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#! /usr/bin/env stap
############################################################
# Schedtimes.stp
#
# Copyright (C) 2009, 2014 Red Hat, Inc.
#
# This program is free software you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
# Authors: Jason Baron <jbaron@redhat.com>
# Josh Stone <jistone@redhat.com>
# profiles threads and displays their run times, queued times,
# wait times, including i/o wait times.
# Has two modes. When no arguments are given it profiles all
# threads. Alternatively, you can pass -c "program name"
############################################################
//constants
global DEAD=-1, RUNNING=1, QUEUED=2, SLEEPING=3
global run_time, queued_time, sleep_time, iowait_time
global pid_state, pid_names
// For new enough kernels, roughly 2.6.32+, the @defined(@task->in_iowait)
// tests will succeed and reduce these macros to nothing, including these
// pid-iowait arrays. For older kernels, the rq fallback will remain.
global pid_in_iowait
global pid_iowait_count
@define in_iowait(task) %(
@choose_defined(@task->in_iowait,
(pid_in_iowait[@task->pid] ? pid_in_iowait[@task->pid]-- : 0))
%)
@define clear_iowait(rq, task) %(
if (!@defined(@task->in_iowait))
pid_iowait_count[@task->pid] = @nr_iowait(@rq)
%)
@define set_iowait(rq, task) %(
if (!@defined(@task->in_iowait))
pid_in_iowait[@task->pid] = (@nr_iowait(@rq) > pid_iowait_count[@task->pid])
%)
@define nr_iowait(rq) %(
atomic_read(&@cast(@rq, "rq")->nr_iowait)
%)
global previous_timestamp
function timestamp()
{
return cpu_clock_us(0)
}
function update_times(pid, now)
{
delta = now - previous_timestamp[pid]
previous_timestamp[pid] = now
if ((state = pid_state[pid]) > 0) {
if (state == SLEEPING)
sleep_time[pid] += delta
else if (state == QUEUED)
queued_time[pid] += delta
else if (state == RUNNING)
run_time[pid] += delta
}
return delta
}
function task_targeted(task)
{
pid = task_pid(task)
if (pid && (!target() || target_set_pid(pid))) {
pid_names[task_tid(task)] = task_execname(task)
return 1
}
return 0
}
// Update the task name after exec
probe kernel.trace("sched_process_exec")!,
kprocess.exec_complete
{
if (tid() in pid_names)
pid_names[tid()] = execname()
}
probe kernel.trace("sched_switch")
{
// Task $prev is scheduled off this cpu
if (task_targeted($prev)) {
pid = $prev->pid
state = $prev->state
update_times(pid, timestamp())
if (state > 0) {
@set_iowait($rq, $prev)
pid_state[pid] = SLEEPING
} else if (state == 0) {
pid_state[pid] = QUEUED
} else {
pid_state[pid] = DEAD
}
}
// Task $next is scheduled onto this cpu
if (task_targeted($next)) {
pid = $next->pid
update_times(pid, timestamp())
@clear_iowait($rq, $next)
pid_state[pid] = RUNNING
}
}
probe kernel.trace("sched_wakeup")
{
// Task $p is awakened
if (@choose_defined($success, 1) && task_targeted($p)) {
pid = $p->pid
delta = update_times(pid, timestamp())
if (pid_state[pid] == SLEEPING && @in_iowait($p)) {
iowait_time[pid] += delta
}
pid_state[pid] = QUEUED
}
}
// Give task $p a final accounting
probe kernel.trace("sched_process_exit")
{
if (task_targeted($p)) {
pid = $p->pid
update_times(pid, timestamp())
pid_state[pid] = DEAD
}
}
probe end
{
t = timestamp()
printf ("\n%16s: %6s %10s %10s %10s %10s %10s\n\n",
"execname", "pid", "run(us)", "sleep(us)", "iowait(us)",
"queued(us)", "total(us)")
foreach (pid+ in pid_state) {
update_times(pid, t)
printf("%16s: %6d %10d %10d %10d %10d %10d\n", pid_names[pid], pid,
run_time[pid], sleep_time[pid], iowait_time[pid], queued_time[pid],
(run_time[pid] + sleep_time[pid] + queued_time[pid]))
}
}
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