Re: [PATCH 1/7 v4] sched: factorize attach entity

On 09/26/2016 01:19 PM, Vincent Guittot wrote:

Factorize post_init_entity_util_avg and part of attach_task_cfs_rq in one function attach_entity_cfs_rq

Signed-off-by: Vincent Guittot vincent.guittot@linaro.org

kernel/sched/fair.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 986c10c..e8ed8d1 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -697,9 +697,7 @@ void init_entity_runnable_average(struct sched_entity *se) }

static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq); -static int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq); -static void update_tg_load_avg(struct cfs_rq *cfs_rq, int force); -static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se); +static void attach_entity_cfs_rq(struct sched_entity *se);

/*

• With new tasks being created, their initial util_avgs are extrapolated

@@ -764,9 +762,7 @@ void post_init_entity_util_avg(struct sched_entity *se) } }

You now could move the 'u64 now = cfs_rq_clock_task(cfs_rq);' into the if condition to handle !fair_sched_class tasks.

• update_cfs_rq_load_avg(now, cfs_rq, false);
  

• attach_entity_load_avg(cfs_rq, se);
  

• update_tg_load_avg(cfs_rq, false);
  

• attach_entity_cfs_rq(se);
  

}

#else /* !CONFIG_SMP */ @@ -8501,9 +8497,8 @@ static void detach_task_cfs_rq(struct task_struct *p) update_tg_load_avg(cfs_rq, false); }

-static void attach_task_cfs_rq(struct task_struct *p) +static void attach_entity_cfs_rq(struct sched_entity *se) {

• struct sched_entity *se = &p->se;
  struct cfs_rq *cfs_rq = cfs_rq_of(se);
  

Both callers of attach_entity_cfs_rq() already use cfs_rq_of(se). You could pass it into attach_entity_cfs_rq().

  u64 now = cfs_rq_clock_task(cfs_rq);

@@ -8519,6 +8514,14 @@ static void attach_task_cfs_rq(struct task_struct *p)

The old comment /* Synchronize task ... */ should be changed to /* Synchronize entity ... */

  update_cfs_rq_load_avg(now, cfs_rq, false);
  attach_entity_load_avg(cfs_rq, se);
  update_tg_load_avg(cfs_rq, false);

+}

+static void attach_task_cfs_rq(struct task_struct *p) +{

• struct sched_entity *se = &p->se;
  

• struct cfs_rq *cfs_rq = cfs_rq_of(se);
  

• attach_entity_cfs_rq(se);
  
  if (!vruntime_normalized(p))
          se->vruntime += cfs_rq->min_vruntime;
  
  

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