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

[Lucas De Marchi]

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?

Lucas De Marchi