Re: Add the ability to limit the amount of memory that can be allocated to backends.

At Wed, 31 Aug 2022 12:50:19 -0400, Reid Thompson <reid.thompson@crunchydata.com> wrote in 
> Hi Hackers,
> 
> Add the ability to limit the amount of memory that can be allocated to
> backends.

The patch seems to limit both of memory-context allocations and DSM
allocations happen on a specific process by the same budget. In the
fist place I don't think it's sensible to cap the amount of DSM
allocations by per-process budget.

DSM is used by pgstats subsystem. There can be cases where pgstat
complains for denial of DSM allocation after the budget has been
exhausted by memory-context allocations, or every command complains
for denial of memory-context allocation after once the per-process
budget is exhausted by DSM allocations. That doesn't seem reasonable.


regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center