// Called with the queue locked and with at least one element
CompileTask* AdvancedThresholdPolicy::select_task(CompileQueue* compile_queue) {
#if INCLUDE_JVMCI
  CompileTask *max_non_jvmci_task = NULL;
#endif
  CompileTask *max_task = NULL;
  Method* max_method = NULL;
  jlong t = os::javaTimeMillis();
  // Iterate through the queue and find a method with a maximum rate.
  for (CompileTask* task = compile_queue->first(); task != NULL;) {
    CompileTask* next_task = task->next();
    Method* method = task->method();
    update_rate(t, method);
    if (max_task == NULL) {
      max_task = task;
      max_method = method;
    } else {
      // If a method has been stale for some time, remove it from the queue.
      if (is_stale(t, TieredCompileTaskTimeout, method) && !is_old(method)) {
        if (PrintTieredEvents) {
          print_event(REMOVE_FROM_QUEUE, method, method, task->osr_bci(), (CompLevel)task->comp_level());
        }
        task->log_task_dequeued("stale");
        compile_queue->remove_and_mark_stale(task);
        method->clear_queued_for_compilation();
        task = next_task;
        continue;
      }

      // Select a method with a higher rate
      if (compare_methods(method, max_method)) {
        max_task = task;
        max_method = method;
      }
    }
    task = next_task;
  }

#if INCLUDE_JVMCI
  if (UseJVMCICompiler) {
    if (max_non_jvmci_task != NULL) {
      max_task = max_non_jvmci_task;
      max_method = max_task->method();
    }
  }
#endif

  if (max_task->comp_level() == CompLevel_full_profile && TieredStopAtLevel > CompLevel_full_profile
      && is_method_profiled(max_method)) {
    max_task->set_comp_level(CompLevel_limited_profile);
    if (PrintTieredEvents) {
      print_event(UPDATE_IN_QUEUE, max_method, max_method, max_task->osr_bci(), (CompLevel)max_task->comp_level());
    }
  }

  return max_task;
}
Example #2
0
// Called with the queue locked and with at least one element
CompileTask* AdvancedThresholdPolicy::select_task(CompileQueue* compile_queue) {
  CompileTask *max_task = NULL;
  methodOop max_method;
  jlong t = os::javaTimeMillis();
  // Iterate through the queue and find a method with a maximum rate.
  for (CompileTask* task = compile_queue->first(); task != NULL;) {
    CompileTask* next_task = task->next();
    methodOop method = (methodOop)JNIHandles::resolve(task->method_handle());
    methodDataOop mdo = method->method_data();
    update_rate(t, method);
    if (max_task == NULL) {
      max_task = task;
      max_method = method;
    } else {
      // If a method has been stale for some time, remove it from the queue.
      if (is_stale(t, TieredCompileTaskTimeout, method) && !is_old(method)) {
        if (PrintTieredEvents) {
          print_event(KILL, method, method, task->osr_bci(), (CompLevel)task->comp_level());
        }
        CompileTaskWrapper ctw(task); // Frees the task
        compile_queue->remove(task);
        method->clear_queued_for_compilation();
        task = next_task;
        continue;
      }

      // Select a method with a higher rate
      if (compare_methods(method, max_method)) {
        max_task = task;
        max_method = method;
      }
    }
    task = next_task;
  }

  if (max_task->comp_level() == CompLevel_full_profile && is_method_profiled(max_method)) {
    max_task->set_comp_level(CompLevel_limited_profile);
    if (PrintTieredEvents) {
      print_event(UPDATE, max_method, max_method, max_task->osr_bci(), (CompLevel)max_task->comp_level());
    }
  }

  return max_task;
}