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src/share/vm/gc/g1/g1YoungRemSetSamplingThread.cpp

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rev 10389 : imported patch webrev.01
rev 10391 : [mq]: webrev.03


  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 #include "precompiled.hpp"
  26 #include "gc/g1/g1CollectedHeap.inline.hpp"
  27 #include "gc/g1/g1CollectorPolicy.hpp"
  28 #include "gc/g1/g1CollectionSet.hpp"
  29 #include "gc/g1/g1YoungRemSetSamplingThread.hpp"
  30 #include "gc/g1/heapRegion.inline.hpp"
  31 #include "gc/g1/heapRegionRemSet.hpp"
  32 #include "gc/g1/suspendibleThreadSet.hpp"
  33 #include "runtime/mutexLocker.hpp"
  34 
  35 void G1YoungRemSetSamplingThread::run() {
  36   initialize_in_thread();
  37   wait_for_universe_init();
  38 
  39   run_service();
  40 
  41   terminate();
  42 }
  43 
  44 void G1YoungRemSetSamplingThread::stop() {
  45   // it is ok to take late safepoints here, if needed
  46   {
  47     MutexLockerEx mu(Terminator_lock);
  48     _should_terminate = true;
  49   }
  50 
  51   stop_service();
  52 
  53   {
  54     MutexLockerEx mu(Terminator_lock);
  55     while (!_has_terminated) {
  56       Terminator_lock->wait();
  57     }
  58   }
  59 }
  60 
  61 G1YoungRemSetSamplingThread::G1YoungRemSetSamplingThread() :
  62     ConcurrentGCThread(),
  63     _monitor(Mutex::nonleaf,
  64              "G1YoungRemSetSamplingThread monitor",
  65              true,
  66              Monitor::_safepoint_check_never) {
  67   set_name("G1 Young RemSet Sampling");
  68   create_and_start();
  69 }
  70 
  71 void G1YoungRemSetSamplingThread::sleep_before_next_cycle() {
  72   MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag);
  73   if (!_should_terminate) {
  74     uintx waitms = G1ConcRefinementServiceIntervalMillis; // 300, really should be?
  75     _monitor.wait(Mutex::_no_safepoint_check_flag, waitms);
  76   }
  77 }
  78 
  79 void G1YoungRemSetSamplingThread::run_service() {
  80   double vtime_start = os::elapsedVTime();
  81 
  82   while (!_should_terminate) {
  83     sample_young_list_rs_lengths();
  84 
  85     if (os::supports_vtime()) {
  86       _vtime_accum = (os::elapsedVTime() - vtime_start);
  87     } else {
  88       _vtime_accum = 0.0;
  89     }
  90 
  91     sleep_before_next_cycle();
  92   }
  93 }
  94 
  95 void G1YoungRemSetSamplingThread::stop_service() {
  96   MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag);
  97   _monitor.notify();
  98 }
  99 
 100 void G1YoungRemSetSamplingThread::sample_young_list_rs_lengths() {
 101   SuspendibleThreadSetJoiner sts;
 102   G1CollectedHeap* g1h = G1CollectedHeap::heap();




  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 #include "precompiled.hpp"
  26 #include "gc/g1/g1CollectedHeap.inline.hpp"
  27 #include "gc/g1/g1CollectorPolicy.hpp"
  28 #include "gc/g1/g1CollectionSet.hpp"
  29 #include "gc/g1/g1YoungRemSetSamplingThread.hpp"
  30 #include "gc/g1/heapRegion.inline.hpp"
  31 #include "gc/g1/heapRegionRemSet.hpp"
  32 #include "gc/g1/suspendibleThreadSet.hpp"
  33 #include "runtime/mutexLocker.hpp"
  34 


























  35 G1YoungRemSetSamplingThread::G1YoungRemSetSamplingThread() :
  36     ConcurrentGCThread(),
  37     _monitor(Mutex::nonleaf,
  38              "G1YoungRemSetSamplingThread monitor",
  39              true,
  40              Monitor::_safepoint_check_never) {
  41   set_name("G1 Young RemSet Sampling");
  42   create_and_start();
  43 }
  44 
  45 void G1YoungRemSetSamplingThread::sleep_before_next_cycle() {
  46   MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag);
  47   if (!should_terminate()) {
  48     uintx waitms = G1ConcRefinementServiceIntervalMillis; // 300, really should be?
  49     _monitor.wait(Mutex::_no_safepoint_check_flag, waitms);
  50   }
  51 }
  52 
  53 void G1YoungRemSetSamplingThread::run_service() {
  54   double vtime_start = os::elapsedVTime();
  55 
  56   while (!should_terminate()) {
  57     sample_young_list_rs_lengths();
  58 
  59     if (os::supports_vtime()) {
  60       _vtime_accum = (os::elapsedVTime() - vtime_start);
  61     } else {
  62       _vtime_accum = 0.0;
  63     }
  64 
  65     sleep_before_next_cycle();
  66   }
  67 }
  68 
  69 void G1YoungRemSetSamplingThread::stop_service() {
  70   MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag);
  71   _monitor.notify();
  72 }
  73 
  74 void G1YoungRemSetSamplingThread::sample_young_list_rs_lengths() {
  75   SuspendibleThreadSetJoiner sts;
  76   G1CollectedHeap* g1h = G1CollectedHeap::heap();


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