linux-kernel - Re: [RFC] mm: Honor min_free

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Date:	Mon, 08 Jul 2013 14:48:02 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Joe Perches <joe@...ches.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] mm: Honor min_free_kbytes set by user

> Checkpatch fixes
> ---
>  From 5f089c0b2a57ff6c08710ac9698d65aede06079f Mon Sep 17 00:00:00 2001
> From: Michal Hocko <mhocko@...e.cz>
> Date: Thu, 4 Jul 2013 17:15:54 +0200
> Subject: [PATCH] mm: Honor min_free_kbytes set by user
>
> min_free_kbytes is updated during memory hotplug (by init_per_zone_wmark_min)
> currently which is right thing to do in most cases but this could be
> unexpected if admin increased the value to prevent from allocation
> failures and the new min_free_kbytes would be decreased as a result of
> memory hotadd.
>
> This patch saves the user defined value and allows updating
> min_free_kbytes only if it is higher than the saved one.
>
> A warning is printed when the new value is ignored.
>
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

Thank you. I have similar patch and I have been bothered long time to
refine and post it.
Yes, current logic is not memory hotplug aware and could be dangerous.

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>






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