On Tue, 11 Oct 2022 17:40:26 +0100
Valentin Schneider wrote:
> > 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 s
On Tue, 11 Oct 2022 17:17:04 +0100
Valentin Schneider wrote:
> tep_get_field_val() just yields an unsigned long long of value 0x200018,
> which AFAICT is just the [length, offset] thing associated with dynamic
> arrays. Not really usable, and I don't see anything exported in the lib to
> extract
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
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 t
+Cc Douglas
On 07/10/22 17:01, Marcelo Tosatti wrote:
> Hi Valentin,
>
> On Fri, Oct 07, 2022 at 04:41:40PM +0100, Valentin Schneider wrote:
>> Background
>> ==
>>
>> As for the targeted CPUs, the existing tracepoint does export them, albeit in
>> cpumask form, which is quite inconvenient
On Fri, 7 Oct 2022 17:01:33 -0300
Marcelo Tosatti wrote:
> > As for the targeted CPUs, the existing tracepoint does export them, albeit
> > in
> > cpumask form, which is quite inconvenient from a tooling perspective. For
> > instance, as far as I'm aware, it's not possible to do event filtering
Hi Valentin,
On Fri, Oct 07, 2022 at 04:41:40PM +0100, Valentin Schneider wrote:
> Background
> ==
>
> Detecting IPI *reception* is relatively easy, e.g. using
> trace_irq_handler_{entry,exit} or even just function-trace
> flush_smp_call_function_queue() for SMP calls.
>
> Figuring out
