linux-kernel - Re: [PATCH v2 8/9] mm, page_alloc: print symbolic gfp

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Message-ID: <20151125143355.GK27283@dhcp22.suse.cz>
Date:	Wed, 25 Nov 2015 15:33:55 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Minchan Kim <minchan@...nel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH v2 8/9] mm, page_alloc: print symbolic gfp_flags on
 allocation failure

On Tue 24-11-15 13:36:20, Vlastimil Babka wrote:
> It would be useful to translate gfp_flags into string representation when
> printing in case of an allocation failure, especially as the flags have been
> undergoing some changes recently and the script ./scripts/gfp-translate needs
> a matching source version to be accurate.
> 
> Example output:
> 
> stapio: page allocation failure: order:9, mode:0x2080020(GFP_ATOMIC)

I like this _very much_

> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

If this can be done with a printk formatter it would be even nicer but
this is good enough for the OOM purpose.

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/page_alloc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f806a1a..80349ac 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -2711,9 +2711,9 @@ void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...)
>  		va_end(args);
>  	}
>  
> -	pr_warn("%s: page allocation failure: order:%u, mode:0x%x\n",
> +	pr_warn("%s: page allocation failure: order:%u, mode:0x%x",
>  		current->comm, order, gfp_mask);
> -
> +	dump_gfpflag_names(gfp_mask);
>  	dump_stack();
>  	if (!should_suppress_show_mem())
>  		show_mem(filter);
> -- 
> 2.6.3

-- 
Michal Hocko
SUSE Labs
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