Re: Future of NOHZ full/isolation development (was Re: [NOHZ] Remove scheduler_tick_max_deferment)

[Viresh Kumar]

On 12 November 2014 19:24, Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote:
> I'd rather leave that to tracepoints. Like trace_hrtimer_spurious().

Yeah, it was just to prove things right on the console without getting
into traces.

> Or better yet: have trace_hrtimer_interrupt() which we can compare against
> trace_hrtimer_expire_entry/exit() to check if any hrtimer callback have run
> in the interrupt. This way we avoid workarounds like the above count.

Yeah, I also believe we better add this debug information to mainline kernel.
I will try to get a patch for that soon.

Would it be recommended to add both trace points?
i.e. trace_hrtimer_interrupt() and trace_hrtimer_spurious() ?

--
viresh
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