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))
}
'
- FChE
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