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    Subject[RFC][PATCH 06/11] sched: add the sched-debug bits for sched_dl.
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    Date
    Add the typical debugging output provided by sched_deug (if enabled)
    also to the sched_dl class.

    Signed-off-by: Dario Faggioli <raistlin@linux.it>
    ---
    kernel/sched_debug.c | 33 +++++++++++++++++++++++++++++++++
    kernel/sched_dl.c | 26 ++++++++++++++++++++++++++
    2 files changed, 59 insertions(+), 0 deletions(-)

    diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
    index 67f95aa..407a761 100644
    --- a/kernel/sched_debug.c
    +++ b/kernel/sched_debug.c
    @@ -246,6 +246,38 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
    #undef P
    }

    +void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
    +{
    + s64 min_deadline = -1, max_deadline = -1;
    + struct rq *rq = &per_cpu(runqueues, cpu);
    + struct sched_dl_entity *last;
    + unsigned long flags;
    +
    + SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
    +
    + raw_spin_lock_irqsave(&rq->lock, flags);
    + if (dl_rq->rb_leftmost)
    + min_deadline = (rb_entry(dl_rq->rb_leftmost,
    + struct sched_dl_entity,
    + rb_node))->deadline;
    + last = __pick_dl_last_entity(dl_rq);
    + if (last)
    + max_deadline = last->deadline;
    + raw_spin_unlock_irqrestore(&rq->lock, flags);
    +
    +#define P(x) \
    + SEQ_printf(m, " .%-30s: %Ld\n", #x, (long long)(x))
    +#define PN(x) \
    + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(x))
    +
    + P(dl_rq->dl_nr_running);
    + PN(min_deadline);
    + PN(max_deadline);
    +
    +#undef PN
    +#undef P
    +}
    +
    static void print_cpu(struct seq_file *m, int cpu)
    {
    struct rq *rq = cpu_rq(cpu);
    @@ -305,6 +337,7 @@ static void print_cpu(struct seq_file *m, int cpu)
    #endif
    print_cfs_stats(m, cpu);
    print_rt_stats(m, cpu);
    + print_dl_stats(m, cpu);

    print_rq(m, rq, cpu);
    }
    diff --git a/kernel/sched_dl.c b/kernel/sched_dl.c
    index a1202ac..dee2668 100644
    --- a/kernel/sched_dl.c
    +++ b/kernel/sched_dl.c
    @@ -44,6 +44,9 @@ static inline int dl_time_before(u64 a, u64 b)
    return (s64)(a - b) < 0;
    }

    +#define for_each_leaf_dl_rq(dl_rq, rq) \
    + for (dl_rq = &rq->dl; dl_rq; dl_rq = NULL)
    +
    static void enqueue_dl_entity(struct sched_dl_entity *dl_se);
    static void dequeue_dl_entity(struct sched_dl_entity *dl_se);
    static void check_dl_preempt_curr(struct task_struct *p, struct rq *rq);
    @@ -512,6 +515,16 @@ static void start_hrtick_dl(struct rq *rq, struct task_struct *p)
    }
    #endif

    +static struct sched_dl_entity *__pick_dl_last_entity(struct dl_rq *dl_rq)
    +{
    + struct rb_node *last = rb_last(&dl_rq->rb_root);
    +
    + if (!last)
    + return NULL;
    +
    + return rb_entry(last, struct sched_dl_entity, rb_node);
    +}
    +
    static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
    struct dl_rq *dl_rq)
    {
    @@ -676,3 +689,16 @@ static const struct sched_class dl_sched_class = {
    .switched_to = switched_to_dl,
    };

    +#ifdef CONFIG_SCHED_DEBUG
    +extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
    +
    +static void print_dl_stats(struct seq_file *m, int cpu)
    +{
    + struct dl_rq *dl_rq = &cpu_rq(cpu)->dl;
    +
    + rcu_read_lock();
    + for_each_leaf_dl_rq(dl_rq, cpu_rq(cpu))
    + print_dl_rq(m, cpu, dl_rq);
    + rcu_read_unlock();
    +}
    +#endif /* CONFIG_SCHED_DEBUG */
    --
    1.7.0
    --
    <<This happens because I choose it to happen!>> (Raistlin Majere)
    ----------------------------------------------------------------------
    Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa (Italy)
    http://blog.linux.it/raistlin / raistlin@ekiga.net /
    dario.faggioli@jabber.org
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