linux-kernel - Re: arm64: why set SECTION_SIZE

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Date:	Thu, 11 Aug 2016 11:07:32 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Xishi Qiu <qiuxishi@...wei.com>
Cc:	Will Deacon <will.deacon@....com>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, chenjie6@...wei.com
Subject: Re: arm64: why set SECTION_SIZE_BITS to 1G size?

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