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From: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
To: akpm@linux-foundation.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Cc: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
Subject: [PATCH 1/1] arm64: make section size configurable for memory hotplug
Date: Tue,  5 Jan 2021 17:28:46 -0800	[thread overview]
Message-ID: <66f79b0c06602c22df4da8ff4a5c2b97c9275250.1609895500.git.sudaraja@codeaurora.org> (raw)
In-Reply-To: <cover.1609895500.git.sudaraja@codeaurora.org>

Currently on arm64, memory section size is hard-coded to 1GB.
Make this configurable if memory-hotplug is enabled, to support
more finer granularity for hotplug-able memory.

Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
---
 arch/arm64/Kconfig                 | 11 +++++++++++
 arch/arm64/include/asm/sparsemem.h |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6d232837cbee..34124eee65da 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -294,6 +294,17 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
 config SMP
 	def_bool y
 
+config HOTPLUG_SIZE_BITS
+	int "Memory hotplug block size(29 => 512MB 30 => 1GB)"
+	depends on SPARSEMEM
+	depends on MEMORY_HOTPLUG
+	range 28 30
+	default 30
+	help
+	 Selects granularity of hotplug memory. Block size for
+	 memory hotplug is represent as a power of 2.
+	 If unsure, stick with default value.
+
 config KERNEL_MODE_NEON
 	def_bool y
 
diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
index 1f43fcc79738..3d5310f3aad5 100644
--- a/arch/arm64/include/asm/sparsemem.h
+++ b/arch/arm64/include/asm/sparsemem.h
@@ -7,7 +7,11 @@
 
 #ifdef CONFIG_SPARSEMEM
 #define MAX_PHYSMEM_BITS	CONFIG_ARM64_PA_BITS
+#ifndef CONFIG_MEMORY_HOTPLUG
 #define SECTION_SIZE_BITS	30
+#else
+#define SECTION_SIZE_BITS	CONFIG_HOTPLUG_SIZE_BITS
+#endif
 #endif
 
 #endif
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project


  reply	other threads:[~2021-01-06  1:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-06  1:28 [PATCH 0/1] arm64: make section size configurable for memory hotplug Sudarshan Rajagopalan
2021-01-06  1:28 ` Sudarshan Rajagopalan [this message]
2021-01-06  2:20   ` [PATCH 1/1] " Randy Dunlap
2021-01-06  6:11   ` Anshuman Khandual
2021-01-07 12:30     ` David Hildenbrand
2021-01-08  7:02       ` Anshuman Khandual
2021-01-08 15:30         ` David Hildenbrand
2021-01-11  4:17           ` Anshuman Khandual
2021-01-11 10:13             ` David Hildenbrand
2021-01-11 10:26               ` Anshuman Khandual
2021-01-08  1:01     ` Sudarshan Rajagopalan

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