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

[Jamal Hadi Salim]

On 2021-11-04 06:59, Jamal Hadi Salim wrote:
> 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.

To complete that thought: Only positive results are interesting.
For example if the command was to delete an entry which doesnt
exist there is no point in reporting that (or is there?).
OTOH, a successful delete is useful...

cheers,
jamal