/*

 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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/shared/workerPolicy.hpp"

#include "gc/shenandoah/shenandoahWorkerPolicy.hpp"

#include "runtime/thread.hpp"

uint ShenandoahWorkerPolicy::_prev_par_marking     = 0;

uint ShenandoahWorkerPolicy::_prev_conc_marking    = 0;

uint ShenandoahWorkerPolicy::_prev_conc_evac       = 0;

uint ShenandoahWorkerPolicy::_prev_fullgc          = 0;

uint ShenandoahWorkerPolicy::_prev_degengc         = 0;

uint ShenandoahWorkerPolicy::_prev_stw_traversal   = 0;

uint ShenandoahWorkerPolicy::_prev_conc_traversal  = 0;

uint ShenandoahWorkerPolicy::_prev_conc_update_ref = 0;

uint ShenandoahWorkerPolicy::_prev_par_update_ref  = 0;

uint ShenandoahWorkerPolicy::_prev_conc_cleanup    = 0;

uint ShenandoahWorkerPolicy::_prev_conc_reset      = 0;

uint ShenandoahWorkerPolicy::calc_workers_for_init_marking() {

  uint active_workers = (_prev_par_marking == 0) ? ParallelGCThreads : _prev_par_marking;

  _prev_par_marking =

    WorkerPolicy::calc_active_workers(ParallelGCThreads,

                                      active_workers,

                                      Threads::number_of_non_daemon_threads());

  return _prev_par_marking;

}

uint ShenandoahWorkerPolicy::calc_workers_for_conc_marking() {

  uint active_workers = (_prev_conc_marking == 0) ?  ConcGCThreads : _prev_conc_marking;

  _prev_conc_marking =

    WorkerPolicy::calc_active_conc_workers(ConcGCThreads,

                                           active_workers,

                                           Threads::number_of_non_daemon_threads());

  return _prev_conc_marking;

}

// Reuse the calculation result from init marking

uint ShenandoahWorkerPolicy::calc_workers_for_final_marking() {

  return _prev_par_marking;

}

// Calculate workers for concurrent evacuation (concurrent GC)

uint ShenandoahWorkerPolicy::calc_workers_for_conc_evac() {

  uint active_workers = (_prev_conc_evac == 0) ? ConcGCThreads : _prev_conc_evac;

  _prev_conc_evac =

    WorkerPolicy::calc_active_conc_workers(ConcGCThreads,

                                           active_workers,

                                           Threads::number_of_non_daemon_threads());

  return _prev_conc_evac;

}

// Calculate workers for parallel fullgc

uint ShenandoahWorkerPolicy::calc_workers_for_fullgc() {

  uint active_workers = (_prev_fullgc == 0) ?  ParallelGCThreads : _prev_fullgc;

  _prev_fullgc =

    WorkerPolicy::calc_active_workers(ParallelGCThreads,

                                      active_workers,

                                      Threads::number_of_non_daemon_threads());

  return _prev_fullgc;

}

// Calculate workers for parallel degenerated gc

uint ShenandoahWorkerPolicy::calc_workers_for_stw_degenerated() {

  uint active_workers = (_prev_degengc == 0) ?  ParallelGCThreads : _prev_degengc;

  _prev_degengc =

    WorkerPolicy::calc_active_workers(ParallelGCThreads,

                                      active_workers,

                                      Threads::number_of_non_daemon_threads());

  return _prev_degengc;

}

// Calculate workers for Stop-the-world traversal GC

uint ShenandoahWorkerPolicy::calc_workers_for_stw_traversal() {

  uint active_workers = (_prev_stw_traversal == 0) ? ParallelGCThreads : _prev_stw_traversal;

  _prev_stw_traversal =

    WorkerPolicy::calc_active_workers(ParallelGCThreads,

                                      active_workers,

                                      Threads::number_of_non_daemon_threads());

  return _prev_stw_traversal;

}

// Calculate workers for concurent traversal GC

uint ShenandoahWorkerPolicy::calc_workers_for_conc_traversal() {

  uint active_workers = (_prev_conc_traversal == 0) ? ConcGCThreads : _prev_conc_traversal;

  _prev_conc_traversal =

    WorkerPolicy::calc_active_conc_workers(ConcGCThreads,

                                           active_workers,

                                           Threads::number_of_non_daemon_threads());

  return _prev_conc_traversal;

}

// Calculate workers for concurrent reference update

uint ShenandoahWorkerPolicy::calc_workers_for_conc_update_ref() {

  uint active_workers = (_prev_conc_update_ref == 0) ? ConcGCThreads : _prev_conc_update_ref;

  _prev_conc_update_ref =

    WorkerPolicy::calc_active_conc_workers(ConcGCThreads,

                                           active_workers,

                                           Threads::number_of_non_daemon_threads());

  return _prev_conc_update_ref;

}

// Calculate workers for parallel reference update

uint ShenandoahWorkerPolicy::calc_workers_for_final_update_ref() {

  uint active_workers = (_prev_par_update_ref == 0) ? ParallelGCThreads : _prev_par_update_ref;

  _prev_par_update_ref =

    WorkerPolicy::calc_active_workers(ParallelGCThreads,

                                      active_workers,

                                      Threads::number_of_non_daemon_threads());

  return _prev_par_update_ref;

}

uint ShenandoahWorkerPolicy::calc_workers_for_conc_preclean() {

  // Precleaning is single-threaded

  return 1;

}

uint ShenandoahWorkerPolicy::calc_workers_for_conc_cleanup() {

  uint active_workers = (_prev_conc_cleanup == 0) ? ConcGCThreads : _prev_conc_cleanup;

  _prev_conc_cleanup =

          WorkerPolicy::calc_active_conc_workers(ConcGCThreads,

                                                 active_workers,

                                                 Threads::number_of_non_daemon_threads());

  return _prev_conc_cleanup;

}

uint ShenandoahWorkerPolicy::calc_workers_for_conc_reset() {

  uint active_workers = (_prev_conc_reset == 0) ? ConcGCThreads : _prev_conc_reset;

  _prev_conc_reset =

          WorkerPolicy::calc_active_conc_workers(ConcGCThreads,

                                                 active_workers,

                                                 Threads::number_of_non_daemon_threads());

  return _prev_conc_reset;

}