Re: [RFC 0/5] Per-client engine stats

Chris Wilson
2018-02-15T09:48:02Z

Quoting Tvrtko Ursulin (2018-02-15 09:44:58)
>
> On 14/02/2018 19:20, Chris Wilson wrote:
> > Quoting Tvrtko Ursulin (2018-02-14 18:50:30)
> >> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> >>
> >> Another re-post of my earlier, now slightly updated work, to expose a DRM client
> >> hierarchy in sysfs in order to enable a top like tool:
> >
> > So what I don't like about it is that it is a new interface in sysfs. We
> > already have a PMU interface for statistics and would rather see that
> > extended than abandoned. If perf can handle new processes coming and
> > going, surely we can handle new clients? :|
>
> I don't think it means abandoning the PMU, just that I don't see it
> suitable for this use case.
>
> Even if we go with adding a PMU task mode, that is a separate thing from
> this. It would allow profiling of a single task, but not enumerating and
> profiling all clients/tasks from perf/PMU.

I think perf top seems to handle processes coming and going, so I don't
think it's a fundamental limitation of perf, just our understanding :)

I'd rather have one interface to maintain :)
-Chris