tongjingran

煎鱼大大，MADV_FREE 和 MADV_DONTNEED 的定义是不是写反了

The `Skip` function looks like a callback function to judge the file should skip or not. In golang project, package `path/filepath` has a similar type [`WalkFunc`](https://golang.org/pkg/path/filepath/#WalkFunc). `type WalkFunc func(path string,...