On Tue, 30 Jan 2024 at 13:25, Steven Rostedt [off-list ref] wrote:

I actually find the dentry's sticking around when their ref counts go to
zero a feature. Tracing applications will open and close the eventfs files
many times. If the dentry were to be deleted on every close, it would need
to be create over again in short spurts.

Sure. I think this is literally a tuning thing, and we'll see if
anybody ever says "the dentry cache grows too much with tracefs".

               Linus