linux-kernel - Re: [PATCH part5 0/7] Arrange hotpluggable memory as ZONE

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Date:	Tue, 13 Aug 2013 10:38:56 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	Tang Chen <imtangchen@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
	robert.moore@...el.com, lv.zheng@...el.com, rjw@...k.pl,
	lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	akpm@...ux-foundation.org, trenn@...e.de, yinghai@...nel.org,
	jiang.liu@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org,
	"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>
Subject: Re: [PATCH part5 0/7] Arrange hotpluggable memory as ZONE_MOVABLE.

Hello, Tang.

On Tue, Aug 13, 2013 at 05:56:46PM +0800, Tang Chen wrote:
> 1. Introduce a memblock.current_limit_low to limit the lowest address
>    that memblock can use.
> 
> 2. Make memblock be able to allocate memory from low to high.
> 
> 3. Get kernel image address on x86, and set memblock.current_limit_low
>    to it before SRAT is parsed. Then we achieve the goal.
> 
> 4. Reset it to 0, and make memblock allocate memory form high to low.
> 
> How do you think of this, or do you have any better idea ?

Yes, something like that.  Maybe have something like
memblock_set_alloc_range(low, high, low_to_high) in memblock?  Once
NUMA info is available arch code can call memblock_set_alloc_range(0,
0, false) to reset it to the default behavior.

> Thanks for your patient and help. :)

Heh, sorry about all the roundabouts.  Your persistence is much
appreciated. :)

-- 
tejun
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