linux-kernel - [PATCH 2/2] arm64/numa: Add NUMA emulation for ARM64

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Date: Tue, 25 Jun 2024 13:58:03 +0100
From: Tvrtko Ursulin <tursulin@...lia.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	kernel-dev@...lia.com,
	Maíra Canal <mcanal@...lia.com>,
	Tvrtko Ursulin <tvrtko.ursulin@...lia.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 2/2] arm64/numa: Add NUMA emulation for ARM64

From: Maíra Canal <mcanal@...lia.com>

Allow selecting NUMA emulation on arm64.

Signed-off-by: Maíra Canal <mcanal@...lia.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@...lia.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: “Rafael J. Wysocki" <rafael@...nel.org>
---
 arch/arm64/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8e80df015bdd..49c1cdc545d3 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1507,6 +1507,16 @@ config NODES_SHIFT
 	  Specify the maximum number of NUMA Nodes available on the target
 	  system.  Increases memory reserved to accommodate various tables.
 
+config NUMA_EMULATION
+	bool "NUMA emulation"
+	depends on NUMA
+	select GENERIC_ARCH_NUMA_EMULATION
+	help
+	  Enable NUMA emulation support. A flat machine will be split into
+	  virtual nodes when booted with "numa=fake=N", where N is the number
+	  of nodes, the system RAM will be split into N equal chunks, and
+	  assigned to each node.
+
 source "kernel/Kconfig.hz"
 
 config ARCH_SPARSEMEM_ENABLE
-- 
2.44.0