Re: [PATCH v3 1/3] perfevent_pmda: Add extension for perf derived events

[Hemant Kumar <hemant@xxxxxxxxxxxxxxxxxx>]

Hi Nathan,

On 02/11/2016 07:40 AM, Nathan Scott wrote:
> Hi Hemant,
>
> ----- Original Message -----
> > This patch gives the ability to perfevent agent to monitor derived
> > [...]
> I've found one small issue with this just now - when we have no newly
> derived metrics, we can see this...
>
> $ pminfo -v perfevent
> perfevent.derived: pmLookupDesc: Unknown or illegal metric identifier
>
> I guess this is because there's nothing handling that (dynamic pmns)
> node when no derived metrics are configured.
>
> One solution might be to add a metric permanently below that point,
> that is instantiated both with and without derived perfevent counts
> e.g. perfevent.derived.active (mirror the existing perfevent.active)
> - a count of #derived metrics - zero valued in the default case.
Right. Sent a patch to add a metric perfevent.derived.active and
that should fix the warning.
http://www.pcp.io/pipermail/pcp/2016-February/009610.html

Thanks for the suggestion!

> cheers.
>
> --
> Nathan
--
Thanks,
Hemant Kumar