mainClassName LinuxProcessSizeDetector

set flag Reparse.

set flag LeanMode.

set flag l_withoutReflection.

set flag NoAutoGunzip.

do not include function get.

sbool linux_rssFixedForZGC_verbose;

public static long linux_rssFixedForZGC() throws IOException {

  ret linux_rssFixedForZGC(processID_int());

}

public static long linux_rssFixedForZGC(int pid) throws IOException {

  //if (!is64BitLinux()) fail("Not on 64 Bit Linux");

  S range = null;

  new TreeMap<S, Long> rssByRange;

  Pattern patAddr = Pattern.compile("^([0-9a-f]{1,16})-");

  temp BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("/proc/" + pid + "/smaps")));

  S s;

  while ((s = in.readLine()) != null) {

    Matcher m = patAddr.matcher(s);

    S addr = m.find() ? m.group(1) : null;

    if (addr != null) {

      //print("Have address: " + addr);

      S cleanedAddr = longToHex(parseUnsignedHexLong(addr) & ~((1L << 42)-1));

      range = takeFirst_string(6, cleanedAddr);

      continue;

    } // else print("Not range: " + s);

    S[] p = parseColonProperty_array(s);

    if (eqic(first(p), "rss")) {

      long size = Long.parseLong(beforeSpace(p[1]));

      if (size != 0)

        rssByRange.put(range, getOrCreate_long(rssByRange, range) + size);

    }

  }

  if (linux_rssFixedForZGC_verbose)

    for (Map.Entry<S, Long> e : rssByRange.entrySet()) {

      System.out.println("Address range " + rpad(e.getKey(), 16, 'x') + ": " + toK(e.getValue()) + " MB");

    }

  Long min = null;

  for (S _range : ll("000004", "000008", "000010", "00007c")) {

    Long l = rssByRange.get(_range);

    if (l != null) min = min == null ? l : Math.min(min, l);

  }

  long total = 0;

  for (long l : rssByRange.values()) total += l;

  long guess = min == null ? total : total-min*3;

  ret guess*1024;

}