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    SubjectRe: [RFC 0/12][PATCH] SCHED_DEADLINE: added sched-debug support.
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    Date
    This commit adds the debugging output support for the SCHED_DEADLINE runqueue.

    Signed-off-by: Raistlin <raistlin@linux.it>
    ---
    include/linux/sched.h | 6 ++++++
    kernel/sched_deadline.c | 21 +++++++++++++++++++++
    kernel/sched_debug.c | 33 +++++++++++++++++++++++++++++++++
    3 files changed, 60 insertions(+), 0 deletions(-)

    diff --git a/include/linux/sched.h b/include/linux/sched.h
    index 20e1a6a..fac928a 100644
    --- a/include/linux/sched.h
    +++ b/include/linux/sched.h
    @@ -167,6 +167,8 @@ extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
    extern void proc_sched_set_task(struct task_struct *p);
    extern void
    print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
    +extern void
    +print_deadline_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
    #else
    static inline void
    proc_sched_show_task(struct task_struct *p, struct seq_file *m)
    @@ -179,6 +181,10 @@ static inline void
    print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
    {
    }
    +static inline void
    +print_deadline_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
    +{
    +}
    #endif

    extern unsigned long long time_sync_thresh;
    diff --git a/kernel/sched_deadline.c b/kernel/sched_deadline.c
    index b4be178..f2c1b6e 100644
    --- a/kernel/sched_deadline.c
    +++ b/kernel/sched_deadline.c
    @@ -400,6 +400,16 @@ static void start_hrtick_deadline(struct rq *rq, struct task_struct *p)
    }
    #endif

    +static struct sched_dl_entity *__pick_deadline_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_deadline_entity(struct rq *rq,
    struct dl_rq *dl_rq)
    {
    @@ -531,3 +541,14 @@ static const struct sched_class deadline_sched_class = {
    .switched_to = switched_to_deadline,
    };

    +#ifdef CONFIG_SCHED_DEBUG
    +static void print_deadline_stats(struct seq_file *m, int cpu)
    +{
    + struct dl_rq *dl_rq = &cpu_rq(cpu)->dl;
    +
    + rcu_read_lock();
    + for_each_leaf_deadline_rq(dl_rq, cpu_rq(cpu))
    + print_deadline_rq(m, cpu, dl_rq);
    + rcu_read_unlock();
    +}
    +#endif /* CONFIG_SCHED_DEBUG */
    diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
    index efb8440..809ba55 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_deadline_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);
    +
    + 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_deadline_last_entity(dl_rq);
    + if (last)
    + max_deadline = last->deadline;
    + 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);
    @@ -301,6 +333,7 @@ static void print_cpu(struct seq_file *m, int cpu)
    #endif
    print_cfs_stats(m, cpu);
    print_rt_stats(m, cpu);
    + print_deadline_stats(m, cpu);

    print_rq(m, rq, cpu);
    }
    --
    1.6.0.4
    --
    <<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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