linux-kernel - Re: [PATCH] arm64: Kconfig: Enable NODES_SPAN_OTHER

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Message-ID: <c85dbc06-a72b-9c98-fe41-b25069114b2f@os.amperecomputing.com>
Date:   Thu, 6 Feb 2020 12:01:19 -0800
From:   Hoan Tran <hoan@...amperecomputing.com>
To:     Will Deacon <will@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        patches@...amperecomputing.com
Subject: Re: [PATCH] arm64: Kconfig: Enable NODES_SPAN_OTHER_NODES config for
 NUMA

Hi Will,

On 2/6/20 2:23 AM, Will Deacon wrote:
> On Mon, Feb 03, 2020 at 11:55:14AM -0800, Hoan Tran wrote:
>> Some NUMA nodes have memory ranges that span other nodes.
>> Even though a pfn is valid and between a node's start and end pfns,
>> it may not reside on that node.
>>
>> This patch enables NODES_SPAN_OTHER_NODES config for NUMA to support
>> this type of NUMA layout.
>>
>> Signed-off-by: Hoan Tran <Hoan@...amperecomputing.com>
>> ---
>>   arch/arm64/Kconfig | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index e688dfa..939d28f 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -959,6 +959,13 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK
>>   config HOLES_IN_ZONE
>>   	def_bool y
>>   
>> +# Some NUMA nodes have memory ranges that span other nodes.
>> +# Even though a pfn is valid and between a node's start and end pfns,
>> +# it may not reside on that node.
>> +config NODES_SPAN_OTHER_NODES
>> +	def_bool y
>> +	depends on ACPI_NUMA
>> +
> 
> I thought we agreed to do this in the core code?
> 
> https://lore.kernel.org/lkml/1562887528-5896-1-git-send-email-Hoan@os.amperecomputing.com

Yes, but it looks like Thomas didn't agree to apply this patch into x86.

https://lore.kernel.org/lkml/alpine.DEB.2.21.1907152042110.1767@nanos.tec.linutronix.de/

Regards
Hoan

> 
> Will
>