Re: pg_stat_lwlocks view - lwlocks statistics, round 2

Satoshi Nagayasu <snaga@uptime.jp> writes:
> Ok, I guess we have reached the consensus to have
> "some flight-recorder". Right?

I remain unconvinced.  I think the argument that this will promote
novice understanding is complete hogwash: making any sense of
lwlock-level stats will require deep PG understanding, not create it.
And despite Jeff's optimistic views upthread, I don't think very many
people have or will acquire such understanding.  So I'm really resistant
to accepting even minimal overhead in pursuit of this goal --- and I
do not believe the overhead will be minimal, either.
        regards, tom lane