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sched/fair: Remove sysctl_sched_migration_cost condition 

With a default value of 500us, sysctl_sched_migration_cost is
significanlty higher than the cost of load_balance. Remove the
condition and rely on the sd->max_newidle_lb_cost to abort
newidle_balance.

Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: https://lore.kernel.org/r/20211019123537.17146-5-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2021-10-19 14:35:36 +02:00 committed by Peter Zijlstra
parent e60b56e46b
commit c5b0a7eefc
1 changed files with 1 additions and 2 deletions
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3
kernel/sched/fair.c
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@ -10895,8 +10895,7 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
rcu_read_lock();
sd = rcu_dereference_check_sched_domain(this_rq->sd);
if (this_rq->avg_idle < sysctl_sched_migration_cost ||
!READ_ONCE(this_rq->rd->overload) ||
if (!READ_ONCE(this_rq->rd->overload) ||
(sd && this_rq->avg_idle < sd->max_newidle_lb_cost)) {
if (sd)