stopping ftrace on event

stopping ftrace on event

[Benjamin Steinke]

Hi all,

I'm hunting sporadic high irq-handler latencies in a pcie driver by using 
ftrace. I'm currently using trace-cmd record but get way to large files due to 
the event being so infrequent.

Is there a way to stop tracing or dump the current trace buffer when a specific 
event occurs?

Thanks for your help,
Benjamin

Re: stopping ftrace on event

[Daniel Bristot de Oliveira]

On 7/6/22 10:50, Benjamin Steinke wrote:
> Hi all,
> 
> I'm hunting sporadic high irq-handler latencies in a pcie driver by using 
> ftrace. I'm currently using trace-cmd record but get way to large files due to 
> the event being so infrequent.
> 
> Is there a way to stop tracing or dump the current trace buffer when a specific 
> event occurs?

https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers ?

-- Daniel
> Thanks for your help,
> Benjamin
> 
> 
> 
> 

Re: stopping ftrace on event

[Benjamin Steinke]

Am Mittwoch, 6. Juli 2022, 13:31:00 CEST schrieb Daniel Bristot de Oliveira:
> On 7/6/22 10:50, Benjamin Steinke wrote:
> > Hi all,
> > 
> > I'm hunting sporadic high irq-handler latencies in a pcie driver by using
> > ftrace. I'm currently using trace-cmd record but get way to large files
> > due to the event being so infrequent.
> > 
> > Is there a way to stop tracing or dump the current trace buffer when a
> > specific event occurs?
> 
> https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers ?

Oh, didn't see the forest for the trees. I probably scrolled a number of times 
over this section. Thanks a lot. 

> 
> -- Daniel
> 
> > Thanks for your help,
> > Benjamin