From: Wei Li <liwei213@huawei.com>
To: <catalin.marinas@arm.com>, <rppt@linux.ibm.com>,
<will@kernel.org>, <liwei213@huawei.com>
Cc: song.bao.hua@hisilicon.com, steve.capper@arm.com,
linux-kernel@vger.kernel.org, nsaenzjulienne@suse.de,
fengbaopeng2@hisilicon.com, linux-arm-kernel@lists.infradead.org,
butao@hisilicon.com
Subject: [PATCH] arm64: mm: decrease the section size to reduce the memory reserved for the page map
Date: Fri, 4 Dec 2020 09:44:43 +0800 [thread overview]
Message-ID: <20201204014443.43329-1-liwei213@huawei.com> (raw)
For the memory hole, sparse memory model that define SPARSEMEM_VMEMMAP
do not free the reserved memory for the page map, decrease the section
size can reduce the waste of reserved memory.
Signed-off-by: Wei Li <liwei213@huawei.com>
Signed-off-by: Baopeng Feng <fengbaopeng2@hisilicon.com>
Signed-off-by: Xia Qing <saberlily.xia@hisilicon.com>
---
arch/arm64/include/asm/sparsemem.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
index 1f43fcc79738..8963bd3def28 100644
--- a/arch/arm64/include/asm/sparsemem.h
+++ b/arch/arm64/include/asm/sparsemem.h
@@ -7,7 +7,7 @@
#ifdef CONFIG_SPARSEMEM
#define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS
-#define SECTION_SIZE_BITS 30
+#define SECTION_SIZE_BITS 27
#endif
#endif
--
2.15.0
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next reply other threads:[~2020-12-04 1:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-04 1:44 Wei Li [this message]
2020-12-04 1:50 ` [PATCH] arm64: mm: decrease the section size to reduce the memory reserved for the page map Song Bao Hua (Barry Song)
2020-12-04 11:13 ` Will Deacon
2020-12-04 11:44 ` Mike Rapoport
2020-12-07 1:40 ` Song Bao Hua (Barry Song)
2020-12-07 7:30 ` Anshuman Khandual
2020-12-07 7:47 ` Song Bao Hua (Barry Song)
2020-12-07 9:09 ` Ard Biesheuvel
2020-12-07 9:35 ` Marc Zyngier
2020-12-07 9:42 ` Mike Rapoport
2020-12-07 9:49 ` Ard Biesheuvel
2020-12-07 10:04 ` Mike Rapoport
2020-12-07 10:39 ` Anshuman Khandual
2020-12-07 12:07 ` Wei Li
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