Re: Incorrect IPC advice for OpenBSD

On Wed, May 16, 2018 at 10:45 PM, Daniel Gustafsson <daniel@yesql.se> wrote:

The OpenBSD paragraph in the "Shared Memory and Semaphores” section seems to
have been slightly incorrect since around 2002.  The kern.ipc.shm_use_phys
sysctl setting has never existed in OpenBSD (it is in NetBSD and FreeBSD) and
SEMMAP is not a kernel configuration option.  Further, there is no kernel
config for locking shared memory into RAM so the whole paragraph is best
removed it seems.  I believe this is an artifact from FreeBSD and OpenBSD
sharing a paragraph, which was split into separate ones a long time ago.

The attached patch removes the above mentioned parts (confirmed with an OpenBSD
developer).  This should probably be backpatched to all supported versions as
it’s been wrong for a long time.