Re: [PATCH] mm/vmstat: don't do count if no needs

[Alex Shi]

在 2020/7/21 上午7:14, Andrew Morton 写道:
>> --- a/mm/vmstat.c
>> +++ b/mm/vmstat.c
>> @@ -321,6 +321,9 @@ void __mod_zone_page_state(struct zone *zone, enum 
>> zone_stat_item item,
>>      long x;
>>      long t;
>>  
>> +    if (unlikely(!delta))
>> +            return;
>> +
> Do we know that delta==0 is frequent enough to make the change a net
> benefit?

Uh,I check again. it seems no much place delta==0, forget this patch.

Thanks
Alex