linux-kernel - Re: [PATCH 3/3] mm: print information when THP is disabled automatically

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Message-ID: <20110620165425.GF20843@redhat.com>
Date:	Mon, 20 Jun 2011 18:54:25 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/3] mm: print information when THP is disabled
 automatically

On Tue, Jun 21, 2011 at 12:34:30AM +0800, Amerigo Wang wrote:
> Print information when THP is disabled automatically so that
> users can find this info in dmesg.
> 
> Signed-off-by: WANG Cong <amwang@...hat.com>
> ---
>  mm/huge_memory.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 7fb44cc..07679da 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -544,8 +544,11 @@ static int __init hugepage_init(void)
>  	 * where the extra memory used could hurt more than TLB overhead
>  	 * is likely to save.  The admin can still enable it through /sys.
>  	 */
> -	if (totalram_pages < (CONFIG_TRANSPARENT_HUGEPAGE_THRESHOLD << (20 - PAGE_SHIFT)))
> +	if (totalram_pages < (CONFIG_TRANSPARENT_HUGEPAGE_THRESHOLD
> +					<< (20 - PAGE_SHIFT))) {
> +		printk(KERN_INFO "hugepage: disabled auotmatically\n");

typo automatically. I'd suggest to change the prefix from "hugepage:"
to "THP:" to avoid the risk of possible confusion with hugetlbfs
support. Maybe you could print the minimal threshold too ("disabled
automatically with less than %dMB of RAM").
--
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