org.elasticsearch.common.jna.Natives Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch licenses this
* file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.jna;
import java.util.Locale;
import com.sun.jna.Native;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
/**
*
*/
public class Natives {
private static ESLogger logger = Loggers.getLogger(Natives.class);
public static void tryMlockall() {
int errno = Integer.MIN_VALUE;
try {
int result = CLibrary.mlockall(CLibrary.MCL_CURRENT);
if (result != 0)
errno = Native.getLastError();
} catch (UnsatisfiedLinkError e) {
// this will have already been logged by CLibrary, no need to repeat it
return;
}
if (errno != Integer.MIN_VALUE) {
if (errno == CLibrary.ENOMEM && System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("linux")) {
logger.warn("Unable to lock JVM memory (ENOMEM)."
+ " This can result in part of the JVM being swapped out."
+ " Increase RLIMIT_MEMLOCK or run elasticsearch as root.");
} else if (!System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("mac")) {
// OS X allows mlockall to be called, but always returns an error
logger.warn("Unknown mlockall error " + errno);
}
}
}
}