8342786: Shenandoah: Emit AllocationRequiringGC jfr events

Reviewed-by: kdnilsen, serb, wkemper

Author: Rui Li

src/hotspot/share/gc/shenandoah/shenandoahController.cpp

@@ -23,13 +23,13 @@
  *
  */
 
+#include "gc/shared/allocTracer.hpp"
 #include "gc/shared/gc_globals.hpp"
 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
 #include "gc/shenandoah/shenandoahController.hpp"
 #include "gc/shenandoah/shenandoahHeap.hpp"
 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
 
-
 void ShenandoahController::update_gc_id() {
   _gc_id.add_then_fetch((size_t)1);
 }
@@ -45,10 +45,12 @@ void ShenandoahController::handle_alloc_failure(const ShenandoahAllocRequest& re
   const GCCause::Cause cause = is_humongous ? GCCause::_shenandoah_humongous_allocation_failure : GCCause::_allocation_failure;
 
   ShenandoahHeap* const heap = ShenandoahHeap::heap();
+  size_t req_byte = req.size() * HeapWordSize;
   if (heap->cancel_gc(cause)) {
-    log_info(gc)("Failed to allocate %s, " PROPERFMT, req.type_string(), PROPERFMTARGS(req.size() * HeapWordSize));
+    log_info(gc)("Failed to allocate %s, " PROPERFMT, req.type_string(), PROPERFMTARGS(req_byte));
     request_gc(cause);
   }
+  AllocTracer::send_allocation_requiring_gc_event(req_byte, checked_cast<uint>(get_gc_id()));
 
   if (block) {
     MonitorLocker ml(&_alloc_failure_waiters_lock);

test/hotspot/jtreg/gc/stress/jfr/TestStressAllocationGCEventsWithShenandoah.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+ * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+package jdk.jfr.event.gc.detailed;
+
+/**
+ * @test id=default
+ * @key randomness
+ * @requires vm.hasJFR
+ * @requires vm.gc.Shenandoah
+ * @library /test/lib /test/jdk
+ * @run main/othervm -XX:+UseShenandoahGC -Xmx64m -XX:ActiveProcessorCount=1 jdk.jfr.event.gc.detailed.TestStressAllocationGCEventsWithShenandoah
+ */
+
+ /**
+  * @test id=generational
+  * @key randomness
+  * @requires vm.hasJFR
+  * @requires vm.gc.Shenandoah
+  * @library /test/lib /test/jdk
+  * @run main/othervm -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xmx64m -XX:ActiveProcessorCount=1 jdk.jfr.event.gc.detailed.TestStressAllocationGCEventsWithShenandoah
+  */
+public class TestStressAllocationGCEventsWithShenandoah {
+
+    public static void main(String[] args) throws Exception {
+        new StressAllocationGCEvents().run(args);
+    }
+}

test/hotspot/jtreg/gc/stress/jfr/TestStressBigAllocationGCEventsWithShenandoah.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+ * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+package jdk.jfr.event.gc.detailed;
+
+/**
+ * @test id=default
+ * @key randomness
+ * @requires vm.hasJFR
+ * @requires vm.gc.Shenandoah
+ * @library /test/lib /test/jdk
+ * @run main/othervm -XX:+UseShenandoahGC -Xmx256m -XX:ActiveProcessorCount=1 jdk.jfr.event.gc.detailed.TestStressBigAllocationGCEventsWithShenandoah 1048576
+ */
+
+ /**
+  * @test id=generational
+  * @key randomness
+  * @requires vm.hasJFR
+  * @requires vm.gc.Shenandoah
+  * @library /test/lib /test/jdk
+  * @run main/othervm -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -Xmx256m -XX:ActiveProcessorCount=1 jdk.jfr.event.gc.detailed.TestStressBigAllocationGCEventsWithShenandoah 1048576
+  */
+public class TestStressBigAllocationGCEventsWithShenandoah {
+
+    public static void main(String[] args) throws Exception {
+        new StressAllocationGCEvents().run(args);
+    }
+}