[PATCH 12/12] accel/ivpu: Share NPU busy time in sysfs

[Jacek Lawrynowicz]

Hi,

On 10.05.2024 18:55, Jeffrey Hugo wrote:
> On 5/8/2024 7:29 AM, Jacek Lawrynowicz wrote:
>> From: Tomasz Rusinowicz <tomasz.rusinowicz at intel.com>
>>
>> The driver tracks the time spent by NPU executing jobs
>> and shares it through sysfs `npu_busy_time_us` file.
>> It can be then used by user space applications to monitor device
>> utilization.
>>
>> NPU is considered 'busy' starting with a first job submitted
>> to firmware and ending when there is no more jobs pending/executing.
>>
>> Signed-off-by: Tomasz Rusinowicz <tomasz.rusinowicz at intel.com>
>> Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz at linux.intel.com>
> 
> This feels like something that would normally be handled by perf. Why not use that mechanism?

Yeah, probably but we had several request to provide easy to use interface for this metric that
could be integrated in various user space apps/tools that do not use ftrace.