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Date: Fri, 26 May 2017 13:46:58 +1000 From: Michael Ellerman <mpe@...erman.id.au> To: Reza Arbab <arbab@...ux.vnet.ibm.com>, Balbir Singh <bsingharora@...il.com> Cc: Michael Bringmann <mwb@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>, Bharata B Rao <bharata@...ux.vnet.ibm.com>, Shailendra Singh <shailendras@...dia.com>, Thomas Gleixner <tglx@...utronix.de>, linuxppc-dev@...ts.ozlabs.org, Sebastian Andrzej Siewior <bigeasy@...utronix.de> Subject: Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc Reza Arbab <arbab@...ux.vnet.ibm.com> writes: > 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. But does that actually happen on any real system? cheers
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