linux-kernel - Re: [RFC] mm: show message when updating min_free

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Message-ID: <52C5AA61.8060701@intel.com>
Date:	Thu, 02 Jan 2014 10:05:21 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	linux-kernel@...r.kernel.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [RFC] mm: show message when updating min_free_kbytes in thp

On 12/31/2013 04:29 PM, Han Pingtian wrote:
> min_free_kbytes may be updated during thp's initialization. Sometimes,
> this will change the value being set by user. Showing message will
> clarify this confusion.
...
> -	if (recommended_min > min_free_kbytes)
> +	if (recommended_min > min_free_kbytes) {
>  		min_free_kbytes = recommended_min;
> +		pr_info("min_free_kbytes is updated to %d by enabling transparent hugepage.\n",
> +			min_free_kbytes);
> +	}

"updated" doesn't tell us much.  It's also kinda nasty that if we enable
then disable THP, we end up with an elevated min_free_kbytes.  Maybe we
should at least put something in that tells the user how to get back
where they were if they care:

"raising min_free_kbytes from %d to %d to help transparent hugepage
allocations"


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