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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAGZKiBpWtPKLR+P_gQ8LguS7p4sZt4EvyNqCW_7t8NovGmNpPg@mail.gmail.com>
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/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/