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

Reviewed-by: zgu Backport-of: e2d52ae2656deab98229a4701810334e9cc8519a
openjdk · Mar 2, 2021 · 39fb8e5 · 39fb8e5 · openjdk-notifier · Mar 2, 2021
1 parent b9582bf
commit 39fb8e5
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
@@ -35,6 +35,11 @@
 #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 (ShenandoahConcurrentRoots::can_do_concurrent_class_unloading()) {
     FLAG_SET_DEFAULT(ShenandoahSuspendibleWorkers, true);
     FLAG_SET_DEFAULT(VerifyBeforeExit, false);