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

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+
+/*
+ * Copyright 2002-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_gcTaskThread.cpp.incl"
+
+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 );
+
+    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);
+  }
+}
+
+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();
+}
+
+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());
+
+      // In case the update is costly
+      if (PrintGCTaskTimeStamps) {
+        timer.update();
+      }
+
+      jlong entry_time = timer.ticks();
+      char* name = task->name();
+
+      task->do_it(manager(), which());
+      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());
+      }
+
+      // Check if we should release our inner resources.
+      if (manager()->should_release_resources(which())) {
+        manager()->note_release(which());
+        break;
+      }
+    }
+  }
+}