[igt-dev] [PATCH i-g-t] lib/i915/perf: rework perf counters equations

[Petri Latvala]

On Thu, Sep 10, 2020 at 01:54:00PM +0300, Lionel Landwerlin wrote:
> On 10/09/2020 13:41, Petri Latvala wrote:
> > On Thu, Sep 10, 2020 at 01:15:32PM +0300, Lionel Landwerlin wrote:
> > > Working with an offset means we can have the PERFCNT snapshots stored
> > > at an offset in the existing accumulator rather than having a specific
> > > accumulator just for them.
> > > 
> > > This isn't really useful for IGT because it only looks at the OA
> > > buffer where those registers aren't stored, but it is useful for perf
> > > queries in Mesa.
> > > 
> > > This bumps the version of the i915_perf library to reflect the API
> > > change (see perf.h).
> > For older versions of Mesa that cannot use this version, what's the
> > method of getting a compatible i915-perf? Is it "checkout this older
> > git commit"?
> > 
> > 
> Mesa doesn't use the igt library (so far it's only used by the tools &
> gpuvis), only pulling in the xml files at given point.

Ah, right.

I'm making an assumption that you tested both gpuvis and Mesa with
this change so

Acked-by: Petri Latvala <petri.latvala at intel.com>