Em Mon, Nov 16, 2015 at 01:08:15PM -0500, Frank Ch. Eigler escreveu:
> Olga.Kornievskaia wrote:
> > [...] say there are two tracepoints ?foobar_enter? and
> > ?foobar_exit?. Each tracepoint logs a timestamp. I?d like to be able
> > to say that on average it takes that many time-units between ?enter?
> > and ?exit? tracepoints. [...]
> For completeness, a complete systemtap implementation of this could look like:
> # stap -e '
> global s, t%
> probe kernel.trace("foobar_enter") {
> t[tid()]=gettimeofday_us()
> }
> probe kernel.trace("foobar_exit") {
> if (tid() in t) { s <<< gettimeofday_us() - t[tid()] }
> }
> probe timer.s(5),end {
> printf("cumulative average us: %d\n", @avg(s))
> }
> '
Is that done syncronously?
- Arnaldo
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