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SubjectRe: [PATCH] sched: Add trace events for Proxy Execution (PE)
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On 21/02/2024 2:23 pm, Steven Rostedt wrote:
> On Fri, 2 Feb 2024 08:33:38 +0000
> Metin Kaya <metin.kaya@arm.com> wrote:
>
>> Add sched_[start, finish]_task_selection trace events to measure the
>> latency of PE patches in task selection.
>>
>> Moreover, introduce trace events for interesting events in PE:
>> 1. sched_pe_enqueue_sleeping_task: a task gets enqueued on wait queue of
>> a sleeping task (mutex owner).
>> 2. sched_pe_cross_remote_cpu: dependency chain crosses remote CPU.
>> 3. sched_pe_task_is_migrating: mutex owner task migrates.
>>
>> New trace events can be tested via this command:
>> $ perf trace \
>> -e sched:sched_start_task_selection \
>> -e sched:sched_finish_task_selection \
>> -e sched:sched_pe_enqueue_sleeping_task \
>> -e sched:sched_pe_cross_remote_cpu \
>> -e sched:sched_pe_task_is_migrating
>>
>> Notes:
>> 1. These trace events are not intended to merge upstream. Instead, they
>> are only for making PE tests easier and will be converted to trace
>> points once PE patches hit upstream.
>
> I wonder if the tracepoints should be added though? That is, not adding the
> trace_events that show up in tracefs, but just the tracepoints so that bpf
> or local modules could hook to them?

Yep, the intention is providing necessary support for modules (e.g.,
https://github.com/ARM-software/lisa/blob/main/lisa/_assets/kmodules/lisa/tp.c).


>
> -- Steve
>
>
>> 2. This patch is based on John's Proxy Execution v7 patch series (see
>> the link below) which is also available at
>> https://github.com/johnstultz-work/linux-dev/commits/proxy-exec-v7-6.7-rc6/.
>>
>> Link: https://lore.kernel.org/linux-kernel/CANDhNCrHd+5twWVNqBAhVLfhMhkiO0KjxXBmwVgaCD4kAyFyWw@mail.gmail.com/
>


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