On Thu, Sep 24, 2020 at 09:47:55AM +0800 Xianting Tian wrote:
> In the file fair.c, sometims update_tg_load_avg(cfs_rq, 0) is used,
> sometimes update_tg_load_avg(cfs_rq, false) is used.
> update_tg_load_avg() has the parameter force, but in current code,
> it never set 1 or true to it, so remove the force parameter.
>
> Signed-off-by: Xianting Tian <tian.xiant...@h3c.com>
> ---
> kernel/sched/fair.c | 19 +++++++++----------
> 1 file changed, 9 insertions(+), 10 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 1a68a0536..7056fa97f 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -831,7 +831,7 @@ void init_entity_runnable_average(struct sched_entity *se)
> void post_init_entity_util_avg(struct task_struct *p)
> {
> }
> -static void update_tg_load_avg(struct cfs_rq *cfs_rq, int force)
> +static void update_tg_load_avg(struct cfs_rq *cfs_rq)
> {
> }
> #endif /* CONFIG_SMP */
> @@ -3288,7 +3288,6 @@ static inline void cfs_rq_util_change(struct cfs_rq
> *cfs_rq, int flags)
> /**
> * update_tg_load_avg - update the tg's load avg
> * @cfs_rq: the cfs_rq whose avg changed
> - * @force: update regardless of how small the difference
> *
> * This function 'ensures': tg->load_avg := \Sum tg->cfs_rq[]->avg.load.
> * However, because tg->load_avg is a global value there are performance
> @@ -3300,7 +3299,7 @@ static inline void cfs_rq_util_change(struct cfs_rq
> *cfs_rq, int flags)
> *
> * Updating tg's load_avg is necessary before update_cfs_share().
> */
> -static inline void update_tg_load_avg(struct cfs_rq *cfs_rq, int force)
> +static inline void update_tg_load_avg(struct cfs_rq *cfs_rq)
> {
> long delta = cfs_rq->avg.load_avg - cfs_rq->tg_load_avg_contrib;
>
> @@ -3310,7 +3309,7 @@ static inline void update_tg_load_avg(struct cfs_rq
> *cfs_rq, int force)
> if (cfs_rq->tg == &root_task_group)
> return;
>
> - if (force || abs(delta) > cfs_rq->tg_load_avg_contrib / 64) {
> + if (abs(delta) > cfs_rq->tg_load_avg_contrib / 64) {
> atomic_long_add(delta, &cfs_rq->tg->load_avg);
> cfs_rq->tg_load_avg_contrib = cfs_rq->avg.load_avg;
> }
> @@ -3612,7 +3611,7 @@ static inline bool skip_blocked_update(struct
> sched_entity *se)
>
> #else /* CONFIG_FAIR_GROUP_SCHED */
>
> -static inline void update_tg_load_avg(struct cfs_rq *cfs_rq, int force) {}
> +static inline void update_tg_load_avg(struct cfs_rq *cfs_rq) {}
>
> static inline int propagate_entity_load_avg(struct sched_entity *se)
> {
> @@ -3800,13 +3799,13 @@ static inline void update_load_avg(struct cfs_rq
> *cfs_rq, struct sched_entity *s
> * IOW we're enqueueing a task on a new CPU.
> */
> attach_entity_load_avg(cfs_rq, se);
> - update_tg_load_avg(cfs_rq, 0);
> + update_tg_load_avg(cfs_rq);
>
> } else if (decayed) {
> cfs_rq_util_change(cfs_rq, 0);
>
> if (flags & UPDATE_TG)
> - update_tg_load_avg(cfs_rq, 0);
> + update_tg_load_avg(cfs_rq);
> }
> }
>
> @@ -7887,7 +7886,7 @@ static bool __update_blocked_fair(struct rq *rq, bool
> *done)
> struct sched_entity *se;
>
> if (update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq)) {
> - update_tg_load_avg(cfs_rq, 0);
> + update_tg_load_avg(cfs_rq);
>
> if (cfs_rq == &rq->cfs)
> decayed = true;
> @@ -10786,7 +10785,7 @@ static void detach_entity_cfs_rq(struct sched_entity
> *se)
> /* Catch up with the cfs_rq and remove our load when we leave */
> update_load_avg(cfs_rq, se, 0);
> detach_entity_load_avg(cfs_rq, se);
> - update_tg_load_avg(cfs_rq, false);
> + update_tg_load_avg(cfs_rq);
> propagate_entity_cfs_rq(se);
> }
>
> @@ -10805,7 +10804,7 @@ static void attach_entity_cfs_rq(struct sched_entity
> *se)
> /* Synchronize entity with its cfs_rq */
> update_load_avg(cfs_rq, se, sched_feat(ATTACH_AGE_LOAD) ? 0 :
> SKIP_AGE_LOAD);
> attach_entity_load_avg(cfs_rq, se);
> - update_tg_load_avg(cfs_rq, false);
> + update_tg_load_avg(cfs_rq);
> propagate_entity_cfs_rq(se);
> }
>
> --
> 2.17.1
>
LGTM,
Reviewed-by: Phil Auld <pa...@redhat.com>
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