linux-kernel - Re: [RESEND PATCH V5 0/8] remove cpu

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Date:	Tue, 06 May 2014 16:33:38 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	Morten Rasmussen <morten.rasmussen@....com>,
	Fengguang Wu <fengguang.wu@...el.com>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"efault@....de" <efault@....de>,
	"wangyun@...ux.vnet.ibm.com" <wangyun@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mgorman@...e.de" <mgorman@...e.de>
Subject: Re: [RESEND PATCH V5 0/8] remove cpu_load idx


> 
> Maybe the predication is reasonable on per task history. but on a cpu
> load history, with many tasks rebalance. No testing show current method
> is helpful.
> 
> For task load change, scheduler has no idea for its future except guess
> from its history. but for cpu load change, scheduler know this from task
> wakeup and balance, which both under control and its aim.
> 
> 
> I think the first patch of this serial has the same effect of LB_LIAS
> disable. and previous result show performance is good.
> 
> Anyway, I just pushed the following patch to github, maybe fengguang's
> testing system will care this.

Fengguang,

Are there any performance change on
https://github.com/alexshi/power-scheduling.git noload repository?

> 
> diff --git a/kernel/sched/features.h b/kernel/sched/features.h
> index 5716929..0bf649f 100644
> --- a/kernel/sched/features.h
> +++ b/kernel/sched/features.h
> @@ -43,7 +43,7 @@ SCHED_FEAT(ARCH_POWER, true)
> 
>  SCHED_FEAT(HRTICK, false)
>  SCHED_FEAT(DOUBLE_TICK, false)
> -SCHED_FEAT(LB_BIAS, true)
> +SCHED_FEAT(LB_BIAS, false)
> 
> 


-- 
Thanks
    Alex
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