linux-kernel - Re: [PATCH v3 04/10] sched/fair: rework load

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Date:   Wed, 2 Oct 2019 11:21:20 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Quentin Perret <quentin.perret@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        Hillf Danton <hdanton@...a.com>
Subject: Re: [PATCH v3 04/10] sched/fair: rework load_balance

On 02/10/2019 08:44, Vincent Guittot wrote:
> On Tue, 1 Oct 2019 at 18:53, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
>>
>> On 01/10/2019 10:14, Vincent Guittot wrote:
>>> On Mon, 30 Sep 2019 at 18:24, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
>>>>
>>>> Hi Vincent,
>>>>
>>>> On 19/09/2019 09:33, Vincent Guittot wrote:
>>
>> [...]
>>
>>>>> @@ -7347,7 +7362,7 @@ static int detach_tasks(struct lb_env *env)
>>>>>   {
>>>>>         struct list_head *tasks = &env->src_rq->cfs_tasks;
>>>>>         struct task_struct *p;
>>>>> -     unsigned long load;
>>>>> +     unsigned long util, load;
>>>>
>>>> Minor: Order by length or reduce scope to while loop ?
>>>
>>> I don't get your point here
>>
>> Nothing dramatic here! Just
>>
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index d0c3aa1dc290..a08f342ead89 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -7333,8 +7333,8 @@ static const unsigned int sched_nr_migrate_break = 32;
>>  static int detach_tasks(struct lb_env *env)
>>  {
>>         struct list_head *tasks = &env->src_rq->cfs_tasks;
>> -       struct task_struct *p;
>>         unsigned long load, util;
>> +       struct task_struct *p;
> 
> hmm... I still don't get this.
> We usually gather pointers instead of interleaving them with other varaiables

I thought we should always order local variable declarations from
longest to shortest line but can't find this rule in coding-style.rst
either.

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