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/*
* Copyright (c) 2002, 2011, 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"
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, "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;
}
}
}
}
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