linux-kernel - Re: [PATCH v3 02/14] mm, tracing: make show_gfp

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Date:	Thu, 7 Jan 2016 10:29:00 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	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 v3 02/14] mm, tracing: make show_gfp_flags() up to date

On Fri 18-12-15 10:03:14, Vlastimil Babka wrote:
> The show_gfp_flags() macro provides human-friendly printing of gfp flags in
> tracepoints. However, it is somewhat out of date and missing several flags.
> This patches fills in the missing flags, and distinguishes properly between
> GFP_ATOMIC and __GFP_ATOMIC which were both translated to "GFP_ATOMIC".
> 
> Also add a note in gfp.h so hopefully future changes will be synced better.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Sasha Levin <sasha.levin@...cle.com>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Michal Hocko <mhocko@...e.cz>

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

> ---
>  include/linux/gfp.h             | 5 +++++
>  include/trace/events/gfpflags.h | 9 +++++++--
>  2 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index 91f74e741aa2..6ffee7f93af7 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -9,6 +9,11 @@
>  
>  struct vm_area_struct;
>  
> +/*
> + * In case of changes, please don't forget to update
> + * include/trace/events/gfpflags.h
> + */
> +
>  /* Plain integer GFP bitmasks. Do not use this directly. */
>  #define ___GFP_DMA		0x01u
>  #define ___GFP_HIGHMEM		0x02u
> diff --git a/include/trace/events/gfpflags.h b/include/trace/events/gfpflags.h
> index dde6bf092c8a..8395798d97b0 100644
> --- a/include/trace/events/gfpflags.h
> +++ b/include/trace/events/gfpflags.h
> @@ -19,9 +19,13 @@
>  	{(unsigned long)GFP_NOFS,		"GFP_NOFS"},		\
>  	{(unsigned long)GFP_ATOMIC,		"GFP_ATOMIC"},		\
>  	{(unsigned long)GFP_NOIO,		"GFP_NOIO"},		\
> +	{(unsigned long)GFP_NOWAIT,		"GFP_NOWAIT"},		\
> +	{(unsigned long)__GFP_DMA,		"GFP_DMA"},		\
> +	{(unsigned long)__GFP_DMA32,		"GFP_DMA32"},		\
>  	{(unsigned long)__GFP_HIGH,		"GFP_HIGH"},		\
> -	{(unsigned long)__GFP_ATOMIC,		"GFP_ATOMIC"},		\
> +	{(unsigned long)__GFP_ATOMIC,		"__GFP_ATOMIC"},	\
>  	{(unsigned long)__GFP_IO,		"GFP_IO"},		\
> +	{(unsigned long)__GFP_FS,		"GFP_FS"},		\
>  	{(unsigned long)__GFP_COLD,		"GFP_COLD"},		\
>  	{(unsigned long)__GFP_NOWARN,		"GFP_NOWARN"},		\
>  	{(unsigned long)__GFP_REPEAT,		"GFP_REPEAT"},		\
> @@ -36,8 +40,9 @@
>  	{(unsigned long)__GFP_RECLAIMABLE,	"GFP_RECLAIMABLE"},	\
>  	{(unsigned long)__GFP_MOVABLE,		"GFP_MOVABLE"},		\
>  	{(unsigned long)__GFP_NOTRACK,		"GFP_NOTRACK"},		\
> +	{(unsigned long)__GFP_WRITE,		"GFP_WRITE"},		\
>  	{(unsigned long)__GFP_DIRECT_RECLAIM,	"GFP_DIRECT_RECLAIM"},	\
>  	{(unsigned long)__GFP_KSWAPD_RECLAIM,	"GFP_KSWAPD_RECLAIM"},	\
>  	{(unsigned long)__GFP_OTHER_NODE,	"GFP_OTHER_NODE"}	\
> -	) : "GFP_NOWAIT"
> +	) : "none"
>  
> -- 
> 2.6.3

-- 
Michal Hocko
SUSE Labs
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