bundles/org.simantics.nativemem/src/org/simantics/nativemem/internal/linux/Stat.java

   1 /*******************************************************************************
   2  * Copyright (c) 2017 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     Semantum Oy - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.nativemem.internal.linux;
  13
  14 import java.io.BufferedReader;
  15 import java.io.IOException;
  16 import java.nio.charset.Charset;
  17 import java.nio.file.Files;
  18 import java.nio.file.Paths;
  19
  20 import org.simantics.nativemem.internal.Resource;
  21
  22 /**
  23  * @author Tuukka Lehtonen
  24  * @since 1.29.0
  25  */
  26 public class Stat {
  27
  28         private static final String SELF_STATM = "/proc/self/statm";
  29         private static final Charset ASCII = Charset.forName("US-ASCII");
  30
  31         public static long getCurrentRSS(Resource r) {
  32                 try (BufferedReader rdr = Files.newBufferedReader(Paths.get(SELF_STATM), ASCII)) {
  33                         String line = rdr.readLine();
  34                         String[] nums = line.split(" ");
  35                         if (nums.length == 0)
  36                                 return 0L;
  37                         long rss = Long.parseLong(nums[0]);
  38                         long pageSize = r.sysconf(Resource._SC_PAGESIZE);
  39                         return rss * pageSize;
  40                 } catch (NumberFormatException e) {
  41                         return 0L;
  42                 } catch (IOException e) {
  43                         return 0L;
  44                 }
  45         }
  46
  47 }