jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp@e72f7eecc96d

8013895: G1: G1SummarizeRSetStats output on Linux needs improvemen
Summary: Fixed the output of G1SummarizeRSetStats: too small datatype for the number of concurrently processed cards, added concurrent remembered set thread time retrieval for Linux and Windows (BSD uses os::elapsedTime() now), and other cleanup. The information presented during VM operation is now relative to the previous output, not always cumulative if G1SummarizeRSetStatsPeriod > 0. At VM exit, the code prints a cumulative summary.
Reviewed-by: johnc, jwilhelm

     1 /*

     2  * Copyright (c) 2001, 2013, 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_CONCURRENTG1REFINE_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP

    28 #include "gc_implementation/g1/g1HotCardCache.hpp"

    29 #include "memory/allocation.hpp"

    30 #include "runtime/thread.hpp"

    31 #include "utilities/globalDefinitions.hpp"

    33 // Forward decl

    34 class ConcurrentG1RefineThread;

    35 class G1CollectedHeap;

    36 class G1HotCardCache;

    37 class G1RemSet;

    38 class DirtyCardQueue;

    40 class ConcurrentG1Refine: public CHeapObj<mtGC> {

    41   ConcurrentG1RefineThread** _threads;

    42   int _n_threads;

    43   int _n_worker_threads;

    44  /*

    45   * The value of the update buffer queue length falls into one of 3 zones:

    46   * green, yellow, red. If the value is in [0, green) nothing is

    47   * done, the buffers are left unprocessed to enable the caching effect of the

    48   * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement

    49   * threads are gradually activated. In [yellow, red) all threads are

    50   * running. If the length becomes red (max queue length) the mutators start

    51   * processing the buffers.

    52   *

    53   * There are some interesting cases (when G1UseAdaptiveConcRefinement

    54   * is turned off):

    55   * 1) green = yellow = red = 0. In this case the mutator will process all

    56   *    buffers. Except for those that are created by the deferred updates

    57   *    machinery during a collection.

    58   * 2) green = 0. Means no caching. Can be a good way to minimize the

    59   *    amount of time spent updating rsets during a collection.

    60   */

    61   int _green_zone;

    62   int _yellow_zone;

    63   int _red_zone;

    65   int _thread_threshold_step;

    67   // We delay the refinement of 'hot' cards using the hot card cache.

    68   G1HotCardCache _hot_card_cache;

    70   // Reset the threshold step value based of the current zone boundaries.

    71   void reset_threshold_step();

    73  public:

    74   ConcurrentG1Refine(G1CollectedHeap* g1h);

    75   ~ConcurrentG1Refine();

    77   void init(); // Accomplish some initialization that has to wait.

    78   void stop();

    80   void reinitialize_threads();

    82   // Iterate over all concurrent refinement threads

    83   void threads_do(ThreadClosure *tc);

    85   // Iterate over all worker refinement threads

    86   void worker_threads_do(ThreadClosure * tc);

    88   // The RS sampling thread

    89   ConcurrentG1RefineThread * sampling_thread() const;

    91   static int thread_num();

    93   void print_worker_threads_on(outputStream* st) const;

    95   void set_green_zone(int x)  { _green_zone = x;  }

    96   void set_yellow_zone(int x) { _yellow_zone = x; }

    97   void set_red_zone(int x)    { _red_zone = x;    }

    99   int green_zone() const      { return _green_zone;  }

   100   int yellow_zone() const     { return _yellow_zone; }

   101   int red_zone() const        { return _red_zone;    }

   103   int total_thread_num() const  { return _n_threads;        }

   104   int worker_thread_num() const { return _n_worker_threads; }

   106   int thread_threshold_step() const { return _thread_threshold_step; }

   108   G1HotCardCache* hot_card_cache() { return &_hot_card_cache; }

   109 };

   111 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP

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

src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp@e72f7eecc96d

src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp