linux-kernel - Re: [RFC PATCH] mm, memory_hotplug: support movable

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Message-Id: <20170601164942.fknio3im3num5pd4@arbab-laptop.localdomain>
Date:   Thu, 1 Jun 2017 11:49:42 -0500
From:   Reza Arbab <arbab@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jerome Glisse <jglisse@...hat.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>
Subject: Re: [RFC PATCH] mm, memory_hotplug: support movable_node for
 hotplugable nodes

On Thu, Jun 01, 2017 at 06:14:54PM +0200, Michal Hocko wrote:
>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 ;)

Ha. What can I say, I like restating the obvious!

At some point after all these cleanups/improvements, it would be worth 
making sure Documentation/memory-hotplug.txt is still accurate.

-- 
Reza Arbab