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    SubjectRe: [PATCH 3/6] trace: Add tracepoints to IRQ work run handler
    On Thu, Jul 14, 2011 at 02:38:12PM -0700, Vaibhav Nagarnaik wrote:
    > 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;

    If you don't want to miss any of these interrupts, I suggest you
    call trace_irq_work_run_entry(0) before the above check.

    Also I'm adding Peter who maintains this.

    >
    > + 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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