linux-kernel - Re: [PATCH 1/2] sched/topology: Set correct numa topology type

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Message-ID: <20180821135949.GI24082@hirez.programming.kicks-ass.net>
Date:   Tue, 21 Aug 2018 15:59:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Andre Wild <wild@...ux.vnet.ibm.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 1/2] sched/topology: Set correct numa topology type

On Tue, Aug 21, 2018 at 04:02:58AM -0700, Srikar Dronamraju wrote:
> * Srikar Dronamraju <srikar@...ux.vnet.ibm.com> [2018-08-10 22:30:18]:
> 
> > With commit 051f3ca02e46 ("sched/topology: Introduce NUMA identity node
> > sched domain") scheduler introduces an new numa level. However this
> > leads to numa topology on 2 node systems no more marked as NUMA_DIRECT.
> > After this commit, it gets reported as NUMA_BACKPLANE. This is because
> > sched_domains_numa_level is now 2 on 2 node systems.
> > 
> > Fix this by allowing setting systems that have upto 2 numa levels as
> > NUMA_DIRECT.
> > 
> > While here remove a code that assumes level can be 0.
> > 
> > Fixes: 051f3ca02e46 "Introduce NUMA identity node sched domain"
> > Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> > ---
> 
> Hey Peter,
> 
> Did you look at these two patches?

Nope, been on holidays and the inbox is an even bigger mess than normal.
I'll get to it, eventually :/