linux-kernel - Re: [PATCH v3 00/26] mm: introduce numa

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Message-ID: <66b135659ad15_c14482941a@dwillia2-xfh.jf.intel.com.notmuch>
Date: Mon, 5 Aug 2024 13:26:13 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Dan Williams <dan.j.williams@...el.com>, Mike Rapoport <rppt@...nel.org>,
	<linux-kernel@...r.kernel.org>
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Subject: Re: [PATCH v3 00/26] mm: introduce numa_memblks

Dan Williams wrote:
> Mike Rapoport wrote:
> > From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> > 
> > Hi,
> > 
> > Following the discussion about handling of CXL fixed memory windows on
> > arm64 [1] I decided to bite the bullet and move numa_memblks from x86 to
> > the generic code so they will be available on arm64/riscv and maybe on
> > loongarch sometime later.
> > 
> > While it could be possible to use memblock to describe CXL memory windows,
> > it currently lacks notion of unpopulated memory ranges and numa_memblks
> > does implement this.
> > 
> > Another reason to make numa_memblks generic is that both arch_numa (arm64
> > and riscv) and loongarch use trimmed copy of x86 code although there is no
> > fundamental reason why the same code cannot be used on all these platforms.
> > Having numa_memblks in mm/ will make it's interaction with ACPI and FDT
> > more consistent and I believe will reduce maintenance burden.
> > 
> > And with generic numa_memblks it is (almost) straightforward to enable NUMA
> > emulation on arm64 and riscv.
> 
> Hey Mike,
> 
> So interesting to see this come full circle and instead of moving
> numa_memblks to memblock, just uplevel numa_memblks. From the
> perspective of having numa_memblks enhancements work for more
> architectures this gets an enthusiastic thumbs up from me. Let me go
> look at the details...

For the series you can add:

Acked-by: Dan Williams <dan.j.williams@...el.com>