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    Subject[PATCH 09/16] sched: add schedstats for -deadline tasks.
    Date
    From: Dario Faggioli <raistlin@linux.it>

    Add some typical sched-debug output to dl_rq(s) and some
    schedstats to -deadline tasks.

    Signed-off-by: Dario Faggioli <raistlin@linux.it>
    Signed-off-by: Juri Lelli <juri.lelli@gmail.com>
    ---
    include/linux/sched.h | 13 +++++++++++++
    kernel/sched.c | 2 ++
    kernel/sched_debug.c | 43 +++++++++++++++++++++++++++++++++++++++++++
    kernel/sched_dl.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
    4 files changed, 103 insertions(+), 0 deletions(-)

    diff --git a/include/linux/sched.h b/include/linux/sched.h
    index 5961592..23cca57 100644
    --- a/include/linux/sched.h
    +++ b/include/linux/sched.h
    @@ -1267,6 +1267,15 @@ struct sched_rt_entity {
    #endif
    };

    +#ifdef CONFIG_SCHEDSTATS
    +struct sched_stats_dl {
    + u64 last_dmiss;
    + u64 last_rorun;
    + u64 dmiss_max;
    + u64 rorun_max;
    +};
    +#endif
    +
    struct sched_dl_entity {
    struct rb_node rb_node;
    int nr_cpus_allowed;
    @@ -1307,6 +1316,10 @@ struct sched_dl_entity {
    * own bandwidth to be enforced, thus we need one timer per task.
    */
    struct hrtimer dl_timer;
    +
    +#ifdef CONFIG_SCHEDSTATS
    + struct sched_stats_dl stats;
    +#endif
    };

    struct rcu_node;
    diff --git a/kernel/sched.c b/kernel/sched.c
    index 9461958..ea4787a 100644
    --- a/kernel/sched.c
    +++ b/kernel/sched.c
    @@ -569,6 +569,8 @@ struct dl_rq {

    unsigned long dl_nr_running;

    + u64 exec_clock;
    +
    #ifdef CONFIG_SMP
    /*
    * Deadline values of the currently executing and the
    diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
    index 528032b..8979fa3 100644
    --- a/kernel/sched_debug.c
    +++ b/kernel/sched_debug.c
    @@ -243,6 +243,42 @@ 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 = cpu_rq(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)(dl_rq->x))
    +#define __PN(x) \
    + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(x))
    +#define PN(x) \
    + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", #x, SPLIT_NS(dl_rq->x))
    +
    + P(dl_nr_running);
    + PN(exec_clock);
    + __PN(min_deadline);
    + __PN(max_deadline);
    +
    +#undef PN
    +#undef __PN
    +#undef P
    +}
    +
    extern __read_mostly int sched_clock_running;

    static void print_cpu(struct seq_file *m, int cpu)
    @@ -305,6 +341,7 @@ static void print_cpu(struct seq_file *m, int cpu)
    spin_lock_irqsave(&sched_debug_lock, flags);
    print_cfs_stats(m, cpu);
    print_rt_stats(m, cpu);
    + print_dl_stats(m, cpu);

    rcu_read_lock();
    print_rq(m, rq, cpu);
    @@ -456,6 +493,12 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
    P(se.statistics.nr_wakeups_affine_attempts);
    P(se.statistics.nr_wakeups_passive);
    P(se.statistics.nr_wakeups_idle);
    + if (dl_task(p)) {
    + PN(dl.stats.last_dmiss);
    + PN(dl.stats.dmiss_max);
    + PN(dl.stats.last_rorun);
    + PN(dl.stats.rorun_max);
    + }

    {
    u64 avg_atom, avg_per_cpu;
    diff --git a/kernel/sched_dl.c b/kernel/sched_dl.c
    index 8682ee2..05140bb 100644
    --- a/kernel/sched_dl.c
    +++ b/kernel/sched_dl.c
    @@ -476,6 +476,25 @@ int dl_runtime_exceeded(struct rq *rq, struct sched_dl_entity *dl_se)
    return 0;

    /*
    + * Record statistics about last and maximum deadline
    + * misses and runtime overruns.
    + */
    + if (dmiss) {
    + u64 damount = rq->clock - dl_se->deadline;
    +
    + schedstat_set(dl_se->stats.last_dmiss, damount);
    + schedstat_set(dl_se->stats.dmiss_max,
    + max(dl_se->stats.dmiss_max, damount));
    + }
    + if (rorun) {
    + u64 ramount = -dl_se->runtime;
    +
    + schedstat_set(dl_se->stats.last_rorun, ramount);
    + schedstat_set(dl_se->stats.rorun_max,
    + max(dl_se->stats.rorun_max, ramount));
    + }
    +
    + /*
    * If we are beyond our current deadline and we are still
    * executing, then we have already used some of the runtime of
    * the next instance. Thus, if we do not account that, we are
    @@ -510,6 +529,7 @@ static void update_curr_dl(struct rq *rq)
    max(curr->se.statistics.exec_max, delta_exec));

    curr->se.sum_exec_runtime += delta_exec;
    + schedstat_add(&rq->dl, exec_clock, delta_exec);
    account_group_exec_runtime(curr, delta_exec);

    curr->se.exec_start = rq->clock;
    @@ -855,6 +875,18 @@ static void start_hrtick_dl(struct rq *rq, struct task_struct *p)
    }
    #endif

    +#ifdef CONFIG_SCHED_DEBUG
    +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);
    +}
    +#endif /* CONFIG_SCHED_DEBUG */
    +
    static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
    struct dl_rq *dl_rq)
    {
    @@ -1523,3 +1555,16 @@ static const struct sched_class dl_sched_class = {
    .switched_from = switched_from_dl,
    .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();
    + print_dl_rq(m, cpu, dl_rq);
    + rcu_read_unlock();
    +}
    +#endif /* CONFIG_SCHED_DEBUG */
    --
    1.7.5.4


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