linux-kernel - Re: [PATCH 2/3] mm, memory_hotplug: drop CONFIG_MOVABLE

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Message-ID: <519c2906-d2f5-4069-2d6a-d7c199e5980b@suse.cz>
Date:   Mon, 29 May 2017 14:08:02 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, Mel Gorman <mgorman@...e.de>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>,
        slaoub@...il.com, Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 2/3] mm, memory_hotplug: drop CONFIG_MOVABLE_NODE

On 05/29/2017 01:41 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> 
> 20b2f52b73fe ("numa: add CONFIG_MOVABLE_NODE for movable-dedicated
> node") has introduced CONFIG_MOVABLE_NODE without a good explanation on
> why it is actually useful. It makes a lot of sense to make movable node
> semantic opt in but we already have that because the feature has to be
> explicitly enabled on the kernel command line. A config option on top
> only makes the configuration space larger without a good reason. It also
> adds an additional ifdefery that pollutes the code. Just drop the config
> option and make it de-facto always enabled. This shouldn't introduce any
> change to the semantic.
> 
> Acked-by: Reza Arbab <arbab@...ux.vnet.ibm.com>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>