linux-kernel - Re: [PATCH] add some drop_caches documentation and info messsge

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Message-ID: <507C183C.2070106@linux.vnet.ibm.com>
Date:	Mon, 15 Oct 2012 07:05:48 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] add some drop_caches documentation and info messsge

On 10/12/2012 05:57 AM, Michal Hocko wrote:
> I would like to resurrect the following Dave's patch. The last time it
> has been posted was here https://lkml.org/lkml/2010/9/16/250 and there
> didn't seem to be any strong opposition. 
> Kosaki was worried about possible excessive logging when somebody drops
> caches too often (but then he claimed he didn't have a strong opinion
> on that) but I would say opposite. If somebody does that then I would
> really like to know that from the log when supporting a system because
> it almost for sure means that there is something fishy going on. It is
> also worth mentioning that only root can write drop caches so this is
> not an flooding attack vector.

Just read through the patch again.  Still looks great to me.

Thanks for bringing it up again, Michal!

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