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// scheduler tapset
// Copyright (C) 2006 Intel Corporation.
// Copyright (C) 2005, 2006 IBM Corp.
//
// 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.
function __is_idle:long()
%{ /* pure */
/* Ways to detect idle-ness:
* - pid() or tid() == 0
* - current == current->parent
* - current == this_rq()->idle
* - others?
*/
THIS->__retvalue = (current->pid == 0);
%}
/* probe scheduler.cpu_off
*
* Fires when a process is about to stop running on a cpu.
*
* Context:
* The process leaving the cpu.
*
* Arguments:
* 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
*/
probe scheduler.cpu_off
= kernel.inline("context_switch")
{
task_prev = $prev
task_next = $next
idle = __is_idle()
}
/* probe scheduler.cpu_on
*
* Fires when a process is beginning execution on a cpu.
*
* Context:
* The resuming process.
*
* Arguments:
* task_prev - the process that was previously running on this cpu.
* idle - boolean indicating whether current is the idle process
*/
probe scheduler.cpu_on
= kernel.inline("finish_task_switch")
{
task_prev = $prev
idle = __is_idle()
}
/* probe scheduler.tick
*
* Fires on the schedulers internal tick, when a processes timeslice
* accounting is updated.
*
* Context:
* The process whose accounting will be updated.
*
* Arguments:
* idle - boolean indicating whether current is the idle process
*/
probe scheduler.tick = kernel.function("scheduler_tick")
{
idle = __is_idle()
}
/* probe scheduler.migrate
*
* Fires whenever a task is moved to a different cpu's runqueue.
*
* Context:
* Unknown (sometimes migration thread, sometimes cpu_to)
*
* Arguments:
* task - the process that is being migrated
* cpu_from - the cpu that is losing the task
* cpu_to - the cpu that is claiming the task
*/
probe scheduler.migrate = kernel.inline("pull_task") {
task = $p
cpu_from = $p->thread_info->cpu
cpu_to = $this_cpu
}
/* probe scheduler.balance
*
* Fires when a cpu attempts to find more work.
* Only applicable to SMP systems
*
* Context:
* The cpu looking for more work.
*/
probe scheduler.balance = kernel.inline("idle_balance")? {}
/* probe scheduler.ctxswitch
*
* Fires when there is a context switch
* Currently systemTap can't access arguments of inline
* functions. So we choose to probe __switch_to instead
* of context_switch()
* Arguments:
* prev_pid: The pid of the process to be switched out
* next_pid: The pid of the process to be switched in
* prevtsk_state: the state of the process to be switched out
*/
probe scheduler.ctxswitch
= kernel.function("__switch_to")
{
%( arch == "ppc64" %?
prev_pid = $prev->pid
next_pid = $new->pid
prev_task = $prev
next_task = $new
prevtsk_state = $prev->state
%:
prev_pid = $prev_p->pid
next_pid = $next_p->pid
prev_task = $prev_p
next_task = $next_p
prevtsk_state = $prev_p->state
%)
}
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