Re: [PATCH 2/3] mm: Handle numa statistics distinctively based-on different VM stats modes

[Michal Hocko]

On Fri 15-09-17 17:23:25, Kemi Wang wrote:
[...]
> @@ -2743,6 +2745,17 @@ static inline void zone_statistics(struct zone *preferred_zone, struct zone *z)
>  #ifdef CONFIG_NUMA
>  	enum numa_stat_item local_stat = NUMA_LOCAL;
>  
> +	/*
> +	 * skip zone_statistics() if vmstat is a coarse mode or zone statistics
> +	 * is inactive in auto vmstat mode
> +	 */
> +
> +	if (vmstat_mode) {
> +		if (vmstat_mode == VMSTAT_COARSE_MODE)
> +			return;
> +	} else if (disable_zone_statistics)
> +		return;
> +
>  	if (z->node != numa_node_id())
>  		local_stat = NUMA_OTHER;

A jump label could make this completely out of the way for the case
where every single cycle matters.
-- 
Michal Hocko
SUSE Labs