jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/asPSOldGen.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) 2003, 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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    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ASPSOLDGEN_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ASPSOLDGEN_HPP

    28 #include "gc_implementation/parallelScavenge/objectStartArray.hpp"

    29 #include "gc_implementation/parallelScavenge/psOldGen.hpp"

    30 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp"

    31 #include "gc_implementation/shared/generationCounters.hpp"

    32 #include "gc_implementation/shared/mutableSpace.hpp"

    33 #include "gc_implementation/shared/spaceCounters.hpp"

    35 class ASPSOldGen : public PSOldGen {

    36   friend class VMStructs;

    37   size_t _gen_size_limit;  // Largest size the generation's reserved size

    38                            // can grow.

    39  public:

    40   ASPSOldGen(size_t initial_byte_size,

    41              size_t minimum_byte_size,

    42              size_t byte_size_limit,

    43              const char* gen_name, int level);

    44   ASPSOldGen(PSVirtualSpace* vs,

    45              size_t initial_byte_size,

    46              size_t minimum_byte_size,

    47              size_t byte_size_limit,

    48              const char* gen_name, int level);

    49   size_t gen_size_limit()               { return _gen_size_limit; }

    50   size_t max_gen_size()                 { return _reserved.byte_size(); }

    51   void set_gen_size_limit(size_t v)     { _gen_size_limit = v; }

    53   // After a shrink or expand reset the generation

    54   void reset_after_change();

    56   // Return number of bytes that the virtual space in the generation is willing

    57   // to expand or contract.  The results from these methods should feed into the

    58   // decisions about adjusting the virtual space.

    59   size_t available_for_expansion();

    60   size_t available_for_contraction();

    62   // Accessors

    63   void set_reserved(MemRegion v) { _reserved = v; }

    65   // Debugging support

    66   virtual const char* short_name() const { return "ASPSOldGen"; }

    67 };

    69 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_ASPSOLDGEN_HPP

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

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

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