Re: [RFC PATCH 0/5] Generic IPI sending tracepoint

Valentin Schneider
2022-10-11T16:40:26Z

On 11/10/22 18:22, Daniel Bristot de Oliveira wrote:
> On 10/11/22 18:17, Valentin Schneider wrote:
>> Thinking out loud, it makes way more sense to record a cpumask in the
>> tracepoint, but perhaps we could have a postprocessing step to transform
>> those into N events each targeting a single CPU?
>
> My approach on the tracers/rtla is to make the simple things in kernel, and beautify
> things in user-space.
>
> You could keep the tracepoint as a mask, and then make it pretty, like cpus=3-5,8
> in user-space. For example with a trace-cmd/perf loadable plugin, libtracefs helper.
>

That's a nice idea, the one downside I see is that means registering an
event handler for all events with cpumasks rather than directly targeting
cpumask fields, but that doesn't look too horrible. I'll dig a bit in that
direction.

> For rtla I was thinking to make a new tool to parse them. and make it pretty there.
>
> -- Daniel