linux-kernel - Re: [PATCH 18/21] x86, numa: Synchronize nid info in memblock.reserve with numa

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Message-ID: <20130725150554.GC26107@mtj.dyndns.org>
Date:	Thu, 25 Jul 2013 11:05:54 -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 18/21] x86, numa: Synchronize nid info in
 memblock.reserve with numa_meminfo.

Hello, Tang.

On Thu, Jul 25, 2013 at 12:09:29PM +0800, Tang Chen wrote:
> And as in [patch 14/21], when reserving hotpluggable memory, we use
> pxm. So my

Which is kinda nasty.

> idea was to do a nid sync in numa_init(). After this, memblock will
> set nid when
> it allocates memory.

Sure, that's the only place we can set the numa node IDs but my point
is that you don't need to add another interface.  Jet let
memblock_set_node() handle both memblock.memory and .reserved ranges.
That way, you can make memblock simpler to use and less error-prone.

> If we want to let memblock_set_node() and alloc functions set nid on
> the reserved
> regions, we should setup nid <-> pxm mapping when we parst SRAT for
> the first time.

I don't follow why it has to be different.  Why do you need to do
anything differently?  What am I missing here?

Thanks.

-- 
tejun
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