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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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).

Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)