linux-kernel - Re: [PATCH/RFC 2/5] [PATCH] sched: pass sched_domain_level to sched_power_savings

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Message-ID: <20100819114102.GE4659@loge.amd.com>
Date:	Thu, 19 Aug 2010 13:41:02 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH/RFC 2/5] [PATCH] sched: pass sched_domain_level to
 sched_power_savings_store

On Mon, Aug 16, 2010 at 04:29:57AM -0400, Peter Zijlstra wrote:
> On Thu, 2010-08-12 at 19:25 +0200, Heiko Carstens wrote:
> > Pass the corresponding sched domain level to sched_power_savings_store instead
> > of a yes/no flag which indicates if the level is SMT or MC.
> > This is needed to easily extend the function so it can be used for a third
> > level. 
> 
> Ah, so the plan is to reduce the number of knobs, not create more.

Don't think so.

> Sysadmins really aren't interested in having a powersavings knob per
> topology level.

It just allows to use the same store functions for three instead of
two different knobs.


Andreas



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