linux-kernel - Re: [PATCH 0/3] memory-hotplug: improve rezoning capability

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Message-Id: <20160509131158.d5429d4dba4a24c5b1aac9ca@linux-foundation.org>
Date:	Mon, 9 May 2016 13:11:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Reza Arbab <arbab@...ux.vnet.ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Tang Chen <tangchen@...fujitsu.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	David Vrabel <david.vrabel@...rix.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Banman <abanman@....com>,
	Chen Yucong <slaoub@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Zhen <zhenzhang.zhang@...wei.com>,
	Shaohua Li <shaohua.li@...el.com>
Subject: Re: [PATCH 0/3] memory-hotplug: improve rezoning capability

On Mon,  9 May 2016 12:53:36 -0500 Reza Arbab <arbab@...ux.vnet.ibm.com> wrote:

> While it is currently possible to rezone memory when it is onlined, there are
> implicit assumptions about the zones:
> 
> * To "online_kernel" a block into ZONE_NORMAL, it must currently
>   be in ZONE_MOVABLE.
> 
> * To "online_movable" a block into ZONE_MOVABLE, it must currently
>   be in (ZONE_MOVABLE - 1).
> 
> So on powerpc, where new memory is hotplugged into ZONE_DMA, these operations
> do not work.
> 
> This patchset replaces the qualifications above with a more general
> validation of zone movement.
> 

The patches look good from a first scan.  It's late for 4.6 so I'll
queue them for 4.7-rc1, unless there are convincing reasons otherwise?

Hopefully the other memory-hotplug developers will be able to find time
to review these.