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From: Vincent Guittot <vincent.guittot@linaro.org>
To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
	dietmar.eggemann@arm.com, rostedt@goodmis.org,
	bsegall@google.com, mgorman@suse.de, bristot@redhat.com,
	linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH v3 4/5] sched/fair: Remove sysctl_sched_migration_cost condition
Date: Tue, 19 Oct 2021 14:35:36 +0200	[thread overview]
Message-ID: <20211019123537.17146-5-vincent.guittot@linaro.org> (raw)
In-Reply-To: <20211019123537.17146-1-vincent.guittot@linaro.org>

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>
---
 kernel/sched/fair.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e50fd751e1df..57eae0ebc492 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -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)
-- 
2.17.1


  parent reply	other threads:[~2021-10-19 12:36 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-19 12:35 [PATCH v3 0/5] Improve newidle lb cost tracking and early abort Vincent Guittot
2021-10-19 12:35 ` [PATCH v3 1/5] sched/fair: Account update_blocked_averages in newidle_balance cost Vincent Guittot
2021-10-21  9:43   ` Mel Gorman
2021-10-31 10:16   ` [tip: sched/core] " tip-bot2 for Vincent Guittot
2021-10-19 12:35 ` [PATCH v3 2/5] sched/fair: Skip update_blocked_averages if we are defering load balance Vincent Guittot
2021-10-21  9:44   ` Mel Gorman
2021-10-21 12:45     ` Vincent Guittot
2021-10-31 10:16   ` [tip: sched/core] " tip-bot2 for Vincent Guittot
2021-10-19 12:35 ` [PATCH 3/5] sched/fair: Wait before decaying max_newidle_lb_cost Vincent Guittot
2021-10-21  9:45   ` Mel Gorman
2021-10-29 10:01   ` Dietmar Eggemann
2021-10-29 12:19     ` Vincent Guittot
2021-10-31 10:16   ` [tip: sched/core] " tip-bot2 for Vincent Guittot
2021-10-19 12:35 ` Vincent Guittot [this message]
2021-10-21  9:46   ` [PATCH v3 4/5] sched/fair: Remove sysctl_sched_migration_cost condition Mel Gorman
2021-10-29 10:01   ` Dietmar Eggemann
2021-10-29 12:30     ` Vincent Guittot
2021-10-31 10:16   ` [tip: sched/core] " tip-bot2 for Vincent Guittot
2021-10-19 12:35 ` [PATCH v3 5/5] sched/fair: cleanup newidle_balance Vincent Guittot
2021-10-21  9:46   ` Mel Gorman
2021-10-31 10:16   ` [tip: sched/core] sched/fair: Cleanup newidle_balance tip-bot2 for Vincent Guittot
2021-10-21  9:52 ` [PATCH v3 0/5] Improve newidle lb cost tracking and early abort Mel Gorman
2021-10-21 12:42   ` Vincent Guittot
2021-10-26 17:25 ` Tim Chen
2021-10-27  8:49   ` Vincent Guittot
2021-10-27 20:53     ` Tim Chen
2021-10-28 12:15       ` Vincent Guittot
2021-10-28 21:36         ` Tim Chen
2021-10-29 17:00     ` Tim Chen
2021-10-31 10:18       ` Vincent Guittot
2021-10-28 23:25 ` Joel Fernandes
2021-10-29  7:49   ` Vincent Guittot
2021-10-29 19:37     ` Joel Fernandes
2021-10-29 10:01 ` Dietmar Eggemann

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