linux-kernel - Re: [RFC] restore user defined min_free

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Message-ID: <20140121102351.GD4963@suse.de>
Date:	Tue, 21 Jan 2014 10:23:51 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Dave Hansen <dave.hansen@...el.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [RFC] restore user defined min_free_kbytes when disabling thp

On Tue, Jan 21, 2014 at 05:38:59PM +0800, Han Pingtian wrote:
> The testcase 'thp04' of LTP will enable THP, do some testing, then
> disable it if it wasn't enabled. But this will leave a different value
> of min_free_kbytes if it has been set by admin. So I think it's better
> to restore the user defined value after disabling THP.
> 

Then have LTP record what min_free_kbytes was at the same time THP was
enabled by the test and restore both settings. It leaves a window where
an admin can set an alternative value during the test but that would also
invalidate the test in same cases and gets filed under "don't do that".

-- 
Mel Gorman
SUSE Labs
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