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
next prev parent 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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