| /* |
| * Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/parallel/gcTaskManager.hpp" |
| #include "gc/parallel/gcTaskThread.hpp" |
| #include "gc/shared/gcId.hpp" |
| #include "logging/log.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/handles.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/thread.hpp" |
| |
| GCTaskThread::GCTaskThread(GCTaskManager* manager, |
| uint which, |
| uint processor_id) : |
| _manager(manager), |
| _processor_id(processor_id), |
| _time_stamps(NULL), |
| _time_stamp_index(0) |
| { |
| set_id(which); |
| set_name("%s#%d", manager->group_name(), which); |
| } |
| |
| GCTaskThread::~GCTaskThread() { |
| if (_time_stamps != NULL) { |
| FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps); |
| } |
| } |
| |
| void GCTaskThread::add_task_timestamp(const char* name, jlong t_entry, jlong t_exit) { |
| if (_time_stamp_index < GCTaskTimeStampEntries) { |
| GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index); |
| time_stamp->set_name(name); |
| time_stamp->set_entry_time(t_entry); |
| time_stamp->set_exit_time(t_exit); |
| } else { |
| if (_time_stamp_index == GCTaskTimeStampEntries) { |
| log_warning(gc, task, time)("GC-thread %u: Too many timestamps, ignoring future ones. " |
| "Increase GCTaskTimeStampEntries to get more info.", |
| id()); |
| } |
| // Let _time_stamp_index keep counting to give the user an idea about how many |
| // are needed. |
| } |
| _time_stamp_index++; |
| } |
| |
| GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) { |
| assert(index < GCTaskTimeStampEntries, "Precondition"); |
| if (_time_stamps == NULL) { |
| // We allocate the _time_stamps array lazily since logging can be enabled dynamically |
| GCTaskTimeStamp* time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC); |
| if (!Atomic::replace_if_null(time_stamps, &_time_stamps)) { |
| // Someone already setup the time stamps |
| FREE_C_HEAP_ARRAY(GCTaskTimeStamp, time_stamps); |
| } |
| } |
| return &(_time_stamps[index]); |
| } |
| |
| void GCTaskThread::print_task_time_stamps() { |
| assert(log_is_enabled(Debug, gc, task, time), "Sanity"); |
| |
| // Since _time_stamps is now lazily allocated we need to check that it |
| // has in fact been allocated when calling this function. |
| if (_time_stamps != NULL) { |
| log_debug(gc, task, time)("GC-Thread %u entries: %d%s", id(), |
| _time_stamp_index, |
| _time_stamp_index >= GCTaskTimeStampEntries ? " (overflow)" : ""); |
| const uint max_index = MIN2(_time_stamp_index, GCTaskTimeStampEntries); |
| for (uint i = 0; i < max_index; i++) { |
| GCTaskTimeStamp* time_stamp = time_stamp_at(i); |
| log_debug(gc, task, time)("\t[ %s " JLONG_FORMAT " " JLONG_FORMAT " ]", |
| time_stamp->name(), |
| time_stamp->entry_time(), |
| time_stamp->exit_time()); |
| } |
| |
| // Reset after dumping the data |
| _time_stamp_index = 0; |
| } |
| } |
| |
| // GC workers get tasks from the GCTaskManager and execute |
| // them in this method. If there are no tasks to execute, |
| // the GC workers wait in the GCTaskManager's get_task() |
| // for tasks to be enqueued for execution. |
| |
| void GCTaskThread::run() { |
| this->initialize_named_thread(); |
| // Bind yourself to your processor. |
| if (processor_id() != GCTaskManager::sentinel_worker()) { |
| log_trace(gc, task, thread)("GCTaskThread::run: binding to processor %u", processor_id()); |
| if (!os::bind_to_processor(processor_id())) { |
| DEBUG_ONLY( |
| log_warning(gc)("Couldn't bind GCTaskThread %u to processor %u", |
| which(), processor_id()); |
| ) |
| } |
| } |
| // Part of thread setup. |
| // ??? Are these set up once here to make subsequent ones fast? |
| HandleMark hm_outer; |
| ResourceMark rm_outer; |
| |
| TimeStamp timer; |
| |
| for (;/* ever */;) { |
| // These are so we can flush the resources allocated in the inner loop. |
| HandleMark hm_inner; |
| ResourceMark rm_inner; |
| for (; /* break */; ) { |
| // This will block until there is a task to be gotten. |
| GCTask* task = manager()->get_task(which()); |
| GCIdMark gc_id_mark(task->gc_id()); |
| // Record if this is an idle task for later use. |
| bool is_idle_task = task->is_idle_task(); |
| // In case the update is costly |
| if (log_is_enabled(Debug, gc, task, time)) { |
| timer.update(); |
| } |
| |
| jlong entry_time = timer.ticks(); |
| char* name = task->name(); |
| |
| // If this is the barrier task, it can be destroyed |
| // by the GC task manager once the do_it() executes. |
| task->do_it(manager(), which()); |
| |
| // Use the saved value of is_idle_task because references |
| // using "task" are not reliable for the barrier task. |
| if (!is_idle_task) { |
| manager()->note_completion(which()); |
| |
| if (log_is_enabled(Debug, gc, task, time)) { |
| timer.update(); |
| add_task_timestamp(name, entry_time, timer.ticks()); |
| } |
| } else { |
| // idle tasks complete outside the normal accounting |
| // so that a task can complete without waiting for idle tasks. |
| // They have to be terminated separately. |
| IdleGCTask::destroy((IdleGCTask*)task); |
| set_is_working(true); |
| } |
| |
| // Check if we should release our inner resources. |
| if (manager()->should_release_resources(which())) { |
| manager()->note_release(which()); |
| break; |
| } |
| } |
| } |
| } |
