jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.hpp@4dfb2df418f2

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

     1 /*

     2  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEP_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEP_HPP

    28 #include "gc_implementation/shared/collectorCounters.hpp"

    29 #include "gc_implementation/shared/markSweep.inline.hpp"

    30 #include "utilities/stack.hpp"

    32 class PSAdaptiveSizePolicy;

    33 class PSYoungGen;

    34 class PSOldGen;

    36 class PSMarkSweep : public MarkSweep {

    37  private:

    38   static elapsedTimer        _accumulated_time;

    39   static unsigned int        _total_invocations;

    40   static jlong               _time_of_last_gc;   // ms

    41   static CollectorCounters*  _counters;

    43   // Closure accessors

    44   static OopClosure* mark_and_push_closure() { return &MarkSweep::mark_and_push_closure; }

    45   static VoidClosure* follow_stack_closure() { return (VoidClosure*)&MarkSweep::follow_stack_closure; }

    46   static OopClosure* adjust_pointer_closure() { return (OopClosure*)&MarkSweep::adjust_pointer_closure; }

    47   static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&MarkSweep::adjust_root_pointer_closure; }

    48   static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&MarkSweep::is_alive; }

    50  debug_only(public:)  // Used for PSParallelCompact debugging

    51   // Mark live objects

    52   static void mark_sweep_phase1(bool clear_all_softrefs);

    53   // Calculate new addresses

    54   static void mark_sweep_phase2();

    55  debug_only(private:) // End used for PSParallelCompact debugging

    56   // Update pointers

    57   static void mark_sweep_phase3();

    58   // Move objects to new positions

    59   static void mark_sweep_phase4();

    61  debug_only(public:)  // Used for PSParallelCompact debugging

    62   // Temporary data structures for traversal and storing/restoring marks

    63   static void allocate_stacks();

    64   static void deallocate_stacks();

    65   static void set_ref_processor(ReferenceProcessor* rp) {  // delete this method

    66     _ref_processor = rp;

    67   }

    68  debug_only(private:) // End used for PSParallelCompact debugging

    70   // If objects are left in eden after a collection, try to move the boundary

    71   // and absorb them into the old gen.  Returns true if eden was emptied.

    72   static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy,

    73                                          PSYoungGen* young_gen,

    74                                          PSOldGen* old_gen);

    76   // Reset time since last full gc

    77   static void reset_millis_since_last_gc();

    79  public:

    80   static void invoke(bool clear_all_softrefs);

    81   static void invoke_no_policy(bool clear_all_softrefs);

    83   static void initialize();

    85   // Public accessors

    86   static elapsedTimer* accumulated_time() { return &_accumulated_time; }

    87   static unsigned int total_invocations() { return _total_invocations; }

    88   static CollectorCounters* counters()    { return _counters; }

    90   // Time since last full gc (in milliseconds)

    91   static jlong millis_since_last_gc();

    92 };

    94 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSMARKSWEEP_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.hpp@4dfb2df418f2

src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.hpp