linux-kernel - Re: [PATCH v2] memory-hotplug: add sysfs zones_online

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Message-ID: <alpine.DEB.2.02.1408181447260.4796@chino.kir.corp.google.com>
Date:	Mon, 18 Aug 2014 14:48:16 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Zhang Zhen <zhenzhang.zhang@...wei.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>, toshi.kani@...com,
	isimatu.yasuaki@...fujitsu.com, n-horiguchi@...jp.nec.com,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2] memory-hotplug: add sysfs zones_online_to attribute

On Wed, 13 Aug 2014, Zhang Zhen wrote:

> Currently memory-hotplug has two limits:
> 1. If the memory block is in ZONE_NORMAL, you can change it to
> ZONE_MOVABLE, but this memory block must be adjacent to ZONE_MOVABLE.
> 2. If the memory block is in ZONE_MOVABLE, you can change it to
> ZONE_NORMAL, but this memory block must be adjacent to ZONE_NORMAL.
> 
> With this patch, we can easy to know a memory block can be onlined to
> which zone, and don't need to know the above two limits.
> 
> Updated the related Documentation.
> 
> Change v1 -> v2:
> - optimize the implementation following Dave Hansen's suggestion
> 
> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>

linux-next build failure:

drivers/built-in.o: In function `show_zones_online_to':
memory.c:(.text+0x13ee09): undefined reference to `test_pages_in_a_zone'
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