小弟我也来个愚的有关问题

我也来个愚的问题
static void update_avg(u64 *avg, u64 sample)
{
s64 diff = sample - *avg;
*avg += diff >> 3;
}

*avg += diff >> 3;为什么呢？？


[解决办法]
什么为什么， 楼主说清楚噻
[解决办法]