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