Re: [patch] rt: sysprof hrtimer fix

Ingo Molnar
2009-02-13T12:49:52Z

* Frederic Weisbecker <fweisbec@gmail.com> wrote:

> So, just a thing.
> -rt make the hrtimer's timers running on softirq context because the hrtimer_interrupt
> doesn't run as a threaded interrupt, and then it is not preemptible right?
>
> In that case, sysprof will continue to run in hardirq context, as before, and
> it will considerably increase the latency. And that matters here.
> So I think it is important to put it on the reminder:

hm, not sure. Do you know it numerically how much worst-case overhead it
induces?

Ingo