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

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: [RFC PATCH] mm, memory_hotplug: support movable_node for hotplugable nodes
Date 2017-06-01 18:00 +0200
Message-ID <tNAFZ-4sr-47@gated-at.bofh.it> (permalink)
References (1 earlier) <tNz7c-3D6-35@gated-at.bofh.it> <tNzgS-3Gr-17@gated-at.bofh.it> <tNA3g-4do-21@gated-at.bofh.it> <tNAmB-4kR-9@gated-at.bofh.it> <tNAwi-4oP-35@gated-at.bofh.it>
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On Thu 01-06-17 10:47:46, Reza Arbab wrote:
> On Thu, Jun 01, 2017 at 05:38:38PM +0200, Michal Hocko wrote:
> >On Thu 01-06-17 10:19:36, Reza Arbab wrote:
> >>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.
> >
> >Yes but lose that information after the memblock is gone and numa fully
> >initialized. Or can we reconstruct that somehow?
> 
> I'm not sure you'd have to. At boot time, those markings are used to
> determine the initial boundaries of ZONE_MOVABLE. So if you removed these
> memblocks, then readded them, they would still be in ZONE_MOVABLE.

Yes but that already works like that. I am nore interested in the case
when the node goes away and it is added again. echo online > ... would
result in a non-movable memory and that is the inconsistency I tried to
call out in the changelog

-- 
Michal Hocko
SUSE Labs

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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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