linux-kernel - Re: [PATCH v3 19/26] mm: introduce numa

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Message-ID: <454177d0-d315-42dd-bec4-4dd0d2b7868d@redhat.com>
Date: Tue, 6 Aug 2024 15:18:19 +0200
From: David Hildenbrand <david@...hat.com>
To: Dan Williams <dan.j.williams@...el.com>, Mike Rapoport <rppt@...nel.org>,
 linux-kernel@...r.kernel.org
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
 Andreas Larsson <andreas@...sler.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>,
 Borislav Petkov <bp@...en8.de>, Catalin Marinas <catalin.marinas@....com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 "David S. Miller" <davem@...emloft.net>, Davidlohr Bueso
 <dave@...olabs.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Heiko Carstens <hca@...ux.ibm.com>, Huacai Chen <chenhuacai@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Jiaxun Yang <jiaxun.yang@...goat.com>,
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
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 <rafael@...nel.org>, Rob Herring <robh@...nel.org>,
 Samuel Holland <samuel.holland@...ive.com>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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 Will Deacon <will@...nel.org>, Zi Yan <ziy@...dia.com>,
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Subject: Re: [PATCH v3 19/26] mm: introduce numa_emulation

On 05.08.24 22:09, Dan Williams wrote:
> Mike Rapoport wrote:
>> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
>>
>> Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c
> 
> s/codfrom/code from/
> 
> I am surprised that numa-emulation stayed x86 only for so long. I think
> it is useful facility for debugging NUMA scaling and heterogenous memory
> topologies. So, glad to see it upleveled.

I recall that s390x had NUMA emulation at some point (primarily to have 
multiple kthreads be responsible for different physical memory ranges), 
but it got removed a while ago.

-- 
Cheers,

David / dhildenb