jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp@b0c374311c4e

8035400: Move G1ParScanThreadState into its own files
Summary: Extract the G1ParScanThreadState class from G1CollectedHeap.?pp into its own files.
Reviewed-by: brutisso, mgerdin

     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

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP

    28 #include "memory/genOopClosures.hpp"

    29 #include "memory/generation.hpp"

    30 #include "runtime/os.hpp"

    31 #include "utilities/taskqueue.hpp"

    33 // A BufferingOops closure tries to separate out the cost of finding roots

    34 // from the cost of applying closures to them.  It maintains an array of

    35 // ref-containing locations.  Until the array is full, applying the closure

    36 // to an oop* merely records that location in the array.  Since this

    37 // closure app cost is small, an elapsed timer can approximately attribute

    38 // all of this cost to the cost of finding the roots.  When the array fills

    39 // up, the wrapped closure is applied to all elements, keeping track of

    40 // this elapsed time of this process, and leaving the array empty.

    41 // The caller must be sure to call "done" to process any unprocessed

    42 // buffered entriess.

    44 class Generation;

    45 class HeapRegion;

    47 class BufferingOopClosure: public OopClosure {

    48 protected:

    49   enum PrivateConstants {

    50     BufferLength = 1024

    51   };

    53   StarTask  _buffer[BufferLength];

    54   StarTask* _buffer_top;

    55   StarTask* _buffer_curr;

    57   OopClosure* _oc;

    58   double      _closure_app_seconds;

    60   void process_buffer () {

    61     double start = os::elapsedTime();

    62     for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {

    63       if (curr->is_narrow()) {

    64         assert(UseCompressedOops, "Error");

    65         _oc->do_oop((narrowOop*)(*curr));

    66       } else {

    67         _oc->do_oop((oop*)(*curr));

    68       }

    69     }

    70     _buffer_curr = _buffer;

    71     _closure_app_seconds += (os::elapsedTime() - start);

    72   }

    74   template <class T> inline void do_oop_work(T* p) {

    75     if (_buffer_curr == _buffer_top) {

    76       process_buffer();

    77     }

    78     StarTask new_ref(p);

    79     *_buffer_curr = new_ref;

    80     ++_buffer_curr;

    81   }

    83 public:

    84   virtual void do_oop(narrowOop* p) { do_oop_work(p); }

    85   virtual void do_oop(oop* p)       { do_oop_work(p); }

    87   void done () {

    88     if (_buffer_curr > _buffer) {

    89       process_buffer();

    90     }

    91   }

    92   double closure_app_seconds () {

    93     return _closure_app_seconds;

    94   }

    95   BufferingOopClosure (OopClosure *oc) :

    96     _oc(oc),

    97     _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),

    98     _closure_app_seconds(0.0) { }

    99 };

   101 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP

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

src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp@b0c374311c4e

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