Re: [PATCH v3] mm: add thp_utilization metrics to /proc/thp_utilization

[Alex Zhu (Kernel)]

> 
> Out of curiosity, do you have any statistics on how much of a performance impact scanning may have?
> 
> We've reached the point where we've finally been able to show previous admonitions to not enable THP due to a negative performance impact no longer hold true, and I'd hate to see systems on which enabling THP now would cause a performance hit due to this scanner.

There are no noticeable performance issues from running the scanner itself from our experiments. As written, we check 256 pfn s at a time every second, which does not appear to be an issue.