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    Subject[PATCH RFC tip/core/rcu 1/4] rcu: Add RCU_FAST_NO_HZ tracing for idle exit
    Date
    From: "Paul E. McKenney" <paul.mckenney@linaro.org>

    Traces of rcu_prep_idle events can be confusing because
    rcu_cleanup_after_idle() does no tracing. This commit therefore adds
    this tracing.

    Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    include/trace/events/rcu.h | 1 +
    kernel/rcutree_plugin.h | 1 +
    2 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
    index 3370997..aaa55e1 100644
    --- a/include/trace/events/rcu.h
    +++ b/include/trace/events/rcu.h
    @@ -292,6 +292,7 @@ TRACE_EVENT(rcu_dyntick,
    * "More callbacks": Still more callbacks, try again to clear them out.
    * "Callbacks drained": All callbacks processed, off to dyntick idle!
    * "Timer": Timer fired to cause CPU to continue processing callbacks.
    + * "Cleanup after idle": Idle exited, timer canceled.
    */
    TRACE_EVENT(rcu_prep_idle,

    diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
    index c023464..1e561ab 100644
    --- a/kernel/rcutree_plugin.h
    +++ b/kernel/rcutree_plugin.h
    @@ -2085,6 +2085,7 @@ static void rcu_prepare_for_idle_init(int cpu)
    static void rcu_cleanup_after_idle(int cpu)
    {
    hrtimer_cancel(&per_cpu(rcu_idle_gp_timer, cpu));
    + trace_rcu_prep_idle("Cleanup after idle");
    }

    /*
    --
    1.7.8


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