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

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Message-Id: <20090429144655.e60fdf7a.akpm@linux-foundation.org>
Date:	Wed, 29 Apr 2009 14:46:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	peterz@...radead.org, rientjes@...gle.com, david@...morbit.com,
	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 11:34:51 +0200
Andrea Righi <righi.andrea@...il.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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