Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2002, 2012, 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;

       }

     }

   }

 }