Re: RFC: replace pg_stat_activity.waiting with something more descriptive

On Mon, Jun 22, 2015 at 1:59 PM, David G. Johnston
<david.g.johnston@gmail.com> wrote:
> In addition to the codes themselves I think it would aid less-experienced
> operators if we would provide a meta-data categorization of the codes.
> Something like, I/O Sub-System; Storage Maintenance; Concurrency, etc..
>
> There could be a section in the documentation with these topics as section
> headings and a listing and explanation of each of the possible code would
> then be described within.
>
> The meta-information is already embedded within the code/descriptions but
> explicitly pulling them out would be, IMO, more user-friendly and likely
> also aid in triage and speed-of-recognition when reading the corresponding
> code/description.

I was thinking that the codes would probably be fairly straightforward
renderings of the underlying C identifiers, e.g.:

Lock (Relation)
Lock (Relation Extension)
Lock (Page)
...
...
LWLock (ShmemIndexLock)
LWLock (OidGenLock)
LWLock (XidGenLock)
LWLock (ProcArrayLock)
...
...
Spin Lock Delay
Buffer Cleanup Lock

We'd then have to figure out how to document that stuff.