linux-kernel - Re: [RFC][PATCH 0/9] sched: Power scheduler design proposal

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Message-ID: <51EFEFD4.4020808@linux.intel.com>
Date:	Wed, 24 Jul 2013 08:16:36 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Morten Rasmussen <morten.rasmussen@....com>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>,
	"alex.shi@...el.com" <alex.shi@...el.com>,
	"efault@....de" <efault@....de>, "pjt@...gle.com" <pjt@...gle.com>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"corbet@....net" <corbet@....net>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>
Subject: Re: [RFC][PATCH 0/9] sched: Power scheduler design proposal


> Given that the power topology is taken into account, a sort
> left/right-like mechanism would only help performance insensitive tasks
> on big.LITTLE. Performance sensitive tasks that each can use more than
> a little cpu should move in the opposite direction. Well, directly to a
> big cpu, even if some little cpus are idle.
>
> It can be discussed whether smaller performance sensitive tasks that
> would fit on a little cpu should be put on a little or big cpu. That
> would depend on the nature of the task and if other tasks depend on it.

yeah that makes it fun

just a question for my education; is there overlap between big and little?
meaning, is the "highest speed of little" as fast, or faster than "lowest speed of big"
or are those strictly disjoint?

(if there's overlap that gives some room for the scheduler to experiment)

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