Hi,
On 2022-02-25 13:01:26 +0800, Julien Rouhaud wrote:
> On Thu, Feb 24, 2022 at 08:44:08PM +0000, Jacob Champion wrote:
> >
> > Yeah... I was following a similar track with the initial work last
> > year, but I dropped it when the cost of implementation started to grow
> > considerably. At the time, though, it looked like some overhauls to the
> > stats framework were being pursued? I should read up on that thread.
>
> Do you mean the shared memory stats patchset? IIUC this is unrelated, as the
> beentry stuff Michael was talking about is a different infrastructure
> (backend_status.[ch]), and I don't think there are any plans to move that to
> dynamic shared memory.
Until a year ago the backend_status.c stuff was in in pgstat.c - I just split
them out because of the shared memory status work - so it'd not be surprising
for them to mentally be thrown in one bucket.
Basically the type of stats we're trying to move to dynamic shared memory is
about counters that should persist for a while and are accumulated across
connections etc. Whereas backend_status.c is more about tracking the current
state (what query is a backend running, what user, etc).
They're not unrelated though: backend_status.c feeds pgstat.c with some
information occasionally.
Greetings,
Andres Freund
