• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp@9766f73e770d (annotated)

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

Fri, 31 May 2013 14:32:44 +0200

author

stefank

date

Fri, 31 May 2013 14:32:44 +0200

changeset 5515

9766f73e770d

parent 4993

746b070f5022

child 6198

55fb97c4c58d

permissions

-rw-r--r--

8022880: False sharing between PSPromotionManager instances
Summary: Pad the PSPromotionManager instances in the manager array.
Reviewed-by: brutisso, jmasa

duke@435	1
duke@435	2	/*
mikael@4153	3	* Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	5	*
duke@435	6	* This code is free software; you can redistribute it and/or modify it
duke@435	7	* under the terms of the GNU General Public License version 2 only, as
duke@435	8	* published by the Free Software Foundation.
duke@435	9	*
duke@435	10	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	13	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	14	* accompanied this code).
duke@435	15	*
duke@435	16	* You should have received a copy of the GNU General Public License version
duke@435	17	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	19	*
trims@1907	20	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	21	* or visit www.oracle.com if you need additional information or have any
trims@1907	22	* questions.
duke@435	23	*
duke@435	24	*/
duke@435	25
stefank@2314	26	#include "precompiled.hpp"
stefank@2314	27	#include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
stefank@2314	28	#include "gc_implementation/parallelScavenge/gcTaskThread.hpp"
stefank@2314	29	#include "memory/allocation.hpp"
stefank@2314	30	#include "memory/allocation.inline.hpp"
stefank@2314	31	#include "memory/resourceArea.hpp"
stefank@2314	32	#include "runtime/handles.hpp"
stefank@2314	33	#include "runtime/handles.inline.hpp"
stefank@2314	34	#include "runtime/os.hpp"
stefank@2314	35	#include "runtime/thread.hpp"
duke@435	36
duke@435	37	GCTaskThread::GCTaskThread(GCTaskManager* manager,
duke@435	38	uint which,
duke@435	39	uint processor_id) :
duke@435	40	_manager(manager),
duke@435	41	_processor_id(processor_id),
duke@435	42	_time_stamps(NULL),
duke@435	43	_time_stamp_index(0)
duke@435	44	{
duke@435	45	if (!os::create_thread(this, os::pgc_thread))
ccheung@4993	46	vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
duke@435	47
duke@435	48	if (PrintGCTaskTimeStamps) {
zgu@3900	49	_time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
duke@435	50
duke@435	51	guarantee(_time_stamps != NULL, "Sanity");
duke@435	52	}
duke@435	53	set_id(which);
duke@435	54	set_name("GC task thread#%d (ParallelGC)", which);
duke@435	55	}
duke@435	56
duke@435	57	GCTaskThread::~GCTaskThread() {
duke@435	58	if (_time_stamps != NULL) {
zgu@3900	59	FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps, mtGC);
duke@435	60	}
duke@435	61	}
duke@435	62
duke@435	63	void GCTaskThread::start() {
duke@435	64	os::start_thread(this);
duke@435	65	}
duke@435	66
duke@435	67	GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
duke@435	68	guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
duke@435	69
duke@435	70	return &(_time_stamps[index]);
duke@435	71	}
duke@435	72
duke@435	73	void GCTaskThread::print_task_time_stamps() {
duke@435	74	assert(PrintGCTaskTimeStamps, "Sanity");
duke@435	75	assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)");
duke@435	76
duke@435	77	tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index);
duke@435	78	for(uint i=0; i<_time_stamp_index; i++) {
duke@435	79	GCTaskTimeStamp* time_stamp = time_stamp_at(i);
duke@435	80	tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]",
duke@435	81	time_stamp->name(),
duke@435	82	time_stamp->entry_time(),
duke@435	83	time_stamp->exit_time());
duke@435	84	}
duke@435	85
duke@435	86	// Reset after dumping the data
duke@435	87	_time_stamp_index = 0;
duke@435	88	}
duke@435	89
duke@435	90	void GCTaskThread::print_on(outputStream* st) const {
duke@435	91	st->print("\"%s\" ", name());
duke@435	92	Thread::print_on(st);
duke@435	93	st->cr();
duke@435	94	}
duke@435	95
jmasa@3294	96	// GC workers get tasks from the GCTaskManager and execute
jmasa@3294	97	// them in this method. If there are no tasks to execute,
jmasa@3294	98	// the GC workers wait in the GCTaskManager's get_task()
jmasa@3294	99	// for tasks to be enqueued for execution.
jmasa@3294	100
duke@435	101	void GCTaskThread::run() {
duke@435	102	// Set up the thread for stack overflow support
duke@435	103	this->record_stack_base_and_size();
duke@435	104	this->initialize_thread_local_storage();
duke@435	105	// Bind yourself to your processor.
duke@435	106	if (processor_id() != GCTaskManager::sentinel_worker()) {
duke@435	107	if (TraceGCTaskThread) {
duke@435	108	tty->print_cr("GCTaskThread::run: "
duke@435	109	" binding to processor %u", processor_id());
duke@435	110	}
duke@435	111	if (!os::bind_to_processor(processor_id())) {
duke@435	112	DEBUG_ONLY(
duke@435	113	warning("Couldn't bind GCTaskThread %u to processor %u",
duke@435	114	which(), processor_id());
duke@435	115	)
duke@435	116	}
duke@435	117	}
duke@435	118	// Part of thread setup.
duke@435	119	// ??? Are these set up once here to make subsequent ones fast?
duke@435	120	HandleMark hm_outer;
duke@435	121	ResourceMark rm_outer;
duke@435	122
duke@435	123	TimeStamp timer;
duke@435	124
duke@435	125	for (;/* ever */;) {
duke@435	126	// These are so we can flush the resources allocated in the inner loop.
duke@435	127	HandleMark hm_inner;
duke@435	128	ResourceMark rm_inner;
duke@435	129	for (; /* break */; ) {
duke@435	130	// This will block until there is a task to be gotten.
duke@435	131	GCTask* task = manager()->get_task(which());
jmasa@3328	132	// Record if this is an idle task for later use.
jmasa@3328	133	bool is_idle_task = task->is_idle_task();
duke@435	134	// In case the update is costly
duke@435	135	if (PrintGCTaskTimeStamps) {
duke@435	136	timer.update();
duke@435	137	}
duke@435	138
duke@435	139	jlong entry_time = timer.ticks();
duke@435	140	char* name = task->name();
duke@435	141
jmasa@3328	142	// If this is the barrier task, it can be destroyed
jmasa@3328	143	// by the GC task manager once the do_it() executes.
duke@435	144	task->do_it(manager(), which());
duke@435	145
jmasa@3328	146	// Use the saved value of is_idle_task because references
jmasa@3328	147	// using "task" are not reliable for the barrier task.
jmasa@3328	148	if (!is_idle_task) {
jmasa@3294	149	manager()->note_completion(which());
duke@435	150
jmasa@3294	151	if (PrintGCTaskTimeStamps) {
jmasa@3294	152	assert(_time_stamps != NULL,
jmasa@3294	153	"Sanity (PrintGCTaskTimeStamps set late?)");
duke@435	154
jmasa@3294	155	timer.update();
duke@435	156
jmasa@3294	157	GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
jmasa@3294	158
jmasa@3294	159	time_stamp->set_name(name);
jmasa@3294	160	time_stamp->set_entry_time(entry_time);
jmasa@3294	161	time_stamp->set_exit_time(timer.ticks());
jmasa@3294	162	}
jmasa@3294	163	} else {
jmasa@3294	164	// idle tasks complete outside the normal accounting
jmasa@3294	165	// so that a task can complete without waiting for idle tasks.
jmasa@3294	166	// They have to be terminated separately.
jmasa@3294	167	IdleGCTask::destroy((IdleGCTask*)task);
jmasa@3294	168	set_is_working(true);
duke@435	169	}
duke@435	170
duke@435	171	// Check if we should release our inner resources.
duke@435	172	if (manager()->should_release_resources(which())) {
duke@435	173	manager()->note_release(which());
duke@435	174	break;
duke@435	175	}
duke@435	176	}
duke@435	177	}
duke@435	178	}