linux-kernel - Re: [PATCH] mm: page_alloc: Make paranoid check in move_freepages a VM_BUG

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Message-ID: <alpine.DEB.2.02.1409101202400.27173@chino.kir.corp.google.com>
Date:	Wed, 10 Sep 2014 12:02:53 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mgorman@...e.de>
cc:	Andrew Morton <akpm@...uxfoundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: page_alloc: Make paranoid check in move_freepages
 a VM_BUG_ON

On Tue, 9 Sep 2014, Mel Gorman wrote:

> Since 2.6.24 there has been a paranoid check in move_freepages that looks
> up the zone of two pages. This is a very slow path and the only time I've
> seen this bug trigger recently is when memory initialisation was broken
> during patch development. Despite the fact it's a slow path, this patch
> converts the check to a VM_BUG_ON anyway as it is served its purpose by now.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: David Rientjes <rientjes@...gle.com>
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