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[Deepin-Kernel-SIG] [linux 6.6-y] [Upstream] sched/fair: Forfeit vruntime on yield #1395

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[Deepin-Kernel-SIG] [linux 6.6-y] [Upstream] sched/fair: Forfeit vruntime on yield #1395

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14 changes: 13 additions & 1 deletion kernel/sched/fair.c
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Original file line number Diff line number Diff line change
Expand Up @@ -8783,7 +8783,19 @@ static void yield_task_fair(struct rq *rq)
*/
rq_clock_skip_update(rq);

se->deadline += calc_delta_fair(se->slice, se);
/*
* Forfeit the remaining vruntime, only if the entity is eligible. This
* condition is necessary because in core scheduling we prefer to run
* ineligible tasks rather than force idling. If this happens we may
* end up in a loop where the core scheduler picks the yielding task,
* which yields immediately again; without the condition the vruntime
* ends up quickly running away.
*/
if (entity_eligible(cfs_rq, se)) {
se->vruntime = se->deadline;
se->deadline += calc_delta_fair(se->slice, se);
update_min_vruntime(cfs_rq);
}
}

static bool yield_to_task_fair(struct rq *rq, struct task_struct *p)
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