jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp@4f360ec815ba (annotated)

src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp@4f360ec815ba (annotated)

src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp

Fri, 06 Mar 2009 13:50:14 -0800

author: iveresov
date: Fri, 06 Mar 2009 13:50:14 -0800
changeset 1051: 4f360ec815ba
parent 777: 37f87013dfd8
child 1525: fa357420e7d2
permissions: -rw-r--r--

6720309: G1: don't synchronously update RSet during evacuation pauses
6720334: G1: don't update RSets of collection set regions during an evacuation pause
Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause
Reviewed-by: apetrusenko, tonyp

 /*
  * Copyright 2001-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 class FreeIdSet;
 // A closure class for processing card table entries.  Note that we don't
 // require these closure objects to be stack-allocated.
 class CardTableEntryClosure: public CHeapObj {
 public:
   // Process the card whose card table entry is "card_ptr".  If returns
   // "false", terminate the iteration early.
   virtual bool do_card_ptr(jbyte* card_ptr, int worker_i = 0) = 0;
 };
 // A ptrQueue whose elements are "oops", pointers to object heads.
 class DirtyCardQueue: public PtrQueue {
 public:
   DirtyCardQueue(PtrQueueSet* qset_, bool perm = false) :
     PtrQueue(qset_, perm)
   {
     // Dirty card queues are always active.
     _active = true;
   }
   // Apply the closure to all elements, and reset the index to make the
   // buffer empty.  If a closure application returns "false", return
   // "false" immediately, halting the iteration.  If "consume" is true,
   // deletes processed entries from logs.
   bool apply_closure(CardTableEntryClosure* cl,
                      bool consume = true,
                      size_t worker_i = 0);
   // Apply the closure to all elements of "buf", down to "index"
   // (inclusive.)  If returns "false", then a closure application returned
   // "false", and we return immediately.  If "consume" is true, entries are
   // set to NULL as they are processed, so they will not be processed again
   // later.
   static bool apply_closure_to_buffer(CardTableEntryClosure* cl,
                                       void** buf, size_t index, size_t sz,
                                       bool consume = true,
                                       int worker_i = 0);
   void **get_buf() { return _buf;}
   void set_buf(void **buf) {_buf = buf;}
   size_t get_index() { return _index;}
   void reinitialize() { _buf = 0; _sz = 0; _index = 0;}
 };
 class DirtyCardQueueSet: public PtrQueueSet {
   CardTableEntryClosure* _closure;
   DirtyCardQueue _shared_dirty_card_queue;
   // Override.
   bool mut_process_buffer(void** buf);
   // Protected by the _cbl_mon.
   FreeIdSet* _free_ids;
   // The number of completed buffers processed by mutator and rs thread,
   // respectively.
   jint _processed_buffers_mut;
   jint _processed_buffers_rs_thread;
 public:
   DirtyCardQueueSet();
   void initialize(Monitor* cbl_mon, Mutex* fl_lock,
                   int max_completed_queue = 0,
                   Mutex* lock = NULL, PtrQueueSet* fl_owner = NULL);
   // The number of parallel ids that can be claimed to allow collector or
   // mutator threads to do card-processing work.
   static size_t num_par_ids();
   static void handle_zero_index_for_thread(JavaThread* t);
   // Register "blk" as "the closure" for all queues.  Only one such closure
   // is allowed.  The "apply_closure_to_completed_buffer" method will apply
   // this closure to a completed buffer, and "iterate_closure_all_threads"
   // applies it to partially-filled buffers (the latter should only be done
   // with the world stopped).
   void set_closure(CardTableEntryClosure* closure);
   // If there is a registered closure for buffers, apply it to all entries
   // in all currently-active buffers.  This should only be applied at a
   // safepoint.  (Currently must not be called in parallel; this should
   // change in the future.)  If "consume" is true, processed entries are
   // discarded.
   void iterate_closure_all_threads(bool consume = true,
                                    size_t worker_i = 0);
   // If there exists some completed buffer, pop it, then apply the
   // registered closure to all its elements, nulling out those elements
   // processed.  If all elements are processed, returns "true".  If no
   // completed buffers exist, returns false.  If a completed buffer exists,
   // but is only partially completed before a "yield" happens, the
   // partially completed buffer (with its processed elements set to NULL)
   // is returned to the completed buffer set, and this call returns false.
   bool apply_closure_to_completed_buffer(int worker_i = 0,
                                          int stop_at = 0,
                                          bool with_CAS = false);
   bool apply_closure_to_completed_buffer_helper(int worker_i,
                                                 CompletedBufferNode* nd);
   CompletedBufferNode* get_completed_buffer_CAS();
   CompletedBufferNode* get_completed_buffer_lock(int stop_at);
   // Applies the current closure to all completed buffers,
   // non-consumptively.
   void apply_closure_to_all_completed_buffers();
   DirtyCardQueue* shared_dirty_card_queue() {
     return &_shared_dirty_card_queue;
   }
   // If a full collection is happening, reset partial logs, and ignore
   // completed ones: the full collection will make them all irrelevant.
   void abandon_logs();
   // If any threads have partial logs, add them to the global list of logs.
   void concatenate_logs();
   void clear_n_completed_buffers() { _n_completed_buffers = 0;}
   jint processed_buffers_mut() {
     return _processed_buffers_mut;
   }
   jint processed_buffers_rs_thread() {
     return _processed_buffers_rs_thread;
   }
 };

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src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp@4f360ec815ba (annotated)

src/share/vm/gc_implementation/g1/dirtyCardQueue.hpp