linux-kernel - Re: [RFC][PATCH v5 01/14] sched: add a new arch_sd_local_flags for sched

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Message-ID: <20131112180844.GF21461@twins.programming.kicks-ass.net>
Date:	Tue, 12 Nov 2013 19:08:44 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Lukasz Majewski <l.majewski@...sung.com>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>
Subject: Re: [RFC][PATCH v5 01/14] sched: add a new arch_sd_local_flags for
 sched_domain init

On Tue, Nov 12, 2013 at 05:43:36PM +0000, Dietmar Eggemann wrote:
> This patch removes the sched_domain initializer macros
> SD_[SIBLING|MC|BOOK|CPU]_INIT in core.c and in archs and replaces them
> with calls to the new function sd_init().  The function sd_init
> incorporates the already existing function sd_numa_init().

Your patch retains far too much of the weird behavioural variations we
have, nor does it create a proper separation between topology and
behaviour.

We might indeed have to have a single arch_() function that adds
SD_flags, but please restrict the flags it can set -- never allow it to
set behavioural flags.

Furthermore, I think we want to allow the arch to override the base
topology; we've had desire to add per arch level in the past.. eg. add
an L2 level for some x86 variants.


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