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

Sat, 07 Mar 2009 11:07:37 -0500

author
tonyp
date
Sat, 07 Mar 2009 11:07:37 -0500
changeset 1054
7ea5ca260b28
parent 777
37f87013dfd8
child 1280
df6caf649ff7
permissions
-rw-r--r--

6814467: G1: small fixes related to concurrent marking verboseness
Summary: A few small fixes to remove some inconsistencies in the concurrent mark-related verbose GC output.
Reviewed-by: jmasa

     1 /*
     2  * Copyright 2001-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
    20  * CA 95054 USA or visit www.sun.com if you need additional information or
    21  * have any questions.
    22  *
    23  */
    25 # include "incls/_precompiled.incl"
    26 # include "incls/_satbQueue.cpp.incl"
    28 void ObjPtrQueue::apply_closure(ObjectClosure* cl) {
    29   if (_buf != NULL) {
    30     apply_closure_to_buffer(cl, _buf, _index, _sz);
    31     _index = _sz;
    32   }
    33 }
    35 void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl,
    36                                           void** buf, size_t index, size_t sz) {
    37   if (cl == NULL) return;
    38   for (size_t i = index; i < sz; i += oopSize) {
    39     oop obj = (oop)buf[byte_index_to_index((int)i)];
    40     // There can be NULL entries because of destructors.
    41     if (obj != NULL) {
    42       cl->do_object(obj);
    43     }
    44   }
    45 }
    46 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
    47 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
    48 #endif // _MSC_VER
    51 SATBMarkQueueSet::SATBMarkQueueSet() :
    52   PtrQueueSet(),
    53   _closure(NULL), _par_closures(NULL),
    54   _shared_satb_queue(this, true /*perm*/)
    55 {}
    57 void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
    58                                   int max_completed_queue,
    59                                   Mutex* lock) {
    60   PtrQueueSet::initialize(cbl_mon, fl_lock, max_completed_queue);
    61   _shared_satb_queue.set_lock(lock);
    62   if (ParallelGCThreads > 0) {
    63     _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads);
    64   }
    65 }
    68 void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) {
    69   t->satb_mark_queue().handle_zero_index();
    70 }
    72 void SATBMarkQueueSet::set_active_all_threads(bool b) {
    73   _all_active = b;
    74   for(JavaThread* t = Threads::first(); t; t = t->next()) {
    75     t->satb_mark_queue().set_active(b);
    76   }
    77 }
    79 void SATBMarkQueueSet::set_closure(ObjectClosure* closure) {
    80   _closure = closure;
    81 }
    83 void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) {
    84   assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition");
    85   _par_closures[i] = par_closure;
    86 }
    88 void SATBMarkQueueSet::iterate_closure_all_threads() {
    89   for(JavaThread* t = Threads::first(); t; t = t->next()) {
    90     t->satb_mark_queue().apply_closure(_closure);
    91   }
    92   shared_satb_queue()->apply_closure(_closure);
    93 }
    95 void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) {
    96   SharedHeap* sh = SharedHeap::heap();
    97   int parity = sh->strong_roots_parity();
    99   for(JavaThread* t = Threads::first(); t; t = t->next()) {
   100     if (t->claim_oops_do(true, parity)) {
   101       t->satb_mark_queue().apply_closure(_par_closures[worker]);
   102     }
   103   }
   104   // We'll have worker 0 do this one.
   105   if (worker == 0) {
   106     shared_satb_queue()->apply_closure(_par_closures[0]);
   107   }
   108 }
   110 bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par,
   111                                                               int worker) {
   112   CompletedBufferNode* nd = NULL;
   113   {
   114     MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
   115     if (_completed_buffers_head != NULL) {
   116       nd = _completed_buffers_head;
   117       _completed_buffers_head = nd->next;
   118       if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL;
   119       _n_completed_buffers--;
   120       if (_n_completed_buffers == 0) _process_completed = false;
   121     }
   122   }
   123   ObjectClosure* cl = (par ? _par_closures[worker] : _closure);
   124   if (nd != NULL) {
   125     ObjPtrQueue::apply_closure_to_buffer(cl, nd->buf, 0, _sz);
   126     deallocate_buffer(nd->buf);
   127     delete nd;
   128     return true;
   129   } else {
   130     return false;
   131   }
   132 }
   134 void SATBMarkQueueSet::abandon_partial_marking() {
   135   CompletedBufferNode* buffers_to_delete = NULL;
   136   {
   137     MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
   138     while (_completed_buffers_head != NULL) {
   139       CompletedBufferNode* nd = _completed_buffers_head;
   140       _completed_buffers_head = nd->next;
   141       nd->next = buffers_to_delete;
   142       buffers_to_delete = nd;
   143     }
   144     _completed_buffers_tail = NULL;
   145     _n_completed_buffers = 0;
   146     debug_only(assert_completed_buffer_list_len_correct_locked());
   147   }
   148   while (buffers_to_delete != NULL) {
   149     CompletedBufferNode* nd = buffers_to_delete;
   150     buffers_to_delete = nd->next;
   151     deallocate_buffer(nd->buf);
   152     delete nd;
   153   }
   154   assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
   155   // So we can safely manipulate these queues.
   156   for (JavaThread* t = Threads::first(); t; t = t->next()) {
   157     t->satb_mark_queue().reset();
   158   }
   159   shared_satb_queue()->reset();
   160 }

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