* arm64: why set SECTION_SIZE_BITS to 1G size?
@ 2016-08-11 9:44 ` Xishi Qiu
0 siblings, 0 replies; 4+ messages in thread
From: Xishi Qiu @ 2016-08-11 9:44 UTC (permalink / raw)
To: Catalin Marinas, Will Deacon; +Cc: Linux MM, LKML, chenjie6
Hi everyone:
arm64:
SECTION_SIZE_BITS 30 -----1G
The memory hotplug(add_memory -->check_hotplug_memory_range)
must be aligned with section.So I can not add mem with 64M ...
Can I modify the SECTION_SIZE_BITS to 26?
Thanks,
Xishi Qiu
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* arm64: why set SECTION_SIZE_BITS to 1G size?
@ 2016-08-11 9:44 ` Xishi Qiu
0 siblings, 0 replies; 4+ messages in thread
From: Xishi Qiu @ 2016-08-11 9:44 UTC (permalink / raw)
To: Catalin Marinas, Will Deacon; +Cc: Linux MM, LKML, chenjie6
Hi everyone:
arm64:
SECTION_SIZE_BITS 30 -----1G
The memory hotplug(add_memory -->check_hotplug_memory_range)
must be aligned with section.So I can not add mem with 64M ...
Can I modify the SECTION_SIZE_BITS to 26?
Thanks,
Xishi Qiu
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: arm64: why set SECTION_SIZE_BITS to 1G size?
2016-08-11 9:44 ` Xishi Qiu
@ 2016-08-11 10:07 ` Catalin Marinas
-1 siblings, 0 replies; 4+ messages in thread
From: Catalin Marinas @ 2016-08-11 10:07 UTC (permalink / raw)
To: Xishi Qiu; +Cc: Will Deacon, Linux MM, LKML, chenjie6
On Thu, Aug 11, 2016 at 05:44:46PM +0800, Xishi Qiu wrote:
> arm64:
> SECTION_SIZE_BITS 30 -----1G
>
> The memory hotplug(add_memory -->check_hotplug_memory_range)
> must be aligned with section.So I can not add mem with 64M ...
> Can I modify the SECTION_SIZE_BITS to 26?
There was a patch to reduce this to 27:
http://lkml.kernel.org/g/1465821119-3384-1-git-send-email-jszhang@marvell.com
Also some discussions in this thread on a different patch:
http://lkml.iu.edu/hypermail/linux/kernel/1604.1/03036.html
Does your system really have such small alignment memory blocks?
--
Catalin
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2016-08-11 9:44 arm64: why set SECTION_SIZE_BITS to 1G size? Xishi Qiu
2016-08-11 9:44 ` Xishi Qiu
2016-08-11 10:07 ` Catalin Marinas
2016-08-11 10:07 ` Catalin Marinas
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