Re: [PATCH v3 3/4] ftrace: add tracepoint for hrtimer

[Peter Zijlstra]

On Thu, 2009-07-23 at 18:01 +0800, Xiao Guangrong wrote:
> 
> Peter Zijlstra wrote:
> 
> > OK, so what you want to measure is the time of the actual callback
> > happening (hrtimer_entry) vs that where you would have expected it to
> > happen (hrtimer_start + delay), right?
> > 
> 
> Yes
> 
> > So what's wrong with printing the expected expiration time in the
> > hrtimer_start tracepoint in the cheap clock units?
> > 
> 
> Is "cheap clock units" means jiffies time?

Nah, something like cpu_clock() which is monotonic per-cpu and should
have high resolution where available.
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