brak katalogu w dev? - tmpfs w /dev/shm

[Tomasz Pala]

Configure.help podaje:

CONFIG_TMPFS
[...]
  You should mount the file system somewhere to be able to use
  POSIX shared memory. Adding the following line to /etc/fstab should
  take care of things:

  tmpfs         /dev/shm        tmpfs           defaults        0 0

  Remember to create the directory that you intend to mount tmpfs on
  if necessary (/dev/shm is automagically created if you use devfs).
[...]
  The initial permissions of the root directory can be set with the
  mount option "mode".

filesystems/tmpfs.txt:

2) glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
   POSIX shared memory (shm_open, shm_unlink). Adding the following
   line to /etc/fstab should take care of this:

        tmpfs   /dev/shm        tmpfs   defaults        0 0

   Remember to create the directory that you intend to mount tmpfs on
   if necessary (/dev/shm is automagically created if you use devfs).

   This mount is _not_ needed for SYSV shared memory. The internal
   mount is used for that. (In the 2.3 kernel versions it was
   necessary to mount the predecessor of tmpfs (shm fs) to use SYSV
   shared memory)

W związku z tym następujące pytania:
1. czy to w ogóle jest używane i potrzebne? - jeśli tak to należy dodać:
 a) katalog do dev,
 b) domyślny wpis w fstab.
2. jakie powinny być prawa do tego katalogu? (opcja mode)

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