Re: [RFC 2/3] preempt_tracer: Disable IRQ while starting/stopping due to a preempt_counter change

[Steven Rostedt]

On Wed, 29 May 2019 15:49:46 +0200
Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:


> > That's basically what I was suggesting as the solution to this ;-)  
> 
> You were wanting changes to preempt_disable() and task_struct, neither
> of which is required. The above only needs some per-cpu storage in the
> tracer implementation.

Only changes were to the trace preempt_disable() code. Which I still
think needs to be done regardless to differentiate between when we are
tracing preempt disable and when we are not.

And no modification would need to be done to task_struct as we already
have a place to add tracing flags.

-- Steve