linux-kernel - Re: [PATCHv21 10/16] mm: Serialize access to min_free

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Message-Id: <20120214173821.8a214716.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 14 Feb 2012 17:38:21 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	Michal Nazarewicz <mina86@...a86.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Walker <dwalker@...eaurora.org>,
	Mel Gorman <mel@....ul.ie>, Arnd Bergmann <arnd@...db.de>,
	Jesse Barker <jesse.barker@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	Shariq Hasnain <shariq.hasnain@...aro.org>,
	Chunsang Jeong <chunsang.jeong@...aro.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	Rob Clark <rob.clark@...aro.org>,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: Re: [PATCHv21 10/16] mm: Serialize access to min_free_kbytes

On Fri, 10 Feb 2012 18:32:25 +0100
Marek Szyprowski <m.szyprowski@...sung.com> wrote:

> From: Mel Gorman <mgorman@...e.de>
> 
> 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.
> 
> [a.p.zijlstra@...llo.nl: Older patch fixed the race with spinlock]
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>

At linux-next, conflicted with "mm: add extra free kbytes tunable"

To the logic,
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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