Re: [RFC PATCH v3 0/3] Introduce BPF map tracing capability

[Jamal Hadi Salim]

On 2021-11-03 13:12, Joe Burton wrote:
> That's a good point. Since the probe is invoked before the update takes
> place, it would not be possible to account for the possibility that the
> update failed.
>
> Unless someone wants the `pre update' hook, I'll simply adjust the
> existing hooks' semantics so that they are invoked after the update.
> As discussed, this better suits the intended use case.

If the goal is to synchronize state between two maps (if i understood
correctly the intent) then it is more useful to go post-update.

cheers,
jamal