Date: Thu, 1 Jun 2017 18:14:54 +0200
From: Michal Hocko <mhocko@kernel.org>
To: Reza Arbab <arbab@linux.vnet.ibm.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Jerome Glisse <jglisse@redhat.com>,
        Yasuaki Ishimatsu <yasu.isimatu@gmail.com>, qiuxishi@huawei.com,
        Kani Toshimitsu <toshi.kani@hpe.com>, slaoub@gmail.com,
        Joonsoo Kim <js1304@gmail.com>, Andi Kleen <ak@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Daniel Kiper <daniel.kiper@oracle.com>,
        Igor Mammedov <imammedo@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH] mm, memory_hotplug: support movable_node for
 hotplugable nodes
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On Thu 01-06-17 11:02:28, Reza Arbab wrote:
> On Thu, Jun 01, 2017 at 02:20:04PM +0200, Michal Hocko wrote:
> >Teach move_pfn_range that MMOP_ONLINE_KEEP can use the movable zone if
> >movable_node is enabled and the range doesn't overlap with the existing
> >normal zone. This should provide a reasonable default onlining strategy.
> 
> I like it. If your distro has some auto-onlining udev rule like
> 
> SUBSYSTEM=="memory", ACTION=="add", ATTR{state}=="offline", ATTR{state}="online"
> 
> You could get things onlined as movable just by putting movable_node in
> the boot params, without changing/modifying the rule.

yes this is the primary point of the patch ;)
-- 
Michal Hocko
SUSE Labs