Re: [HACKERS] exposing wait events for non-backends (was: Trackingwait event for latches)

So, one of the problems in this patch as committed is that for any
process that doesn't show up in pg_stat_activity, there's no way to
see the wait event information.  That sucks.  I think there are
basically two ways to fix this:

1. Show all processes that have a PGPROC in pg_stat_activity,
including auxiliary processes and whatnot, and use some new field in
pg_stat_activity to indicate the process type.

2. Add a second view, say pg_stat_system_activity, to show the
processes that don't appear in pg_stat_activity.  A bunch of columns
could likely be omitted, but there would be some duplication, too.

Preferences?