On Wed, May 03, 2023 at 08:40:07AM -1000, Tejun Heo wrote:

quoted

Yeah, easy / default visibility argument does make sense to me.

So, a bit of addition here. If this is the thrust, the debugfs part seems
rather redundant, right? That's trivially obtainable with tracing / bpf and
in a more flexible and performant manner. Also, are we happy with recording
just single depth for persistent tracking?

Not sure what you're envisioning?

I'd consider the debugfs interface pretty integral; it's much more
discoverable for users, and it's hardly any code out of the whole
patchset.

Single depth was discussed previously. It's what makes it cheap enough
to be always-on (saving stack traces is expensive!), and I find the
output much more usable than e.g. page owner.