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src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.hpp

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  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  */
 24 
 25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
 26 #define SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
 27 
 28 #include "memory/allocation.hpp"


 29 
 30 /**
 31  * This provides the following in JVMStat:
 32  *
 33  * constants:
 34  * - sun.gc.shenandoah.regions.timestamp    the timestamp for this sample
 35  * - sun.gc.shenandoah.regions.max_regions  maximum number of regions
 36  * - sun.gc.shenandoah.regions.region_size  size per region, in kilobytes
 37  *
 38  * variables:
 39  * - sun.gc.shenandoah.regions.status       current GC status:
 40  *     - bit 0 set when marking in progress
 41  *     - bit 1 set when evacuation in progress
 42  *     - bit 2 set when update refs 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_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP

  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  */
 24 
 25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
 26 #define SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
 27 
 28 #include "memory/allocation.hpp"
 29 #include "logging/logFileStreamOutput.hpp"
 30 #include "gc/shenandoah/shenandoahLogFileOutput.hpp"
 31 
 32 /**
 33  * This provides the following in JVMStat:
 34  *
 35  * constants:
 36  * - sun.gc.shenandoah.regions.timestamp    the timestamp for this sample
 37  * - sun.gc.shenandoah.regions.max_regions  maximum number of regions
 38  * - sun.gc.shenandoah.regions.region_size  size per region, in kilobytes
 39  *
 40  * variables:
 41  * - sun.gc.shenandoah.regions.status       current GC status:
 42  *   | global | old   | young | mode |
 43  *   |  0..1  | 2..3  | 4..5  | 6..7 |
 44  *
 45  *   For each generation:
 46  *   0 = idle, 1 = marking, 2 = evacuating, 3 = updating refs
 47  *
 48  *   For mode:
 49  *   0 = concurrent, 1 = degenerated, 2 = full
 50  *
 51  * two variable counters per region, with $max_regions (see above) counters:
 52  * - sun.gc.shenandoah.regions.region.$i.data
 53  * where $ is the region number from 0 <= i < $max_regions
 54  *
 55  * .data is in the following format:
 56  * - bits 0-6    used memory in percent
 57  * - bits 7-13   live memory in percent
 58  * - bits 14-20  tlab allocated memory in percent
 59  * - bits 21-27  gclab allocated memory in percent
 60  * - bits 28-34  shared allocated memory in percent
 61  * - bits 35-41  plab allocated memory in percent
 62  * - bits 42-50  <reserved>
 63  * - bits 51-55  age
 64  * - bits 56-57  affiliation: 0 = free, young = 1, old = 2
 65  * - bits 58-63  status
 66  *      - bits describe the state as recorded in ShenandoahHeapRegion
 67  */
 68 class ShenandoahHeapRegionCounters : public CHeapObj<mtGC>  {
 69 private:
 70   static const jlong PERCENT_MASK      = 0x7f;
 71   static const jlong AGE_MASK          = 0x1f;
 72   static const jlong AFFILIATION_MASK  = 0x03;
 73   static const jlong STATUS_MASK       = 0x3f;




 74 
 75   static const jlong USED_SHIFT        = 0;
 76   static const jlong LIVE_SHIFT        = 7;
 77   static const jlong TLAB_SHIFT        = 14;
 78   static const jlong GCLAB_SHIFT       = 21;
 79   static const jlong SHARED_SHIFT      = 28;
 80   static const jlong PLAB_SHIFT        = 35;
 81   static const jlong AGE_SHIFT         = 51;
 82   static const jlong AFFILIATION_SHIFT = 56;
 83   static const jlong STATUS_SHIFT      = 58;
 84 
 85   char* _name_space;
 86   PerfLongVariable** _regions_data;
 87   PerfLongVariable* _timestamp;
 88   PerfLongVariable* _status;
 89   volatile jlong _last_sample_millis;
 90 
 91   uint _count = 0;
 92   ShenandoahLogFileOutput* _log_file;
 93 public:
 94   ShenandoahHeapRegionCounters();
 95   ~ShenandoahHeapRegionCounters();
 96   void update();
 97 
 98 private:
 99   static jlong encode_heap_status(ShenandoahHeap* heap) ;
100 };
101 
102 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
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