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src/share/vm/gc_implementation/shared/vmGCOperations.hpp@ba764ed4b6f2 (annotated)

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

Sun, 13 Apr 2008 17:43:42 -0400

author

coleenp

date

Sun, 13 Apr 2008 17:43:42 -0400

changeset 548

ba764ed4b6f2

parent 435

a61af66fc99e

child 574

c0492d52d55b

permissions

-rw-r--r--

6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold

duke@435	1	/*
duke@435	2	* Copyright 2005-2006 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	// The following class hierarchy represents
duke@435	26	// a set of operations (VM_Operation) related to GC.
duke@435	27	//
duke@435	28	// VM_Operation
duke@435	29	// VM_GC_Operation
duke@435	30	// VM_GC_HeapInspection
duke@435	31	// VM_GenCollectForAllocation
duke@435	32	// VM_GenCollectFull
duke@435	33	// VM_GenCollectFullConcurrent
duke@435	34	// VM_ParallelGCFailedAllocation
duke@435	35	// VM_ParallelGCFailedPermanentAllocation
duke@435	36	// VM_ParallelGCSystemGC
duke@435	37	// VM_GC_Operation
duke@435	38	// - implements methods common to all classes in the hierarchy:
duke@435	39	// prevents multiple gc requests and manages lock on heap;
duke@435	40	//
duke@435	41	// VM_GC_HeapInspection
duke@435	42	// - prints class histogram on SIGBREAK if PrintClassHistogram
duke@435	43	// is specified; and also the attach "inspectheap" operation
duke@435	44	//
duke@435	45	// VM_GenCollectForAllocation
duke@435	46	// VM_ParallelGCFailedAllocation
duke@435	47	// VM_ParallelGCFailedPermanentAllocation
duke@435	48	// - this operation is invoked when allocation is failed;
duke@435	49	// operation performs garbage collection and tries to
duke@435	50	// allocate afterwards;
duke@435	51	//
duke@435	52	// VM_GenCollectFull
duke@435	53	// VM_GenCollectFullConcurrent
duke@435	54	// VM_ParallelGCSystemGC
duke@435	55	// - these operations preform full collection of heaps of
duke@435	56	// different kind
duke@435	57	//
duke@435	58
duke@435	59	class VM_GC_Operation: public VM_Operation {
duke@435	60	protected:
duke@435	61	BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
duke@435	62	unsigned int _gc_count_before; // gc count before acquiring PLL
duke@435	63	unsigned int _full_gc_count_before; // full gc count before acquiring PLL
duke@435	64	bool _full; // whether a "full" collection
duke@435	65	bool _prologue_succeeded; // whether doit_prologue succeeded
duke@435	66	GCCause::Cause _gc_cause; // the putative cause for this gc op
duke@435	67	bool _gc_locked; // will be set if gc was locked
duke@435	68
duke@435	69	virtual bool skip_operation() const;
duke@435	70
duke@435	71	// java.lang.ref.Reference support
duke@435	72	void acquire_pending_list_lock();
duke@435	73	void release_and_notify_pending_list_lock();
duke@435	74
duke@435	75	public:
duke@435	76	VM_GC_Operation(unsigned int gc_count_before,
duke@435	77	unsigned int full_gc_count_before = 0,
duke@435	78	bool full = false) {
duke@435	79	_full = full;
duke@435	80	_prologue_succeeded = false;
duke@435	81	_gc_count_before = gc_count_before;
duke@435	82
duke@435	83	// A subclass constructor will likely overwrite the following
duke@435	84	_gc_cause = GCCause::_no_cause_specified;
duke@435	85
duke@435	86	_gc_locked = false;
duke@435	87
duke@435	88	if (full) {
duke@435	89	_full_gc_count_before = full_gc_count_before;
duke@435	90	}
duke@435	91	}
duke@435	92	~VM_GC_Operation() {}
duke@435	93
duke@435	94	// Acquire the reference synchronization lock
duke@435	95	virtual bool doit_prologue();
duke@435	96	// Do notifyAll (if needed) and release held lock
duke@435	97	virtual void doit_epilogue();
duke@435	98
duke@435	99	virtual bool allow_nested_vm_operations() const { return true; }
duke@435	100	bool prologue_succeeded() const { return _prologue_succeeded; }
duke@435	101
duke@435	102	void set_gc_locked() { _gc_locked = true; }
duke@435	103	bool gc_locked() const { return _gc_locked; }
duke@435	104
duke@435	105	static void notify_gc_begin(bool full = false);
duke@435	106	static void notify_gc_end();
duke@435	107	};
duke@435	108
duke@435	109
duke@435	110	class VM_GC_HeapInspection: public VM_GC_Operation {
duke@435	111	private:
duke@435	112	outputStream* _out;
duke@435	113	bool _full_gc;
duke@435	114	public:
duke@435	115	VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
duke@435	116	VM_GC_Operation(0 /* total collections, dummy, ignored */,
duke@435	117	0 /* total full collections, dummy, ignored */,
duke@435	118	request_full_gc) {
duke@435	119	_out = out;
duke@435	120	_full_gc = request_full_gc;
duke@435	121	}
duke@435	122
duke@435	123	~VM_GC_HeapInspection() {}
duke@435	124	virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
duke@435	125	virtual bool skip_operation() const;
duke@435	126	virtual bool doit_prologue();
duke@435	127	virtual void doit();
duke@435	128	};
duke@435	129
duke@435	130
duke@435	131	class VM_GenCollectForAllocation: public VM_GC_Operation {
duke@435	132	private:
duke@435	133	HeapWord* _res;
duke@435	134	size_t _size; // size of object to be allocated.
duke@435	135	bool _tlab; // alloc is of a tlab.
duke@435	136	public:
duke@435	137	VM_GenCollectForAllocation(size_t size,
duke@435	138	bool tlab,
duke@435	139	unsigned int gc_count_before)
duke@435	140	: VM_GC_Operation(gc_count_before),
duke@435	141	_size(size),
duke@435	142	_tlab(tlab) {
duke@435	143	_res = NULL;
duke@435	144	}
duke@435	145	~VM_GenCollectForAllocation() {}
duke@435	146	virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
duke@435	147	virtual void doit();
duke@435	148	HeapWord* result() const { return _res; }
duke@435	149	};
duke@435	150
duke@435	151
duke@435	152	// VM operation to invoke a collection of the heap as a
duke@435	153	// GenCollectedHeap heap.
duke@435	154	class VM_GenCollectFull: public VM_GC_Operation {
duke@435	155	private:
duke@435	156	int _max_level;
duke@435	157	public:
duke@435	158	VM_GenCollectFull(unsigned int gc_count_before,
duke@435	159	unsigned int full_gc_count_before,
duke@435	160	GCCause::Cause gc_cause,
duke@435	161	int max_level)
duke@435	162	: VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */),
duke@435	163	_max_level(max_level)
duke@435	164	{ _gc_cause = gc_cause; }
duke@435	165	~VM_GenCollectFull() {}
duke@435	166	virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
duke@435	167	virtual void doit();
duke@435	168	};