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

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Date:   Tue, 10 Mar 2020 23:31:38 -0700
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 and All,

Any chance you have time to take a look.

Thanks and regards
Hoan

On 2/25/20 3:20 PM, Hoan Tran wrote:
> 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
>>>