linux-kernel - Re: [PATCH] mm: alloc_contig_range: demote pages busy message from warn to info

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Date:	Tue, 4 Nov 2014 14:43:07 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Peter Hurley <peter@...leysoftware.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: alloc_contig_range: demote pages busy message from
 warn to info

Hello,

On Mon, Nov 03, 2014 at 05:57:53PM +0100, Michal Nazarewicz wrote:
> Having test_pages_isolated failure message as a warning confuses
> users into thinking that it is more serious than it really is.  In
> reality, if called via CMA, allocation will be retried so a single
> test_pages_isolated failure does not prevent allocation from
> succeeding.
> 
> Demote the warning message to an info message and reformat it such
> that the text “failed” does not appear and instead a less worrying
> “PFNS busy” is used.

What do you expect from this message? Please describe it so that we can
review below message helps your goal.

> 
> Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
> ---
>  mm/page_alloc.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 372e3f3..e2731eb 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6431,13 +6431,12 @@ int alloc_contig_range(unsigned long start, unsigned long end,
>  
>  	/* Make sure the range is really isolated. */
>  	if (test_pages_isolated(outer_start, end, false)) {
> -		pr_warn("alloc_contig_range test_pages_isolated(%lx, %lx) failed\n",
> -		       outer_start, end);
> +		pr_info("%s: [%lx, %lx) PFNs busy\n",
> +			__func__, outer_start, end);
>  		ret = -EBUSY;
>  		goto done;
>  	}
>  
> -
>  	/* Grab isolated pages from freelists. */
>  	outer_end = isolate_freepages_range(&cc, outer_start, end);
>  	if (!outer_end) {
> -- 
> 2.1.0.rc2.206.gedb03e5
> 
> --
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-- 
Kind regards,
Minchan Kim
--
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