linux-kernel - Re: [PATCH 05/17] arch, mm: pull out allocation of NODE

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Message-ID: <ZpuQRgmrp-4deiur@kernel.org>
Date: Sat, 20 Jul 2024 13:24:06 +0300
From: Mike Rapoport <rppt@...nel.org>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	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>,
	Dan Williams <dan.j.williams@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"David S. Miller" <davem@...emloft.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>,
	Michael Ellerman <mpe@...erman.id.au>,
	Palmer Dabbelt <palmer@...belt.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vasily Gorbik <gor@...ux.ibm.com>, Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
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	nvdimm@...ts.linux.dev, devicetree@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Subject: Re: [PATCH 05/17] arch, mm: pull out allocation of NODE_DATA to
 generic code

On Wed, Jul 17, 2024 at 04:42:48PM +0200, David Hildenbrand wrote:
> On 16.07.24 13:13, Mike Rapoport wrote:
> > From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> > 
> > Architectures that support NUMA duplicate the code that allocates
> > NODE_DATA on the node-local memory with slight variations in reporting
> > of the addresses where the memory was allocated.
> > 
> > Use x86 version as the basis for the generic alloc_node_data() function
> > and call this function in architecture specific numa initialization.
> > 
> > Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> > ---
> 
> [...]
> 
> > diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
> > index 9208eaadf690..909f6cec3a26 100644
> > --- a/arch/mips/loongson64/numa.c
> > +++ b/arch/mips/loongson64/numa.c
> > @@ -81,12 +81,8 @@ static void __init init_topology_matrix(void)
> >   static void __init node_mem_init(unsigned int node)
> >   {
> > -	struct pglist_data *nd;
> >   	unsigned long node_addrspace_offset;
> >   	unsigned long start_pfn, end_pfn;
> > -	unsigned long nd_pa;
> > -	int tnid;
> > -	const size_t nd_size = roundup(sizeof(pg_data_t), SMP_CACHE_BYTES);
> 
> One interesting change is that we now always round up to full pages on
> architectures where we previously rounded up to SMP_CACHE_BYTES.

I did some git archaeology and it seems that round up to full pages on x86
backdates to bootmem era when allocation granularity was PAGE_SIZE anyway.
I'm going to change that to SMP_CACHE_BYTES in v2.
 
> I assume we don't really expect a significant growth in memory consumption
> that we care about, especially because most systems with many nodes also
> have  quite some memory around.

-- 
Sincerely yours,
Mike.