Messages in this thread Patch in this message | | | From | Chengming Zhou <> | Subject | [PATCH v5 1/9] sched/fair: maintain task se depth in set_task_rq() | Date | Thu, 18 Aug 2022 11:43:35 +0800 |
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Previously we only maintain task se depth in task_move_group_fair(), if a !fair task change task group, its se depth will not be updated, so commit eb7a59b2c888 ("sched/fair: Reset se-depth when task switched to FAIR") fix the problem by updating se depth in switched_to_fair() too.
Then commit daa59407b558 ("sched/fair: Unify switched_{from,to}_fair() and task_move_group_fair()") unified these two functions, moved se.depth setting to attach_task_cfs_rq(), which further into attach_entity_cfs_rq() with commit df217913e72e ("sched/fair: Factorize attach/detach entity").
This patch move task se depth maintenance from attach_entity_cfs_rq() to set_task_rq(), which will be called when CPU/cgroup change, so its depth will always be correct.
This patch is preparation for the next patch.
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org> --- kernel/sched/fair.c | 8 -------- kernel/sched/sched.h | 1 + 2 files changed, 1 insertion(+), 8 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index a71d6686149b..c5ee08b187ec 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -11726,14 +11726,6 @@ static void attach_entity_cfs_rq(struct sched_entity *se) { struct cfs_rq *cfs_rq = cfs_rq_of(se); -#ifdef CONFIG_FAIR_GROUP_SCHED - /* - * Since the real-depth could have been changed (only FAIR - * class maintain depth value), reset depth properly. - */ - se->depth = se->parent ? se->parent->depth + 1 : 0; -#endif - /* 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); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index ddcfc7837595..628ffa974123 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1932,6 +1932,7 @@ static inline void set_task_rq(struct task_struct *p, unsigned int cpu) set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]); p->se.cfs_rq = tg->cfs_rq[cpu]; p->se.parent = tg->se[cpu]; + p->se.depth = tg->se[cpu] ? tg->se[cpu]->depth + 1 : 0; #endif #ifdef CONFIG_RT_GROUP_SCHED -- 2.37.2
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