jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp@fb69749583e8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp@fb69749583e8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp

Thu, 09 Apr 2015 15:58:49 +0200

author: mlarsson
date: Thu, 09 Apr 2015 15:58:49 +0200
changeset 7686: fb69749583e8
parent 6680: 78bbf4d43a14
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8072621: Clean up around VM_GC_Operations
Reviewed-by: brutisso, jmasa

 /*
  * 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;
       }
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp@fb69749583e8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp