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sched: remove HZ_BW feature hedge

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As a hedge against unexpected user issues commit 88c56cfeaec4
("sched/fair: Block nohz tick_stop when cfs bandwidth in use")
included a scheduler feature to disable the new functionality.
It's been a few releases (v6.6) and no screams, so remove it.

Signed-off-by: Phil Auld <pauld@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lore.kernel.org/r/20240515133705.3632915-1-pauld@redhat.com
This commit is contained in:
Phil Auld 2024-05-15 09:37:05 -04:00 committed by Peter Zijlstra
parent 2c2d962469
commit a58501fb83
3 changed files with 2 additions and 4 deletions
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2
kernel/sched/core.c
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@ -1269,7 +1269,7 @@ bool sched_can_stop_tick(struct rq *rq)
* dequeued by migrating while the constrained task continues to run. * dequeued by migrating while the constrained task continues to run.
* E.g. going from 2->1 without going through pick_next_task(). * E.g. going from 2->1 without going through pick_next_task().
*/ */
if (sched_feat(HZ_BW) && __need_bw_check(rq, rq->curr)) { if (__need_bw_check(rq, rq->curr)) {
if (cfs_task_bw_constrained(rq->curr)) if (cfs_task_bw_constrained(rq->curr))
return false; return false;
} }

2
kernel/sched/fair.c
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@ -6555,7 +6555,7 @@ static void sched_fair_update_stop_tick(struct rq *rq, struct task_struct *p)
{ {
int cpu = cpu_of(rq); int cpu = cpu_of(rq);
if (!sched_feat(HZ_BW) || !cfs_bandwidth_used()) if (!cfs_bandwidth_used())
return; return;
if (!tick_nohz_full_cpu(cpu)) if (!tick_nohz_full_cpu(cpu))

2
kernel/sched/features.h
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@ -85,5 +85,3 @@ SCHED_FEAT(WA_BIAS, true)
SCHED_FEAT(UTIL_EST, true) SCHED_FEAT(UTIL_EST, true)
SCHED_FEAT(LATENCY_WARN, false) SCHED_FEAT(LATENCY_WARN, false)
SCHED_FEAT(HZ_BW, true)