linux-kernel - Re: Plumbers: Tweaking scheduler policy micro-conf RFP

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Message-ID: <1337197242.4281.6.camel@twins>
Date:	Wed, 16 May 2012 21:40:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	svaidy@...ux.vnet.ibm.com
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	paulmck@...ux.vnet.ibm.com, smuckle@...cinc.com, khilman@...com,
	Robin.Randhawa@....com, suresh.b.siddha@...el.com,
	thebigcorporation@...il.com, venki@...gle.com,
	panto@...oniou-consulting.com, mingo@...e.hu, paul.brett@...el.com,
	pdeschrijver@...dia.com, pjt@...gle.com, efault@....de,
	fweisbec@...il.com, geoff@...radead.org, rostedt@...dmis.org,
	tglx@...utronix.de, amit.kucheria@...aro.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linaro-sched-sig@...ts.linaro.org,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: Plumbers: Tweaking scheduler policy micro-conf RFP

On Thu, 2012-05-17 at 00:19 +0530, Vaidyanathan Srinivasan wrote:

> Let me take a case of two-socket,quad-core,HT x86 (Nehalem):
> 
> SDTL_SHARE_POWERLINE should be passed along with a cpumask that
> represents sd_init_CPU or cpu_cpu_mask today.  So the number of
> domains we build per-cpu will depend on the topology and the
> sched_powersavings settings. 

No, the topology should at all time be independent of powersavings,
current x86's topology depending on that is one of the biggest warts
ever. Also sched_powersavings, doesn't actually exist anymore.

The NHM-EP from your example should do just two levels since mc and cpu
are identical, I guess we could add a pass that merges identical masks
so you can still specify 3 levels if you want.

The NUMA stuff is done automatically based on SLIT, so you don't need to
go above the socket level.
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