--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/jfr/internal/settings/CutoffSetting.java	2019-01-29 11:00:18.172427700 +0800
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2018, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle 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.
+ *
+ * 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.internal.settings;
+
+import java.util.Objects;
+import java.util.Set;
+
+import jdk.jfr.BooleanFlag;
+import jdk.jfr.Description;
+import jdk.jfr.Label;
+import jdk.jfr.MetadataDefinition;
+import jdk.jfr.Name;
+import jdk.jfr.internal.Control;
+import jdk.jfr.internal.PlatformEventType;
+import jdk.jfr.internal.Type;
+import jdk.jfr.internal.Utils;
+
+@MetadataDefinition
+@Label("Cutoff")
+@Description("Limit running time of event")
+@Name("com.oracle.jfr.settings.Cutoff")
+@BooleanFlag
+public final class CutoffSetting extends Control {
+    private final static long typeId = Type.getTypeId(CutoffSetting.class);
+
+    private String value = "0 ns";
+    private final PlatformEventType eventType;
+
+    public CutoffSetting(PlatformEventType eventType, String defaultValue) {
+       super(defaultValue);
+       this.eventType = Objects.requireNonNull(eventType);
+    }
+
+    @Override
+    public String combine(Set<String> values) {
+        long max = 0;
+        String text = "0 ns";
+        for (String value : values) {
+            long l = parseValue(value);
+            if (l > max) {
+                text = value;
+                max = l;
+            }
+        }
+        return text;
+    }
+
+    @Override
+    public void setValue(String value) {
+        long l = parseValue(value);
+        this.value = value;
+        eventType.setCutoff(l);
+    }
+
+    private long parseValue(String value) {
+        return isInfinity(value) ? Long.MAX_VALUE : Utils.parseTimespan(value);
+    }
+
+    @Override
+    public String getValue() {
+        return value;
+    }
+
+    public static boolean isType(long typeId) {
+        return CutoffSetting.typeId == typeId;
+    }
+
+    private static boolean isInfinity(String s) {
+        return s.equals("infinity");
+    }
+
+    public static long parseValueSafe(String value) {
+        if (value == null) {
+            return 0L;
+        }
+        try {
+            return isInfinity(value) ? Long.MAX_VALUE : Utils.parseTimespan(value);
+        } catch (NumberFormatException nfe) {
+            return 0L;
+        }
+    }
+}