jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/satbQueue.hpp@e2ed74d2e054 (annotated)

src/share/vm/gc_implementation/g1/satbQueue.hpp@e2ed74d2e054 (annotated)

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

Tue, 19 Aug 2014 02:05:49 -0700

author: poonam
date: Tue, 19 Aug 2014 02:05:49 -0700
changeset 7452: e2ed74d2e054
parent 7445: 42c091d63c72
child 7476: c2844108a708
permissions: -rw-r--r--

8044406: JVM crash with JDK8 (build 1.8.0-b132) with G1 GC
Summary: Fill the last card that has been allocated into with a dummy object
Reviewed-by: tschatzl, mgerdin

 /*
  * Copyright (c) 2001, 2014, 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.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
 #include "gc_implementation/g1/ptrQueue.hpp"
 class ObjectClosure;
 class JavaThread;
 class SATBMarkQueueSet;
 // A ptrQueue whose elements are "oops", pointers to object heads.
 class ObjPtrQueue: public PtrQueue {
   friend class SATBMarkQueueSet;
 private:
   // Filter out unwanted entries from the buffer.
   void filter();
   // Apply the closure to all elements.
   void apply_closure(ObjectClosure* cl);
   // Apply the closure to all elements and empty the buffer;
   void apply_closure_and_empty(ObjectClosure* cl);
   // Apply the closure to all elements of "buf", down to "index" (inclusive.)
   static void apply_closure_to_buffer(ObjectClosure* cl,
                                       void** buf, size_t index, size_t sz);
 public:
   ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
     // SATB queues are only active during marking cycles. We create
     // them with their active field set to false. If a thread is
     // created during a cycle and its SATB queue needs to be activated
     // before the thread starts running, we'll need to set its active
     // field to true. This is done in JavaThread::initialize_queues().
     PtrQueue(qset, perm, false /* active */) { }
   // Process queue entries and free resources.
   void flush();
   // Overrides PtrQueue::should_enqueue_buffer(). See the method's
   // definition for more information.
   virtual bool should_enqueue_buffer();
 #ifndef PRODUCT
   // Helpful for debugging
   void print(const char* name);
   static void print(const char* name, void** buf, size_t index, size_t sz);
 #endif // PRODUCT
   void verify_oops_in_buffer() NOT_DEBUG_RETURN;
 };
 class SATBMarkQueueSet: public PtrQueueSet {
   ObjectClosure* _closure;
   ObjectClosure** _par_closures;  // One per ParGCThread.
   ObjPtrQueue _shared_satb_queue;
   // Utility function to support sequential and parallel versions.  If
   // "par" is true, then "worker" is the par thread id; if "false", worker
   // is ignored.
   bool apply_closure_to_completed_buffer_work(bool par, uint worker);
 #ifdef ASSERT
   void dump_active_states(bool expected_active);
   void verify_active_states(bool expected_active);
 #endif // ASSERT
 public:
   SATBMarkQueueSet();
   void initialize(Monitor* cbl_mon, Mutex* fl_lock,
                   int process_completed_threshold,
                   Mutex* lock);
   static void handle_zero_index_for_thread(JavaThread* t);
   // Apply "set_active(active)" to all SATB queues in the set. It should be
   // called only with the world stopped. The method will assert that the
   // SATB queues of all threads it visits, as well as the SATB queue
   // set itself, has an active value same as expected_active.
   void set_active_all_threads(bool active, bool expected_active);
   // Filter all the currently-active SATB buffers.
   void filter_thread_buffers();
   // 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(ObjectClosure* closure);
   // Set the parallel closures: pointer is an array of pointers to
   // closures, one for each parallel GC thread.
   void set_par_closure(int i, ObjectClosure* closure);
   // Apply the registered closure to all entries on each
   // currently-active buffer and then empty the buffer. It should only
   // be called serially and at a safepoint.
   void iterate_closure_all_threads();
   // Parallel version of the above.
   void par_iterate_closure_all_threads(uint worker);
   // If there exists some completed buffer, pop it, then apply the
   // registered closure to all its elements, and return true.  If no
   // completed buffers exist, return false.
   bool apply_closure_to_completed_buffer() {
     return apply_closure_to_completed_buffer_work(false, 0);
   }
   // Parallel version of the above.
   bool par_apply_closure_to_completed_buffer(uint worker) {
     return apply_closure_to_completed_buffer_work(true, worker);
   }
   // Apply the given closure on enqueued and currently-active buffers
   // respectively. Both methods are read-only, i.e., they do not
   // modify any of the buffers.
   void iterate_completed_buffers_read_only(ObjectClosure* cl);
   void iterate_thread_buffers_read_only(ObjectClosure* cl);
 #ifndef PRODUCT
   // Helpful for debugging
   void print_all(const char* msg);
 #endif // PRODUCT
   ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
   // If a marking is being abandoned, reset any unprocessed log buffers.
   void abandon_partial_marking();
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/satbQueue.hpp@e2ed74d2e054 (annotated)

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