8261413: Shenandoah: Disable class-unloading in I-U mode

Reviewed-by: shade, zgu
openjdk · Feb 16, 2021 · e2d52ae · e2d52ae · openjdk-notifier · Feb 16, 2021
1 parent 34ae7ae
commit e2d52ae
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/hotspot/share/gc/shenandoah/mode/shenandoahIUMode.cpp b/src/hotspot/share/gc/shenandoah/mode/shenandoahIUMode.cpp
@@ -34,6 +34,11 @@
 #include "runtime/java.hpp"
 
 void ShenandoahIUMode::initialize_flags() const {
+  if (FLAG_IS_CMDLINE(ClassUnloadingWithConcurrentMark) && ClassUnloading) {
+    log_warning(gc)("Shenandoah I-U mode sets -XX:-ClassUnloadingWithConcurrentMark; see JDK-8261341 for details");
+  }
+  FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
+
   if (ClassUnloading) {
     FLAG_SET_DEFAULT(ShenandoahSuspendibleWorkers, true);
     FLAG_SET_DEFAULT(VerifyBeforeExit, false);