On 2017年09月15日 19:50, Michal Hocko wrote:
> 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.
>
Could you be more explicit for how to implement it here. Thanks very much.
