Re: Add WAL read stats to pg_stat_wal

At Mon, 20 Feb 2023 20:15:00 +0530, Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> wrote in 
> Having said that, what's the problem if we use shared memory to report
> the shutdown checkpoint to the postmaster? In case of abnormal
> shutdown where shared memory gets corrupted, we don't even write a
> shutdown checkpoint, no? In such a case, the postmaster doesn't send
> SIGUSR2 to the checkpointer, instead it sends SIGQUIT. AFICS, using
> shared memory doesn't seem to have any problem. Do you have any other
> thoughts in mind?

I had a baseless belief that postmaster doesn't touch shared memory,
but as Andres suggested, SendPostmasterSignal() already does that.

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center