| |
| /* |
| * Copyright (c) 2002, 2014, 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_implementation/parallelScavenge/gcTaskManager.hpp" |
| #include "gc_implementation/parallelScavenge/gcTaskThread.hpp" |
| #include "memory/allocation.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "runtime/handles.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/thread.hpp" |
| |
| PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| |
| GCTaskThread::GCTaskThread(GCTaskManager* manager, |
| uint which, |
| uint processor_id) : |
| _manager(manager), |
| _processor_id(processor_id), |
| _time_stamps(NULL), |
| _time_stamp_index(0) |
| { |
| if (!os::create_thread(this, os::pgc_thread)) |
| vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources."); |
| |
| if (PrintGCTaskTimeStamps) { |
| _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC); |
| |
| guarantee(_time_stamps != NULL, "Sanity"); |
| } |
| set_id(which); |
| set_name("GC task thread#%d (ParallelGC)", which); |
| } |
| |
| GCTaskThread::~GCTaskThread() { |
| if (_time_stamps != NULL) { |
| FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps, mtGC); |
| } |
| } |
| |
| void GCTaskThread::start() { |
| os::start_thread(this); |
| } |
| |
| GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) { |
| guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries"); |
| |
| return &(_time_stamps[index]); |
| } |
| |
| void GCTaskThread::print_task_time_stamps() { |
| assert(PrintGCTaskTimeStamps, "Sanity"); |
| assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)"); |
| |
| tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index); |
| for(uint i=0; i<_time_stamp_index; i++) { |
| GCTaskTimeStamp* time_stamp = time_stamp_at(i); |
| tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]", |
| time_stamp->name(), |
| time_stamp->entry_time(), |
| time_stamp->exit_time()); |
| } |
| |
| // Reset after dumping the data |
| _time_stamp_index = 0; |
| } |
| |
| void GCTaskThread::print_on(outputStream* st) const { |
| st->print("\"%s\" ", name()); |
| Thread::print_on(st); |
| st->cr(); |
| } |
| |
| // 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() { |
| // Set up the thread for stack overflow support |
| this->record_stack_base_and_size(); |
| this->initialize_thread_local_storage(); |
| // Bind yourself to your processor. |
| if (processor_id() != GCTaskManager::sentinel_worker()) { |
| if (TraceGCTaskThread) { |
| tty->print_cr("GCTaskThread::run: " |
| " binding to processor %u", processor_id()); |
| } |
| if (!os::bind_to_processor(processor_id())) { |
| DEBUG_ONLY( |
| warning("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()); |
| // 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 (PrintGCTaskTimeStamps) { |
| 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 (PrintGCTaskTimeStamps) { |
| assert(_time_stamps != NULL, |
| "Sanity (PrintGCTaskTimeStamps set late?)"); |
| |
| timer.update(); |
| |
| GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++); |
| |
| time_stamp->set_name(name); |
| time_stamp->set_entry_time(entry_time); |
| time_stamp->set_exit_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; |
| } |
| } |
| } |
| } |