Re: [RFC][PATCH 4/3] tracing: Add NMI tracing in hwlat detector

[Steven Rostedt]

On Fri, 5 Aug 2016 17:40:43 +0200
Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> wrote:


> > Ah, this is when we have GENERIC_SCHED_CLOCK, which would break tracing
> > if any arch that has this also has NMIs. Probably need to look at arm64.  
> 
> arm64 should use the generic code as they don't provide sched_clock()
> (and I doubt they go for the weak jiffy version).

And I'm guessing that arm64 supports NMIs. Is there no NMI safe clock?
I probably need to look at the tracing code. Because you can have the
same issue while tracing in an NMI as well.

-- Steve