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

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Message-ID: <20100819123238.GG4659@loge.amd.com>
Date:	Thu, 19 Aug 2010 14:32:38 +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 Thu, Aug 19, 2010 at 08:35:11AM -0400, Peter Zijlstra wrote:
> On Thu, 2010-08-19 at 13:41 +0200, Andreas Herrmann wrote:
> > It just allows to use the same store functions for three instead of
> > two different knobs. 
> 
> Creating more knobs for powersave scheduling is a fail.
> 
> We already have 2^3 powersave scheduling states, it should be decreased
> to 2 (namely on/off), not increased to 3^3.

I think it should be possible to select a domain level at which power
saving scheduling should happen (this would result in 3 states in the
z196 case).


Andreas

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