Date: Wed, 29 Apr 2009 14:46:55 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Andrea Righi <righi.andrea@gmail.com>
Cc: peterz@infradead.org, rientjes@google.com, david@fromorbit.com,
       cl@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: prevent divide error for small values of
 vm_dirty_bytes
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On Wed, 29 Apr 2009 11:34:51 +0200
Andrea Righi <righi.andrea@gmail.com> wrote:

> --- a/Documentation/sysctl/vm.txt
> +++ b/Documentation/sysctl/vm.txt
> @@ -90,6 +90,10 @@ will itself start writeback.
>  If dirty_bytes is written, dirty_ratio becomes a function of its value
>  (dirty_bytes / the amount of dirtyable system memory).
>  
> +Note: the minimum value allowed for dirty_bytes is two pages (in bytes); any
> +value lower than this limit will be ignored and the old configuration will be
> +retained.

Well.  This implies that the write to the procfs file would appear to
succeed.  One hopes that the write would in fact return -EINVAL or
such?
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