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

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Date:   Tue, 25 Feb 2020 15:20:59 -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,

Do you have any comments?

Thanks
Hoan

On 2/6/20 12:01 PM, Hoan Tran wrote:
> 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
>>