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

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