#!/usr/bin/stap
function time () { return gettimeofday_ms() }
global time_name = "ms"
global boredom = 10 # in time units
global name, back, backtime, bored
/* Note: the order that the probes are listed should not matter.
However, the following order for
probe kernel.function("wait_for_completion").return and
probe kernel.function("wait_for_completion").call
avoids have the kretprobe stuff in the backtrace.
for more information see:
http://sourceware.org/bugzilla/show_bug.cgi?id=6436
*/
probe kernel.function("wait_for_completion").return
{
if ([tid()] in bored) {
patience = time() - backtime[tid()]
printf ("thread %d (%s) bored for %d %s\n",
tid(), name[tid()], patience, time_name)
}
delete bored[tid()]
delete back[tid()]
delete name[tid()]
delete backtime[tid()]
}
probe kernel.function("wait_for_completion").call
{
back[tid()]=backtrace()
name[tid()]=execname()
backtime[tid()]=time()
delete bored[tid()]
}
probe timer.profile {
foreach (tid+ in back) {
if ([tid] in bored) continue
patience = time() - backtime[tid]
if (patience >= boredom) {
printf ("thread %d (%s) impatient after %d %s\n",
tid, name[tid], patience, time_name)
print_syms (back[tid])
printf ("\n")
bored[tid] = 1 # defer further reports to wakeup
}
}
}
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