linux-kernel - Re: [PATCH] hugetlbfs: correct handling of negative input to /proc/sys/vm/nr

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Message-Id: <20110223161818.9876cc10.akpm@linux-foundation.org>
Date:	Wed, 23 Feb 2011 16:18:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Petr Holasek <pholasek@...hat.com>, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Wu Fengguang <fengguang.wu@...el.com>, linux-mm@...ck.org
Subject: Re: [PATCH] hugetlbfs: correct handling of negative input to
 /proc/sys/vm/nr_hugepages

On Tue, 22 Feb 2011 10:02:36 +0000
Mel Gorman <mel@....ul.ie> wrote:

> On Mon, Feb 21, 2011 at 04:47:49PM +0100, Petr Holasek wrote:
> > When user insert negative value into /proc/sys/vm/nr_hugepages it will result
> > in the setting a random number of HugePages in system (can be easily showed
> > at /proc/meminfo output).
> 
> I bet you a shiny penny that the value of HugePages becomes the maximum
> number that could be allocated by the system at the time rather than a
> random value.

That seems to be the case from my reading.  In which case the patch
removes probably-undocumented and possibly-useful existing behavior.

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