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#! /usr/bin/env 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://sources.redhat.com/bugzilla/show_bug.cgi?id=6436
*/
probe kernel.function("wait_for_completion").return
{
t=tid()
if ([t] in bored) {
patience = time() - backtime[t]
printf ("thread %d (%s) bored for %d %s\n",
t, name[t], patience, time_name)
}
delete bored[t]
delete back[t]
delete name[t]
delete backtime[t]
}
probe kernel.function("wait_for_completion").call
{
t=tid()
back[t]=backtrace()
name[t]=execname()
backtime[t]=time()
delete bored[t]
}
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_stack (back[tid])
printf ("\n")
bored[tid] = 1 # defer further reports to wakeup
}
}
}
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