[PATCH v2 8/8] drm/xe/pmu: Add PMU support for engine busyness

[Riana Tauro]

On 12/18/2024 7:43 PM, Lucas De Marchi wrote:
> On Wed, Dec 18, 2024 at 10:42:53AM +0530, Riana Tauro wrote:
>> Hi Lucas
>>
>> On 12/13/2024 11:28 AM, Lucas De Marchi wrote:
>>> On Thu, Nov 21, 2024 at 12:09:04PM +0530, Riana Tauro wrote:
>>>> PMU provides two counters (<engine>-busy-ticks-gt<n>,
>>>> <engine>-total-ticks-gt<n>) to calculate engine busyness. When querying
>>>> engine busyness, user must group these 2 counters using the perf_event
>>>> group mechanism to ensure both counters are sampled together.
>>>>
>>>> To list engine busyness counters use the following
>>>>
>>>> ./perf list
>>>>  xe_0000_03_00.0/bcs0-busy-ticks-gt0/               [Kernel PMU event]
>>>
>>> this will need a rebase on latest versions of the pmu patches as we
>>> moved to have gt as a param rather than mangling the event name.
>>
>> In case of multiple gts, there might be different engines for each gt
>> So should we display a common name and unsupported in case the engine 
>> does not belong to the gt?
>>
>> sudo ./perf stat -e xe_0000_00_02.0/vcs0-busy-ticks,gt_id=0/ -I 1000
> 
> why is engine not a param, like gt?
are you suggesting to have both engine and instance too as parameters?
Something like this?

xe_0000_00_02.0/busy-ticks,engine_class=1,engine_instance=0,gt_id=0/


> 
> Lucas De Marchi