8253232: G1Analytics::compute_pause_time_ratios() uses wrong pause times in calculation

Reviewed-by: tschatzl, kbarrett

Author: Ivan Walulya

src/hotspot/share/gc/g1/g1Analytics.cpp

@@ -151,7 +151,8 @@ void G1Analytics::report_alloc_rate_ms(double alloc_rate) {
 
 void G1Analytics::compute_pause_time_ratios(double end_time_sec, double pause_time_ms) {
   double long_interval_ms = (end_time_sec - oldest_known_gc_end_time_sec()) * 1000.0;
-  _long_term_pause_time_ratio = _recent_gc_times_ms->sum() / long_interval_ms;
+  double gc_pause_time_ms = _recent_gc_times_ms->sum() - _recent_gc_times_ms->oldest() + pause_time_ms;
+  _long_term_pause_time_ratio = gc_pause_time_ms / long_interval_ms;
   _long_term_pause_time_ratio = clamp(_long_term_pause_time_ratio, 0.0, 1.0);
 
   double short_interval_ms = (end_time_sec - most_recent_gc_end_time_sec()) * 1000.0;