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

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Message-ID: <20150410195046.GB31621@linux.vnet.ibm.com>
Date:	Fri, 10 Apr 2015 12:50:46 -0700
From:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 10.04.2015 [11:08:10 +0200], Peter Zijlstra wrote:
> 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.

Interesting, I will take a look.

-Nish

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