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sched: Always initialize rt_rq's task_group

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rt_rq->tg may be NULL which denotes the root task_group.
Store the pointer to root_task_group directly so that callers may use
rt_rq->tg homogenously.

root_task_group exists always with CONFIG_CGROUPS_SCHED,
CONFIG_RT_GROUP_SCHED depends on that.

This changes root level rt_rq's default limit from infinity to the
value of (originally) global RT throttling.

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250310170442.504716-4-mkoutny@suse.com
This commit is contained in:
Michal Koutný 2025-03-10 18:04:35 +01:00 committed by Peter Zijlstra
parent e285313f08
commit a5a25b32c0
2 changed files with 4 additions and 5 deletions
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7
kernel/sched/rt.c
View File

@ -89,6 +89,7 @@ void init_rt_rq(struct rt_rq *rt_rq)
rt_rq->rt_throttled = 0;
rt_rq->rt_runtime = 0;
raw_spin_lock_init(&rt_rq->rt_runtime_lock);
rt_rq->tg = &root_task_group;
#endif
}
@ -482,9 +483,6 @@ static inline bool rt_task_fits_capacity(struct task_struct *p, int cpu)
static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
{
if (!rt_rq->tg)
return RUNTIME_INF;
return rt_rq->rt_runtime;
}
@ -1154,8 +1152,7 @@ inc_rt_group(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
if (rt_se_boosted(rt_se))
rt_rq->rt_nr_boosted++;
if (rt_rq->tg)
start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
start_rt_bandwidth(&rt_rq->tg->rt_bandwidth);
}
static void

2
kernel/sched/sched.h
View File

@ -821,6 +821,8 @@ struct rt_rq {
unsigned int rt_nr_boosted;
struct rq *rq;
#endif
#ifdef CONFIG_CGROUP_SCHED
struct task_group *tg;
#endif
};