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

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Date:	Thu, 25 Sep 2014 20:19:42 +0100
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
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 25/09/14 09:35, Vincent Guittot wrote:
> 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

What about the ordering of the function parameters in
group_has_capacity, group_is_overloaded and group_type group_classify?

All the existing *load balance* related functions in fair.c seem to
follow this (struct lb_env *env, struct sd_lb_stats *sds, struct
sched_group *group, struct sg_lb_stats *sgs) order.

> 
>>
>>>
>>> -/*
> 
> [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

Ok, but than group_is_overloaded is called twice at the end of
update_sg_lb_stats with exactly the same result. Looks weird in my traces.

> 
[...]


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