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docs: add missing IPC documentation in sysctl/kernel.rst 

This adds short descriptions of msgmax, msgmnb, msgmni, and shmmni,
which were previously listed in kernel.rst but not described.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Stephen Kitt 2020-02-18 13:59:19 +01:00 committed by Jonathan Corbet
parent a474105bb6
commit fa5b526411
1 changed files with 12 additions and 0 deletions
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12
Documentation/admin-guide/sysctl/kernel.rst
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@ -410,6 +410,15 @@ to false. Generally used with the `kexec_load_disabled`_ toggle.
msgmax, msgmnb, and msgmni
==========================
``msgmax`` is the maximum size of an IPC message, in bytes. 8192 by
default (``MSGMAX``).
``msgmnb`` is the maximum size of an IPC queue, in bytes. 16384 by
default (``MSGMNB``).
``msgmni`` is the maximum number of IPC queues. 32000 by default
(``MSGMNI``).
msg_next_id, sem_next_id, and shm_next_id (System V IPC)
========================================================
@ -958,6 +967,9 @@ kernel. This value defaults to ``SHMMAX``.
shmmni
======
This value determines the maximum number of shared memory segments.
4096 by default (``SHMMNI``).
shm_rmid_forced
===============