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    Subject[PATCH 3/6] trace: Add tracepoints to IRQ work run handler
    Date
    This is a part of overall effort to trace all the interrupts happening
    in a system to figure out what time is spent in kernel space versus user
    space.

    Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
    ---
    include/trace/events/irq.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
    kernel/irq_work.c | 4 ++++
    2 files changed, 48 insertions(+), 0 deletions(-)

    diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
    index e6e72e0..d8fab89 100644
    --- a/include/trace/events/irq.h
    +++ b/include/trace/events/irq.h
    @@ -295,6 +295,50 @@ DEFINE_EVENT(timer_interrupt, timer_nohz_exit,
    TP_ARGS(ignore)
    );

    +DECLARE_EVENT_CLASS(irq_work,
    +
    + TP_PROTO(unsigned int ignore),
    +
    + TP_ARGS(ignore),
    +
    + TP_STRUCT__entry(
    + __field( unsigned int, ignore )
    + ),
    +
    + TP_fast_assign(
    + __entry->ignore = ignore;
    + ),
    +
    + TP_printk("%u", __entry->ignore)
    +);
    +
    +/**
    + * irq_work_run_entry - called immediately after entering the irq work
    + * handler
    + *
    + * When used in combination with the irq_work_run_exit tracepoint
    + * we can determine the irq work handler runtime.
    + */
    +DEFINE_EVENT(irq_work, irq_work_run_entry,
    +
    + TP_PROTO(unsigned int ignore),
    +
    + TP_ARGS(ignore)
    +);
    +
    +/**
    + * irq_work_run_exit - called just before the irq work handler returns
    + *
    + * When used in combination with the irq_work_run_entry tracepoint
    + * we can determine the irq work handler runtime.
    + */
    +DEFINE_EVENT(irq_work, irq_work_run_exit,
    +
    + TP_PROTO(unsigned int ignore),
    +
    + TP_ARGS(ignore)
    +);
    +
    #endif /* _TRACE_IRQ_H */

    /* This part must be outside protection */
    diff --git a/kernel/irq_work.c b/kernel/irq_work.c
    index c58fa7d..7e78122 100644
    --- a/kernel/irq_work.c
    +++ b/kernel/irq_work.c
    @@ -9,6 +9,7 @@
    #include <linux/module.h>
    #include <linux/irq_work.h>
    #include <linux/hardirq.h>
    +#include <trace/events/irq.h>

    /*
    * An entry can be in one of four states:
    @@ -125,6 +126,8 @@ void irq_work_run(void)
    if (this_cpu_read(irq_work_list) == NULL)
    return;

    + trace_irq_work_run_entry(0);
    +
    BUG_ON(!in_irq());
    BUG_ON(!irqs_disabled());

    @@ -149,6 +152,7 @@ void irq_work_run(void)
    next_flags(NULL, IRQ_WORK_BUSY),
    NULL);
    }
    + trace_irq_work_run_exit(0);
    }
    EXPORT_SYMBOL_GPL(irq_work_run);

    --
    1.7.3.1


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