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Subject: Re: [PATCH] mm, memory_hotplug: support movable_node for hotplugable
 nodes
To: Wei Yang <richard.weiyang@gmail.com>, Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        Mel Gorman <mgorman@suse.de>, Andrea Arcangeli <aarcange@redhat.com>,
        Reza Arbab <arbab@linux.vnet.ibm.com>,
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        Kani Toshimitsu <toshi.kani@hpe.com>, slaoub@gmail.com,
        Joonsoo Kim <js1304@gmail.com>, Andi Kleen <ak@linux.intel.com>,
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        Igor Mammedov <imammedo@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>
References: <20170608122318.31598-1-mhocko@kernel.org>
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From: Vlastimil Babka <vbabka@suse.cz>
Message-ID: <3e0a47c9-d51d-3d73-e876-abc1c5c81080@suse.cz>
Date: Wed, 14 Jun 2017 11:07:31 +0200
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On 06/14/2017 11:06 AM, Wei Yang wrote:
> On Mon, Jun 12, 2017 at 08:45:02AM +0200, Michal Hocko wrote:
>> On Mon 12-06-17 12:28:32, Wei Yang wrote:
>>> On Thu, Jun 08, 2017 at 02:23:18PM +0200, Michal Hocko wrote:
>>>> From: Michal Hocko <mhocko@suse.com>
>>>>
>>>> movable_node kernel parameter allows to make hotplugable NUMA
>>>> nodes to put all the hotplugable memory into movable zone which
>>>> allows more or less reliable memory hotremove.  At least this
>>>> is the case for the NUMA nodes present during the boot (see
>>>> find_zone_movable_pfns_for_nodes).
>>>>
>>>
>>> When movable_node is enabled, we would have overlapped zones, right?
>>
>> It won't based on this patch. See movable_pfn_range
> 
> I did grep in source code, but not find movable_pfn_range.

This patch is adding it.

> Could you share some light on that?
> 
>>