linux-kernel - Re: [RFC PATCH 8/8] arm64: add sysfs cpu

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Message-ID: <20151210155940.GN5727@sirena.org.uk>
Date:	Thu, 10 Dec 2015 15:59:40 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	Juri Lelli <juri.lelli@....com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, peterz@...radead.org,
	vincent.guittot@...aro.org, robh+dt@...nel.org,
	mark.rutland@....com, linux@....linux.org.uk, sudeep.holla@....com,
	lorenzo.pieralisi@....com, catalin.marinas@....com,
	will.deacon@....com, morten.rasmussen@....com
Subject: Re: [RFC PATCH 8/8] arm64: add sysfs cpu_capacity attribute

On Thu, Dec 10, 2015 at 02:15:04PM +0000, Dietmar Eggemann wrote:
> On 23/11/15 14:28, Juri Lelli wrote:

> > The new attribute shows up as:

> >  /sys/devices/system/cpu/cpu*/cpu_capacity

> This sysfs interface is not really needed for arm or arm64. People can
> build the dt blob if they want to change the values. Less code to carry
> ... Let's focus on the core functionality, which is parsing cpu capacity
> from dt file to task scheduler for heterogeneous systems.

That does make the tuning process much more cumbersome - users have to
rebuild and reboot to tweak the numbers rather than just tweaking the
numbers and rerunning the benchmark (which seems like something people
would want to automate).

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