1154000 - Split off another iGC slice if background thread is not ready

Status: NEW

(Core :: JavaScript: GC, defect)

Description

[Steve Fink [:sfink] [:s:]]

One of my GCs spent 73ms waiting for the background thread before continuing on to spend a bunch more time in the last slice of an incremental GC.

It would be better if it had waited for the budgeted amount, then given up and returned to the mutator to try again.

Related: even if waiting for the background thread doesn't consume the whole budget, it would probably still be better to queue up a separate slice if it takes more than a couple of ms.