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

[kemi]

On 2017å09æ15æ 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.