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#!/usr/bin/env stap
# This is an example of profiling a specific command or pid.
# It works by recording the time when a system call is entered
# exited.
# Usage: prof.stp -c "top -n5"
# Will start up "top" and after 5 iterations, will exit.
#
# Usage: prof.stp -x 3323
# Will profile pid 3323 until it ^c is hit.
#
probe kernel.function("sys_*").call {
if (target() == tid())
calltime[tid()] = gettimeofday_us()
}
probe kernel.function("sys_*").return {
if (target() != tid()) next
now = gettimeofday_us()
c = calltime[tid()]
if (!c) next
ttime[probefunc()] <<< now - c
delete calltime[tid()]
}
probe end {
printf("\n")
foreach (x in ttime)
printf("%-20s\tcalls:%6d\tavg time (us):%5d\ttotal(us):%7d\n",
x, @count(ttime[x]), @avg(ttime[x]), @sum(ttime[x]))
}
global calltime, ttime
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