rev 53862 : [mq]: java_attach_protocol
rev 53863 : imported patch njt_attach_protocol
rev 53866 : imported patch use_njt_queues
rev 53869 : [mq]: merge_attach

   1 /*
   2  * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/g1/g1BarrierSet.inline.hpp"
  27 #include "gc/g1/g1BarrierSetAssembler.hpp"
  28 #include "gc/g1/g1CardTable.inline.hpp"
  29 #include "gc/g1/g1CollectedHeap.inline.hpp"
  30 #include "gc/g1/g1SATBMarkQueueSet.hpp"
  31 #include "gc/g1/g1ThreadLocalData.hpp"
  32 #include "gc/g1/heapRegion.hpp"
  33 #include "gc/shared/satbMarkQueue.hpp"
  34 #include "logging/log.hpp"
  35 #include "oops/access.inline.hpp"
  36 #include "oops/compressedOops.inline.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "runtime/interfaceSupport.inline.hpp"
  39 #include "runtime/mutexLocker.hpp"
  40 #include "runtime/thread.inline.hpp"
  41 #include "utilities/macros.hpp"
  42 #ifdef COMPILER1
  43 #include "gc/g1/c1/g1BarrierSetC1.hpp"
  44 #endif
  45 #ifdef COMPILER2
  46 #include "gc/g1/c2/g1BarrierSetC2.hpp"
  47 #endif
  48 
  49 class G1BarrierSetC1;
  50 class G1BarrierSetC2;
  51 
  52 G1BarrierSet::G1BarrierSet(G1CardTable* card_table) :
  53   CardTableBarrierSet(make_barrier_set_assembler<G1BarrierSetAssembler>(),
  54                       make_barrier_set_c1<G1BarrierSetC1>(),
  55                       make_barrier_set_c2<G1BarrierSetC2>(),
  56                       card_table,
  57                       BarrierSet::FakeRtti(BarrierSet::G1BarrierSet)),
  58   _satb_mark_queue_buffer_allocator("SATB Buffer Allocator", G1SATBBufferSize),
  59   _dirty_card_queue_buffer_allocator("DC Buffer Allocator", G1UpdateBufferSize),
  60   _satb_mark_queue_set(),
  61   _dirty_card_queue_set()
  62 {}
  63 
  64 void G1BarrierSet::enqueue(oop pre_val) {
  65   // Nulls should have been already filtered.
  66   assert(oopDesc::is_oop(pre_val, true), "Error");
  67 
  68   G1SATBMarkQueueSet& queue_set = satb_mark_queue_set();
  69   if (!queue_set.is_active()) {
  70     return;
  71   }
  72   Thread* thr = Thread::current();
  73   if (thr->is_Java_thread()) {
  74     G1ThreadLocalData::satb_mark_queue(thr).enqueue(pre_val);
  75   } else {
  76     MutexLockerEx x(Shared_SATB_Q_lock, Mutex::_no_safepoint_check_flag);
  77     queue_set.shared_satb_queue()->enqueue(pre_val);
  78   }
  79 }
  80 
  81 template <class T> void
  82 G1BarrierSet::write_ref_array_pre_work(T* dst, size_t count) {
  83   if (!_satb_mark_queue_set.is_active()) return;
  84   T* elem_ptr = dst;
  85   for (size_t i = 0; i < count; i++, elem_ptr++) {
  86     T heap_oop = RawAccess<>::oop_load(elem_ptr);
  87     if (!CompressedOops::is_null(heap_oop)) {
  88       enqueue(CompressedOops::decode_not_null(heap_oop));
  89     }
  90   }
  91 }
  92 
  93 void G1BarrierSet::write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized) {
  94   if (!dest_uninitialized) {
  95     write_ref_array_pre_work(dst, count);
  96   }
  97 }
  98 
  99 void G1BarrierSet::write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized) {
 100   if (!dest_uninitialized) {
 101     write_ref_array_pre_work(dst, count);
 102   }
 103 }
 104 
 105 void G1BarrierSet::write_ref_field_post_slow(volatile jbyte* byte) {
 106   // In the slow path, we know a card is not young
 107   assert(*byte != G1CardTable::g1_young_card_val(), "slow path invoked without filtering");
 108   OrderAccess::storeload();
 109   if (*byte != G1CardTable::dirty_card_val()) {
 110     *byte = G1CardTable::dirty_card_val();
 111     Thread* thr = Thread::current();
 112     if (thr->is_Java_thread()) {
 113       G1ThreadLocalData::dirty_card_queue(thr).enqueue(byte);
 114     } else {
 115       MutexLockerEx x(Shared_DirtyCardQ_lock,
 116                       Mutex::_no_safepoint_check_flag);
 117       _dirty_card_queue_set.shared_dirty_card_queue()->enqueue(byte);
 118     }
 119   }
 120 }
 121 
 122 void G1BarrierSet::invalidate(MemRegion mr) {
 123   if (mr.is_empty()) {
 124     return;
 125   }
 126   volatile jbyte* byte = _card_table->byte_for(mr.start());
 127   jbyte* last_byte = _card_table->byte_for(mr.last());
 128   Thread* thr = Thread::current();
 129     // skip all consecutive young cards
 130   for (; byte <= last_byte && *byte == G1CardTable::g1_young_card_val(); byte++);
 131 
 132   if (byte <= last_byte) {
 133     OrderAccess::storeload();
 134     // Enqueue if necessary.
 135     if (thr->is_Java_thread()) {
 136       for (; byte <= last_byte; byte++) {
 137         if (*byte == G1CardTable::g1_young_card_val()) {
 138           continue;
 139         }
 140         if (*byte != G1CardTable::dirty_card_val()) {
 141           *byte = G1CardTable::dirty_card_val();
 142           G1ThreadLocalData::dirty_card_queue(thr).enqueue(byte);
 143         }
 144       }
 145     } else {
 146       MutexLockerEx x(Shared_DirtyCardQ_lock,
 147                       Mutex::_no_safepoint_check_flag);
 148       for (; byte <= last_byte; byte++) {
 149         if (*byte == G1CardTable::g1_young_card_val()) {
 150           continue;
 151         }
 152         if (*byte != G1CardTable::dirty_card_val()) {
 153           *byte = G1CardTable::dirty_card_val();
 154           _dirty_card_queue_set.shared_dirty_card_queue()->enqueue(byte);
 155         }
 156       }
 157     }
 158   }
 159 }
 160 
 161 void G1BarrierSet::on_thread_create(Thread* thread) {
 162   // Create thread local data
 163   G1ThreadLocalData::create(thread);
 164 }
 165 
 166 void G1BarrierSet::on_thread_destroy(Thread* thread) {
 167   // Destroy thread local data
 168   G1ThreadLocalData::destroy(thread);
 169 }
 170 
 171 void G1BarrierSet::on_thread_attach(JavaThread* thread) {
 172   // This method initializes the SATB and dirty card queues before a
 173   // JavaThread is added to the Java thread list. Right now, we don't
 174   // have to do anything to the dirty card queue (it should have been
 175   // activated when the thread was created), but we have to activate
 176   // the SATB queue if the thread is created while a marking cycle is
 177   // in progress. The activation / de-activation of the SATB queues at
 178   // the beginning / end of a marking cycle is done during safepoints
 179   // so we have to make sure this method is called outside one to be
 180   // able to safely read the active field of the SATB queue set. Right
 181   // now, it is called just before the thread is added to the Java
 182   // thread list in the Threads::add() method. That method is holding
 183   // the Threads_lock which ensures we are outside a safepoint. We
 184   // cannot do the obvious and set the active field of the SATB queue
 185   // when the thread is created given that, in some cases, safepoints
 186   // might happen between the JavaThread constructor being called and the
 187   // thread being added to the Java thread list (an example of this is
 188   // when the structure for the DestroyJavaVM thread is created).
 189   assert(!SafepointSynchronize::is_at_safepoint(), "We should not be at a safepoint");
 190   assert(!G1ThreadLocalData::satb_mark_queue(thread).is_active(), "SATB queue should not be active");
 191   assert(G1ThreadLocalData::satb_mark_queue(thread).is_empty(), "SATB queue should be empty");
 192   assert(G1ThreadLocalData::dirty_card_queue(thread).is_active(), "Dirty card queue should be active");



 193 
 194   // If we are creating the thread during a marking cycle, we should
 195   // set the active field of the SATB queue to true.
 196   if (_satb_mark_queue_set.is_active()) {
 197     G1ThreadLocalData::satb_mark_queue(thread).set_active(true);
 198   }

















 199 }
 200 
 201 void G1BarrierSet::on_thread_detach(JavaThread* thread) {
 202   // Flush any deferred card marks, SATB buffers and dirty card queue buffers
 203   CardTableBarrierSet::on_thread_detach(thread);
 204   G1ThreadLocalData::satb_mark_queue(thread).flush();
 205   G1ThreadLocalData::dirty_card_queue(thread).flush();
 206 }
 207 
 208 BufferNode::Allocator& G1BarrierSet::satb_mark_queue_buffer_allocator() {
 209   return _satb_mark_queue_buffer_allocator;
 210 }
 211 
 212 BufferNode::Allocator& G1BarrierSet::dirty_card_queue_buffer_allocator() {
 213   return _dirty_card_queue_buffer_allocator;
 214 }
--- EOF ---