#!/usr/bin/stap
# alias_suffixes.stp
# Uses alias suffixes to track time intervals for a subset of kernel
# functions. Based on func_time_stats.stp.
global start, intervals
# We can apply a suffix to multiple probe points designated by one alias:
probe miscellany = syscall.open, syscall.close, syscall.read, syscall.write { }
probe miscellany {
start[name, tid()] = gettimeofday_us()
}
# The 'return' suffix is passed on to each of the underlying probe points:
probe miscellany.return {
t = gettimeofday_us(); old_t = start[name, tid()]
if (old_t) intervals[name] <<< t - old_t
delete start[name, tid()]
}
probe begin {
printf("Collecting data... press Ctrl-C to stop.\n")
}
probe end {
foreach (name in intervals) {
printf("intervals for %s -- min:%dus avg:%dus max:%dus count:%d\n",
name, @min(intervals[name]), @avg(intervals[name]),
@max(intervals[name]), @count(intervals[name]))
print(@hist_log(intervals[name]))
}
}
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