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From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	"mingo@redhat.com" <mingo@redhat.com>,
	Yuyang Du <yuyang.du@intel.com>,
	mgalbraith@suse.de, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 06/13] sched: Store maximum per-cpu capacity in root domain
Date: Wed, 13 Jul 2016 14:48:24 +0100	[thread overview]
Message-ID: <578646A8.1070607@arm.com> (raw)
In-Reply-To: <CAKfTPtD3fx5opmc3PchceDz1vrZo+tDKVezZGGoNs=37nqiCVQ@mail.gmail.com>

On 13/07/16 13:40, Vincent Guittot wrote:
> On 22 June 2016 at 19:03, Morten Rasmussen <morten.rasmussen@arm.com> wrote:
>> From: Dietmar Eggemann <dietmar.eggemann@arm.com>
>>
>> To be able to compare the capacity of the target cpu with the highest
>> available cpu capacity, store the maximum per-cpu capacity in the root
>> domain.
> 
> I thought that the capacity of all CPUS were built so the highest
> capacity of the CPU of the system is 1024  for big LITTLE system . So
> this patch doesn't seem necessary for big.LITTLE system

The asymmetric cpu capacity support currently only has an effect on arm
big.LITTLE (32bit) using the existing 'struct cpu_efficiency
table_efficiency[]' based approach.

So e.g. on TC2 we have 1441 for highest capacity.

[    0.041007] SMP: Total of 5 processors activated (240.00 BogoMIPS).
[    0.041024] CPU: All CPU(s) started in SVC mode.
[    0.041103] CPU0 attaching sched-domain:
[    0.041119]  domain 0: span 0-1 level MC
[    0.041141]   groups: 0 (cpu_capacity = 1441) 1 (cpu_capacity = 1441)
[    0.041179]   domain 1: span 0-4 level DIE
[    0.041199]    groups: 0-1 (cpu_capacity = 2882) 2-4 (cpu_capacity =
1818)
[    0.041245] CPU1 attaching sched-domain:
[    0.041260]  domain 0: span 0-1 level MC
[    0.041279]   groups: 1 (cpu_capacity = 1441) 0 (cpu_capacity = 1441)
[    0.041315]   domain 1: span 0-4 level DIE
[    0.041334]    groups: 0-1 (cpu_capacity = 2882) 2-4 (cpu_capacity =
1818)
[    0.041376] CPU2 attaching sched-domain:
[    0.041391]  domain 0: span 2-4 level MC
[    0.041409]   groups: 2 (cpu_capacity = 606) 3 (cpu_capacity = 606) 4
(cpu_capacity = 606)
[    0.041460]   domain 1: span 0-4 level DIE
[    0.041479]    groups: 2-4 (cpu_capacity = 1818) 0-1 (cpu_capacity =
2882)
..

[...]

  reply	other threads:[~2016-07-13 13:49 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-22 17:03 [PATCH v2 00/13] sched: Clean-ups and asymmetric cpu capacity support Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 01/13] sched: Fix power to capacity renaming in comment Morten Rasmussen
2016-08-10 18:03   ` [tip:sched/core] sched/core: " tip-bot for Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 02/13] sched/fair: Consistent use of prev_cpu in wakeup path Morten Rasmussen
2016-06-22 18:04   ` Rik van Riel
2016-06-23  9:56     ` Morten Rasmussen
2016-06-23 12:24       ` Rik van Riel
2016-08-10 18:03   ` [tip:sched/core] sched/fair: Make the use of prev_cpu consistent in the " tip-bot for Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 03/13] sched/fair: Optimize find_idlest_cpu() when there is no choice Morten Rasmussen
2016-07-13 12:20   ` Vincent Guittot
2016-08-10 18:03   ` [tip:sched/core] " tip-bot for Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 04/13] sched: Introduce SD_ASYM_CPUCAPACITY sched_domain topology flag Morten Rasmussen
2016-07-11  9:55   ` Peter Zijlstra
2016-07-11 10:42     ` Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 05/13] sched: Enable SD_BALANCE_WAKE for asymmetric capacity systems Morten Rasmussen
2016-07-11 10:04   ` Peter Zijlstra
2016-07-11 10:37     ` Morten Rasmussen
2016-07-11 11:04       ` Morten Rasmussen
2016-07-11 11:24         ` Peter Zijlstra
2016-07-12 14:26           ` Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 06/13] sched: Store maximum per-cpu capacity in root domain Morten Rasmussen
2016-07-11 10:18   ` Peter Zijlstra
2016-07-11 16:16     ` Dietmar Eggemann
2016-07-12 11:42       ` Peter Zijlstra
2016-07-13 11:18         ` Dietmar Eggemann
2016-07-13 12:40   ` Vincent Guittot
2016-07-13 13:48     ` Dietmar Eggemann [this message]
2016-07-13 16:37       ` Morten Rasmussen
2016-07-14 13:25         ` Vincent Guittot
2016-07-14 15:15           ` Morten Rasmussen
2016-07-15 11:46             ` Morten Rasmussen
2016-07-15 13:39               ` Vincent Guittot
2016-07-15 16:02                 ` Morten Rasmussen
2016-07-18 12:48                   ` Vincent Guittot
2016-07-18 15:11                     ` Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 07/13] sched/fair: Let asymmetric cpu configurations balance at wake-up Morten Rasmussen
2016-07-11 11:13   ` Peter Zijlstra
2016-07-11 12:32     ` Morten Rasmussen
2016-07-13 12:56   ` Vincent Guittot
2016-07-13 16:14     ` Morten Rasmussen
2016-07-14 13:45       ` Vincent Guittot
2016-07-15  8:37         ` Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 08/13] sched/fair: Compute task/cpu utilization at wake-up more correctly Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 09/13] sched/fair: Consider spare capacity in find_idlest_group() Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 10/13] sched: Add per-cpu max capacity to sched_group_capacity Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 11/13] sched/fair: Avoid pulling tasks from non-overloaded higher capacity groups Morten Rasmussen
2016-06-23 21:20   ` Sai Gurrappadi
2016-06-30  7:49     ` Morten Rasmussen
2016-07-14 16:39       ` Sai Gurrappadi
2016-07-15  8:39         ` Morten Rasmussen
2016-07-12 12:59   ` Peter Zijlstra
2016-07-12 14:34     ` Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 12/13] arm: Set SD_ASYM_CPUCAPACITY for big.LITTLE platforms Morten Rasmussen
2016-06-22 17:03 ` [PATCH v2 13/13] arm: Update arch_scale_cpu_capacity() to reflect change to define Morten Rasmussen
2016-06-28 10:20 ` [PATCH v2 00/13] sched: Clean-ups and asymmetric cpu capacity support Koan-Sin Tan
2016-06-30  7:53   ` Morten Rasmussen
2016-07-08  7:35 ` KEITA KOBAYASHI
2016-07-08  8:18   ` Morten Rasmussen
2016-07-11  8:33 ` Morten Rasmussen
2016-07-11 12:44   ` Vincent Guittot
2016-07-12 13:25   ` Peter Zijlstra
2016-07-12 14:39     ` Morten Rasmussen
2016-07-13 12:06 ` Vincent Guittot
2016-07-13 15:54   ` Morten Rasmussen

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