linux-kernel - Re: [PATCH] mm: prevent divide error for small values of vm_dirty

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Message-ID: <alpine.DEB.2.00.0904290224260.31490@chino.kir.corp.google.com>
Date:	Wed, 29 Apr 2009 02:26:11 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrea Righi <righi.andrea@...il.com>
cc:	akpm@...ux-foundation.org, Peter Zijlstra <peterz@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: prevent divide error for small values of
 vm_dirty_bytes

On Wed, 29 Apr 2009, Andrea Righi wrote:

> Avoid to set less than two pages for vm_dirty_byte: this is necessary to avoid
> potential division by 0 (like the following) in get_dirty_limits().
> 

Where exactly is the divide by 0 in get_dirty_limits()?

Is this because we forced the background threshold to be half of the dirty 
threshold when its setting is greater?
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