Re: [PATCH v2 0/4] tracing: Add Hardware Latency detector tracer

[Peter Zijlstra]

On Wed, Aug 10, 2016 at 09:53:56AM -0400, Steven Rostedt wrote:
> Changes since v1:
> 
>  . Added checks for CONFIG_GENERIC_SCHED_CLOCK, and if that is set,
>    only nmi_counts will be recorded when an NMI is triggered, but not
>    the time in NMI, because the generic sched_clock is not NMI safe.
>    (suggested by Sebastian Andrzej Siewior)

So any of the platforms using GENERIC_SCHED_CLOCK _have_ NMIs ?

In any case, for those you could probably use ktime_get_mono_fast_ns().