linux-kernel - Re: [RFC patch] delete improper hot pluggable code of memory affinity

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Date:	Fri, 17 Jul 2009 14:03:18 +0800
From:	Luming Yu <luming.yu@...il.com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC patch] delete improper hot pluggable code of memory affinity

On Fri, Jul 17, 2009 at 1:52 PM, Yasunori Goto<y-goto@...fujitsu.com> wrote:
>> Without a fix like my proposal, I have seen NUMA configure disabled by
>> kernel (due to the code the patch deletes) on a system with Enabled
>> bit set , and Hotplug-able bit cleared, and
>> CONFIG_MEMORY_HOTPLUG_SPARSE disabled.
>
> Ok. I guess that save_add_info() was to check percentage of
> reserve area when CONFIG_MEMORY_HOTPLUG_RESERVE is set.
> Its code was removed at 2.6.25, save_add_info() may be garbage now.
>
> However, I have one question now.
>
>>> -    if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
>>> -            update_nodes_add(node, start, end);
>>> -            /* restore nodes[node] */
>>> -            *nd = oldnode;
>>> -            if ((nd->start | nd->end) == 0)
>>> -                    node_clear(node, nodes_parsed);
>>> -     }
>
> I don't understand why you remove this code. could you tell me why?

Good question. This is exactly the place I'm puzzled too.
Without delete this code, I still see one fake node instead of 4 real node...
I think a flow up patch is needed here...
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