RFR: Clear outgoing matrix for root regions during preparation phase

Roman Kennke rkennke at redhat.com
Wed Mar 22 15:16:28 UTC 2017

We're currently clearing the outgoing matrix for root regions during the
collection phase of partial GC. I find it more natural to do it in the
preparation phase. While it's not per-se incorrect (only one thread
should have to do with each root region at a time), I'm a bit uneasy to
have threads clearing whole rows, while other threads are updating the
matrix. They *should* not collide, but I'll sleep better if we could
just do it during preparation. It also means to move verification up
before preparation, because otherwise whole rows will be cleared.



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