[Misc] Print the young generation histogram once after parnew gc

Summary:
- Port D65580 to dragonwell
- Print the young generation histogram once after parnew gc with the manageable flag: PrintYoungGenHistoAfterParNewGC

Test Plan: hotspot/test/gc/parNew/testPrintYoungGenHisto.sh

Reviewers: 传胜

Differential Revision: https://aone.alibaba-inc.com/code/D849729

src/share/vm/gc_implementation/parNew/parNewGeneration.cpp

 /*
- * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2019, 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
@@ -40,6 +40,7 @@
 #include "memory/genOopClosures.inline.hpp"
 #include "memory/generation.hpp"
 #include "memory/generation.inline.hpp"
+#include "memory/heapInspection.hpp"
 #include "memory/referencePolicy.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/sharedHeap.hpp"
@@ -1096,6 +1097,13 @@ void ParNewGeneration::collect(bool   full,
 
   _gc_timer->register_gc_end();
 
+  // print the young generation histo once after parnew gc then reset the PrintYoungGenHistoAfterParNewGC
+  if (PrintYoungGenHistoAfterParNewGC) {
+    HeapInspection inspect(false, false, false, NULL);
+    inspect.heap_inspection(tty);
+    PrintYoungGenHistoAfterParNewGC = false;
+  }
+
   gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions());
 }
 

src/share/vm/memory/heapInspection.cpp

 /*
- * Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2019, 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
@@ -26,6 +26,7 @@
 #include "classfile/classLoaderData.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "memory/genCollectedHeap.hpp"
+#include "memory/generation.hpp"
 #include "memory/heapInspection.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/os.hpp"
@@ -487,8 +488,14 @@ size_t HeapInspection::populate_table(KlassInfoTable* cit, BoolObjectClosure *fi
   ResourceMark rm;
 
   RecordInstanceClosure ric(cit, filter);
-  Universe::heap()->object_iterate(&ric);
-  return ric.missed_count();
+  if (PrintYoungGenHistoAfterParNewGC && UseParNewGC) {
+    assert(GenCollectedHeap::heap()->n_gens() == 2, "When using ParNew GC, there are only two generations");
+    GenCollectedHeap::heap()->get_gen(0)->object_iterate(&ric);
+    return ric.missed_count();
+  } else {
+    Universe::heap()->object_iterate(&ric);
+    return ric.missed_count();
+  }
 }
 
 void HeapInspection::heap_inspection(outputStream* st) {

src/share/vm/runtime/globals_ext.hpp

@@ -27,6 +27,10 @@
 
 // globals_extension.hpp extension
 #define AJVM_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
+                                                                                \
+  manageable(bool, PrintYoungGenHistoAfterParNewGC, false,                      \
+            "print the young generation class histogram after parNew GC")       \
+
   //add new AJVM specific flags here
 
 

test/gc/parNew/TestPrintYoungGenHistoAfterParNewGC.java

+/*
+ * Copyright (c) 2019 Alibaba Group Holding Limited. 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. Alibaba designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ *
+ */
+
+import java.util.ArrayList;
+
+public class TestPrintYoungGenHistoAfterParNewGC {
+    public static void main(String []args) {
+        int count = 0;
+        ArrayList list = new ArrayList();
+        for (int i = 0; ; i++) {
+            byte[] data = new byte[1024];
+            list.add(data);
+            InnerA aa = new InnerA();
+            InnerA bb = new InnerA();
+            if (i % 100000 == 0) {
+                count++;
+                list.clear();
+                if (count > 1000000) {
+                    break;
+                }
+            }
+        }
+    }
+
+    public static class InnerA {
+        String name;
+        int id;
+        String number;
+        public InnerA() {
+            name = "hello";
+            id = 23333;
+            number = "010110";
+        }
+    }
+}

test/gc/parNew/testPrintYoungGenHisto.sh

+#!/bin/sh
+
+#
+# Copyright (c) 2019 Alibaba Group Holding Limited. 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. Alibaba designates this
+# particular file as subject to the "Classpath" exception as provided
+# by Oracle in the LICENSE file that accompanied this code.
+#
+# 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.
+#
+
+# @test
+# @summary Test for the young generation histogram once after a parnew gc 
+# @build TestPrintYoungGenHistoAfterParNewGC
+# @run shell testPrintYoungGenHisto.sh
+
+TMP1=tmp_$$
+
+# testing set the VM flag PrintYoungGenHistoAfterParNewGC on the fly by using vm tools(jinfo -flag)
+printYongGenHistoTest() {
+    echo "Tetsting setting the PrintYoungGenHistoAfterParNewGC flag by using the vm tools(jinfo -flag)"
+    ${TESTJAVA}/bin/java ${TESTVMOPTS}  -Xmx1g -Xmn500m -verbose:gc -XX:+UseConcMarkSweepGC -XX:+PrintGCDetails \
+                         -cp ${TESTCLASSES} TestPrintYoungGenHistoAfterParNewGC  >${TMP1} 2>&1 &
+    PID=$(ps aux | grep TestPrintYoungGenHistoAfterParNewGC | grep -v "grep" | awk '{print $2}')
+    echo "hello"
+    echo $PID
+    ${TESTJAVA}/bin/jinfo -flag +PrintYoungGenHistoAfterParNewGC $PID
+    sleep 1s
+    cat ${TMP1}
+    RESULT=$(cat ${TMP1} | grep -o 'Total' | wc -l)
+    if [ $RESULT -gt 0 ]
+    then echo "--- passed as expected "
+    else
+        echo "--- failed"
+        exit 1
+    fi
+
+    kill -9 $PID
+}
+
+printYongGenHistoTest
+
+
+rm ${TMP1}