linux-kernel - Re: [PATCH 4/4] memory_hotplug: use pgdat_resize_lock() when updating node_present

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Message-ID: <51819C54.3030704@linux.vnet.ibm.com>
Date:	Wed, 01 May 2013 15:51:00 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] memory_hotplug: use pgdat_resize_lock() when updating
 node_present_pages

On 05/01/2013 03:48 PM, David Rientjes wrote:
> On Wed, 1 May 2013, Cody P Schafer wrote:
>
>> Guaranteed to be stable means that if I'm a reader and pgdat_resize_lock(),
>> node_present_pages had better not change at all until I pgdat_resize_unlock().
>>
>> If nothing needs this guarantee, we should change the rules of
>> pgdat_resize_lock(). I played it safe and went with following the existing
>> rules.
>>
>
> __offline_pages() breaks your guarantee.
>

Thanks for pointing that out. Seems I fixed online_pages() but missed 
__offline_pages().

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