[PATCH] mempool: introduce statistics reset function

[Morten Brørup]

> From: Andrew Rybchenko [mailto:andrew.rybchenko at oktetlabs.ru]
> Sent: Tuesday, 24 February 2026 07.29
> 
> On 2/23/26 1:20 PM, Morten Brørup wrote:
> > Populating a mempool with objects is accounted for in the statistics.
> > When analyzing mempool cache statistics, this may distort the data.
> > In order to simplify mempool cache statistics analysis, a mempool
> > statistics reset function was added.
> >
> > Furthermore, details about average burst sizes and mempool cache miss
> > rates were added to the statistics shown when dumping a mempool.
> >
> > Signed-off-by: Morten Brørup <mb at smartsharesystems.com>
> 
> I'd like to see thoughts about consistency after reset taking into
> account that reset will likely to be done from control core whereas
> stats are updated from data cores. Results could be very interesting.
> I guess it is not the reason to introduce locking or any other kind
> of synchronization, but user should be warned as the bare minimum.

When used for cache statistics analysis, the reset function will be called once only: After everything has been initialized (mempool created and populated, and ethdev Rx queues preloaded with mbufs), but before the data plane is started.

I don't think the end user should be warned; this may be normal behavior for an application.
In addition to the trace event, I'll add a DEBUG level log message in the function.

And a warning about potential inconsistency in the function description.

Good feedback, Andrew!