src/share/vm/gc_implementation/shared/gcUtil.cpp

*** 29,41 ****
  
  float AdaptiveWeightedAverage::compute_adaptive_average(float new_sample,
                                                          float average) {
    // We smooth the samples by not using weight() directly until we've
    // had enough data to make it meaningful. We'd like the first weight
!   // used to be 1, the second to be 1/2, etc until we have 100/weight
!   // samples.
!   unsigned count_weight = 100/count();
    unsigned adaptive_weight = (MAX2(weight(), count_weight));
  
    float new_avg = exp_avg(average, new_sample, adaptive_weight);
  
    return new_avg;
--- 29,47 ----
  
  float AdaptiveWeightedAverage::compute_adaptive_average(float new_sample,
                                                          float average) {
    // We smooth the samples by not using weight() directly until we've
    // had enough data to make it meaningful. We'd like the first weight
!   // used to be 1, the second to be 1/2, etc until we have
!   // OLD_THRESHOLD/weight samples.
!   unsigned count_weight = 0;
! 
!   // Avoid division by zero if the counter wraps (7158457)
!   if (!is_old()) {
!     count_weight = OLD_THRESHOLD/count();
!   }
! 
    unsigned adaptive_weight = (MAX2(weight(), count_weight));
  
    float new_avg = exp_avg(average, new_sample, adaptive_weight);
  
    return new_avg;