From: Jiang Biao <benbjiang@gmail.com>
To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org
Cc: dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de,
linux-kernel@vger.kernel.org, Jiang Biao <benbjiang@tencent.com>
Subject: [PATCH] sched/fair: reduce preemption with IDLE tasks runable
Date: Sat, 1 Aug 2020 10:32:48 +0800 [thread overview]
Message-ID: <20200801023248.90104-1-benbjiang@gmail.com> (raw)
From: Jiang Biao <benbjiang@tencent.com>
No need to preempt when there are only one runable CFS task with
other IDLE tasks on runqueue. The only one CFS task would always
be picked in that case.
Signed-off-by: Jiang Biao <benbjiang@tencent.com>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 04fa8dbcfa4d..8fb80636b010 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4527,7 +4527,7 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
return;
#endif
- if (cfs_rq->nr_running > 1)
+ if (cfs_rq->nr_running > cfs_rq.idle_h_nr_running + 1)
check_preempt_tick(cfs_rq, curr);
}
--
2.21.0
next reply other threads:[~2020-08-01 2:33 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-01 2:32 Jiang Biao [this message]
2020-08-03 8:16 ` Dietmar Eggemann
2020-08-03 11:26 ` [PATCH] sched/fair: reduce preemption with IDLE tasks runable(Internet mail) benbjiang(蒋彪)
2020-08-06 13:29 ` Dietmar Eggemann
2020-08-06 15:52 ` benbjiang(蒋彪)
2020-08-10 13:24 ` Dietmar Eggemann
2020-08-11 0:41 ` benbjiang(蒋彪)
2020-08-11 15:54 ` Dietmar Eggemann
2020-08-12 3:19 ` benbjiang(蒋彪)
2020-08-12 18:39 ` Dietmar Eggemann
2020-08-13 23:55 ` benbjiang(蒋彪)
2020-08-17 8:57 ` Dietmar Eggemann
2020-08-17 12:05 ` benbjiang(蒋彪)
2020-08-19 10:46 ` Dietmar Eggemann
2020-08-19 11:05 ` Vincent Guittot
2020-08-19 11:55 ` Dietmar Eggemann
2020-08-19 14:27 ` benbjiang(蒋彪)
2020-08-19 14:55 ` Vincent Guittot
2020-08-20 0:13 ` benbjiang(蒋彪)
2020-08-20 7:35 ` Vincent Guittot
2020-08-20 11:27 ` benbjiang(蒋彪)
2020-08-20 12:45 ` Vincent Guittot
2020-08-20 14:28 ` Jiang Biao
2020-08-20 14:36 ` Vincent Guittot
2020-08-21 0:14 ` Jiang Biao
2020-08-19 14:10 ` benbjiang(蒋彪)
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