src/hotspot/share/gc/z/zDirector.cpp

*** 64,74 ****
  
    // Perform GC if timer has expired.
    const double time_since_last_gc = ZStatCycle::time_since_last();
    const double time_until_gc = ZCollectionInterval - time_since_last_gc;
  
!   log_debug(gc, director)("Rule: Timer, Interval: %us, TimeUntilGC: %.3lfs",
                            ZCollectionInterval, time_until_gc);
  
    return time_until_gc <= 0;
  }
  
--- 64,74 ----
  
    // Perform GC if timer has expired.
    const double time_since_last_gc = ZStatCycle::time_since_last();
    const double time_until_gc = ZCollectionInterval - time_since_last_gc;
  
!   log_debug(gc, director)("Rule: Timer, Interval: %us, TimeUntilGC: %.3fs",
                            ZCollectionInterval, time_until_gc);
  
    return time_until_gc <= 0;
  }
  
*** 131,141 ****
    // We also deduct the sample interval, so that we don't overshoot the target
    // time and end up starting the GC too late in the next interval.
    const double sample_interval = 1.0 / ZStatAllocRate::sample_hz;
    const double time_until_gc = time_until_oom - max_duration_of_gc - sample_interval;
  
!   log_debug(gc, director)("Rule: Allocation Rate, MaxAllocRate: %.3lfMB/s, Free: " SIZE_FORMAT "MB, MaxDurationOfGC: %.3lfs, TimeUntilGC: %.3lfs",
                            max_alloc_rate / M, free / M, max_duration_of_gc, time_until_gc);
  
    return time_until_gc <= 0;
  }
  
--- 131,141 ----
    // We also deduct the sample interval, so that we don't overshoot the target
    // time and end up starting the GC too late in the next interval.
    const double sample_interval = 1.0 / ZStatAllocRate::sample_hz;
    const double time_until_gc = time_until_oom - max_duration_of_gc - sample_interval;
  
!   log_debug(gc, director)("Rule: Allocation Rate, MaxAllocRate: %.3fMB/s, Free: " SIZE_FORMAT "MB, MaxDurationOfGC: %.3fs, TimeUntilGC: %.3fs",
                            max_alloc_rate / M, free / M, max_duration_of_gc, time_until_gc);
  
    return time_until_gc <= 0;
  }
  
*** 160,170 ****
    const size_t used = ZHeap::heap()->used();
    const double time_since_last_gc = ZStatCycle::time_since_last();
    const double time_since_last_gc_threshold = 5 * 60; // 5 minutes
    if (used < used_threshold && time_since_last_gc < time_since_last_gc_threshold) {
      // Don't even consider doing a proactive GC
!     log_debug(gc, director)("Rule: Proactive, UsedUntilEnabled: " SIZE_FORMAT "MB, TimeUntilEnabled: %.3lfs",
                              (used_threshold - used) / M,
                              time_since_last_gc_threshold - time_since_last_gc);
      return false;
    }
  
--- 160,170 ----
    const size_t used = ZHeap::heap()->used();
    const double time_since_last_gc = ZStatCycle::time_since_last();
    const double time_since_last_gc_threshold = 5 * 60; // 5 minutes
    if (used < used_threshold && time_since_last_gc < time_since_last_gc_threshold) {
      // Don't even consider doing a proactive GC
!     log_debug(gc, director)("Rule: Proactive, UsedUntilEnabled: " SIZE_FORMAT "MB, TimeUntilEnabled: %.3fs",
                              (used_threshold - used) / M,
                              time_since_last_gc_threshold - time_since_last_gc);
      return false;
    }
  
*** 173,183 ****
    const AbsSeq& duration_of_gc = ZStatCycle::normalized_duration();
    const double max_duration_of_gc = duration_of_gc.davg() + (duration_of_gc.dsd() * one_in_1000);
    const double acceptable_gc_interval = max_duration_of_gc * ((assumed_throughput_drop_during_gc / acceptable_throughput_drop) - 1.0);
    const double time_until_gc = acceptable_gc_interval - time_since_last_gc;
  
!   log_debug(gc, director)("Rule: Proactive, AcceptableGCInterval: %.3lfs, TimeSinceLastGC: %.3lfs, TimeUntilGC: %.3lfs",
                            acceptable_gc_interval, time_since_last_gc, time_until_gc);
  
    return time_until_gc <= 0;
  }
  
--- 173,183 ----
    const AbsSeq& duration_of_gc = ZStatCycle::normalized_duration();
    const double max_duration_of_gc = duration_of_gc.davg() + (duration_of_gc.dsd() * one_in_1000);
    const double acceptable_gc_interval = max_duration_of_gc * ((assumed_throughput_drop_during_gc / acceptable_throughput_drop) - 1.0);
    const double time_until_gc = acceptable_gc_interval - time_since_last_gc;
  
!   log_debug(gc, director)("Rule: Proactive, AcceptableGCInterval: %.3fs, TimeSinceLastGC: %.3fs, TimeUntilGC: %.3fs",
                            acceptable_gc_interval, time_since_last_gc, time_until_gc);
  
    return time_until_gc <= 0;
  }
  
*** 196,206 ****
    const size_t used = ZHeap::heap()->used();
    const size_t free_with_reserve = max_capacity - used;
    const size_t free = free_with_reserve - MIN2(free_with_reserve, max_reserve);
    const double free_percent = percent_of(free, max_capacity);
  
!   log_debug(gc, director)("Rule: High Usage, Free: " SIZE_FORMAT "MB(%.1lf%%)",
                            free / M, free_percent);
  
    return free_percent <= 5.0;
  }
  
--- 196,206 ----
    const size_t used = ZHeap::heap()->used();
    const size_t free_with_reserve = max_capacity - used;
    const size_t free = free_with_reserve - MIN2(free_with_reserve, max_reserve);
    const double free_percent = percent_of(free, max_capacity);
  
!   log_debug(gc, director)("Rule: High Usage, Free: " SIZE_FORMAT "MB(%.1f%%)",
                            free / M, free_percent);
  
    return free_percent <= 5.0;
  }