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

[William Kucharski]

(My apologies if you've seen this twice, I'm having mailer issues today.)

> On Aug 5, 2022, at 12:40, alexlzhu@xxxxxx wrote:
> 
> From: Alexander Zhu <alexlzhu@xxxxxx>
> 
> This change introduces a tool that scans through all of physical
> memory for anonymous THPs and groups them into buckets based
> on utilization.

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.