linux-kernel - Re: Topology updates and NUMA-level sched domains

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Message-ID: <20150410090810.GW24151@twins.programming.kicks-ass.net>
Date:	Fri, 10 Apr 2015 11:08:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Boqun Feng <boqun.feng@...ux.vnet.ibm.com>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Anton Blanchard <anton@...ba.org>
Subject: Re: Topology updates and NUMA-level sched domains

On Fri, Apr 10, 2015 at 10:31:53AM +0200, Peter Zijlstra wrote:
> Please, step back, look at what you're doing and ask yourself, will any
> sane person want to use this? Can they use this?
> 
> If so, start by describing the desired user semantics of this work.
> Don't start by cobbling kernel bits togerther until it stops crashing.

Also, please talk to your s390 folks. They've long since realized that
this doesn't work. They've just added big honking caches (their BOOK
stuff) and pretend the system is UMA.
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