duke@435: 
duke@435: /*
mikael@4153:  * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/gcTaskThread.hpp"
stefank@2314: #include "memory/allocation.hpp"
stefank@2314: #include "memory/allocation.inline.hpp"
stefank@2314: #include "memory/resourceArea.hpp"
stefank@2314: #include "runtime/handles.hpp"
stefank@2314: #include "runtime/handles.inline.hpp"
stefank@2314: #include "runtime/os.hpp"
stefank@2314: #include "runtime/thread.hpp"
duke@435: 
duke@435: GCTaskThread::GCTaskThread(GCTaskManager* manager,
duke@435:                            uint           which,
duke@435:                            uint           processor_id) :
duke@435:   _manager(manager),
duke@435:   _processor_id(processor_id),
duke@435:   _time_stamps(NULL),
duke@435:   _time_stamp_index(0)
duke@435: {
duke@435:   if (!os::create_thread(this, os::pgc_thread))
ccheung@4993:     vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources.");
duke@435: 
duke@435:   if (PrintGCTaskTimeStamps) {
zgu@3900:     _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC);
duke@435: 
duke@435:     guarantee(_time_stamps != NULL, "Sanity");
duke@435:   }
duke@435:   set_id(which);
duke@435:   set_name("GC task thread#%d (ParallelGC)", which);
duke@435: }
duke@435: 
duke@435: GCTaskThread::~GCTaskThread() {
duke@435:   if (_time_stamps != NULL) {
zgu@3900:     FREE_C_HEAP_ARRAY(GCTaskTimeStamp, _time_stamps, mtGC);
duke@435:   }
duke@435: }
duke@435: 
duke@435: void GCTaskThread::start() {
duke@435:   os::start_thread(this);
duke@435: }
duke@435: 
duke@435: GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) {
duke@435:   guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries");
duke@435: 
duke@435:   return &(_time_stamps[index]);
duke@435: }
duke@435: 
duke@435: void GCTaskThread::print_task_time_stamps() {
duke@435:   assert(PrintGCTaskTimeStamps, "Sanity");
duke@435:   assert(_time_stamps != NULL, "Sanity (Probably set PrintGCTaskTimeStamps late)");
duke@435: 
duke@435:   tty->print_cr("GC-Thread %u entries: %d", id(), _time_stamp_index);
duke@435:   for(uint i=0; i<_time_stamp_index; i++) {
duke@435:     GCTaskTimeStamp* time_stamp = time_stamp_at(i);
duke@435:     tty->print_cr("\t[ %s " INT64_FORMAT " " INT64_FORMAT " ]",
duke@435:                   time_stamp->name(),
duke@435:                   time_stamp->entry_time(),
duke@435:                   time_stamp->exit_time());
duke@435:   }
duke@435: 
duke@435:   // Reset after dumping the data
duke@435:   _time_stamp_index = 0;
duke@435: }
duke@435: 
duke@435: void GCTaskThread::print_on(outputStream* st) const {
duke@435:   st->print("\"%s\" ", name());
duke@435:   Thread::print_on(st);
duke@435:   st->cr();
duke@435: }
duke@435: 
jmasa@3294: // GC workers get tasks from the GCTaskManager and execute
jmasa@3294: // them in this method.  If there are no tasks to execute,
jmasa@3294: // the GC workers wait in the GCTaskManager's get_task()
jmasa@3294: // for tasks to be enqueued for execution.
jmasa@3294: 
duke@435: void GCTaskThread::run() {
duke@435:   // Set up the thread for stack overflow support
duke@435:   this->record_stack_base_and_size();
duke@435:   this->initialize_thread_local_storage();
duke@435:   // Bind yourself to your processor.
duke@435:   if (processor_id() != GCTaskManager::sentinel_worker()) {
duke@435:     if (TraceGCTaskThread) {
duke@435:       tty->print_cr("GCTaskThread::run: "
duke@435:                     "  binding to processor %u", processor_id());
duke@435:     }
duke@435:     if (!os::bind_to_processor(processor_id())) {
duke@435:       DEBUG_ONLY(
duke@435:         warning("Couldn't bind GCTaskThread %u to processor %u",
duke@435:                       which(), processor_id());
duke@435:       )
duke@435:     }
duke@435:   }
duke@435:   // Part of thread setup.
duke@435:   // ??? Are these set up once here to make subsequent ones fast?
duke@435:   HandleMark   hm_outer;
duke@435:   ResourceMark rm_outer;
duke@435: 
duke@435:   TimeStamp timer;
duke@435: 
duke@435:   for (;/* ever */;) {
duke@435:     // These are so we can flush the resources allocated in the inner loop.
duke@435:     HandleMark   hm_inner;
duke@435:     ResourceMark rm_inner;
duke@435:     for (; /* break */; ) {
duke@435:       // This will block until there is a task to be gotten.
duke@435:       GCTask* task = manager()->get_task(which());
jmasa@3328:       // Record if this is an idle task for later use.
jmasa@3328:       bool is_idle_task = task->is_idle_task();
duke@435:       // In case the update is costly
duke@435:       if (PrintGCTaskTimeStamps) {
duke@435:         timer.update();
duke@435:       }
duke@435: 
duke@435:       jlong entry_time = timer.ticks();
duke@435:       char* name = task->name();
duke@435: 
jmasa@3328:       // If this is the barrier task, it can be destroyed
jmasa@3328:       // by the GC task manager once the do_it() executes.
duke@435:       task->do_it(manager(), which());
duke@435: 
jmasa@3328:       // Use the saved value of is_idle_task because references
jmasa@3328:       // using "task" are not reliable for the barrier task.
jmasa@3328:       if (!is_idle_task) {
jmasa@3294:         manager()->note_completion(which());
duke@435: 
jmasa@3294:         if (PrintGCTaskTimeStamps) {
jmasa@3294:           assert(_time_stamps != NULL,
jmasa@3294:             "Sanity (PrintGCTaskTimeStamps set late?)");
duke@435: 
jmasa@3294:           timer.update();
duke@435: 
jmasa@3294:           GCTaskTimeStamp* time_stamp = time_stamp_at(_time_stamp_index++);
jmasa@3294: 
jmasa@3294:           time_stamp->set_name(name);
jmasa@3294:           time_stamp->set_entry_time(entry_time);
jmasa@3294:           time_stamp->set_exit_time(timer.ticks());
jmasa@3294:         }
jmasa@3294:       } else {
jmasa@3294:         // idle tasks complete outside the normal accounting
jmasa@3294:         // so that a task can complete without waiting for idle tasks.
jmasa@3294:         // They have to be terminated separately.
jmasa@3294:         IdleGCTask::destroy((IdleGCTask*)task);
jmasa@3294:         set_is_working(true);
duke@435:       }
duke@435: 
duke@435:       // Check if we should release our inner resources.
duke@435:       if (manager()->should_release_resources(which())) {
duke@435:         manager()->note_release(which());
duke@435:         break;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }