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Re: [RFC PATCH] mm, memory_hotplug: support movable_node for hotplugable nodes

From Reza Arbab <arbab@linux.vnet.ibm.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCH] mm, memory_hotplug: support movable_node for hotplugable nodes
Date 2017-06-01 17:20 +0200
Message-ID <tNA3g-4do-21@gated-at.bofh.it> (permalink)
References <tNxoK-2tN-3@gated-at.bofh.it> <tNz7c-3D6-35@gated-at.bofh.it> <tNzgS-3Gr-17@gated-at.bofh.it>
Organization IBM Linux Technology Center

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On Thu, Jun 01, 2017 at 04:22:28PM +0200, Michal Hocko wrote:
>On Thu 01-06-17 16:11:55, Vlastimil Babka wrote:
>> Simple should work, hopefully.
>> - if memory is hotplugged, it's obviously hotplugable, so we don't have
>> to rely on BIOS description.
>
>Not sure I understand. We do not have any information about the hotplug
>status at the time we do online.

The x86 SRAT (or the dt, on other platforms) can describe memory as 
hotpluggable. See memblock_mark_hotplug(). That's only for memory 
present at boot, though.

He's saying that since the memory was added after boot, it is by 
definition hotpluggable. There's no need to check for that 
marking/description.

-- 
Reza Arbab

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Thread

[RFC PATCH] mm, memory_hotplug: support movable_node for hotplugable nodes Michal Hocko <mhocko@kernel.org> - 2017-06-01 14:30 +0200
  Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Vlastimil Babka <vbabka@suse.cz> - 2017-06-01 16:20 +0200
    Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Michal Hocko <mhocko@kernel.org> - 2017-06-01 16:30 +0200
      Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-06-01 17:20 +0200
        Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Michal Hocko <mhocko@kernel.org> - 2017-06-01 17:40 +0200
          Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-06-01 17:50 +0200
            Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Michal Hocko <mhocko@kernel.org> - 2017-06-01 18:00 +0200
              Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-06-01 18:10 +0200
  Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-06-01 18:10 +0200
    Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Michal Hocko <mhocko@kernel.org> - 2017-06-01 18:20 +0200
      Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-06-01 18:50 +0200
  Re: [RFC PATCH] mm, memory_hotplug: support movable_node for  hotplugable nodes Michal Hocko <mhocko@kernel.org> - 2017-06-05 10:20 +0200

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