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

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Message-ID: <alpine.DEB.2.02.1305011547450.8804@chino.kir.corp.google.com>
Date:	Wed, 1 May 2013 15:48:05 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Cody P Schafer <cody@...ux.vnet.ibm.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 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.
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