From: Vincent Guittot <vincent.guittot@linaro.org>
To: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
"mingo@redhat.com" <mingo@redhat.com>,
Dietmar Eggemann <dietmar.eggemann@arm.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 14:40:14 +0200 [thread overview]
Message-ID: <CAKfTPtD3fx5opmc3PchceDz1vrZo+tDKVezZGGoNs=37nqiCVQ@mail.gmail.com> (raw)
In-Reply-To: <1466615004-3503-7-git-send-email-morten.rasmussen@arm.com>
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
>
> cc: Ingo Molnar <mingo@redhat.com>
> cc: Peter Zijlstra <peterz@infradead.org>
>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
> Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
> ---
> kernel/sched/core.c | 9 +++++++++
> kernel/sched/sched.h | 2 ++
> 2 files changed, 11 insertions(+)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index fe39118ffdfb..5093765e9930 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -6855,6 +6855,7 @@ static int build_sched_domains(const struct cpumask *cpu_map,
> enum s_alloc alloc_state;
> struct sched_domain *sd;
> struct s_data d;
> + struct rq *rq = NULL;
> int i, ret = -ENOMEM;
>
> alloc_state = __visit_domain_allocation_hell(&d, cpu_map);
> @@ -6905,11 +6906,19 @@ static int build_sched_domains(const struct cpumask *cpu_map,
> /* Attach the domains */
> rcu_read_lock();
> for_each_cpu(i, cpu_map) {
> + rq = cpu_rq(i);
> sd = *per_cpu_ptr(d.sd, i);
> cpu_attach_domain(sd, d.rd, i);
> +
> + if (rq->cpu_capacity_orig > rq->rd->max_cpu_capacity)
> + rq->rd->max_cpu_capacity = rq->cpu_capacity_orig;
> }
> rcu_read_unlock();
>
> + if (rq)
> + pr_info("span: %*pbl (max cpu_capacity = %lu)\n",
> + cpumask_pr_args(cpu_map), rq->rd->max_cpu_capacity);
> +
> ret = 0;
> error:
> __free_domain_allocs(&d, alloc_state, cpu_map);
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 72f1f3087b04..3e9904ef224f 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -564,6 +564,8 @@ struct root_domain {
> */
> cpumask_var_t rto_mask;
> struct cpupri cpupri;
> +
> + unsigned long max_cpu_capacity;
> };
>
> extern struct root_domain def_root_domain;
> --
> 1.9.1
>
next prev parent reply other threads:[~2016-07-13 12:40 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 [this message]
2016-07-13 13:48 ` Dietmar Eggemann
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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