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sched/fair: Always trigger resched at the end of a protected period 

Always trigger a resched after a protected period even if the entity is
still eligible. It can happen that an entity remains eligible at the end
of the protected period but must let an entity with a shorter slice to run
in order to keep its lag shorter than slice. This is particulalry true
with run to parity which tries to maximize the lag.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250708165630.1948751-7-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2025-07-08 18:56:30 +02:00 committed by Peter Zijlstra
parent 3a0baa8e6c
commit 0b9ca2dcab
1 changed files with 1 additions and 9 deletions
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10
kernel/sched/fair.c
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@ -1182,14 +1182,6 @@ static inline void update_curr_task(struct task_struct *p, s64 delta_exec)
cgroup_account_cputime(p, delta_exec);
}
static inline bool resched_next_slice(struct cfs_rq *cfs_rq, struct sched_entity *curr)
{
if (protect_slice(curr))
return false;
return !entity_eligible(cfs_rq, curr);
}
/*
* Used by other classes to account runtime.
*/
@ -1250,7 +1242,7 @@ static void update_curr(struct cfs_rq *cfs_rq)
if (cfs_rq->nr_queued == 1)
return;
if (resched || resched_next_slice(cfs_rq, curr)) {
if (resched || !protect_slice(curr)) {
resched_curr_lazy(rq);
clear_buddies(cfs_rq, curr);
}