linux-kernel - Re: powerpc,numa: Memory hotplug to memory-less nodes ?

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Date:	Wed, 24 Jun 2015 09:31:12 +0530
From:	Bharata B Rao <bharata.rao@...il.com>
To:	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@....ibm.com>
Subject: Re: powerpc,numa: Memory hotplug to memory-less nodes ?

So will it be correct to say that memory hotplug to memory-less node
isn't supported by PowerPC kernel ? Should I enforce the same in QEMU
for PowerKVM ?

On Mon, Jun 22, 2015 at 10:18 AM, Bharata B Rao <bharata.rao@...il.com> wrote:
> Hi,
>
> While developing memory hotplug support in QEMU for PoweKVM, I
> realized that guest kernel has specific checks to prevent hot addition
> of memory to a memory-less node.
>
> I am referring to arch/powerpc/mm/numa.c:hot_add_scn_to_nid() which
> has explicit checks to ensure that it returns a nid that has some some
> memory (NODE_DATA(nid)->node_spanned_pages) even when user wants to
> hotplug to a node that currently has zero memory.
>
> Is this limitation by design ?
>
> Regards,
> Bharata.
> --
> http://raobharata.wordpress.com/



-- 
http://raobharata.wordpress.com/
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