linux-kernel - Re: [RFC][PATCH 1/2] ARM64: add cpu topology definition

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Message-ID: <51F640AB.2050709@arm.com>
Date:	Mon, 29 Jul 2013 11:15:07 +0100
From:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
CC:	Hanjun Guo <hanjun.guo@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Patch Tracking <patches@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	linaro-acpi <linaro-acpi@...ts.linaro.org>,
	Will Deacon <Will.Deacon@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Naresh Bhat <naresh.bhat@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Sudeep.KarkadaNagesha@....com
Subject: Re: [RFC][PATCH 1/2] ARM64: add cpu topology definition

On 29/07/13 10:46, Vincent Guittot wrote:
> On 27 July 2013 12:42, Hanjun Guo <hanjun.guo@...aro.org> wrote:
>> Power aware scheduling needs the cpu topology information to improve the
>> cpu scheduler decision making.
> 
> It's not only power aware scheduling. The scheduler already uses
> topology and cache sharing when  CONFIG_SCHED_MC and/or
> CONFIG_SCHED_SMT are enable. So you should also add these configs for
> arm64 so the scheduler can use it
> 
Just for my knowledge, I thought power aware using SCHED_MC/SMT was
removed. I see commit 8e7fbcbc22c12414bcc9dfdd683637f58fb32759 "sched:
Remove stale power aware scheduling remnants and dysfunctional knobs"
I may be missing something here.

Regards,
Sudeep

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