Re: Summary function for pg_buffercache

Hi hackers,

> > I suggest we focus on saving the memory first and then think about the
> > performance, if necessary.
>
> +1

I made a mistake in v3 cfbot complained about. It should have been:

```
if (RelFileNumberIsValid(BufTagGetRelNumber(&bufHdr->tag)))
```

Here is the corrected patch.

-- 
Best regards,
Aleksander Alekseev