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Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

From Balbir Singh <bsingharora@gmail.com>
Newsgroups linux.kernel
Subject Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc
Date 2017-05-26 05:50 +0200
Message-ID <tLeqd-Ek-5@gated-at.bofh.it> (permalink)
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On Thu, 25 May 2017 10:10:11 -0500
Reza Arbab <arbab@linux.vnet.ibm.com> wrote:

> On Thu, May 25, 2017 at 04:19:53PM +1000, Michael Ellerman wrote:
> >The commit message for 3af229f2071f says:
> >
> >    In practice, we never see a system with 256 NUMA nodes, and in fact, we
> >    do not support node hotplug on power in the first place, so the nodes
> >    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >    that are online when we come up are the nodes that will be present for
> >    the lifetime of this kernel.
> >
> >Is that no longer true?  
> 
> I don't know what the reasoning behind that statement was at the time, 
> but as far as I can tell, the only thing missing for node hotplug now is 
> Balbir's patchset [1]. He fixes the resource issue which motivated 
> 3af229f2071f and reverts it.
> 
> With that set, I can instantiate a new numa node just by doing 
> add_memory(nid, ...) where nid doesn't currently exist.
> 
> [1] https://lkml.kernel.org/r/1479253501-26261-1-git-send-email-bsingharora@gmail.com
> 

I guess I should try and revive that patchset. One of the suggestions of
then was to limit maximum possible nodes in firmware, but I'm double checking
to see if we can do that in a well defined manner.

Balbir Singh

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Thread

Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-05-25 02:00 +0200
  Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-05-25 08:30 +0200
    Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-05-25 15:50 +0200
    Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-05-25 17:20 +0200
      Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-05-25 17:30 +0200
      Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Balbir Singh <bsingharora@gmail.com> - 2017-05-26 05:50 +0200
      Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-05-26 05:50 +0200
        Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-05-26 14:40 +0200
        Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-05-26 16:40 +0200
          Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-05-29 07:40 +0200
            Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-05-31 16:10 +0200
              Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-06-01 11:40 +0200
                Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Reza Arbab <arbab@linux.vnet.ibm.com> - 2017-06-01 23:40 +0200
                Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Balbir Singh <bsingharora@gmail.com> - 2017-06-07 10:10 +0200
                Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-06-07 14:10 +0200
                Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-06-06 11:50 +0200
                Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-06-06 18:20 +0200
                Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Michael Ellerman <mpe@ellerman.id.au> - 2017-06-07 14:10 +0200

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