linux/fs/proc/inode-alloc.txt
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   1Current inode allocations in the proc-fs (hex-numbers):
   2
   3  00000000              reserved
   4  00000001-00000fff     static entries  (goners)
   5       001              root-ino
   6
   7  00001000-00001fff     unused
   8  0001xxxx-7fffxxxx     pid-dir entries for pid 1-7fff
   9  80000000-efffffff     unused
  10  f0000000-ffffffff     dynamic entries
  11
  12Goal:
  13        a) once we'll split the thing into several virtual filesystems we
  14        will get rid of magical ranges (and this file, BTW).
  15