1 /*
   2  * Copyright (c) 2013, 2015, Red Hat, Inc. and/or its affiliates.
   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 "gc/shared/gcTraceTime.inline.hpp"
  25 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
  26 #include "gc/shenandoah/shenandoahMarkCompact.hpp"
  27 #include "gc/shenandoah/vm_operations_shenandoah.hpp"
  28 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
  29 
  30 VM_Operation::VMOp_Type VM_ShenandoahInitMark::type() const {
  31   return VMOp_ShenandoahInitMark;
  32 }
  33 
  34 const char* VM_ShenandoahInitMark::name() const {
  35   return "Shenandoah Initial Marking";
  36 }
  37 
  38 void VM_ShenandoahInitMark::doit() {
  39   ShenandoahHeap *sh = (ShenandoahHeap*) Universe::heap();
  40   GCTraceTime(Info, gc) time("Pause Init-Mark", sh->gc_timer());
  41   sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::init_mark);
  42 
  43   assert(sh->is_next_bitmap_clear(), "need clear marking bitmap");
  44 
  45   sh->start_concurrent_marking();
  46   if (UseTLAB) {
  47     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::resize_tlabs);
  48     sh->resize_all_tlabs();
  49     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::resize_tlabs);
  50   }
  51 
  52   sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::init_mark);
  53 
  54 }
  55 
  56 VM_Operation::VMOp_Type VM_ShenandoahFullGC::type() const {
  57   return VMOp_ShenandoahFullGC;
  58 }
  59 
  60 VM_ShenandoahFullGC::VM_ShenandoahFullGC(GCCause::Cause gc_cause) :
  61   _gc_cause(gc_cause) {
  62 }
  63 
  64 void VM_ShenandoahFullGC::doit() {
  65 
  66   ShenandoahMarkCompact::do_mark_compact(_gc_cause);
  67   ShenandoahHeap *sh = ShenandoahHeap::heap();
  68   if (UseTLAB) {
  69     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::resize_tlabs);
  70     sh->resize_all_tlabs();
  71     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::resize_tlabs);
  72   }
  73 }
  74 
  75 const char* VM_ShenandoahFullGC::name() const {
  76   return "Shenandoah Full GC";
  77 }
  78 
  79 
  80 bool VM_ShenandoahReferenceOperation::doit_prologue() {
  81   Heap_lock->lock();
  82   return true;
  83 }
  84 
  85 void VM_ShenandoahReferenceOperation::doit_epilogue() {
  86   if (Universe::has_reference_pending_list()) {
  87     Heap_lock->notify_all();
  88   }
  89   Heap_lock->unlock();
  90 }
  91 
  92 void VM_ShenandoahStartEvacuation::doit() {
  93 
  94   // It is critical that we
  95   // evacuate roots right after finishing marking, so that we don't
  96   // get unmarked objects in the roots.
  97   ShenandoahHeap *sh = ShenandoahHeap::heap();
  98   if (! sh->cancelled_concgc()) {
  99     GCTraceTime(Info, gc) time("Pause Final Mark", sh->gc_timer(), GCCause::_no_gc, true);
 100     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::final_mark);
 101     sh->concurrentMark()->finish_mark_from_roots();
 102     sh->stop_concurrent_marking();
 103     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::final_mark);
 104 
 105     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::prepare_evac);
 106     sh->prepare_for_concurrent_evacuation();
 107     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::prepare_evac);
 108 
 109     sh->set_evacuation_in_progress(true);
 110 
 111     // From here on, we need to update references.
 112     sh->set_need_update_refs(true);
 113 
 114     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::init_evac);
 115     sh->evacuate_and_update_roots();
 116     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::init_evac);
 117 
 118   } else {
 119     GCTraceTime(Info, gc) time("Cancel concurrent Mark", sh->gc_timer(), GCCause::_no_gc, true);
 120     sh->concurrentMark()->cancel();
 121     sh->stop_concurrent_marking();
 122   }
 123 }
 124 
 125 VM_Operation::VMOp_Type VM_ShenandoahStartEvacuation::type() const {
 126   return VMOp_ShenandoahStartEvacuation;
 127 }
 128 
 129 const char* VM_ShenandoahStartEvacuation::name() const {
 130   return "Start shenandoah evacuation";
 131 }
 132 
 133 VM_Operation::VMOp_Type VM_ShenandoahVerifyHeapAfterEvacuation::type() const {
 134   return VMOp_ShenandoahVerifyHeapAfterEvacuation;
 135 }
 136 
 137 const char* VM_ShenandoahVerifyHeapAfterEvacuation::name() const {
 138   return "Shenandoah verify heap after evacuation";
 139 }
 140 
 141 void VM_ShenandoahVerifyHeapAfterEvacuation::doit() {
 142 
 143   ShenandoahHeap *sh = ShenandoahHeap::heap();
 144   sh->verify_heap_after_evacuation();
 145 
 146 }