Messages in this thread Patch in this message | | | Date | Mon, 4 May 2015 15:10:05 +0000 (UTC) | From | Mathieu Desnoyers <> | Subject | Re: [PATCH] ftrace: Provide trace clock monotonic raw |
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----- Original Message ----- > Expose the NMI safe accessor to the monotonic raw clock to the > tracer. The mono clock was added with commit > 1b3e5c0936046e7e023149ddc8946d21c2ea20eb. Although the monotonic raw > clock cannot be used to compare time between different machines, it is > not perterbed by ntp.
perterbed -> perturbed
> > Signed-off-by: Drew Richardson <drew.richardson@arm.com> >
What is the use-case that justify exposing the "raw fast" clock that cannot be handled by the "monotonic fast" clock ?
Thanks,
Mathieu
> --- > kernel/trace/trace.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c > index 05330494a0df..458031c31a37 100644 > --- a/kernel/trace/trace.c > +++ b/kernel/trace/trace.c > @@ -876,6 +876,7 @@ static struct { > { trace_clock_jiffies, "uptime", 0 }, > { trace_clock, "perf", 1 }, > { ktime_get_mono_fast_ns, "mono", 1 }, > + { ktime_get_raw_fast_ns, "mono_raw", 1 }, > ARCH_TRACE_CLOCKS > }; > > -- > 2.1.4 > >
-- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
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