linux-kernel - Re: [PATCH 01/14] mm: Serialize access to min_free

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Message-Id: <20110706164447.d571051a.akpm@linux-foundation.org>
Date:	Wed, 6 Jul 2011 16:44:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 01/14] mm: Serialize access to min_free_kbytes

On Mon, 20 Jun 2011 14:12:07 +0100
Mel Gorman <mgorman@...e.de> wrote:

> There is a race between the min_free_kbytes sysctl, memory hotplug
> and transparent hugepage support enablement.  Memory hotplug uses a
> zonelists_mutex to avoid a race when building zonelists. Reuse it to
> serialise watermark updates.

This patch appears to be a standalone fix, unrelated to the overall
patch series?

How does one trigger the race and what happens when it hits, btw?
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