Re: pgsql: Add function to get memory context stats for processes

Robert Haas <robertmhaas@gmail.com> writes:
> My primary concern about the patch is that
> ProcessGetMemoryContextInterrupt() can be called from any
> CHECK_FOR_INTERRUPTS() and calls lots of DSA functions, including
> dsa_create() and, via PublishMemoryContext(), dsa_allocate0(). I'm
> shocked to hear that you and Andres think that's safe to do at any
> current or future CHECK_FOR_INTERRUPTS() anywhere in the code; but
> Andres seems very confident that it's fine, so perhaps I should just
> stop worrying and be happy that we have the feature.

Just for the record, it sounds quite unsafe to me too.  I could
credit it being all right to examine the process' MemoryContext data
structures, but calling dsa_create() from CFI seems really insane.
Way too many moving parts there.

            regards, tom lane