1 /*

     2  * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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

    20  * questions.

    21  *

    22  */

    23 

    24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP

    25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP

    26 

    27 #include "memory/allocation.hpp"

    28 

    29 /**

    30  * This provides the following in JVMStat:

    31  *

    32  * constants:

    33  * - sun.gc.shenandoah.regions.timestamp    the timestamp for this sample

    34  * - sun.gc.shenandoah.regions.max_regions  maximum number of regions

    35  * - sun.gc.shenandoah.regions.region_size  size per region, in kilobytes

    36  *

    37  * variables:

    38  * - sun.gc.shenandoah.regions.status       current GC status:

    39  *     - bit 0 set when marking in progress

    40  *     - bit 1 set when evacuation in progress

    41  *     - bit 2 set when update refs in progress

    42  *     - bit 3 set when traversal in progress

    43  *

    44  * two variable counters per region, with $max_regions (see above) counters:

    45  * - sun.gc.shenandoah.regions.region.$i.data

    46  * where $ is the region number from 0 <= i < $max_regions

    47  *

    48  * .data is in the following format:

    49  * - bits 0-6    used memory in percent

    50  * - bits 7-13   live memory in percent

    51  * - bits 14-20  tlab allocated memory in percent

    52  * - bits 21-27  gclab allocated memory in percent

    53  * - bits 28-34  shared allocated memory in percent

    54  * - bits 35-41  <reserved>

    55  * - bits 42-50  <reserved>

    56  * - bits 51-57  <reserved>

    57  * - bits 58-63  status

    58  *      - bits describe the state as recorded in ShenandoahHeapRegion

    59  */

    60 class ShenandoahHeapRegionCounters : public CHeapObj<mtGC>  {

    61 private:

    62   static const jlong PERCENT_MASK = 0x7f;

    63   static const jlong STATUS_MASK  = 0x3f;

    64 

    65   static const jlong USED_SHIFT   = 0;

    66   static const jlong LIVE_SHIFT   = 7;

    67   static const jlong TLAB_SHIFT   = 14;

    68   static const jlong GCLAB_SHIFT  = 21;

    69   static const jlong SHARED_SHIFT = 28;

    70 

    71   static const jlong STATUS_SHIFT = 58;

    72 

    73   char* _name_space;

    74   PerfLongVariable** _regions_data;

    75   PerfLongVariable* _timestamp;

    76   PerfLongVariable* _status;

    77   volatile jlong _last_sample_millis;

    78 

    79 public:

    80   ShenandoahHeapRegionCounters();

    81   ~ShenandoahHeapRegionCounters();

    82   void update();

    83 };

    84 

    85 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP