linux-kernel - Re: [PATCH 3/3] mm/page_alloc: Fix typo in debug info of calculate_node

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Date:   Fri, 4 May 2018 15:18:54 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Huaisheng Ye <yehs1@...ovo.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org, vbabka@...e.cz,
        mgorman@...hsingularity.net, pasha.tatashin@...cle.com,
        alexander.levin@...izon.com, hannes@...xchg.org,
        penguin-kernel@...ove.SAKURA.ne.jp, colyli@...e.de,
        chengnt@...ovo.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm/page_alloc: Fix typo in debug info of
 calculate_node_totalpages

On Fri 04-05-18 14:52:09, Huaisheng Ye wrote:
> realtotalpages is calculated by taking off absent_pages from
> spanned_pages in every zone.
> Debug message of calculate_node_totalpages shall accurately
> indicate that it is real totalpages to avoid ambiguity.

Is the printk actually useful? Why don't we simply remove it? You can
get the information from /proc/zoneinfo so why to litter the dmesg
output?

> Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
> ---
>  mm/page_alloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 1b39db4..9d57db2 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5967,7 +5967,7 @@ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
>  
>  	pgdat->node_spanned_pages = totalpages;
>  	pgdat->node_present_pages = realtotalpages;
> -	printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id,
> +	printk(KERN_DEBUG "On node %d realtotalpages: %lu\n", pgdat->node_id,
>  							realtotalpages);
>  }
>  
> -- 
> 1.8.3.1
> 

-- 
Michal Hocko
SUSE Labs