41	size_t _shrink_factor;
duke@435	42	// Some statistics from before gc started.
duke@435	43	// These are gathered in the gc_prologue (and should_collect)
duke@435	44	// to control growing/shrinking policy in spite of promotions.
duke@435	45	size_t _capacity_at_prologue;
duke@435	46	size_t _used_at_prologue;
duke@435	47
duke@435	48	#ifndef SERIALGC
duke@435	49	// To support parallel promotion: an array of parallel allocation
duke@435	50	// buffers, one per thread, initially NULL.
duke@435	51	ParGCAllocBufferWithBOT** _alloc_buffers;
duke@435	52	#endif // SERIALGC
duke@435	53
duke@435	54	// Retire all alloc buffers before a full GC, so that they will be
duke@435	55	// re-allocated at the start of the next young GC.
duke@435	56	void retire_alloc_buffers_before_full_gc();
duke@435	57
duke@435	58	GenerationCounters* _gen_counters;
duke@435	59	CSpaceCounters* _space_counters;
duke@435	60
duke@435	61	public:
duke@435	62	TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
duke@435	63	GenRemSet* remset);
duke@435	64
duke@435	65	Generation::Name kind() { return Generation::MarkSweepCompact; }
duke@435	66
duke@435	67	// Printing
duke@435	68	const char* name() const;
duke@435	69	const char* short_name() const { return "Tenured"; }
duke@435	70	bool must_be_youngest() const { return false; }
duke@435	71	bool must_be_oldest() const { return true; }
duke@435	72
duke@435	73	// Does a "full" (forced) collection invoked on this generation collect
duke@435	74	// all younger generations as well? Note that this is a
duke@435	75	// hack to allow the collection of the younger gen first if the flag is
duke@435	76	// set. This is better than using th policy's should_collect_gen0_first()
duke@435	77	// since that causes us to do an extra unnecessary pair of restart-&-stop-world.
duke@435	78	virtual bool full_collects_younger_generations() const {
duke@435	79	return !CollectGen0First;
duke@435	80	}
duke@435	81
duke@435	82	// Mark sweep support
duke@435	83	void compute_new_size();
duke@435	84
duke@435	85	virtual void gc_prologue(bool full);
duke@435	86	virtual void gc_epilogue(bool full);
duke@435	87	bool should_collect(bool full,
duke@435	88	size_t word_size,
duke@435	89	bool is_tlab);
duke@435	90
duke@435	91	virtual void collect(bool full,
duke@435	92	bool clear_all_soft_refs,
duke@435	93	size_t size,
duke@435	94	bool is_tlab);
duke@435	95
duke@435	96	#ifndef SERIALGC
duke@435	97	// Overrides.
duke@435	98	virtual oop par_promote(int thread_num,
duke@435	99	oop obj, markOop m, size_t word_sz);
duke@435	100	virtual void par_promote_alloc_undo(int thread_num,
duke@435	101	HeapWord* obj, size_t word_sz);
duke@435	102	virtual void par_promote_alloc_done(int thread_num);
duke@435	103	#endif // SERIALGC
duke@435	104
duke@435	105	// Performance Counter support
duke@435	106	void update_counters();
duke@435	107
duke@435	108	// Statistics
duke@435	109
duke@435	110	virtual void update_gc_stats(int level, bool full);
duke@435	111
ysr@2243	112	virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
duke@435	113
duke@435	114	void verify_alloc_buffers_clean();
duke@435	115	};
stefank@2314	116
stefank@2314	117	#endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP