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* [PATCH] arm64: mm: decrease the section size to reduce the memory reserved for the page map
@ 2020-12-04  1:44 ` Wei Li
  0 siblings, 0 replies; 28+ messages in thread
From: Wei Li @ 2020-12-04  1:44 UTC (permalink / raw)
  To: catalin.marinas, rppt, will, liwei213
  Cc: fengbaopeng2, nsaenzjulienne, steve.capper, song.bao.hua,
	linux-arm-kernel, linux-kernel, butao

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


^ permalink raw reply related	[flat|nested] 28+ messages in thread

end of thread, other threads:[~2020-12-07 12:09 UTC | newest]

Thread overview: 28+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-04  1:44 [PATCH] arm64: mm: decrease the section size to reduce the memory reserved for the page map Wei Li
2020-12-04  1:44 ` Wei Li
2020-12-04  1:50 ` Song Bao Hua (Barry Song)
2020-12-04  1:50   ` Song Bao Hua (Barry Song)
2020-12-04 11:13 ` Will Deacon
2020-12-04 11:13   ` Will Deacon
2020-12-04 11:44   ` Mike Rapoport
2020-12-04 11:44     ` Mike Rapoport
2020-12-07  1:40     ` Song Bao Hua (Barry Song)
2020-12-07  1:40       ` Song Bao Hua (Barry Song)
2020-12-07  7:30       ` Anshuman Khandual
2020-12-07  7:30         ` Anshuman Khandual
2020-12-07  7:47         ` Song Bao Hua (Barry Song)
2020-12-07  7:47           ` Song Bao Hua (Barry Song)
2020-12-07  9:09   ` Ard Biesheuvel
2020-12-07  9:09     ` Ard Biesheuvel
2020-12-07  9:35     ` Marc Zyngier
2020-12-07  9:35       ` Marc Zyngier
2020-12-07  9:42       ` Mike Rapoport
2020-12-07  9:42         ` Mike Rapoport
2020-12-07  9:49         ` Ard Biesheuvel
2020-12-07  9:49           ` Ard Biesheuvel
2020-12-07 10:04           ` Mike Rapoport
2020-12-07 10:04             ` Mike Rapoport
2020-12-07 10:39             ` Anshuman Khandual
2020-12-07 10:39               ` Anshuman Khandual
2020-12-07 12:07               ` Wei Li
2020-12-07 12:07                 ` Wei Li

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