Обсуждение: The BUFFER_HIT and BUFFER_MISS probes seem pretty darn redundant

Whilst cleaning up the dtrace probe documentation, I realized that
there is nothing the aforementioned probes tell you that you can't find
out (with a lot more data besides) from the final argument of the
BUFFER_READ_DONE probe.  Furthermore, tallying them as-is would be
misleading since you couldn't distinguish true reads from relation
extension requests.  I think we should just remove them.
        regards, tom lane

Tom Lane wrote:
> Whilst cleaning up the dtrace probe documentation, I realized that
> there is nothing the aforementioned probes tell you that you can't find
> out (with a lot more data besides) from the final argument of the
> BUFFER_READ_DONE probe.  Furthermore, tallying them as-is would be
> misleading since you couldn't distinguish true reads from relation
> extension requests.  I think we should just remove them.
>   
Agreed. The found flag from BUFFER_READ_DONE will serve the same 
purpose. As always, thanks for offering great solutions!

-Robert