Re: [PATCH] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512

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To: Eric Mackay <eric.mackay@xxxxxxxxxx>
Subject: Re: [PATCH] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512
From: "Christoph Lameter (Ampere)" <cl@xxxxxxxxx>
Date: Wed, 17 Jan 2024 11:59:53 -0800 (PST)
Cc: mark.rutland@xxxxxxx, Jonathan.Cameron@xxxxxxxxxx, Matteo.Carlini@xxxxxxx, Valentin.Schneider@xxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, anshuman.khandual@xxxxxxx, catalin.marinas@xxxxxxx, dave.kleikamp@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux@xxxxxxxxxxxxxxx, robin.murphy@xxxxxxx, vanshikonda@xxxxxxxxxxxxxxxxxxxxxx, yang@xxxxxxxxxxxxxxxxxxxxxx
In-reply-to: <20240116210633.116278-1-eric.mackay@oracle.com>
References: <ZaZ_xK5QHVPSD7N6@FVFF77S0Q05N> <20240116210633.116278-1-eric.mackay@oracle.com>

On Tue, 16 Jan 2024, Eric Mackay wrote:


It seems > 256 was chosen as the cutoff simply because it preserves existing behavior.
The patch description seems to imply there was pushback from distro maintainers on just increasing
the default NR_CPUS.


Yup that was it.

References:
- Re: [PATCH] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512
  - From: Mark Rutland
- Re: [PATCH] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512
  - From: Eric Mackay

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