8332717: ZGC: Division by zero in heuristics

Reviewed-by: aboldtch, shade
2024-06-20 05:23:08 +00:00 · 2024-06-20 05:23:08 +00:00 · 2d4185f4f1
commit 2d4185f4f1
parent fad6644eab
1 changed files with 4 additions and 0 deletions
--- a/src/hotspot/share/gc/z/zDirector.cpp
+++ b/src/hotspot/share/gc/z/zDirector.cpp
@ -524,6 +524,10 @@ static bool rule_major_allocation_rate(const ZDirectorStats& stats) {
 }

 static double calculate_young_to_old_worker_ratio(const ZDirectorStats& stats) {
+  if (!stats._old_stats._cycle._is_time_trustable) {
+    return 1.0;
+  }
+
  const double young_gc_time = gc_time(stats._young_stats);
  const double old_gc_time = gc_time(stats._old_stats);
  const size_t reclaimed_per_young_gc = stats._young_stats._stat_heap._reclaimed_avg;