Find usages - usually doesn't work

This is part of source code:

  try
    _file_name := gl_errors_path + '/' + 'exceptions.txt';
    AssignFile(_journal, _file_name);
    try
      if not FileExists(_file_name)
      then Rewrite(_journal)
      else Append(_journal);
      _s := '-----------------' + DateToStr(Now()) + ' - ' + TimeToStr(Now()) + ' --------------------';
      WriteLn(_journal, _s);
        _s := _s + ' MEM APP: ' + IntToStr(GetUsedMemory())
        + ' RAM: '          + IntToStr(GetTotalRAM())
        + ' SWAP: '         + IntToStr(GetTotalSwap())
        + ' FREE RAM: '     + IntToStr(GetFreeRAM())
        + ' FREE SWAP: '    + IntToStr(GetFreeSwap());
      WriteLn(_journal, _s);
      WriteLn(_journal, sFunction);
      WriteLn(_journal, sException);
      WriteLn(_journal, sText);
    finally
      CloseFile(_journal);
    end;

This is part of another unit:

function  GetUsedMemory()    : integer;
function  GetUptime()        : integer;
function  GetTotalRAM()      : Longword;
function  GetFreeRAM()       : Longword;
function  GetSharedRAM()     : Longword;
function  GetBuffersRAM()    : Longword;
function  GetTotalSwap()     : Longword;
function  GetFreeSwap()      : Longword;
function  GetProcessesCount(): Word;
function  GetSysInfo()       : PSysInfo;

When I try find usages for GetUsedMemory() I use find usages (alt + F7) and I have correct answer - like this:

But when I try find other functions (GetTotalRAM, or GetTotalSwap, etc), I have answer "No usages found in All Places", even if I use ctrl+alt+sh + F7, still no results.

I need this function very badly, I have a lot of refactoring to do, and "find usages" is usually very helpful with this.

Regards

Daniel Roziecki

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