1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,180 @@
1.4 +
1.5 +/*
1.6 + * Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved.
1.7 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.8 + *
1.9 + * This code is free software; you can redistribute it and/or modify it
1.10 + * under the terms of the GNU General Public License version 2 only, as
1.11 + * published by the Free Software Foundation.
1.12 + *
1.13 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.14 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.15 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.16 + * version 2 for more details (a copy is included in the LICENSE file that
1.17 + * accompanied this code).
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License version
1.20 + * 2 along with this work; if not, write to the Free Software Foundation,
1.21 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.22 + *
1.23 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.24 + * or visit www.oracle.com if you need additional information or have any
1.25 + * questions.
1.26 + *
1.27 + */
1.28 +
1.29 +#include "precompiled.hpp"
1.30 +#include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
1.31 +#include "gc_implementation/parallelScavenge/gcTaskThread.hpp"
1.32 +#include "memory/allocation.hpp"
1.33 +#include "memory/allocation.inline.hpp"
1.34 +#include "memory/resourceArea.hpp"
1.35 +#include "runtime/handles.hpp"
1.36 +#include "runtime/handles.inline.hpp"
1.37 +#include "runtime/os.hpp"
1.38 +#include "runtime/thread.hpp"
1.39 +
1.40 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.41 +
1.42 +GCTaskThread::GCTaskThread(GCTaskManager* manager,
1.43 + uint which,
1.44 + uint processor_id) :
1.45 + _manager(manager),
1.46 + _processor_id(processor_id),
1.47 + _time_stamps(NULL),
1.48 + _time_stamp_index(0)
1.49 +{
1.50 + if (!os::create_thread(this, os::pgc_thread))
1.51 + vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
1.52 +
1.53 + if (PrintGCTaskTimeStamps) {
1.54 + _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
1.55 +
1.56 + guarantee(_time_stamps != NULL, "Sanity");
1.57 + }
1.58 + set_id(which);
1.59 + set_name("GC task thread#%d (ParallelGC)", which);
1.60 +}
1.61 +
1.62 +GCTaskThread::~GCTaskThread() {
1.63 + if (_time_stamps != NULL) {
1.64 + FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps, mtGC);
1.65 + }
1.66 +}
1.67 +
1.68 +void GCTaskThread::start() {
1.69 + os::start_thread(this);
1.70 +}
1.71 +
1.72 +GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
1.73 + guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
1.74 +
1.75 + return &(_time_stamps[index]);
1.76 +}
1.77 +
1.78 +void GCTaskThread::print_task_time_stamps() {
1.79 + assert(PrintGCTaskTimeStamps, "Sanity");
1.80 + assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)");
1.81 +
1.82 + tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index);
1.83 + for(uint i=0; i<_time_stamp_index; i++) {
1.84 + GCTaskTimeStamp* time_stamp = time_stamp_at(i);
1.85 + tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]",
1.86 + time_stamp->name(),
1.87 + time_stamp->entry_time(),
1.88 + time_stamp->exit_time());
1.89 + }
1.90 +
1.91 + // Reset after dumping the data
1.92 + _time_stamp_index = 0;
1.93 +}
1.94 +
1.95 +void GCTaskThread::print_on(outputStream* st) const {
1.96 + st->print("\"%s\" ", name());
1.97 + Thread::print_on(st);
1.98 + st->cr();
1.99 +}
1.100 +
1.101 +// GC workers get tasks from the GCTaskManager and execute
1.102 +// them in this method. If there are no tasks to execute,
1.103 +// the GC workers wait in the GCTaskManager's get_task()
1.104 +// for tasks to be enqueued for execution.
1.105 +
1.106 +void GCTaskThread::run() {
1.107 + // Set up the thread for stack overflow support
1.108 + this->record_stack_base_and_size();
1.109 + this->initialize_thread_local_storage();
1.110 + // Bind yourself to your processor.
1.111 + if (processor_id() != GCTaskManager::sentinel_worker()) {
1.112 + if (TraceGCTaskThread) {
1.113 + tty->print_cr("GCTaskThread::run: "
1.114 + " binding to processor %u", processor_id());
1.115 + }
1.116 + if (!os::bind_to_processor(processor_id())) {
1.117 + DEBUG_ONLY(
1.118 + warning("Couldn't bind GCTaskThread %u to processor %u",
1.119 + which(), processor_id());
1.120 + )
1.121 + }
1.122 + }
1.123 + // Part of thread setup.
1.124 + // ??? Are these set up once here to make subsequent ones fast?
1.125 + HandleMark hm_outer;
1.126 + ResourceMark rm_outer;
1.127 +
1.128 + TimeStamp timer;
1.129 +
1.130 + for (;/* ever */;) {
1.131 + // These are so we can flush the resources allocated in the inner loop.
1.132 + HandleMark hm_inner;
1.133 + ResourceMark rm_inner;
1.134 + for (; /* break */; ) {
1.135 + // This will block until there is a task to be gotten.
1.136 + GCTask* task = manager()->get_task(which());
1.137 + // Record if this is an idle task for later use.
1.138 + bool is_idle_task = task->is_idle_task();
1.139 + // In case the update is costly
1.140 + if (PrintGCTaskTimeStamps) {
1.141 + timer.update();
1.142 + }
1.143 +
1.144 + jlong entry_time = timer.ticks();
1.145 + char* name = task->name();
1.146 +
1.147 + // If this is the barrier task, it can be destroyed
1.148 + // by the GC task manager once the do_it() executes.
1.149 + task->do_it(manager(), which());
1.150 +
1.151 + // Use the saved value of is_idle_task because references
1.152 + // using "task" are not reliable for the barrier task.
1.153 + if (!is_idle_task) {
1.154 + manager()->note_completion(which());
1.155 +
1.156 + if (PrintGCTaskTimeStamps) {
1.157 + assert(_time_stamps != NULL,
1.158 + "Sanity (PrintGCTaskTimeStamps set late?)");
1.159 +
1.160 + timer.update();
1.161 +
1.162 + GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
1.163 +
1.164 + time_stamp->set_name(name);
1.165 + time_stamp->set_entry_time(entry_time);
1.166 + time_stamp->set_exit_time(timer.ticks());
1.167 + }
1.168 + } else {
1.169 + // idle tasks complete outside the normal accounting
1.170 + // so that a task can complete without waiting for idle tasks.
1.171 + // They have to be terminated separately.
1.172 + IdleGCTask::destroy((IdleGCTask*)task);
1.173 + set_is_working(true);
1.174 + }
1.175 +
1.176 + // Check if we should release our inner resources.
1.177 + if (manager()->should_release_resources(which())) {
1.178 + manager()->note_release(which());
1.179 + break;
1.180 + }
1.181 + }
1.182 + }
1.183 +}
