Subject: Backport of 8333088: ubsan: shenandoahAdaptiveHeuristics.cpp: runtime error: division by zero

---
 .../gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp b/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp
index 819f1e8d7..371e4c90c 100644
--- a/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp
+++ b/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp
@@ -243,7 +243,7 @@ bool ShenandoahAdaptiveHeuristics::should_start_gc() {
 
   double avg_cycle_time = _gc_time_history->davg() + (_margin_of_error_sd * _gc_time_history->dsd());
   double avg_alloc_rate = _allocation_rate.upper_bound(_margin_of_error_sd);
-  if (avg_cycle_time > allocation_headroom / avg_alloc_rate) {
+  if (avg_cycle_time * avg_alloc_rate > allocation_headroom) {
     log_info(gc)("Trigger: Average GC time (%.2f ms) is above the time for average allocation rate (%.0f %sB/s) to deplete free headroom (" SIZE_FORMAT "%s) (margin of error = %.2f)",
                  avg_cycle_time * 1000,
                  byte_size_in_proper_unit(avg_alloc_rate), proper_unit_for_byte_size(avg_alloc_rate),
-- 
2.33.0