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Viewing changes to include/trace/events/irq.h

  • Committer: Bazaar Package Importer
  • Author(s): Luke Yelavich
  • Date: 2009-08-05 23:00:52 UTC
  • Revision ID: james.westby@ubuntu.com-20090805230052-7xedvqcyk9dnnxb2
Tags: 2.6.31-1.1
New upstream release

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include/trace/events/irq.h
 
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#undef TRACE_SYSTEM
 
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#define TRACE_SYSTEM irq
 
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#if !defined(_TRACE_IRQ_H) || defined(TRACE_HEADER_MULTI_READ)
 
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#define _TRACE_IRQ_H
 
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#include <linux/tracepoint.h>
 
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#include <linux/interrupt.h>
 
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#define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
 
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#define show_softirq_name(val)                  \
 
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        __print_symbolic(val,                   \
 
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                         softirq_name(HI),      \
 
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                         softirq_name(TIMER),   \
 
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                         softirq_name(NET_TX),  \
 
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                         softirq_name(NET_RX),  \
 
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                         softirq_name(BLOCK),   \
 
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                         softirq_name(TASKLET), \
 
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                         softirq_name(SCHED),   \
 
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                         softirq_name(HRTIMER), \
 
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                         softirq_name(RCU))
 
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/**
 
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 * irq_handler_entry - called immediately before the irq action handler
 
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 * @irq: irq number
 
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 * @action: pointer to struct irqaction
 
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 *
 
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 * The struct irqaction pointed to by @action contains various
 
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 * information about the handler, including the device name,
 
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 * @action->name, and the device id, @action->dev_id. When used in
 
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 * conjunction with the irq_handler_exit tracepoint, we can figure
 
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 * out irq handler latencies.
 
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 */
 
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TRACE_EVENT(irq_handler_entry,
 
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        TP_PROTO(int irq, struct irqaction *action),
 
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        TP_ARGS(irq, action),
 
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        TP_STRUCT__entry(
 
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                __field(        int,    irq             )
 
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                __string(       name,   action->name    )
 
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        ),
 
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        TP_fast_assign(
 
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                __entry->irq = irq;
 
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                __assign_str(name, action->name);
 
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        ),
 
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        TP_printk("irq=%d handler=%s", __entry->irq, __get_str(name))
 
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);
 
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/**
 
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 * irq_handler_exit - called immediately after the irq action handler returns
 
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 * @irq: irq number
 
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 * @action: pointer to struct irqaction
 
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 * @ret: return value
 
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 *
 
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 * If the @ret value is set to IRQ_HANDLED, then we know that the corresponding
 
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 * @action->handler scuccessully handled this irq. Otherwise, the irq might be
 
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 * a shared irq line, or the irq was not handled successfully. Can be used in
 
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 * conjunction with the irq_handler_entry to understand irq handler latencies.
 
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 */
 
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TRACE_EVENT(irq_handler_exit,
 
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        TP_PROTO(int irq, struct irqaction *action, int ret),
 
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        TP_ARGS(irq, action, ret),
 
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        TP_STRUCT__entry(
 
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                __field(        int,    irq     )
 
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                __field(        int,    ret     )
 
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        ),
 
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        TP_fast_assign(
 
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                __entry->irq    = irq;
 
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                __entry->ret    = ret;
 
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        ),
 
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        TP_printk("irq=%d return=%s",
 
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                  __entry->irq, __entry->ret ? "handled" : "unhandled")
 
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);
 
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/**
 
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 * softirq_entry - called immediately before the softirq handler
 
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 * @h: pointer to struct softirq_action
 
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 * @vec: pointer to first struct softirq_action in softirq_vec array
 
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 *
 
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 * The @h parameter, contains a pointer to the struct softirq_action
 
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 * which has a pointer to the action handler that is called. By subtracting
 
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 * the @vec pointer from the @h pointer, we can determine the softirq
 
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 * number. Also, when used in combination with the softirq_exit tracepoint
 
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 * we can determine the softirq latency.
 
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 */
 
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TRACE_EVENT(softirq_entry,
 
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        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
 
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        TP_ARGS(h, vec),
 
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        TP_STRUCT__entry(
 
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                __field(        int,    vec                     )
 
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        ),
 
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        TP_fast_assign(
 
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                __entry->vec = (int)(h - vec);
 
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        ),
 
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        TP_printk("softirq=%d action=%s", __entry->vec,
 
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                  show_softirq_name(__entry->vec))
 
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);
 
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/**
 
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 * softirq_exit - called immediately after the softirq handler returns
 
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 * @h: pointer to struct softirq_action
 
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 * @vec: pointer to first struct softirq_action in softirq_vec array
 
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 *
 
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 * The @h parameter contains a pointer to the struct softirq_action
 
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 * that has handled the softirq. By subtracting the @vec pointer from
 
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 * the @h pointer, we can determine the softirq number. Also, when used in
 
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 * combination with the softirq_entry tracepoint we can determine the softirq
 
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 * latency.
 
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 */
 
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TRACE_EVENT(softirq_exit,
 
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        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
 
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        TP_ARGS(h, vec),
 
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        TP_STRUCT__entry(
 
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                __field(        int,    vec                     )
 
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        ),
 
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        TP_fast_assign(
 
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                __entry->vec = (int)(h - vec);
 
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        ),
 
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        TP_printk("softirq=%d action=%s", __entry->vec,
 
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                  show_softirq_name(__entry->vec))
 
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);
 
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#endif /*  _TRACE_IRQ_H */
 
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/* This part must be outside protection */
 
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#include <trace/define_trace.h>