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src/hotspot/share/gc/g1/g1ServiceThread.hpp

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rev 60637 : 8252141: Rename G1YoungRemSetSamplingThread to better reflect its purpose
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rev 60638 : [mq]: 8252141-kb-rev1


  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_G1_G1SERVICETHREAD_HPP
  26 #define SHARE_GC_G1_G1SERVICETHREAD_HPP
  27 
  28 #include "gc/shared/concurrentGCThread.hpp"
  29 
  30 // The G1ServiceThread is used to do a number of different task:
  31 //   - re-assess the validity of the prediction for the
  32 //     remembered set lengths of the young generation.
  33 //   - check if a periodic GC should be scheduled.
  34 class G1ServiceThread: public ConcurrentGCThread {
  35 private:
  36   Monitor _monitor;
  37 
  38   double _last_periodic_gc_attempt_s;
  39 
  40   double _vtime_accum;  // Accumulated virtual time.
  41 
  42   // Sample the current length of remembered sets for young.
  43   //
  44   // At the end of the GC G1 determines the length of the young gen based on
  45   // how much time the next GC can take, and when the next GC may occur
  46   // according to the MMU.
  47   //
  48   // The assumption is that a significant part of the GC is spent on scanning
  49   // the remembered sets (and many other components), so this thread constantly
  50   // reevaluates the prediction for the remembered set scanning costs, and potentially


  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_G1_G1SERVICETHREAD_HPP
  26 #define SHARE_GC_G1_G1SERVICETHREAD_HPP
  27 
  28 #include "gc/shared/concurrentGCThread.hpp"
  29 
  30 // The G1ServiceThread is used to periodically do a number of different tasks:
  31 //   - re-assess the validity of the prediction for the
  32 //     remembered set lengths of the young generation.
  33 //   - check if a periodic GC should be scheduled.
  34 class G1ServiceThread: public ConcurrentGCThread {
  35 private:
  36   Monitor _monitor;
  37 
  38   double _last_periodic_gc_attempt_s;
  39 
  40   double _vtime_accum;  // Accumulated virtual time.
  41 
  42   // Sample the current length of remembered sets for young.
  43   //
  44   // At the end of the GC G1 determines the length of the young gen based on
  45   // how much time the next GC can take, and when the next GC may occur
  46   // according to the MMU.
  47   //
  48   // The assumption is that a significant part of the GC is spent on scanning
  49   // the remembered sets (and many other components), so this thread constantly
  50   // reevaluates the prediction for the remembered set scanning costs, and potentially
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