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src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp@894b1d7c7e01 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp

Tue, 28 Sep 2010 15:56:15 -0700

author

jcoomes

date

Tue, 28 Sep 2010 15:56:15 -0700

changeset 2191

894b1d7c7e01

parent 1993

b2a00dd3117c

child 2314

f95d63e2154a

permissions

-rw-r--r--

6423256: GC stacks should use a better data structure
6942771: SEGV in ParScanThreadState::take_from_overflow_stack
Reviewed-by: apetrusenko, ysr, pbk

duke@435	1	/*
jcoomes@1993	2	* Copyright (c) 2005, 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
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_psCompactionManager.cpp.incl"
duke@435	27
duke@435	28	PSOldGen* ParCompactionManager::_old_gen = NULL;
duke@435	29	ParCompactionManager** ParCompactionManager::_manager_array = NULL;
duke@435	30	OopTaskQueueSet* ParCompactionManager::_stack_array = NULL;
jcoomes@1746	31	ParCompactionManager::ObjArrayTaskQueueSet*
jcoomes@1746	32	ParCompactionManager::_objarray_queues = NULL;
duke@435	33	ObjectStartArray* ParCompactionManager::_start_array = NULL;
duke@435	34	ParMarkBitMap* ParCompactionManager::_mark_bitmap = NULL;
jcoomes@1993	35	RegionTaskQueueSet* ParCompactionManager::_region_array = NULL;
duke@435	36
duke@435	37	ParCompactionManager::ParCompactionManager() :
duke@435	38	_action(CopyAndUpdate) {
duke@435	39
duke@435	40	ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435	41	assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
duke@435	42
duke@435	43	_old_gen = heap->old_gen();
duke@435	44	_start_array = old_gen()->start_array();
duke@435	45
duke@435	46	marking_stack()->initialize();
jcoomes@1993	47	_objarray_stack.initialize();
jcoomes@810	48	region_stack()->initialize();
duke@435	49	}
duke@435	50
duke@435	51	void ParCompactionManager::initialize(ParMarkBitMap* mbm) {
duke@435	52	assert(PSParallelCompact::gc_task_manager() != NULL,
duke@435	53	"Needed for initialization");
duke@435	54
duke@435	55	_mark_bitmap = mbm;
duke@435	56
duke@435	57	uint parallel_gc_threads = PSParallelCompact::gc_task_manager()->workers();
duke@435	58
duke@435	59	assert(_manager_array == NULL, "Attempt to initialize twice");
duke@435	60	_manager_array = NEW_C_HEAP_ARRAY(ParCompactionManager*, parallel_gc_threads+1 );
jcoomes@1746	61	guarantee(_manager_array != NULL, "Could not allocate manager_array");
duke@435	62
duke@435	63	_stack_array = new OopTaskQueueSet(parallel_gc_threads);
jcoomes@1746	64	guarantee(_stack_array != NULL, "Could not allocate stack_array");
jcoomes@1746	65	_objarray_queues = new ObjArrayTaskQueueSet(parallel_gc_threads);
jcoomes@1746	66	guarantee(_objarray_queues != NULL, "Could not allocate objarray_queues");
jcoomes@810	67	_region_array = new RegionTaskQueueSet(parallel_gc_threads);
jcoomes@1746	68	guarantee(_region_array != NULL, "Could not allocate region_array");
duke@435	69
duke@435	70	// Create and register the ParCompactionManager(s) for the worker threads.
duke@435	71	for(uint i=0; i<parallel_gc_threads; i++) {
duke@435	72	_manager_array[i] = new ParCompactionManager();
duke@435	73	guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager");
duke@435	74	stack_array()->register_queue(i, _manager_array[i]->marking_stack());
jcoomes@1993	75	_objarray_queues->register_queue(i, &_manager_array[i]->_objarray_stack);
jcoomes@810	76	region_array()->register_queue(i, _manager_array[i]->region_stack());
duke@435	77	}
duke@435	78
duke@435	79	// The VMThread gets its own ParCompactionManager, which is not available
duke@435	80	// for work stealing.
duke@435	81	_manager_array[parallel_gc_threads] = new ParCompactionManager();
duke@435	82	guarantee(_manager_array[parallel_gc_threads] != NULL,
duke@435	83	"Could not create ParCompactionManager");
duke@435	84	assert(PSParallelCompact::gc_task_manager()->workers() != 0,
duke@435	85	"Not initialized?");
duke@435	86	}
duke@435	87
duke@435	88	bool ParCompactionManager::should_update() {
duke@435	89	assert(action() != NotValid, "Action is not set");
duke@435	90	return (action() == ParCompactionManager::Update) ||
duke@435	91	(action() == ParCompactionManager::CopyAndUpdate) ||
duke@435	92	(action() == ParCompactionManager::UpdateAndCopy);
duke@435	93	}
duke@435	94
duke@435	95	bool ParCompactionManager::should_copy() {
duke@435	96	assert(action() != NotValid, "Action is not set");
duke@435	97	return (action() == ParCompactionManager::Copy) ||
duke@435	98	(action() == ParCompactionManager::CopyAndUpdate) ||
duke@435	99	(action() == ParCompactionManager::UpdateAndCopy);
duke@435	100	}
duke@435	101
duke@435	102	bool ParCompactionManager::should_verify_only() {
duke@435	103	assert(action() != NotValid, "Action is not set");
duke@435	104	return action() == ParCompactionManager::VerifyUpdate;
duke@435	105	}
duke@435	106
duke@435	107	bool ParCompactionManager::should_reset_only() {
duke@435	108	assert(action() != NotValid, "Action is not set");
duke@435	109	return action() == ParCompactionManager::ResetObjects;
duke@435	110	}
duke@435	111
duke@435	112	ParCompactionManager*
duke@435	113	ParCompactionManager::gc_thread_compaction_manager(int index) {
duke@435	114	assert(index >= 0 && index < (int)ParallelGCThreads, "index out of range");
duke@435	115	assert(_manager_array != NULL, "Sanity");
duke@435	116	return _manager_array[index];
duke@435	117	}
duke@435	118
duke@435	119	void ParCompactionManager::reset() {
jcoomes@2191	120	for(uint i = 0; i < ParallelGCThreads + 1; i++) {
jcoomes@2191	121	assert(manager_array(i)->revisit_klass_stack()->is_empty(), "sanity");
jcoomes@2191	122	assert(manager_array(i)->revisit_mdo_stack()->is_empty(), "sanity");
duke@435	123	}
duke@435	124	}
duke@435	125
jcoomes@1746	126	void ParCompactionManager::follow_marking_stacks() {
duke@435	127	do {
jcoomes@1746	128	// Drain the overflow stack first, to allow stealing from the marking stack.
jcoomes@1750	129	oop obj;
jcoomes@1993	130	while (marking_stack()->pop_overflow(obj)) {
jcoomes@1993	131	obj->follow_contents(this);
jcoomes@1746	132	}
jcoomes@1746	133	while (marking_stack()->pop_local(obj)) {
duke@435	134	obj->follow_contents(this);
duke@435	135	}
duke@435	136
jcoomes@1750	137	// Process ObjArrays one at a time to avoid marking stack bloat.
jcoomes@1746	138	ObjArrayTask task;
jcoomes@1993	139	if (_objarray_stack.pop_overflow(task)) {
jcoomes@1746	140	objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
jcoomes@1746	141	k->oop_follow_contents(this, task.obj(), task.index());
jcoomes@1993	142	} else if (_objarray_stack.pop_local(task)) {
jcoomes@1746	143	objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
jcoomes@1746	144	k->oop_follow_contents(this, task.obj(), task.index());
jcoomes@1746	145	}
jcoomes@1746	146	} while (!marking_stacks_empty());
duke@435	147
jcoomes@1746	148	assert(marking_stacks_empty(), "Sanity");
duke@435	149	}
duke@435	150
jcoomes@810	151	void ParCompactionManager::drain_region_stacks() {
duke@435	152	do {
jcoomes@1993	153	// Drain overflow stack first so other threads can steal.
jcoomes@1993	154	size_t region_index;
jcoomes@1993	155	while (region_stack()->pop_overflow(region_index)) {
jcoomes@810	156	PSParallelCompact::fill_and_update_region(this, region_index);
duke@435	157	}
duke@435	158
jcoomes@1993	159	while (region_stack()->pop_local(region_index)) {
jcoomes@810	160	PSParallelCompact::fill_and_update_region(this, region_index);
duke@435	161	}
jcoomes@810	162	} while (!region_stack()->is_empty());
duke@435	163	}