Re: Shared memory changes in 9.4?

Re: Andres Freund 2014-06-12 <20140612094112(dot)GZ8406(at)alap3(dot)anarazel(dot)de>
> > * Make initdb determine the best shm type for this platform and write
> > it into postgresql.conf as it does now.
> > * If no dynamic_shared_memory_type is found in the config, default to
> > "none".
> > * Modify the three identical error messages concerned about shm
> > segments to include the shm type instead of always just saying
> > "FATAL: could not open shared memory segment"
> > * Add a HINT to the POSIX error message:
> > "HINT: This might indicate that /dev/shm is not mounted, or its
> > permissions do not allow the database user to create files there"
>
> Sounds like a sane plan to me.

Here are two patches, one that implements the annotated error
messages, and one that selects none as default.

It might also make sense to add a Note that POSIX depends on /dev/shm,
and also a Note that dynamic_shared_memory_type is not related to
the shared_buffers shm segments, which I didn't include here.

Christoph
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