1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #include "precompiled.hpp"
  25 
  26 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
  27 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
  28 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
  29 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
  30 
  31 #include "logging/log.hpp"
  32 
  33 ShenandoahWorkerScope::ShenandoahWorkerScope(WorkGang* workers, uint nworkers, const char* msg, bool check) :
  34   _workers(workers) {
  35   assert(msg != NULL, "Missing message");
  36 
  37   _n_workers = _workers->update_active_workers(nworkers);
  38   assert(_n_workers <= nworkers, "Must be");
  39 
  40   log_info(gc, task)("Using %u of %u workers for %s",
  41     _n_workers, ShenandoahHeap::heap()->max_workers(), msg);
  42 
  43   if (check) {
  44     ShenandoahHeap::heap()->assert_gc_workers(_n_workers);
  45   }
  46 }
  47 
  48 ShenandoahWorkerScope::~ShenandoahWorkerScope() {
  49   assert(_workers->active_workers() == _n_workers,
  50     "Active workers can not be changed within this scope");
  51 }
  52 
  53 ShenandoahPushWorkerScope::ShenandoahPushWorkerScope(WorkGang* workers, uint nworkers, bool check) :
  54   _old_workers(workers->active_workers()),
  55   _workers(workers) {
  56   _n_workers = _workers->update_active_workers(nworkers);
  57   assert(_n_workers <= nworkers, "Must be");
  58 
  59   // bypass concurrent/parallel protocol check for non-regular paths, e.g. verifier, etc.
  60   if (check) {
  61     ShenandoahHeap::heap()->assert_gc_workers(_n_workers);
  62   }
  63 }
  64 
  65 ShenandoahPushWorkerScope::~ShenandoahPushWorkerScope() {
  66   assert(_workers->active_workers() == _n_workers,
  67     "Active workers can not be changed within this scope");
  68   // Restore old worker value
  69   uint nworkers = _workers->update_active_workers(_old_workers);
  70   assert(nworkers == _old_workers, "Must be able to restore");
  71 }
  72 
  73 ShenandoahPushWorkerQueuesScope::ShenandoahPushWorkerQueuesScope(WorkGang* workers, ShenandoahObjToScanQueueSet* queues, uint nworkers, bool check) :
  74   ShenandoahPushWorkerScope(workers, nworkers, check), _queues(queues) {
  75   _queues->reserve(_n_workers);
  76 }
  77 
  78 ShenandoahPushWorkerQueuesScope::~ShenandoahPushWorkerQueuesScope() {
  79   // Restore old worker value
  80   _queues->reserve(_old_workers);
  81 }
  82 
  83 AbstractGangWorker* ShenandoahWorkGang::install_worker(uint which) {
  84   AbstractGangWorker* worker = WorkGang::install_worker(which);
  85   ShenandoahThreadLocalData::create(worker);
  86   if (_initialize_gclab) {
  87     ShenandoahThreadLocalData::initialize_gclab(worker);
  88   }
  89   return worker;
  90 }