linux-kernel - Re: [PATCH 17/21] page_alloc, mem-hotplug: Improve movablecore to {en|dis}able using SRAT.

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Message-ID: <20130725150913.GD26107@mtj.dyndns.org>
Date:	Thu, 25 Jul 2013 11:09:13 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	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
Subject: Re: [PATCH 17/21] page_alloc, mem-hotplug: Improve movablecore to
 {en|dis}able using SRAT.

Hello, Tang.

On Thu, Jul 25, 2013 at 11:50:12AM +0800, Tang Chen wrote:
> movablecore boot option was used to specify the size of ZONE_MOVABLE. And
> this patch-set aims to arrange ZONE_MOVABLE with SRAT info. So my original
> thinking is to reuse movablecore.
> 
> Since you said above, I think we have two problems here:
> 1. Should not let users care about where the hotplug info comes from.
> 2. Should not distinguish movable node and memory hotplug, since for now,
>    to use memory hotplug is to use movable node.
> 
> So how about something like "movablenode", just like "quiet" boot option.
> If users specify "movablenode", then memblock will reserve hotpluggable
> memory, and create movable nodes if any. If users specify nothing, then
> the kernel acts as before.

Maybe I'm confused but memory hotplug isn't likely to work without
this, right?  If so, wouldn't it make more sense to have
"memory_hotplug" option rather than "movablecore=acpi" which in no way
indicates that it has something to do with memory hotplug?

Thanks.

-- 
tejun
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