Re: [PATCH V5] irq: Track the interrupt timings

[Thomas Gleixner]

On Tue, 14 Jun 2016, Nicolas Pitre wrote:
> What about simply this:
> 
> void __handle_timings(struct irq_desc *desc)
> {
>       struct irq_timings *timings = this_cpu_ptr(desc->timings);
>       timings->w_index = (timings->w_index + 1) & IRQ_TIMINGS_MASK;
>       timings->values[timings->w_index] = local_clock();
> }
> 
> ?
> 
> Then you could s/__handle_timings/__record_irq_time/ to better represent 
> what it does.  And both the difference and the summing of squares could 
> be done upon entering idle instead.

And make it part of the handle_timings() inline to avoid the function call.

Thanks,

        tglx