[Devel] Re: [PATCH v4 05/14] Add a __GFP_KMEMCG flag

[Michal Hocko]

On Mon 08-10-12 14:06:11, Glauber Costa wrote:
> This flag is used to indicate to the callees that this allocation is a
> kernel allocation in process context, and should be accounted to
> current's memcg. It takes numerical place of the of the recently removed
> __GFP_NO_KSWAPD.
> 
> [ v4: make flag unconditional, also declare it in trace code ]
> 
> Signed-off-by: Glauber Costa <glommer at parallels.com>
> CC: Christoph Lameter <cl at linux.com>
> CC: Pekka Enberg <penberg at cs.helsinki.fi>
> CC: Michal Hocko <mhocko at suse.cz>
> CC: Suleiman Souhlal <suleiman at google.com>
> Acked-by: Johannes Weiner <hannes at cmpxchg.org>
> Acked-by: Rik van Riel <riel at redhat.com>
> Acked-by: Mel Gorman <mel at csn.ul.ie>
> Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>

Acked-by: Michal Hocko <mhocko at suse.cz>

> ---
>  include/linux/gfp.h             | 3 ++-
>  include/trace/events/gfpflags.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index 02c1c97..9289d46 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -31,6 +31,7 @@ struct vm_area_struct;
>  #define ___GFP_THISNODE		0x40000u
>  #define ___GFP_RECLAIMABLE	0x80000u
>  #define ___GFP_NOTRACK		0x200000u
> +#define ___GFP_KMEMCG		0x400000u
>  #define ___GFP_OTHER_NODE	0x800000u
>  #define ___GFP_WRITE		0x1000000u
>  
> @@ -87,7 +88,7 @@ struct vm_area_struct;
>  
>  #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
>  #define __GFP_WRITE	((__force gfp_t)___GFP_WRITE)	/* Allocator intends to dirty page */
> -
> +#define __GFP_KMEMCG	((__force gfp_t)___GFP_KMEMCG) /* Allocation comes from a memcg-accounted resource */
>  /*
>   * This may seem redundant, but it's a way of annotating false positives vs.
>   * allocations that simply cannot be supported (e.g. page tables).
> diff --git a/include/trace/events/gfpflags.h b/include/trace/events/gfpflags.h
> index 9391706..730df12 100644
> --- a/include/trace/events/gfpflags.h
> +++ b/include/trace/events/gfpflags.h
> @@ -36,6 +36,7 @@
>  	{(unsigned long)__GFP_RECLAIMABLE,	"GFP_RECLAIMABLE"},	\
>  	{(unsigned long)__GFP_MOVABLE,		"GFP_MOVABLE"},		\
>  	{(unsigned long)__GFP_NOTRACK,		"GFP_NOTRACK"},		\
> +	{(unsigned long)__GFP_KMEMCG,		"GFP_KMEMCG"},		\
>  	{(unsigned long)__GFP_OTHER_NODE,	"GFP_OTHER_NODE"}	\
>  	) : "GFP_NOWAIT"
>  
> -- 
> 1.7.11.4
> 
> --
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-- 
Michal Hocko
SUSE Labs