linux-kernel - Re: [PATCH v6 5/6] sched: replace capacity

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Message-ID: <CAKfTPtB3-M+pXaurDeWkWGNJ3_mU-FN+EnshGE-eg_r41Hppag@mail.gmail.com>
Date:	Thu, 25 Sep 2014 10:35:03 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"riel@...hat.com" <riel@...hat.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	"efault@....de" <efault@....de>,
	"nicolas.pitre@...aro.org" <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"pjt@...gle.com" <pjt@...gle.com>,
	"bsegall@...gle.com" <bsegall@...gle.com>
Subject: Re: [PATCH v6 5/6] sched: replace capacity_factor by usage

On 24 September 2014 19:48, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
> On 23/09/14 17:08, Vincent Guittot wrote:
>

[snip]

>
> This review (by PeterZ) during v5 of your patch-set recommended some
> renaming (e.g. s/group_has_free_capacity/group_has_capacity and
> s/group_out_of_capacity/group_no_capacity as well as reordering of the
> parameters which I agree with:
>
> https://lkml.org/lkml/2014/9/11/706

Ah... you're right, these changes have passed through my seance of renaming

>
>>
>> -/*

[snip]

>> -       if (sgs->group_capacity_factor > sgs->sum_nr_running)
>> -               sgs->group_has_free_capacity = 1;
>> +       sgs->group_type = group_classify(group, sgs, env);
>> +
>> +       sgs->group_out_of_capacity = group_is_overloaded(sgs, env);
>
> In case sgs->group_type is group_overloaded you could set
> sgs->group_out_of_capacity to 1 without calling group_is_overloaded again.

I prefer to keep sgs->group_out_of_capacity = group_is_overloaded(sgs,
env) and use it in group_classify in case of future changes in the
classification order

Regards,
Vincent
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 7cdf271e8e52..52d441c92a4f 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -6037,7 +6037,8 @@ static inline void update_sg_lb_stats(struct
> lb_env *env,
>
>         sgs->group_type = group_classify(group, sgs, env);
>
> -       sgs->group_out_of_capacity = group_is_overloaded(sgs, env);
> +       if (sgs->group_type == group_overloaded)
> +               sgs->group_out_of_capacity = 1;
>  }
>
>>  }
>>
>>  /**
>> @@ -6198,17 +6163,21 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
>
> [...]
>
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