/*
* Copyright (c) 2008, 2015, 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 com.sun.btrace.samples;
import com.sun.btrace.annotations.*;
import static com.sun.btrace.BTraceUtils.*;
import java.lang.management.MemoryUsage;
/**
* This sample traces memory threshold exceeds.
* You need to specify the memory pool to watch
* out and the usage threshold. You can write
* script that dumps heap by dumpHeap on crossing
* the threshold instead of just printing a message.
* Note that the name of the old gen is dependent on
* GC algorithm. With ParallelGC, the name is "PS Old Gen".
*/
@BTrace
public class MemAlerter {
@OnLowMemory(
pool = "Tenured Gen",
threshold=6000000
)
public static void onLowMem(MemoryUsage mu) {
println(mu);
}
}