linux-kernel - Re: [PATCH v5 1/3] powerpc/numa: Set numa

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Message-ID: <20200624094843.GA31972@in.ibm.com>
Date:   Wed, 24 Jun 2020 15:18:43 +0530
From:   Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Christopher Lameter <cl@...ux.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v5 1/3] powerpc/numa: Set numa_node for all possible cpus

On Wed, Jun 24, 2020 at 02:58:44PM +0530, Srikar Dronamraju wrote:
> A Powerpc system with multiple possible nodes and with CONFIG_NUMA
> enabled always used to have a node 0, even if node 0 does not any cpus
> or memory attached to it. As per PAPR, node affinity of a cpu is only
> available once its present / online. For all cpus that are possible but
> not present, cpu_to_node() would point to node 0.
> 
> To ensure a cpuless, memoryless dummy node is not online, powerpc need
> to make sure all possible but not present cpu_to_node are set to a
> proper node.
> 
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: "Kirill A. Shutemov" <kirill@...temov.name>
> Cc: Christopher Lameter <cl@...ux.com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Gautham R Shenoy <ego@...ux.vnet.ibm.com>
> Cc: Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>
> Cc: David Hildenbrand <david@...hat.com>
> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

This looks good to me.

Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>

--
Thanks and Regards
gautham.