On 2020-02-20 02:01, Adrian Chadd wrote:
Questions:
* are these things recursive?
Yes.
* what are the rules around sleeping? I've seen some ... discussions
that were quite animated around this.
Any non-sleepable lock is allowed under EPOCH(9).
* what should I be doing as an epoch tracker if I could call the
receive routine from multiple paths. I see a few drivers have a single
place where they're doing EPOCH_ENTER/EPOCH_EXIT using an epoch
tracker allocated in the interrupt handler stack, but what if I also
want to call that receive path from another function path too? Can I
just stuff an epoch_tracker on the stack and it'll DTRT ?
Try:
https://reviews.freebsd.org/D23674
* .. is there some updated doc or brain dump somewhere I can read? I'd
like to go add this to a couple out of tree wifi drivers under
development so this would make that whole thing much easier.
Gleb ???
--HPS
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