jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp

Mon, 02 Aug 2010 12:51:43 -0700

author: johnc
date: Mon, 02 Aug 2010 12:51:43 -0700
changeset 2060: 2d160770d2e5
parent 1907: c18cbe5936b8
child 2314: f95d63e2154a
permissions: -rw-r--r--

6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp

 /*
  * Copyright (c) 2001, 2007, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * 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
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  */
 #include "incls/_precompiled.incl"
 #include "incls/_g1SATBCardTableModRefBS.cpp.incl"
 G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
                                                  int max_covered_regions) :
     CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
 {
   _kind = G1SATBCT;
 }
 void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
   assert(pre_val->is_oop_or_null(true), "Error");
   if (!JavaThread::satb_mark_queue_set().is_active()) return;
   Thread* thr = Thread::current();
   if (thr->is_Java_thread()) {
     JavaThread* jt = (JavaThread*)thr;
     jt->satb_mark_queue().enqueue(pre_val);
   } else {
     MutexLocker x(Shared_SATB_Q_lock);
     JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
   }
 }
 // When we know the current java thread:
 template <class T> void
 G1SATBCardTableModRefBS::write_ref_field_pre_static(T* field,
                                                     oop new_val,
                                                     JavaThread* jt) {
   if (!JavaThread::satb_mark_queue_set().is_active()) return;
   T heap_oop = oopDesc::load_heap_oop(field);
   if (!oopDesc::is_null(heap_oop)) {
     oop pre_val = oopDesc::decode_heap_oop_not_null(heap_oop);
     assert(pre_val->is_oop(true /* ignore mark word */), "Error");
     jt->satb_mark_queue().enqueue(pre_val);
   }
 }
 template <class T> void
 G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
   if (!JavaThread::satb_mark_queue_set().is_active()) return;
   T* elem_ptr = dst;
   for (int i = 0; i < count; i++, elem_ptr++) {
     T heap_oop = oopDesc::load_heap_oop(elem_ptr);
     if (!oopDesc::is_null(heap_oop)) {
       enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
     }
   }
 }
 G1SATBCardTableLoggingModRefBS::
 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
                                int max_covered_regions) :
   G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
   _dcqs(JavaThread::dirty_card_queue_set())
 {
   _kind = G1SATBCTLogging;
 }
 void
 G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
                                                      oop new_val) {
   jbyte* byte = byte_for(field);
   if (*byte != dirty_card) {
     *byte = dirty_card;
     Thread* thr = Thread::current();
     if (thr->is_Java_thread()) {
       JavaThread* jt = (JavaThread*)thr;
       jt->dirty_card_queue().enqueue(byte);
     } else {
       MutexLockerEx x(Shared_DirtyCardQ_lock,
                       Mutex::_no_safepoint_check_flag);
       _dcqs.shared_dirty_card_queue()->enqueue(byte);
     }
   }
 }
 void
 G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
                                                        oop new_val) {
   uintptr_t field_uint = (uintptr_t)field;
   uintptr_t new_val_uint = (uintptr_t)new_val;
   uintptr_t comb = field_uint ^ new_val_uint;
   comb = comb >> HeapRegion::LogOfHRGrainBytes;
   if (comb == 0) return;
   if (new_val == NULL) return;
   // Otherwise, log it.
   G1SATBCardTableLoggingModRefBS* g1_bs =
     (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
   g1_bs->write_ref_field_work(field, new_val);
 }
 void
 G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
   jbyte* byte = byte_for(mr.start());
   jbyte* last_byte = byte_for(mr.last());
   Thread* thr = Thread::current();
   if (whole_heap) {
     while (byte <= last_byte) {
       *byte = dirty_card;
       byte++;
     }
   } else {
     // Enqueue if necessary.
     if (thr->is_Java_thread()) {
       JavaThread* jt = (JavaThread*)thr;
       while (byte <= last_byte) {
         if (*byte != dirty_card) {
           *byte = dirty_card;
           jt->dirty_card_queue().enqueue(byte);
         }
         byte++;
       }
     } else {
       MutexLockerEx x(Shared_DirtyCardQ_lock,
                       Mutex::_no_safepoint_check_flag);
       while (byte <= last_byte) {
         if (*byte != dirty_card) {
           *byte = dirty_card;
           _dcqs.shared_dirty_card_queue()->enqueue(byte);
         }
         byte++;
       }
     }
   }
 }

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src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp@2d160770d2e5 (annotated)

src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp