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

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

src/share/vm/gc_implementation/g1/satbQueue.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
  * questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_satbQueue.cpp.incl"
 void ObjPtrQueue::apply_closure(ObjectClosure* cl) {
   if (_buf != NULL) {
     apply_closure_to_buffer(cl, _buf, _index, _sz);
     _index = _sz;
   }
 }
 void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl,
                                           void** buf, size_t index, size_t sz) {
   if (cl == NULL) return;
   for (size_t i = index; i < sz; i += oopSize) {
     oop obj = (oop)buf[byte_index_to_index((int)i)];
     // There can be NULL entries because of destructors.
     if (obj != NULL) {
       cl->do_object(obj);
     }
   }
 }
 #ifdef ASSERT
 void ObjPtrQueue::verify_oops_in_buffer() {
   if (_buf == NULL) return;
   for (size_t i = _index; i < _sz; i += oopSize) {
     oop obj = (oop)_buf[byte_index_to_index((int)i)];
     assert(obj != NULL && obj->is_oop(true /* ignore mark word */),
            "Not an oop");
   }
 }
 #endif
 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
 #endif // _MSC_VER
 SATBMarkQueueSet::SATBMarkQueueSet() :
   PtrQueueSet(),
   _closure(NULL), _par_closures(NULL),
   _shared_satb_queue(this, true /*perm*/)
 {}
 void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
                                   int process_completed_threshold,
                                   Mutex* lock) {
   PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1);
   _shared_satb_queue.set_lock(lock);
   if (ParallelGCThreads > 0) {
     _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads);
   }
 }
 void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) {
   DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();)
   t->satb_mark_queue().handle_zero_index();
 }
 #ifdef ASSERT
 void SATBMarkQueueSet::dump_active_values(JavaThread* first,
                                           bool expected_active) {
   gclog_or_tty->print_cr("SATB queue active values for Java Threads");
   gclog_or_tty->print_cr(" SATB queue set: active is %s",
                          (is_active()) ? "TRUE" : "FALSE");
   gclog_or_tty->print_cr(" expected_active is %s",
                          (expected_active) ? "TRUE" : "FALSE");
   for (JavaThread* t = first; t; t = t->next()) {
     bool active = t->satb_mark_queue().is_active();
     gclog_or_tty->print_cr("  thread %s, active is %s",
                            t->name(), (active) ? "TRUE" : "FALSE");
   }
 }
 #endif // ASSERT
 void SATBMarkQueueSet::set_active_all_threads(bool b,
                                               bool expected_active) {
   assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
   JavaThread* first = Threads::first();
 #ifdef ASSERT
   if (_all_active != expected_active) {
     dump_active_values(first, expected_active);
     // I leave this here as a guarantee, instead of an assert, so
     // that it will still be compiled in if we choose to uncomment
     // the #ifdef ASSERT in a product build. The whole block is
     // within an #ifdef ASSERT so the guarantee will not be compiled
     // in a product build anyway.
     guarantee(false,
               "SATB queue set has an unexpected active value");
   }
 #endif // ASSERT
   _all_active = b;
   for (JavaThread* t = first; t; t = t->next()) {
 #ifdef ASSERT
     bool active = t->satb_mark_queue().is_active();
     if (active != expected_active) {
       dump_active_values(first, expected_active);
       // I leave this here as a guarantee, instead of an assert, so
       // that it will still be compiled in if we choose to uncomment
       // the #ifdef ASSERT in a product build. The whole block is
       // within an #ifdef ASSERT so the guarantee will not be compiled
       // in a product build anyway.
       guarantee(false,
                 "thread has an unexpected active value in its SATB queue");
     }
 #endif // ASSERT
     t->satb_mark_queue().set_active(b);
   }
 }
 void SATBMarkQueueSet::set_closure(ObjectClosure* closure) {
   _closure = closure;
 }
 void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) {
   assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition");
   _par_closures[i] = par_closure;
 }
 void SATBMarkQueueSet::iterate_closure_all_threads() {
   for(JavaThread* t = Threads::first(); t; t = t->next()) {
     t->satb_mark_queue().apply_closure(_closure);
   }
   shared_satb_queue()->apply_closure(_closure);
 }
 void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) {
   SharedHeap* sh = SharedHeap::heap();
   int parity = sh->strong_roots_parity();
   for(JavaThread* t = Threads::first(); t; t = t->next()) {
     if (t->claim_oops_do(true, parity)) {
       t->satb_mark_queue().apply_closure(_par_closures[worker]);
     }
   }
   // We'll have worker 0 do this one.
   if (worker == 0) {
     shared_satb_queue()->apply_closure(_par_closures[0]);
   }
 }
 bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par,
                                                               int worker) {
   BufferNode* nd = NULL;
   {
     MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
     if (_completed_buffers_head != NULL) {
       nd = _completed_buffers_head;
       _completed_buffers_head = nd->next();
       if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL;
       _n_completed_buffers--;
       if (_n_completed_buffers == 0) _process_completed = false;
     }
   }
   ObjectClosure* cl = (par ? _par_closures[worker] : _closure);
   if (nd != NULL) {
     void **buf = BufferNode::make_buffer_from_node(nd);
     ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz);
     deallocate_buffer(buf);
     return true;
   } else {
     return false;
   }
 }
 void SATBMarkQueueSet::abandon_partial_marking() {
   BufferNode* buffers_to_delete = NULL;
   {
     MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
     while (_completed_buffers_head != NULL) {
       BufferNode* nd = _completed_buffers_head;
       _completed_buffers_head = nd->next();
       nd->set_next(buffers_to_delete);
       buffers_to_delete = nd;
     }
     _completed_buffers_tail = NULL;
     _n_completed_buffers = 0;
     DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked());
   }
   while (buffers_to_delete != NULL) {
     BufferNode* nd = buffers_to_delete;
     buffers_to_delete = nd->next();
     deallocate_buffer(BufferNode::make_buffer_from_node(nd));
   }
   assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
   // So we can safely manipulate these queues.
   for (JavaThread* t = Threads::first(); t; t = t->next()) {
     t->satb_mark_queue().reset();
   }
   shared_satb_queue()->reset();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

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

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