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// scheduler tapset
// Copyright (C) 2006 Intel Corporation.
// Copyright (C) 2005, 2006 IBM Corp.
// Copyright (C) 2010 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
@__private30 function __is_idle:long()
%{ /* pure */ /* stable */
/* Ways to detect idle-ness:
* - pid() or tid() == 0
* - current == current->parent
* - current == this_rq()->idle
* - others?
*/
STAP_RETVALUE = (current->pid == 0);
%}
/**
* probe scheduler.cpu_off - Process is about to stop running on a cpu
*
* @name: name of the probe point
* @task_prev: the process leaving the cpu (same as current)
* @task_next: the process replacing current
* @idle: boolean indicating whether current is the idle process
*
* Context: The process leaving the cpu.
*
*/
probe scheduler.cpu_off =
kernel.trace("sched_switch") !,
kernel.function("context_switch")
{
name = "cpu_off"
task_prev = $prev
task_next = $next
idle = __is_idle()
}
/**
* probe scheduler.cpu_on - Process is beginning execution on a cpu
*
* @name: name of the probe point
* @task_prev: the process that was previously running on this cpu
* @idle:- boolean indicating whether current is the idle process
*
* Context: The resuming process.
*/
probe scheduler.cpu_on = kernel.function("finish_task_switch") ?
{
name = "cpu_on"
task_prev = $prev
idle = __is_idle()
}
/**
* probe scheduler.tick - Schedulers internal tick, a processes timeslice accounting is updated
*
* @name: name of the probe point
* @idle: boolean indicating whether current is the idle process
*
* Context: The process whose accounting will be updated.
*/
probe scheduler.tick = kernel.function("scheduler_tick")
{
name = "tick"
idle = __is_idle()
}
/**
* probe scheduler.balance - A cpu attempting to find more work.
*
* @name: name of the probe point
*
* Context: The cpu looking for more work.
*/
probe scheduler.balance = kernel.function("idle_balance") ?
{
name = "balance"
}
/**
* probe scheduler.ctxswitch - A context switch is occuring.
*
* @name: name of the probe point
* @prev_pid: The PID of the process to be switched out
* @next_pid: The PID of the process to be switched in
* @prev_tid: The TID of the process to be switched out
* @next_tid: The TID of the process to be switched in
* @prev_task_name: The name of the process to be switched out
* @next_task_name: The name of the process to be switched in
* @prev_priority: The priority of the process to be switched out
* @next_priority: The priority of the process to be switched in
* @prevtsk_state: the state of the process to be switched out
* @nexttsk_state: the state of the process to be switched in
*/
/*
* We prefer the "sched_switch" tracepoint here, since we can reliably
* access the tracepoint's arguments. If we don't have the
* tracepoint, we try function probing. But these are typically
* inlined, and SystemTap can't access arguments of inline functions
* consistently. So we choose to probe __switch_to() instead of
* context_switch() on some platforms.
*
* Since the argument names for the tracepoint ("$prev" and "$next")
* match up with the function argument names, handling either the
* tracepoint or function here was made easier.
*/
probe scheduler.ctxswitch = kernel.trace("sched_switch") !,
%( arch != "x86_64" && arch != "ia64" && arch != "arm" && arch != "mips" %?
kernel.function("__switch_to")
%:
kernel.function("context_switch")
%)
{
name = "ctxswitch"
/*
* Note that we prefer '$prev_p' here because on RHEL5
* (2.6.18-238.1.1.el5) the '__switch_to()' function has both
* a '$prev_p' and a '$prev' argument. Since '$prev_p' is of
* the correct type (struct task_struct *), we need to look
* for it first.
*/
if (@defined($prev_p)) {
prev_priority = $prev_p->prio
prev_pid = $prev_p->tgid
prev_tid = $prev_p->pid
prev_task = $prev_p
prev_task_name = task_execname($prev_p)
prevtsk_state = task_state($prev_p)
}
else {
prev_priority = $prev->prio
prev_pid = $prev->tgid
prev_tid = $prev->pid
prev_task = $prev
prev_task_name = task_execname($prev)
prevtsk_state = task_state($prev)
}
if (@defined($next)) {
next_priority = $next->prio
next_pid = $next->tgid
next_tid = $next->pid
next_task = $next
next_task_name = task_execname($next)
nexttsk_state = task_state($next)
}
else if (@defined($next_p)) {
next_priority = $next_p->prio
next_pid = $next_p->tgid
next_tid = $next_p->pid
next_task = $next_p
next_task_name = task_execname($next_p)
nexttsk_state = task_state($next_p)
}
else {
next_priority = $new->prio
next_pid = $new->tgid
next_tid = $new->pid
next_task = $new
next_task_name = task_execname($new)
nexttsk_state = task_state($new)
}
}
/**
* probe scheduler.kthread_stop - A thread created by kthread_create is being stopped
* @thread_pid: PID of the thread being stopped
* @thread_priority: priority of the thread
*/
probe __scheduler.kthread_stop.kp = kernel.function("kthread_stop")
{
thread_pid = $k->tgid
thread_priority = $k->prio
}
probe __scheduler.kthread_stop.tp = kernel.trace("sched_kthread_stop")
{
thread_pid = $t->tgid
thread_priority = $t->prio
}
probe scheduler.kthread_stop =
__scheduler.kthread_stop.tp !,
__scheduler.kthread_stop.kp
{
name = "kthread_stop"
}
/**
* probe scheduler.kthread_stop.return - A kthread is stopped and gets the return value
* @name: name of the probe point
* @return_value: return value after stopping the thread
*/
probe __scheduler.kthread_stop.return.kp =
kernel.function("kthread_stop").return
{
return_value = @entry($k->exit_code)
}
probe __scheduler.kthread_stop.return.tp =
kernel.trace("sched_kthread_stop_ret")
{
return_value = $ret
}
probe scheduler.kthread_stop.return =
__scheduler.kthread_stop.return.tp !,
__scheduler.kthread_stop.return.kp
{
name = "kthread_stop"
}
/**
* probe scheduler.wait_task - Waiting on a task to unschedule (become inactive)
* @name: name of the probe point
* @task_pid: PID of the task the scheduler is waiting on
* @task_priority: priority of the task
*/
probe scheduler.wait_task =
kernel.trace("sched_wait_task") !,
kernel.function("wait_task_inactive") ?
{
name = "wait_task"
task_pid = $p->tgid
task_priority = $p->prio
}
/**
* probe scheduler.wakeup - Task is woken up
* @name: name of the probe point
* @task_pid: PID of the task being woken up
* @task_priority: priority of the task being woken up
* @task_cpu: cpu of the task being woken up
* @task_state: state of the task being woken up
* @task_tid: tid of the task being woken up
*/
probe scheduler.wakeup =
kernel.trace("sched_wakeup") !,
kernel.function("try_to_wake_up")
{
name = "wakeup"
task = $p
task_pid = $p->tgid
task_tid = $p->pid
task_priority = $p->prio
task_cpu = task_cpu($p)
task_state = task_state($p)
}
/**
* probe scheduler.wakeup_new - Newly created task is woken up for the first time
* @name: name of the probe point
* @task_pid: PID of the new task woken up
* @task_priority: priority of the new task
* @task_tid: TID of the new task woken up
* @task_state: state of the task woken up
* @task_cpu: cpu of the task woken up
*/
probe scheduler.wakeup_new =
kernel.trace("sched_wakeup_new") !,
kernel.function("wake_up_new_task")
{
name = "wakeup_new"
task_pid = $p->tgid
task_priority = $p->prio
task_cpu = task_cpu($p)
task_state = task_state($p)
task = $p
task_tid = $p->pid
}
/**
* probe scheduler.migrate - Task migrating across cpus
* @name: name of the probe point
* @task: the process that is being migrated
* @pid: PID of the task being migrated
* @priority: priority of the task being migrated
* @cpu_from: the original cpu
* @cpu_to: the destination cpu
*/
probe __scheduler.migrate.kp =
kernel.function("set_task_cpu") !,
kernel.function("pull_task") ?
{
cpu_to = @choose_defined($new_cpu,
@choose_defined($cpu, $this_cpu))
}
probe __scheduler.migrate.tp = kernel.trace("sched_migrate_task")
{
cpu_to = $dest_cpu
}
probe scheduler.migrate =
__scheduler.migrate.tp !,
__scheduler.migrate.kp ?
{
name = "migrate"
task = $p
pid = $p->tgid
priority = $p->prio
cpu_from = task_cpu($p)
}
function container_of_task_rcu:long(rcu_ptr:long)
{
if (@defined(&@task(0)->rcu)) {
/* Like @container_of, but taking care not to wrap */
offset = & @task(0)->rcu
if (rcu_ptr > offset)
return &@task(rcu_ptr - offset)
}
return 0
}
/**
* probe scheduler.process_free - Scheduler freeing a data structure for a process
* @name: name of the probe point
* @pid: PID of the process getting freed
* @priority: priority of the process getting freed
*/
probe __scheduler.process_free.kp =
kernel.function("delayed_put_task_struct") !,
kernel.function("__put_task_struct")
{
if (@defined($rhp)) {
__tsk = container_of_task_rcu($rhp)
pid = __tsk->tgid
priority = __tsk->prio
}
else {
pid = $tsk->tgid
priority = $tsk->prio
}
}
probe __scheduler.process_free.tp = kernel.trace("sched_process_free")
{
pid = $p->tgid
priority = $p->prio
}
probe scheduler.process_free =
__scheduler.process_free.tp !,
__scheduler.process_free.kp
{
name = "process_free"
}
/**
* probe scheduler.process_exit - Process exiting
* @name: name of the probe point
* @pid: PID of the process exiting
* @priority: priority of the process exiting
*/
probe __scheduler.process_exit.kp = kernel.function("do_exit")
{
if (@defined($tsk)) {
__tsk = $tsk
pid = $tsk->tgid
priority = $tsk->prio
}
else {
__tsk = task_current()
pid = __tsk->tgid
priority = __tsk->prio
}
}
probe __scheduler.process_exit.tp = kernel.trace("sched_process_exit")
{
pid = $p->tgid
priority = $p->prio
}
probe scheduler.process_exit =
__scheduler.process_exit.tp !,
__scheduler.process_exit.kp
{
name = "process_exit"
}
/**
* probe scheduler.process_wait - Scheduler starting to wait on a process
* @name: name of the probe point
* @pid: PID of the process scheduler is waiting on
*/
probe __scheduler.process_wait.kp = kernel.function("do_wait")
{
if (@defined($wo)) {
pid = $wo->wo_pid
}
else {
pid = $pid
}
}
probe __scheduler.process_wait.tp = kernel.trace("sched_process_wait")
{
pid = $pid
}
probe scheduler.process_wait =
__scheduler.process_wait.tp !,
__scheduler.process_wait.kp
{
name = "process_wait"
}
/**
* probe scheduler.process_fork - Process forked
* @name: name of the probe point
* @parent_pid: PID of the parent process
* @child_pid: PID of the child process
*/
probe __scheduler.process_fork.kp =
kernel.function("_do_fork").return !,
kernel.function("do_fork").return
{
parent_pid = task_current()->tgid
child_pid = $return
}
probe __scheduler.process_fork.tp = kernel.trace("sched_process_fork")
{
parent_pid = $parent->tgid
child_pid = $child->tgid
}
probe scheduler.process_fork =
__scheduler.process_fork.tp !,
__scheduler.process_fork.kp
{
name = "process_fork"
}
/**
* probe scheduler.signal_send - Sending a signal
* @name: name of the probe point
* @pid: pid of the process sending signal
* @signal_number: signal number
*/
probe __scheduler.signal_send.kp =
kernel.function("__send_signal") !,
kernel.function("send_signal")
{
pid = $t->tgid
}
probe __scheduler.signal_send.tp = kernel.trace("sched_signal_send")
{
pid = $p->tgid
}
probe scheduler.signal_send =
__scheduler.signal_send.tp !,
__scheduler.signal_send.kp
{
name = "signal_send"
signal_number = $sig
}