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, phases) time("Pause Init-Mark", sh->gc_timer());
  41   sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::init_mark);
  42 
  43   assert(sh->is_bitmap_clear(), "need clear marking bitmap");
  44 
  45   if (ShenandoahGCVerbose)
  46     tty->print("vm_ShenandoahInitMark\n");
  47   sh->start_concurrent_marking();
  48   if (UseTLAB) {
  49     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::resize_tlabs);
  50     sh->resize_all_tlabs();
  51     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::resize_tlabs);
  52   }
  53 
  54   sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::init_mark);
  55 
  56 }
  57 
  58 VM_Operation::VMOp_Type VM_ShenandoahFullGC::type() const {
  59   return VMOp_ShenandoahFullGC;
  60 }
  61 
  62 VM_ShenandoahFullGC::VM_ShenandoahFullGC(GCCause::Cause gc_cause) :
  63   _gc_cause(gc_cause) {
  64 }
  65 
  66 void VM_ShenandoahFullGC::doit() {
  67 
  68   ShenandoahMarkCompact::do_mark_compact(_gc_cause);
  69   ShenandoahHeap *sh = ShenandoahHeap::heap();
  70   if (UseTLAB) {
  71     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::resize_tlabs);
  72     sh->resize_all_tlabs();
  73     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::resize_tlabs);
  74   }
  75 }
  76 
  77 const char* VM_ShenandoahFullGC::name() const {
  78   return "Shenandoah Full GC";
  79 }
  80 
  81 
  82 bool VM_ShenandoahReferenceOperation::doit_prologue() {
  83   _pending_list_locker.lock();
  84   return true;
  85 }
  86 
  87 void VM_ShenandoahReferenceOperation::doit_epilogue() {
  88   _pending_list_locker.unlock();
  89 }
  90 
  91 void VM_ShenandoahStartEvacuation::doit() {
  92 
  93   // We need to do the finish mark here, so that a JNI critical region
  94   // can't divide it from evacuation start. 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     if (ShenandoahGCVerbose)
 100       tty->print("vm_ShenandoahFinalMark\n");
 101 
 102     GCTraceTime(Info, gc, phases) time("Pause Init-Evacuation", sh->gc_timer());
 103     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::final_mark);
 104     sh->concurrentMark()->finish_mark_from_roots();
 105     sh->stop_concurrent_marking();
 106     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::final_mark);
 107 
 108     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::prepare_evac);
 109     sh->prepare_for_concurrent_evacuation();
 110     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::prepare_evac);
 111 
 112     sh->set_evacuation_in_progress(true);
 113 
 114     // From here on, we need to update references.
 115     sh->set_need_update_refs(true);
 116 
 117     sh->shenandoahPolicy()->record_phase_start(ShenandoahCollectorPolicy::init_evac);
 118     sh->evacuate_and_update_roots();
 119     sh->shenandoahPolicy()->record_phase_end(ShenandoahCollectorPolicy::init_evac);
 120 
 121   } else {
 122     sh->concurrentMark()->cancel();
 123     sh->stop_concurrent_marking();
 124     sh->recycle_dirty_regions();
 125   }
 126 }
 127 
 128 VM_Operation::VMOp_Type VM_ShenandoahStartEvacuation::type() const {
 129   return VMOp_ShenandoahStartEvacuation;
 130 }
 131 
 132 const char* VM_ShenandoahStartEvacuation::name() const {
 133   return "Start shenandoah evacuation";
 134 }
 135 
 136 VM_Operation::VMOp_Type VM_ShenandoahVerifyHeapAfterEvacuation::type() const {
 137   return VMOp_ShenandoahVerifyHeapAfterEvacuation;
 138 }
 139 
 140 const char* VM_ShenandoahVerifyHeapAfterEvacuation::name() const {
 141   return "Shenandoah verify heap after evacuation";
 142 }
 143 
 144 void VM_ShenandoahVerifyHeapAfterEvacuation::doit() {
 145 
 146   ShenandoahHeap *sh = ShenandoahHeap::heap();
 147   sh->verify_heap_after_evacuation();
 148 
 149 }