Andres Freund <andres(at)anarazel(dot)de> writes:
> Looking into it.
I wonder whether we shouldn't just revert this patch altogether.
Certainly, extra reads of pg_control are not a noticeable performance
problem. I'm now quite worried about whether we aren't introducing
hazards of using stale values from the file; if a system crash isn't
enough to get it to flush its cache, then what is?
regards, tom lane