What does that mean of PgIn[ST3P], RdMeta[ST3UP] when use fs_usage in osx
From the fs_usage man page:


  CALL  The name of the network or filesystem related call, page-in, page-out, or physical disk access.


PgIn and PgOut are page-in and page-out.
RdMeta and WrMeta are reading and writing file metadata.
RdData and WrData are reading and writing to the file.