From: Mel Gorman <mgorman@suse.de>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, bristot@redhat.com,
linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com
Subject: Re: [PATCH v3 2/5] sched/fair: Skip update_blocked_averages if we are defering load balance
Date: Thu, 21 Oct 2021 10:44:12 +0100 [thread overview]
Message-ID: <20211021094412.GC3891@suse.de> (raw)
In-Reply-To: <20211019123537.17146-3-vincent.guittot@linaro.org>
On Tue, Oct 19, 2021 at 02:35:34PM +0200, Vincent Guittot wrote:
> In newidle_balance(), the scheduler skips load balance to the new idle cpu
> when the 1st sd of this_rq is:
>
> this_rq->avg_idle < sd->max_newidle_lb_cost
>
> Doing a costly call to update_blocked_averages() will not be useful and
> simply adds overhead when this condition is true.
>
> Check the condition early in newidle_balance() to skip
> update_blocked_averages() when possible.
>
> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
The Signed-off-by seems to be in the wrong order but otherwise
Acked-by: Mel Gorman <mgorman@suse.de>
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2021-10-21 9:44 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 [this message]
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 ` [PATCH v3 4/5] sched/fair: Remove sysctl_sched_migration_cost condition Vincent Guittot
2021-10-21 9:46 ` 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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