Split out Downstairs-specific stats #1511
Merged
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(staged on top of #1510)
This removes another bit of awkward plumbing!
Previously, we had to pass an
&UpStatOuter
to any functions in theDownstairs
that needed to update our Oximeter statistics. This PR splits theUpStatOuter
into upstairs versus downstairs components, then stores a (shared) handle to the downstairs half in theDownstairs
itself.The Oximeter interface remains unchanged.
(Making the
Downstairs
more self-sufficient is a step towards doing immediate acks, i.e. eliminatingackable_jobs
and simply sending acks as they become ready)