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/*
* Copyright (C) 2009 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.
*
* Version 1.0 prerna@linux.vnet.ibm.com 2009-10-28
*
* Tracepoint based tapset for IRQs, Workqueues, etc
*
*/
// Probes for workqueues.
/**
* probe workqueue.create : probes creation of a new workqueue
* @wq_thread : task_struct of the workqueue thread.
* @cpu : cpu for which the worker thread is created.
*/
probe workqueue.create = kernel.trace("workqueue_creation") ?
{
wq_thread = $wq_thread
cpu = $cpu
}
/**
* probe workqueue.insert : probes queuing of work on a workqueue
* @wq_thread : task_struct of the workqueue thread.
* @work : work_struct* being queued.
* @work_func : pointer to handler func.
*/
probe workqueue.insert = kernel.trace("workqueue_insertion") ?
{
wq_thread = $wq_thread
work = $work
work_func = $work->func
}
/**
* probe workqueue.execute : probes execution of deferred work.
* @wq_thread : task_struct of the workqueue thread.
* @work : work_struct* being executed.
* @work_func : pointer to handler func.
*/
probe workqueue.execute = kernel.trace("workqueue_execution") ?
{
wq_thread = $wq_thread
work = $work
work_func = $work->func
}
/**
* probe workqueue.destroy : probes destruction of each worker thread of each cpu for a workqueue.
* @wq_thread : task_struct of the workqueue thread.
*/
probe workqueue.destroy = kernel.trace("workqueue_destruction") ?
{
wq_thread = $wq_thread
}
// Probes for IRQ handlers.
/**
* probe irq_handler.entry : Fires prior to execution of interrupt handler.
* @irq : irq number.
* @action : struct irqaction* for this interrupt num.
* @handler : interrupt handler function.
* @flags : Flags for IRQ handler
* IRQF_DISABLED [0x00000020] : keep irqs disabled when calling action handler.
* IRQF_SAMPLE_RANDOM [0x00000040] : irq is used to feed the random generator
* IRQF_SHARED [0x00000080] : allow sharing the irq among several devices
* IRQF_PROBE_SHARED [0x00000100] : set by callers when they expect sharing mismatches to occur
* IRQF_TIMER [0x00000200] : Flag to mark this interrupt as timer interrupt
* IRQF_PERCPU [0x00000400] : Interrupt is per cpu.
* IRQF_NOBALANCING [0x00000800] : Flag to exclude this interrupt from irq balancing
* IRQF_IRQPOLL [0x00001000] : Interrupt is used for polling.
* IRQF_ONESHOT [0x00002000] : Interrupt is not reenabled after the hardirq handler finished.
* @flags_str : symbolic string representation of IRQ flags.
* @dev_name : name of device.
* @dev_id : Cookie to identify device.
* @next_irqaction : pointer to next irqaction for shared interrupts.
* @dir : pointer to the proc/irq/NN/name entry
* @thread_fn : interupt handler function for threaded interrupts.
* @thread : thread pointer for threaded interrupts.
* @thread_flags : Flags related to thread.
*/
probe irq_handler.entry = kernel.trace("irq_handler_entry") ?
{
irq = $irq
action = $action
handler = $action->handler
flags = $action->flags
flags_str = irqflags_str(flags)
dev_name = $action->name
dev_id = $action->dev_id
next_irqaction = $action->next
dir = $action->dir
thread_fn = $action->thread_fn
thread = $action->thread
thread_flags = $action->thread_flags
}
/**
* probe irq_handler.exit : Fires just after execution of interrupt handler.
* @irq : interrupt number
* @action : struct irqaction*
* @ret : return value of the handler
* @handler : interrupt handler function that was executed.
* @flags : flags for IRQ handler
* IRQF_DISABLED [0x00000020] : keep irqs disabled when calling action handler.
* IRQF_SAMPLE_RANDOM [0x00000040] : irq is used to feed the random generator
* IRQF_SHARED [0x00000080] : allow sharing the irq among several devices
* IRQF_PROBE_SHARED [0x00000100] : set by callers when they expect sharing mismatches to occur
* IRQF_TIMER [0x00000200] : Flag to mark this interrupt as timer interrupt
* IRQF_PERCPU [0x00000400] : Interrupt is per cpu.
* IRQF_NOBALANCING [0x00000800] : Flag to exclude this interrupt from irq balancing
* IRQF_IRQPOLL [0x00001000] : Interrupt is used for polling.
* IRQF_ONESHOT [0x00002000] : Interrupt is not reenabled after the hardirq handler finished.
* @flags_str : symbolic string representation of IRQ flags.
* @dev_name : name of device.
* @dev_id : Cookie to identify device.
* @next_irqaction : pointer to next irqaction for shared interrupts.
* @dir : pointer to the proc/irq/NN/name entry
* @thread_fn : interupt handler function for threaded interrupts.
* @thread : thread pointer for threaded interrupts.
* @thread_flags : Flags related to thread.
*/
probe irq_handler.exit = kernel.trace("irq_handler_exit") ?
{
irq = $irq
action = $action
ret = $ret
handler = $action->handler
flags = $action->flags
flags_str = irqflags_str(flags)
dev_name = $action->name
dev_id = $action->dev_id
next_irqaction = $action->next
dir = $action->dir
thread_fn = $action->thread_fn
thread = $action->thread
thread_flags = $action->thread_flags
}
// Softirq based probes.
/**
* probe softirq.entry : triggered just before executing handler
* for a pending softirq.
* @h : struct softirq_action* for current pending softirq.
* @vec : softirq_action vector.
* @action : pointer to softirq handler just about to execute.
*/
probe softirq.entry = kernel.trace("softirq_entry") ?
{
h = $h
vec = $vec
action = $h->action
}
/**
* probe softirq.exit : triggered just after executing handler for a pending
* softirq.
* @h : struct softirq_action* for just executed softirq.
* @vec : softirq_action vector.
* @action : pointer to softirq handler that just finished execution.
*/
probe softirq.exit = kernel.trace("softirq_exit") ?
{
h = $h
vec = $vec
action = $h->action
}
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