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

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Date:	Wed, 17 Sep 2014 14:30:49 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...uxfoundation.org>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.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, Sep 09, 2014 at 03:52:28PM +0100, 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: Johannes Weiner <hannes@...xchg.org>
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