From: Valentin Schneider <valentin.schneider@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Quentin Perret <quentin.perret@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Morten Rasmussen <Morten.Rasmussen@arm.com>,
Phil Auld <pauld@redhat.com>
Subject: Re: [PATCH 3/5] sched/fair: rework load_balance
Date: Mon, 29 Jul 2019 15:28:45 +0100 [thread overview]
Message-ID: <58f79135-4b6c-2507-3f5d-e3c7704bf8b3@arm.com> (raw)
In-Reply-To: <CAKfTPtBTH10k56s-sU3TX+vL6Xas-QArLW-CBz7ZeqU0BNzMQA@mail.gmail.com>
On 26/07/2019 15:47, Vincent Guittot wrote:
[...]
>> If CPU0 runs the load balancer, balancing utilization would mean pulling
>> 2 tasks from CPU1 to reach the domain-average of 40%. The good side of this
>> is that we could save ourselves from running some newidle balances, but
>> I'll admit that's all quite "finger in the air".
>
> Don't forget that scheduler also selects a cpu when task wakeup and
> should cope with such situation
>
Right, although I'm not sure even the slow wakeup path is any good at
balancing utilization.
>>
>>>> happen, but it'd be a shame to repeatedly do this when we could
>>>> preemptively balance utilization.
>>>>
next prev parent reply other threads:[~2019-07-29 14:28 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-19 7:58 [PATCH 0/5] sched/fair: rework the CFS load balance Vincent Guittot
2019-07-19 7:58 ` [PATCH 1/5] sched/fair: clean up asym packing Vincent Guittot
2019-07-19 7:58 ` [PATCH 2/5] sched/fair: rename sum_nr_running to sum_h_nr_running Vincent Guittot
2019-07-19 12:51 ` Peter Zijlstra
2019-07-19 13:44 ` Vincent Guittot
2019-07-26 2:17 ` Srikar Dronamraju
2019-07-26 8:41 ` Vincent Guittot
2019-07-19 7:58 ` [PATCH 3/5] sched/fair: rework load_balance Vincent Guittot
2019-07-19 12:52 ` Peter Zijlstra
2019-07-19 13:46 ` Vincent Guittot
2019-07-19 12:54 ` Peter Zijlstra
2019-07-19 14:02 ` Vincent Guittot
2019-07-20 11:31 ` Peter Zijlstra
2019-07-19 13:06 ` Peter Zijlstra
2019-07-19 13:57 ` Vincent Guittot
2019-07-19 13:12 ` Peter Zijlstra
2019-07-19 14:13 ` Vincent Guittot
2019-07-19 13:22 ` Peter Zijlstra
2019-07-19 13:55 ` Vincent Guittot
2019-07-25 17:17 ` Valentin Schneider
2019-07-26 9:01 ` Vincent Guittot
2019-07-26 10:41 ` Valentin Schneider
2019-07-26 12:30 ` Vincent Guittot
2019-07-26 14:01 ` Valentin Schneider
2019-07-26 14:47 ` Vincent Guittot
2019-07-29 14:28 ` Valentin Schneider [this message]
2019-07-26 13:58 ` Srikar Dronamraju
2019-07-26 14:09 ` Valentin Schneider
2019-07-26 14:42 ` Vincent Guittot
2019-07-31 13:43 ` Srikar Dronamraju
2019-07-31 15:37 ` Vincent Guittot
2019-07-19 7:58 ` [PATCH 4/5] sched/fair: use load instead of runnable load Vincent Guittot
2019-07-19 7:58 ` [PATCH 5/5] sched/fair: evenly spread tasks when not overloaded Vincent Guittot
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